Artykuły w czasopismach na temat „Remnant vegetation”
Kliknij ten link, aby zobaczyć inne rodzaje publikacji na ten temat: Remnant vegetation.
Utwórz poprawne odniesienie w stylach APA, MLA, Chicago, Harvard i wielu innych
Sprawdź 50 najlepszych artykułów w czasopismach naukowych na temat „Remnant vegetation”.
Przycisk „Dodaj do bibliografii” jest dostępny obok każdej pracy w bibliografii. Użyj go – a my automatycznie utworzymy odniesienie bibliograficzne do wybranej pracy w stylu cytowania, którego potrzebujesz: APA, MLA, Harvard, Chicago, Vancouver itp.
Możesz również pobrać pełny tekst publikacji naukowej w formacie „.pdf” i przeczytać adnotację do pracy online, jeśli odpowiednie parametry są dostępne w metadanych.
Przeglądaj artykuły w czasopismach z różnych dziedzin i twórz odpowiednie bibliografie.
1
Keir, Anita F., Richard G. Pearson i Robert A. Congdon. "Determinants of bird assemblage composition in riparian vegetation on sugarcane farms in the Queensland Wet Tropics". Pacific Conservation Biology 21, nr 1 (2015): 60. http://dx.doi.org/10.1071/pc14904.
Pełny tekst źródłaStreszczenie:
Remnant habitat patches in agricultural landscapes can contribute substantially to wildlife conservation. Understanding the main habitat variables that influence wildlife is important if these remnants are to be appropriately managed. We investigated relationships between the bird assemblages and characteristics of remnant riparian forest at 27 sites among sugarcane fields in the Queensland Wet Tropics bioregion. Sites within the remnant riparian zone had distinctly different bird assemblages from those of the forest, but provided habitat for many forest and generalist species. Width of the riparian vegetation and distance from source forest were the most important factors in explaining the bird assemblages in these remnant ribbons of vegetation. Gradual changes in assemblage composition occurred with increasing distance from source forest, with species of rainforest and dense vegetation being replaced by species of more open habitats, although increasing distance was confounded by decreasing riparian width. Species richness increased with width of the riparian zone, with high richness at the wide sites due to a mixture of open-habitat species typical of narrower sites and rainforest species typical of sites within intact forest, as a result of the greater similarity in vegetation characteristics between wide sites and the forest proper. The results demonstrate the habitat value for birds of remnant riparian vegetation in an agricultural landscape, supporting edge and open vegetation species with even narrow widths, but requiring substantial width (>90 m) to support specialists of the closed forest, the dominant original vegetation of the area.
2
Leach, GJ, i HF Recher. "Use of roadside remnants of softwood scrub vegetation by birds in south-eastern Queensland". Wildlife Research 20, nr 2 (1993): 233. http://dx.doi.org/10.1071/wr9930233.
Pełny tekst źródłaStreszczenie:
Birds in roadside and remnant patches of vegetation in the Marburg district of south-eastern Queensland were studied from November 1989 to February 1990. Effects of the length, width and height of the tree, shrub and herb layers, and their major components, on the bird community were determined. In all, 43 species of birds were observed in roadside vegetation; 16 of these were abundant and widely distributed. Silvereyes were most frequently observed (240 observations), followed by superb fairy-wrens (59), yellow thornbills (53), double-barred finches (26), red-backed fairy-wrens (25) and Lewin's honeyeaters (20). Apart from silvereyes (20-654 of observations), and superb fairy-wrens on two roads (12 and 13%) and yellow thornbills on one (15%), no other species constituted more than 10% of observations on any road. In all, 48 species of birds were observed in remnant patches of vegetation, 14 in all of them. Rates of detection in remnant patches ranged from 2.7 to 5.3 birds per 5 min compared with a mean maximum rate for roadside vegetation of 1.3. The richness of the roadside avifauna increased significantly (P=0.001) as the volume (length x width x height) of the tree component, especially the softwood species, increased. The diversity of tree species in softwood remnants and the greater canopy density appear to be important factors that enhance the bird community. The number of birds was also correlated (P=0.05) with the volume of brigalow, Acacia harpophylla. The correlation of the volume of woody weeddshrubs with the number of birds was low (P=0.05), and with the number of species not significant, even though woody weeds were a major component of roadside vegetation. Although supporting fewer birds than remnant patches of vegetation, roadside vegetation contributes importantly to conservation of the avifauna in the Marburg district. Some simple management practices, such as maintaining a minimum width of undisturbed vegetation and retaining vegetation diversity, would ensure or enhance the long-term conservation benefits. Opportunities to regenerate softwood remnants could also be taken, particularly to enhance the value, and possibly prolong the life, of the associated remnants of brigalow.
3
Martin, Tara G., i Carla P. Catterall. "Do fragmented coastal heathlands have habitat value to birds in eastern Australia?" Wildlife Research 28, nr 1 (2001): 17. http://dx.doi.org/10.1071/wr99096.
Pełny tekst źródłaStreszczenie:
This study investigated the effects of habitat clearance and fragmentation on birds of coastal heathlands in subtropical eastern Australia. Abundance and species composition were compared among two types of cleared habitat (residential suburbs and sugar cane cropland) and four sizes of heathland remnant (1–2 ha, 5–10 ha, 20–50 ha and >500 ha) in summer and winter. Cleared land contained a distinctly different bird species assemblage from heathland remnants. Residential sites contained a distinct suite of species consistent with that described for ‘open/developed land’ habitat elsewhere in the region. In contrast, cane cropland supported very few species. Heathland remnants >500 ha contained high densities of ‘natural-vegetation-dependent’ species, whereas species of open/developed land were absent. Remnants of 1–2 ha had lowered densities of many natural-vegetation-dependent species, and a relatively high abundance of open/developed land species. Some of the avifaunal differences in the >500-ha remnants and 5–50-ha range are probably due to confounding of remnant size with habitat, resulting from selective clearing of the landscape. Most of the heathland birds were intolerant of the matrix habitat (residential and cane cropland), but tolerant of decreased remnant area, down to a threshold of about 5 ha. However, the distinctive floristic associations of heathland vegetation are dependent on an environmental regime (low nutrient, low pH, fire, in some cases inundation) that is unlikely to persist in remnants tens of hectares in size, and longer-term declines in heathland birds, are predicted.
4
W. Arnold, G., i J. R. Weeldenburg. "The effects of isolation, habitat fragmentation and degradation by livestock grazing on the use by birds of patches of Gimlet Eucalyptus salubris woodland in the wheatbelt of Western Australia". Pacific Conservation Biology 4, nr 2 (1998): 155. http://dx.doi.org/10.1071/pc980155.
Pełny tekst źródłaStreszczenie:
The numbers of species, and the frequency of occurrence of individual species, in patches of Gimlet Eucalyptus salubris woodland in remnants of native vegetation in the central wheatbelt of Western Australia were recorded over a year. These values were examined in relation to the structural characteristics of the patches and the biogeographic attributes of the remnants (i.e., size and various indices of isolation from other native vegetation). There were five patches in large remnants (>100 ha) and 24 patches in small remnants (0.5?27.0 ha). Most of the small remnants were grazed by livestock and had lost much or all of the shrub understorey. The Galah Cacatua roseicapilla and Port Lincoln Ringnecked Parrot Platycercus zonarius were found in all patches, but the remaining large species of birds (Australian Raven Corvus coronoides,Pied Butcherbird Cracticus nigroregularis, Crested Pigeon Ocyphaps lophotes, and Yellow-throated Miner Manorina flavigula) were found more frequently in patches in small remnants. Conversely, with the exception of the Striated Pardalote Pardalotus striatus, small passerine species were found less frequently in patches in small remnants. Remnant size was significantly negatively correlated with frequency of occurrence of six of the eight common large species, indicating that these species concentrated in patches in small remnants, and significantly positively correlated with frequency of occurrence of two of four small passerine species. Having taken out the effect of remnant area, a stepwise regression procedure was used to see whether other biogeographic attributes of the remnants or habitat structure in the patches influenced the frequency of occurrence of individual species and species richness. As area of native vegetation within a 5 km radius increased so did the frequency of occurrence of the Galah and Port Lincoln Parrot, indicating that local numbers of the species affects their presence. Of the large birds only the Yellowthroated Miner was influenced by patch structural attributes whereas all species of small passerines showed responses to various structural attributes of the patches. Frequency of occurrence of the Striated Pardalote and the number of species of small passerines in a patch decreased with increasing distance to the nearest native vegatation. Overall frequency of occurence of small passerines increased with the number of linear strips of native vegetation linked to a remnant. In this study a majority of the small remnants were too small to support resident birds. The Gimlet patches, if used, would be part of a home range. Loss of the shrub understorey through grazing and loss of canopy cover through tree deaths had a significant impact on numbers of species of small passerines using the Gimlet patches. The conservation value of the patches in small remnants would be enhanced by increasing remnant size and by the linking of remnants to nearby native vegetation.
5
Brown, Stephen C. "Remnant seed banks and vegetation as predictors of restored marsh vegetation". Canadian Journal of Botany 76, nr 4 (1.04.1998): 620–29. http://dx.doi.org/10.1139/b98-038.
Pełny tekst źródłaStreszczenie:
Selection of sites for wetland restoration requires analysis of probable success at recreating diverse natural vegetation. We studied the seed banks and the remnant vegetation at restoration sites to determine their degree of similarity to the vegetation that developed following restoration of wetland hydrology. The study sites had been used for forage crops and pasture following long-term drainage. The seed bank was a very poor predictor of plant species abundances following restoration. Similarity between remnant vegetation and restored vegetation was consistently higher than similarity values using seed banks at both restored and natural wetlands. Our results suggest that seed-bank analysis is an inefficient technique for predicting restored vegetation in sites with prolonged disturbance, and that analysis of remnant vegetation on the sites is probably more useful. However, results would probably differ at sites with tile drainage that have limited remnant vegetation or created wetlands with bare soil where seed germination would play a greater role in revegetation. In addition, seed-bank studies are important to determine if aggressive invasive species are present at potential restoration sites.Key words: seed banks, wetlands, restoration, marshes, vegetation.
6
O'Loughlin, Thea, Luke S. O'Loughlin, Damian R. Michael, Jeffrey T. Wood, Helen P. Waudby, Phillip Falcke i David B. Lindenmayer. "The importance of travelling stock reserves for maintaining high-quality threatened temperate woodlands". Australian Journal of Botany 65, nr 7 (2017): 507. http://dx.doi.org/10.1071/bt17114.
Pełny tekst źródłaStreszczenie:
Travelling stock reserves (TSRs) are thought to represent some of the highest-quality and least degraded remnants of threatened temperate woodland in south-eastern Australia. These public reserves have not had the same high levels of grazing pressure and other disturbances as woodland remnants on private land. Thus, TSRs are expected to be important for the protection of biodiversity in heavily cleared and modified landscapes. We tested the hypothesis that land tenure had significant effects on the quality of woodlands by comparing vegetation structural attributes between TSRs and remnant vegetation used for primary production purposes. Vegetation attributes were monitored in 155 permanent plots over 5 years in remnant temperate woodland sites in the Riverina bioregion of New South Wales. Overall, TSRs supported higher native plant species richness and were characterised by higher ground cover of native shrubs and less cover of exotic plant species than agricultural production areas. We found land tenure had significant effects on some vegetation attributes demonstrated to be important for threatened fauna. We attribute these results to TSRs having a history of lower grazing pressure compared with remnants managed for agricultural production. Our study provides empirical evidence to support the high conservation value of TSRs in formerly woodland-dominated, but now extensively cleared agricultural landscapes.
7
Fitzimons, James A., Mark J. Antos i Grant C. Palmer. "When more is less: Urban remnants support high bird abundance but diversity varies". Pacific Conservation Biology 17, nr 2 (2011): 97. http://dx.doi.org/10.1071/pc110097.
Pełny tekst źródłaStreszczenie:
Urban remnant vegetation, especially where it occurs in public parks, allows for relatively easy access for ongoing biodiversity monitoring. However, relatively little baseline information on bird species distribution and abundance across a range of identifiable urban remnants appears in the published literature. We surveyed the relative abundance and distribution of birds across urban and suburban remnant vegetation in Melbourne, Australia. One hundred and six species were recorded, of which 98 were indigenous. Red wattlebirds had the highest mean relative abundance with 2.94 birds/ ha, followed by rainbow lorikeets (2.51), noisy miners (1.93), brown thornbills (1.75) and spotted doves (0.96). There was no obvious trend between overall relative abundance and the size of the remnant, in contrast to species richness which was positively correlated with remnant size. The data revealed that some species were either totally restricted to, or more abundant in, larger remnants and generally absent from smaller remnants. Some of the more common birds (crimson rosella, superb fairy-wren, spotted pardalote and black-faced cuckoo-shrike) recorded during this study were detected at similar densities to those found in comparable vegetation to the east of Melbourne within a largely forested landscape. Other species occurred at much lower densities (e.g., white-browed scrubwren, brown thornbill, eastern yellow robin and grey fantail) or had habitat requirements or ecological characteristics that could place them at risk of further decline or local extinction in the urban area. We identify a suite of bird species of potential conservation concern within Melbourne’s urban landscape. The establishment of repeatable, fixed-point, and long-term monitoring sites will allow for repeat surveying over time and provide an early warning of population declines, or conversely an indication of population increase for other species.
8
Martin, Warren K., David Eldridge i Patricia A. Murray. "Bird assemblages in remnant and revegetated habitats in an extensively cleared landscape, Wagga Wagga, New South Wales." Pacific Conservation Biology 17, nr 2 (2011): 110. http://dx.doi.org/10.1071/pc110110.
Pełny tekst źródłaStreszczenie:
Extensive loss and degradation of native vegetation in the agricultural landscape of inland south-eastern Australia has resulted in significant losses in bird diversity and abundance. Native vegetation continues to be lost through the attrition of paddock trees, which constitute a large component of the remaining vegetation. The planting of native trees and shrubs is being undertaken as a means of halting the loss of biodiversity. However, the effectiveness of revegetation activities is still being assessed. A study in the Wagga Wagga area of New South Wales was undertaken to examine the relative value of remnant vegetation, farm plantings, paddock trees, and pasture for bird diversity. Species richness was highest in remnant vegetation, and was similar in planted vegetation and paddock trees. Relative abundance was similar across these three vegetation types. Species composition differed among all vegetation types, with planted and paddock tree sites having predominantly different sub-sets of the bird assemblage characteristic of remnant vegetation. The protection of remnant vegetation is essential for the conservation of the region’s avifauna, but plantings and paddock trees also have important values for birds. However, plantings and paddock trees support different bird assemblages and complement each other. While important in their own right, the current plantings of native vegetation should not be considered as off-setting the continued loss of paddock trees. Retention of the avifauna of the Wagga Wagga area would be assisted if remnant vegetation and paddock trees were protected and integrated with appropriately designed revegetation.
9
ANTOS, MARK J., JAMES A. FITZSIMONS, GRANT C. PALMER i JOHN G. WHITE. "Introduced birds in urban remnant vegetation: Does remnant size really matter?" Austral Ecology 31, nr 2 (kwiecień 2006): 254–61. http://dx.doi.org/10.1111/j.1442-9993.2006.01572.x.
Pełny tekst źródła
10
C. Walpole, S. "Assessment of the economic and ecological impacts of remnant vegetation on pasture productivity". Pacific Conservation Biology 5, nr 1 (1999): 28. http://dx.doi.org/10.1071/pc990028.
Pełny tekst źródłaStreszczenie:
The decline of remnant native vegetation in Australia is a national concern, with mounting community pressure on private landholders to actively manage and conserve the remaining vegetation on their properties. One of the major concerns of landholders in retaining and managing remnant vegetation in the agricultural landscape is the lack of information and understanding about the costs and benefits potentially associated with remnant vegetation, and how these values are linked to ecological functions. This paper focuses on the impacts of remnant vegetation on pasture productivity. Knowledge of the economic impacts of remnant vegetation on pasture productivity and associated agricultural output is currently limited, while the ecological relationships are better known but may vary with species and environment. Based on a study area near Gunnedah in northern New South Wales where farm survey data and GIS information were available, a model that incorporates agricultural and biophysical attributes to explain pasture productivity was developed. The results indicate that the value of pasture output per farm may be increased by having a certain proportion of pasture area under dry sclerophyll or woodland vegetation. Gross value of pasture output was at its highest level when the proportion of tree area across the farm was at 34%, with no further increases in output being achieved beyond this point. These results suggest that the competitive influences of trees present in the pasture system may begin to outweigh the stimulatory effects when this proportion of tree area is exceeded.
11
Brooker, Michael, i Lesley Brooker. "Breeding biology, reproductive success and survival of blue-breasted fairy-wrens in fragmented habitat in the Western Australian wheatbelt". Wildlife Research 28, nr 2 (2001): 205. http://dx.doi.org/10.1071/wr00012.
Pełny tekst źródłaStreszczenie:
We studied blue-breasted fairy-wrens, Malurus pulcherrimus, over a 6-year period in 17 differently sized remnants in a highly fragmented agricultural landscape at Wyalkatchem, Western Australia. The wrens lived in groups of 2–5 adults, comprising one breeding female, her consort and up to three helpers (usually adult male offspring). Groups lived in permanent year-round territories averaging 2.2 ha. Data from 536 nests indicated that breeding extends from August to December in good seasons but from August to October in years of drought. Overall, the average clutch size was 2.91 (median 3), although in the driest year of the study it was 2.31 (median 2). Individual nest success was low, with a mean of 1.02 fledglings produced per clutch. However, the wrens made 1.87 nesting attempts per year, thereby raising the annual reproductive output to 1.63 fledglings per group and 0.49 potential breeders per group. There was a positive relationship between nest predation and remnant size and no difference in the predation rate of nests in the largest remnant depending on how far they were located from the edge of the remnant. Nest parasitism by Horsfield"s bronze-cuckoo, Chrysococcyx basalis, was also positively related to remnant size. Consequently, annual reproductive success was higher in the 13 small remnants (2.16 fledglings per group per year), compared with 3 medium-sized remnants (1.94) and the largest remnant (1.32). Annual adult survival was 63.9% for breeding females and 67.2% for senior males. Survival was positively related to remnant size for adults, but not for fledglings. The annual survival of adults in small remnants was 54.5%, compared with 64.9% in medium-sized remnants and 68.6% in the largest remnant. It is suggested that, in order to conserve sedentary species living in fragmented habitats, we should try to retain the whole range of patch sizes that remain, even if some (or most) of the vegetation mosaic has been removed and even if some remnants are extremely small.
12
Smith, Rhiannon, Julian Reid, Laura Scott-Morales, Stuart Green i Nick Reid. "A baseline survey of birds in native vegetation on cotton farms in inland eastern Australia". Wildlife Research 46, nr 4 (2019): 304. http://dx.doi.org/10.1071/wr18038.
Pełny tekst źródłaStreszczenie:
Context The Australian cotton industry has committed to (1) understanding the biodiversity value of remnant native vegetation on cotton farms, (2) funding independent, evidence-based assessments of the industry’s sustainability and environmental performance, and (3) investing in research that reports against recognised sustainability indicators. Aims The present study reports the results of an industry-wide survey to benchmark bird diversity in native vegetation on cotton farms spanning a 1260-km north–south subcontinental gradient from Central Queensland (Qld) to Southern New South Wales (NSW). Methods Between September and November 2014, birds were sampled twice on separate days in 2-ha quadrats (20 min per census) in eight remnant vegetation types as well as in native revegetation at 197 sites on 60 cotton farms spread across the principal cotton-growing zones (Central Qld, Border Rivers, Macquarie and Southern NSW) in inland eastern Australia. Key results We recorded 185 bird species in remnant and planted native vegetation on cotton farms. Species richness of bird communities declined from north to south. Bird community composition was similar in the three southern zones, differing somewhat in the north. The most frequent species were large (>60 g), readily detected landbirds common in agricultural districts, but 26 of the 53 extant species of conservation concern in the study region were also recorded, including 16 species of declining woodland birds. Bird composition, abundance, richness and diversity differed among the nine native vegetation types, with maximal and minimal bird abundance and diversity metrics recorded in river red gum-dominated riparian vegetation and grassland respectively. Conclusions Each remnant vegetation community had a generally distinct bird assemblage, indicating that all vegetation types contribute to regional biodiversity in cotton-growing zones in inland eastern Australia. Appropriate on-farm management of all remnant and planted native vegetation will assist regional biodiversity conservation. Implications For the Australian cotton industry to meet its stated environmental responsibilities, growers should be encouraged to prioritise the conservation management of remnant, riparian and planted native vegetation on cotton farms and the monitoring of bird species as an indicator of regional biodiversity response.
13
Lockwood, Michael, i Sandra Walpole. "Economic Assessment of Remnant Native Vegetation Conservation". Australasian Journal of Environmental Management 7, nr 4 (styczeń 2000): 237–45. http://dx.doi.org/10.1080/14486563.2000.10648505.
Pełny tekst źródła
14
Brown, Stephen C. "Remnant seed banks and vegetation as predictors of restored marsh vegetation". Canadian Journal of Botany 76, nr 4 (1998): 620–29. http://dx.doi.org/10.1139/cjb-76-4-620.
Pełny tekst źródła
15
Hodgson, P., K. French i R. E. Major. "Comparison of foraging behaviour of small, urban-sensitive insectivores in continuous woodland and woodland remnants in a suburban landscape". Wildlife Research 33, nr 7 (2006): 591. http://dx.doi.org/10.1071/wr05017.
Pełny tekst źródłaStreszczenie:
Small patches of remnant vegetation are often considered to have low conservation value. In urban landscapes their value may potentially be higher than in other landscapes because they can be the only representatives of original native vegetation. Despite this potential, many small insectivorous birds that rely on native vegetation demonstrate sensitivities within urban landscapes through reduced numbers or total absence. One reason for this sensitivity may be that remnants are of suboptimal quality, which may be reflected in behavioural changes. Using five insectivorous species that were present (in low numbers) in remnants surrounded by high-density housing, foraging behaviour was examined in relation to vegetation. The proportion of time birds spent on different foraging substrates and plant species was compared with that of conspecifics in continuous vegetation. Canopy and shrub foragers showed minimal behavioural changes. Ground foragers in remnants tended to forage at lower heights than those in continuous vegetation; however, these changes did not appear to reflect a negative effect. These changes were partially explained by structural differences between vegetation in remnants and continuous sites. The number of times a bird attacked prey items was significantly higher in continuous habitat for only two species. Overall, the foraging behaviour of small insectivorous birds in remnants surrounded by high-density housing was not adversely affected by urbanisation and it appears that remnants have potential value as habitat and foraging sources in an urban landscape. Despite this, small insectivores are still sensitive to urbanisation, suggesting that other factors, probably in the matrix, are important.
16
Wilson, B. A., V. J. Neldner i A. Accad. "The extent and status of remnant vegetation in Queensland and its implications for statewide vegetation management and legislation". Rangeland Journal 24, nr 1 (2002): 6. http://dx.doi.org/10.1071/rj02001.
Pełny tekst źródłaStreszczenie:
Vegetation classification, survey and mapping provide key information underpinning the implementation of statewide vegetation management legislation and associated policies in Queensland. This paper summarises: (i) the Queensland Herbarium survey and mapping methods and land classification system and its role in vegetation management legislation; and, (ii) the current extent and rate of vegetation clearing by bioregion, sub-region and Broad Vegetation Group; (iii) and the amount of vegetation protected under legislated statewide bioregional and regional ecosystem thresholds. Information also is provided on the pre-clearing and current extent by 18 Broad Vegetation Groups and the area of non-remnant woody vegetation by bioregion. The implications for vegetation management are discussed, along with a comparison of clearing statistics derived from other studies that use different classification and mapping methodologies. The majority of Queensland has relatively continuous native vegetation cover (82% remnant native vegetation remaining in 1999). The productive soils of the southern part of the Brigalow Belt, lowlands in South-east Queensland, New England Tableland and Central Queensland Coast have been, however, extensively cleared with 7–30% of remnant vegetation remaining. Between 1997 and 1999, the annual rate of remnant clearing in Queensland was 4460 km2 of which over 60% occurred in the Brigalow Belt bioregion. A greater proportion of this recent clearing occurred in Broad Vegetation Groups that are associated with less fertile and/or more arid parts of the State compared with pre 1997 clearing. For bioregions and regional ecosystems where past clearing has been extensive, a substantial proportion (50–91%) of the remaining vegetation is protected by bioregional and regional ecosystem thresholds prescribed under statewide legislation and associated policies. For other bioregions and regional ecosystems, other factors such as rainfall, soil and areas of high conservation value are likely to play a larger role in determining the amount of vegetation protected. However, the effectiveness of the Queensland legislation cannot be assessed until regional planning processes have been completed and all criteria addressed.
17
Debus, S. J. S., i H. A. Ford. "Responses of Eastern Yellow Robins Eopsaltria australis to translocation into vegetation remnants in a fragmented landscape." Pacific Conservation Biology 18, nr 3 (2012): 194. http://dx.doi.org/10.1071/pc130194.
Pełny tekst źródłaStreszczenie:
Many species of Australian robins (Petroicidae) are declining in wooded landscapes across southern Australia, perhaps because they are unable or unwilling to disperse across the matrix between remnants, or because they experience high mortality while doing so. Eastern Yellow Robins Eopsaltria australis have declined in parts of southeastern Australia, and have gone extinct in some woodland remnants. We translocated adult Yellow Robins to remnants from which they had disappeared, and followed their survival and behaviour. Nine Yellow Robins were translocated to a 100 ha remnant in 2001 (seven birds) and 2002 (two birds). One bird disappeared immediately and a second after 2 weeks, but the rest stayed for at least 2 months, with two birds surviving to at least 4 and 5 years. One reintroduced pair bred each year from 2001 to 2005, producing six fledglings. Two colour-banded Yellow Robins also arrived unaided from another remnant 7 km away. Fifteen Yellow Robins were translocated to nine small remnants (<60 ha) in 2005– 06. Seven birds disappeared within 3 days of their release, apparently killed by predators. The remainder survived for up to 7 weeks, but none was found breeding. Translocated Robins moved up to 3 km from their release sites through natural or planted corridors, and up to 1 km through a matrix of scattered trees. Small remnants, which surviving Robins ultimately vacated, had fewer shrubs than sites where they bred. The results suggest that Eastern Yellow Robins can disperse through a landscape with corridors or scattered trees. However, they may suffer predation and reject sites that are too small or of poor habitat quality. Management to retain Eastern Yellow Robins in a fragmented landscape should enlarge remnants, protect scattered trees, plant or regenerate strategic clumps of trees and shrubs in gaps between remnants, and allow shrubs to regenerate within remnants.
18
Hadden, SA, i ME Westbrooke. "Habitat Relationships of the Herpetofauna of Remnant Buloke Woodlands of the Wimmera Plains, Victoria." Wildlife Research 23, nr 3 (1996): 363. http://dx.doi.org/10.1071/wr9960363.
Pełny tekst źródłaStreszczenie:
Twelve remnants of woodland dominated by buloke (Allocasuarina leuhmannii [A. luehmannii]) in the Wimmera Plains of Victoria, Australia, were investigated to evaluate the habitat relationships of the herpetofauna. Reptiles and amphibians were assessed by pitfall trapping, systematic searching and recording of frog vocalisations. Site characteristics that are likely to affect the species richness of herpetofauna in buloke remnants were determined. Nine reptile and 4 amphibian species were recorded from 6048 trap-nights and 216 h of systematic searching. A significant relationship was found between the herpetofaunal and reptile species richness and the level of past grazing pressure and vegetation understorey structure. No correlation was found between herpetofaunal species richness and the area of the remnant. Species richness of amphibians was best predicted by soil type. Habitat features associated with each species are presented. Implications for the management of remnant buloke woodlands and their herpetofauna are discussed and recommendations made.
19
Grover, DR, i PJ Slater. "Conservation Value to Birds of Remnants of Melaleuca Forest in Suburban Brisbane." Wildlife Research 21, nr 4 (1994): 433. http://dx.doi.org/10.1071/wr9940433.
Pełny tekst źródłaStreszczenie:
The bird species composition of nine remnants of Melaleuca quinquenervia forest in NE Brisbane, Queensland, was censused from March 1992 to March 1993 to investigate the effect of forest fragmentation and fragment characteristics. Remnant area was a correlated with the total number of bird species and the number of raptors occurring, while understorey vegetation density was related to the number of forest and understorey bird species. The species composition of the M. quinquenervia remnants was compared with that of the Cooloola National Park and with that of eucalypt [Eucalyptus] remnants in lowland SE Queensland. Even the small M. quinquenervia remnants around Brisbane play an important role in conserving the avian fauna of the region by providing habitat and refuges for migrant, nesting, locally rate and uncommon species, and species not commonly found in other forest types. Future recommended management involves the maintenance of size, habitat diversity and understorey vegetation density, the prevention of disturbance and the preservation of swampy areas and ponds.
20
Veliky, A. S., i G. S. Tkachuk. "VEGETATION CHARACTERISTICS OF THE ISOLATED REMNANT UPLAND BETWEEN THE SELGON AND HARPI RIVERS (MIDDLE AMUR LOWLAND)". Regional problems 24, nr 2-3 (2021): 108–11. http://dx.doi.org/10.31433/2618-9593-2021-24-2-3-108-111.
Pełny tekst źródłaStreszczenie:
The authors present vegetation characteristics of the Selgon and Harpi rivers isolated remnant upland. It was compiled a vegetation map of six plant associations with a predominance of forest-type vegetation. The authors revealed the factors determining the upland flora diversity.
21
Seddon, Julian A., Andre Zerger, Stuart J. Doyle i Sue V. Briggs. "The extent of dryland salinity in remnant woodland and forest within an agricultural landscape". Australian Journal of Botany 55, nr 5 (2007): 533. http://dx.doi.org/10.1071/bt06100.
Pełny tekst źródłaStreszczenie:
Dryland salinity is considered a significant and increasing threat to sustainable land management and biodiversity across large parts of temperate Australia. However, there is little information on the extent of this threat to terrestrial ecosystems in south-eastern Australia. This paper provides a quantitative assessment of the extent of dryland salinity in remnant native woody vegetation in the agriculture-dominated landscape of the Boorowa Shire located in the South West Slopes bioregion of south-eastern Australia. The amount and type of native woody vegetation in the Boorowa Shire affected by dryland salinity was assessed by analysing the extent of overlap between the following three spatial data layers: (1) woody vegetation mapping derived from high-resolution satellite imagery, (2) existing vegetation community mapping predicted from field data and expert opinion and (3) existing dryland salinity outbreak mapping derived from air photo interpretation and filed verification. There were more than 6000 patches of salt outbreak in woody vegetation in the Boorowa Shire, 383 (6%) of which were 1 ha or larger in area. Almost 2000 ha of woody vegetation were affected by dryland salinity, representing ~3% of the extant native woody vegetation in the Boorowa Shire. The vegetation type with the largest total area affected by dryland salinity was yellow box (Eucalyptus melliodora Cunn. Ex Schauer)–Blakely’s red gum (E. Blakelyi Maiden) woodland. As a proportion of their current extent, vegetation communities lower in the landscape were significantly more affected than those higher up the topographic sequence, with 14% of riparian communities and nearly 6% of yellow box–Blakely’s red gum woodland exhibiting symptoms of dryland salinity. About 1% of white box (E. albens Benth) woodland, and of hill communities which are on mid- and upper slopes, were affected. The pattern of salinity outbreaks in relation to landscape position and vegetation type is significant for biodiversity conservation because the vegetation communities most affected by salinisation are those most heavily cleared and modified post-European settlement. Throughout the South West Slopes of New South Wales, remnants of riparian communities and yellow box–Blakely’s red gum woodland are highly cleared, fragmented and degraded. Dryland salinity represents an additional threat to these vegetation communities and their component species. Salinisation of woodland ecosystems poses significant problems for land managers. The long-term viability of these woodland remnants needs to be considered when allocating limited public funds for woodland conservation, whether on private land or in formal reserves.
22
Simpson, Greg D., Jackie Parker, Erin Gibbens i Philip G. Ladd. "A Hybrid Method for Citizen Science Monitoring of Recreational Trampling in Urban Remnants: A Case Study from Perth, Western Australia". Urban Science 4, nr 4 (8.12.2020): 72. http://dx.doi.org/10.3390/urbansci4040072.
Pełny tekst źródłaStreszczenie:
Vegetation trampling that arises from off-trail excursions by people walking for recreation can negatively impact the structure of understory plants in natural spaces that are an essential element of urban green infrastructure in a modern city. In addition to reducing the esthetic quality and environmental values of urban remnant and replanted native vegetation, such trampling reduces the habitat that supports wildlife populations within the urban fabric. This case study draws upon several disparate methods for measuring vegetation structure and trampling impacts to produce a hybrid method that community-based citizen scientists (and land managers and other researchers) could use to simply, rapidly, and reproducibly monitor how trampling associated with urban recreation trails impacts the structure of understory vegetation. Applying the novel hybrid method provided evidence that trampling had reduced the vegetation structure adjacent to a recreational walking trail in an urban woodland remnant in Perth, Western Australia. The hybrid method also detected ecological variability at the local ecosystem-scale at a second similar woodland remnant in Perth. The hybrid sampling method utilized in this case study provides an effective, efficient, and reproducible data collection method that can be applied to recreation ecology research into aspects of trampling associated with trail infrastructure.
23
Cuéllar-Rodríguez, G., E. Jurado i J. Flores. "Beetle diversity in fragmented thornscrub and isolated trees". Brazilian Journal of Biology 77, nr 1 (marzec 2017): 92–96. http://dx.doi.org/10.1590/1519-6984.10615.
Pełny tekst źródłaStreszczenie:
Abstract Due to land use change mainly for induced agriculture, Tamaulipan thornscrubin northeast Mexico has been cleared and transformed into small patches of vegetation as small as isolated trees surrounded by agricultural fields. In this study, we explored how tree isolation or growing inside a fragment of remnant vegetation influence diversity of coleopterans in two plant species (Prosopis laevigata (Humb. &Bonpl.exWilld.) M.C. Johnst. (mesquite) and Ebenopsis ebano (Berl.) Barneby (Texas ebony). We found 72 coleopteran morphospecies; fifteen occurred mainly in remnant fragments and ten mainly in isolated trees. There were more insects under isolated mesquites than under those immersed in remnant fragments, while in Texas ebony the highest beetle density for isolated trees coincided with periods of bean and maize in surrounding agriculture.
24
J. Hobbs, Richard. "Can revegetation assist in the conservation of biodiversity in agricultural areas?" Pacific Conservation Biology 1, nr 1 (1994): 29. http://dx.doi.org/10.1071/pc930029.
Pełny tekst źródłaStreszczenie:
It has been suggested that revegetation in agricultural areas to tackle land degradation problems can also aid in the conservation of biodiversity in these regions. Native biota is restricted to remnant areas, which are mostly small, often unconnected, and subject to a variety of impacts from the surrounding altered landscape. The current remnant network is not sufficient to ensure the long-term persistence of the biota, and requires enhancement. Revegetation provides an opportunity to protect and add to the existing remnant network. However, there are few data available with which to assess the likely impact of revegetation on conservation values, and few guidelines as to how revegetation should be designed for conservation purposes. This paper presents an initial framework for developing revegetation strategies which tie into the existing conservation network. Revegetation can either provide buffer strips around existing remnants to protect them from external impacts, corridors between them to increase connectivity, or additional habitat to increase the area of vegetation available, or can enhance degraded remnant areas. Precise design principles and specifications for these types of revegetation are lacking, and may not be appropriate since they will depend on vegetation types and the requirements of target species. In addition, revegetation will help retain biodiversity indirectly if it helps stabilize an otherwise degrading agricultural landscape. Revegetation in agricultural areas is compared with minesite rehabilitation, where the redevelopment of functioning ecosystems and faunal habitat appears to be possible. The task is harder in the agricultural situation because the scale of modification is greater, soil changes are more difficult to redress, and recolonization by native species is less likely. Increased research effort is needed on the implementation and effects of differing types of revegetation, strategies for increasing rates of adoption of revegetation and methods of integrating conservation considerations into revegetation programmes.
25
J. Franks, Andrew. "The ecological consequences of Buffel Grass Cenchrus ciliaris establishment within remnant vegetation of Queensland". Pacific Conservation Biology 8, nr 2 (2002): 99. http://dx.doi.org/10.1071/pc020099.
Pełny tekst źródłaStreszczenie:
The effects of Buffel Grass Cenchrus ciliaris presence and dominance in 78 Poplar Box Eucalyptus populnea woodland remnants of south central Queensland are documented, Buffel Grass was recorded from the majority of sites sampled, As the relative cover of Buffel Grass increased at both the quadrat and site level, the number of native ground cover species declined significantly. Most commonly recorded ground cover species displayed significant changes in frequency as Buffel Grass cover increased, Only two species increased with increased Buffel Grass cover: Desert Goosefoot Chenopodium desertorum subsp. anidiophyllum and Galvanised Burr Sclerolaena birchii. The average cover of Buffel Grass decreased significantly from the edge of remnants towards the core areas. The foliage projected cover of the sub-canopy layers appeared to be an important factor affecting the relative cover of Buffel Grass at any one site indicating that shading and competition with the woody layers are important determinants in the structure and composition of the ground cover layer. A number of sub-canopy species were found to produce leachates that were capable of significantly reducing the germination or growth of Buffel Grass seeds, alluding that allelopathy may play a minor role in determining ground cover species assemblages. However, this result can only be interpreted conservatively in relation to its ecological relevance with effects related to competition with overstorey woody species being of greater importance. This study quantifies the long observed effect that the exotic perennial Buffel Grass excludes other ground cover species, which may have detrimental ramifications on the functioning of remnant native vegetation over much of the state. With the recent introduction of regulations controlling broad scale tree clearing on both freehold and leasehold lands in Queensland, it is now important to identify a range of issues pertaining to the effective on ground management of remnant vegetation located outside the existing nature refuge network.
26
Fensham, R. J., J. C. McCosker i M. J. Cox. "Estimating Clearance of Acacia-dominated Ecosystems in Central Queensland Using Land-system Mapping Data". Australian Journal of Botany 46, nr 2 (1998): 305. http://dx.doi.org/10.1071/bt96129.
Pełny tekst źródłaStreszczenie:
Preferential clearance of productive Acacia-dominated ecosystems was determined using digital land-system mapping and a 1994–1995 native vegetation remnant coverage from central Queensland. The previously mapped land systems are composed of complexes of land units, covering a range of productive potentials that are not individually mapped but defined according to their proportions within the land systems. Some land units were grouped into 11 ‘Acacia ecosystems’ composed of unique combinations of geology and vegetation dominated by brigalow (Acacia harpophylla F.Muell. ex Benth.), gidgee (A. cambagei R.T.Baker) or blackwood (A. argyrodendron Domin). Calculation of the remnant area of these Acacia ecosystems, assuming equal proportions of vegetation clearance of the land unit components within the land-system complexes (equal proportion calculation), was compared with a more accurate calculation based on interpretation of aerial photography (aerial-photograph calculation) data. The aerial photograph calculation of remnant area was 44% of the equal proportion calculation for brigalow on Tertiary clay and the ratio between these calculations was greater than 100% for only one Acacia ecosystem of relatively low production potential. The proportion of the remnant Acacia ecosystems relative to less productive ecosystems on tenures assigned to production (leasehold and freehold) was consistently lower than on other tenures. The use of mapping consisting of composite ecosystems with various production potentials for area-based assessment of vegetation clearance will overestimate the remnant areas of the relatively productive types unless a procedure such as that outlined here is used to correct for preferential clearance. This study provides near-complete and accurate data on the 1994–1995 status of Acacia ecosystems in central Queensland. Relative to their original area, values ranged from 6.8% for brigalow on Tertiary clay to 37.6% for gidgee–blackwood on alluvium.
27
O'Grady, A. P., P. G. Cook, P. Howe i G. Werren. "Groundwater use by dominant tree species in tropical remnant vegetation communities". Australian Journal of Botany 54, nr 2 (2006): 155. http://dx.doi.org/10.1071/bt04179.
Pełny tekst źródłaStreszczenie:
Defining groundwater dependence and water-use requirements of terrestrial vegetation represents a significant challenge to water-resources managers. Terrestrial vegetation may exhibit complex spatial and temporal patterns of groundwater dependence. In this study we have assessed the sources of water used by dominant tree species in remnant vegetation of Pioneer Valley, Mackay, in northern Queensland. Water use by tree species was determined by sapflow techniques and the sources of water were investigated by using a combination of isotopic and water-potential measurements. Within the remnant vegetation communities of the Pioneer Valley there were complex patterns of water use and water-resource partitioning. However, all communities within the study showed some degree of groundwater use. Riparian communities that were reliant on groundwater discharge for maintenance of river baseflow exhibited high species diversity and complex forest structure and different species within these communities accessed a range of water sources including shallow soil water, river water and groundwater. In contrast, the woodlands and open forest were principally reliant on soil water. Although, species such as Corymbia clarksoniana appeared to be reliant on groundwater for their dry-season water-use requirements. This study demonstrated use of groundwater by remnant vegetation communities in the Pioneer Valley but determination of groundwater dependence requires a better understanding of the temporal patterns of water use and sources of water used by each species.
28
Smith, Rhiannon, i Nick Reid. "Carbon storage value of native vegetation on a subhumid–semi-arid floodplain". Crop and Pasture Science 64, nr 12 (2013): 1209. http://dx.doi.org/10.1071/cp13075.
Pełny tekst źródłaStreszczenie:
The protection of carbon (C) stores in the form of remnant native vegetation and soils is crucial for minimising C emissions entering the atmosphere. This study estimated C storage in soils, woody vegetation, dead standing vegetation, coarse woody debris, herbaceous vegetation, litter and roots in plant communities commonly encountered on cotton farms. River red gum was the most valuable vegetation type for C storage, having up to 4.5% C content in the surface (0–5 cm) soil, a total-site C store of 216 ± 28 t ha–1 (mean ± s.e.) and a maximum value of 396.4 t C ha–1. Grasslands were the least C-dense, with 36.4 ± 3.72 t C ha–1. The greatest proportion of C in river red gum sites was in standing woody biomass, but in all other vegetation types and especially grasslands, the top 0–30 cm of the soil was the most C-rich component. Aboveground woody vegetation determined total-site C sequestration, as it strongly influenced all other C-storing components, including soil C. This study illustrates the value of native vegetation and the soil beneath for storing large amounts of C. There is a case for rewarding farmers for maintaining and enhancing remnant vegetation to avoid vegetation degradation and loss of existing C stores.
29
Ridley, Anna M., Tim Paramore i Eloise Seymour. "Towards 'clean and green' farming systems using group learning to implement Environmental Management Systems". Australian Journal of Botany 51, nr 6 (2003): 637. http://dx.doi.org/10.1071/bt02112.
Pełny tekst źródłaStreszczenie:
Australian farmers want to market products as 'clean and green'. Environmental Management Systems (EMS) can help farmers improve their performance and justify 'green claims'. We worked with 12 farm families in southern New South Wales to develop and implement EMS using group learning and report progress towards developing more environmentally acceptable farming systems through increased perenniality and active management of remnant vegetation. Early on in the 3-year project, farmers assessed their environmental performance through development of a self-assessment questionnaire. Some had strong skills in management of remnant vegetation, whereas others were stronger in agronomy. Environmental monitoring tools were developed and tested, enabling farmers to assess on-farm perenniality, leakage (excess water lost) from paddocks and quality of remnant vegetation. Farmers became ready for the formal parts of EMS (environmental review, policy and action plans) half way through the project. The group-learning approach resulted in practice change. Improving farmers' understanding of environmental principles was found to be more important than the EMS process in achieving practice change, but EMS was a useful tool that enabled integration of production and environmental management.
30
Fensham, R. J., B. Laffineur i M. McVeigh. "Assessing the conservation status of tree species declining in productive landscapes: the case of Eucalyptus argophloia". Australian Journal of Botany 68, nr 2 (2020): 119. http://dx.doi.org/10.1071/bt20016.
Pełny tekst źródłaStreszczenie:
Eucalyptus argophloia is a species with a small geographic range occurring in a productive landscape with a subhumid climate. The past distribution of the species was assessed from remnant vegetation and standing paddock trees. The species grows in three specific vegetation types within its geographic range, and based on densities in remnant vegetation and reduction of habitat, it is estimated that the population has been reduced by 94.2%. There is very little regeneration of the species including on ungrazed roadsides, and further decline of the species is expected. The species can be categorised under IUCN Red Listing criteria as Critically Endangered. The present study provides a method for using habitat association, population decline and stand structure for conservation assessment of threatened tree species in productive landscapes.
31
A. How, R., i J. Dell. "Ground vertebrate fauna of Perth's vegetation remnants: impact of 170 years of urbanization". Pacific Conservation Biology 6, nr 3 (2000): 198. http://dx.doi.org/10.1071/pc000198.
Pełny tekst źródłaStreszczenie:
Ground vertebrates were surveyed on 34 vegetation remnants on the Swan Coastal Plain within the Perth metropolitan area. The remnants ranged from one hectare to nearly 340 ha and were sampled for at least 50 days during the year using pitfall traps. Six remnants were sampled in two or more successive years. Seven native, non-volant mammal, six introduced mammal, 11 amphibian and 43 reptile species were recorded. Native mammals are the most disadvantaged vertebrates in urban remnants with few species surviving the effects of long-term fragmentation. The herpetofauna is less affected, although snakes are generally rare. Marked annual variation occurred in lizard assemblages recorded on remnants sampled over consecutive years. On average, these remnants had a similarity in species composition of only 77% between years. Small remnants are important for conservation of reptile assemblages and there is a strong correlation between remnant area and species number for all reptile groups, except skinks. Remnants as small as one hectare retain viable populations of many reptiles, but need active management to exclude fire and predation. Regional biogeographic patterns are apparent in reptiles. Subregional patterns on the Swan Coastal Plain are associated with different soil types and the Swan River also creates a barrier across landforms. The diversity of reptile assemblages and variation in species trophic patterns indicate that many elements of the original food chain continue to operate in these urban environments.
32
Abensperg-Traun, Max, i Max Abensperg-Traun. "In defence of small habitat islands: Termites (Isoptera) in the Western Australian central wheatbelt, and the importance of dispersal power in species occurrence". Pacific Conservation Biology 6, nr 1 (2000): 31. http://dx.doi.org/10.1071/pc000031.
Pełny tekst źródłaStreszczenie:
Ecological theory has long undervalued the contribution of small remnants of native vegetation to nature conservation. This study provides data on colony persistence of remnant-dependent wood-eating termites in 28 remnants of mature wandoo (Eucalyptus capillosa) trees in paddock situations in the agricultural south-west of Western Australia. Remnants ranged in size from 2 to 30 trees, and in spatial isolation from 50 to 650 m. All remnants have been exposed to livestockrelated disturbance for >40 years. This study found that (1) Small remnants of eucalypt trees on farms retain important functional representatives, i.e., wood-eating termites for nutrient-cycling, and high species numbers. (2) Seventeen species have the capacity to establish and maintain colonies in remnants =5 trees. (3) Spatial isolation has no significant influence on the total number of termite species. (4) The number of trees (r = 0.60) and quantity of dead wood in the remnant (r = 0.86) were significant indicators of total termite species number. Larger remnants with low quantities of wood supported few termites, however. (5) Rare as well as common species persisted in small remnants. (6) Alate wing-size was a significant indicator of the occurrence of the six most common termite species in remnants (r = 0.84). The implication of isolation effects for rare species with limited powers of dispersal is self-evident, as is the need for the creation of habitat linkeages to reduce the effects of spatial isolation on the native fauna.
33
Blamey, Russell, John Rolfe, Jeff Bennett i Mark Morrison. "Valuing remnant vegetation in Central Queensland using choice modelling". Australian Journal of Agricultural and Resource Economics 44, nr 3 (wrzesień 2000): 439–56. http://dx.doi.org/10.1111/1467-8489.00119.
Pełny tekst źródła
34
Blodgett, Nell, Douglas A. Stow, Janet Franklin i Allen S. Hope. "Effect of fire weather, fuel age and topography on patterns of remnant vegetation following a large fire event in southern California, USA". International Journal of Wildland Fire 19, nr 4 (2010): 415. http://dx.doi.org/10.1071/wf08162.
Pełny tekst źródłaStreszczenie:
Large fire events in southern California have burned thousands of hectares over the past decade. Landscape pattern and natural system processes are shaped by these large conflagrations, thereby influencing the ecological structure and functioning of the region. Unburned vegetation remnants can be used to assess general fuel consumption and to provide valuable information regarding fire behaviour, weather effects and post-fire regeneration. For this study, post-fire unburned vegetation was mapped at a very fine spatial resolution based on semi-automatic classification of airborne large-format multispectral image data and compared across different fire environment zones within the 2003 Cedar Fire burn perimeter. Landscape metrics were used to characterise unburned vegetation patches for a section of the Cedar Fire affected by Santa Ana weather conditions and for a section of the fire that burned under non-Santa Ana weather conditions. Maps of remnant vegetation and associated landscape metrics were compared across these two sections and within shrubland community type, topography and age-class strata using inferential statistics. Key findings reveal more unburned vegetation in larger, rounder patches in the non-Santa Ana section. Pre-fire stand age greater than 6 years showed little effect on the amount or pattern of unburned vegetation within the Santa Ana section.
35
Abbott, Ian, i Allan Wills. "Distribution of the native earthworm fauna of the Perth metropolitan sector of the Swan Coastal Plain". Pacific Conservation Biology 8, nr 3 (2002): 196. http://dx.doi.org/10.1071/pc020196.
Pełny tekst źródłaStreszczenie:
Assessment of areas suitable for inclusion in a comprehensive, adequate and representative (CAR) reserve system has been based primarily on distribution of original native vegetation and occurrence of vertebrates, particularly birds and mammals. However, reliable predictors of vertebrate and floristic diversity are not necessarily adequate predictors of invertebrate diversity. We sampled the earthworm fauna of the Perth metropolitan Swan Coastal Plain (SCP) to examine whether vegetation-based criteria are sufficient for identifying a conservation estate for native earthworms. Twenty-one native species were collected from 136 sample localities. All five previously described native species from the region and three native species previously collected but not formally described were again collected, while 13 previously uncollected species were found. Species abundances of native earthworms were uneven, in common with species-abundance relationships for many other invertebrate assemblages, with 10 singleton occurrences of species and few common species. Species diversity increased away from the coast across the sandy geomorphic units Quindalup, Spearwood and Bassendean. Our study did not resolve whether dlifferences in earthworm faunas reflect the gradient in soil qualities across these units, gradients in species-area effects, habitat diversity effects or a combination of these. Blocks of remnant vegetation identified in the Western Australian Government's Bush Forever plan as containing natural areas of regional conservation value are also likely to support at least one native earthworm species. However, many of the blocks of remnant vegetation so identified are not within the formal conservation estate. Two species identified in this survey fortuitously persist only in remnant vegetation patches not considered regionally significant. Actual regional diversity was estimated to be 38 native species, indicating many uncollected relatively rare species. Although earthworms are a low diversity group compared with other invertebrates, the localized distributions of most species indicate that the formal conservation estate does not provide adequate protection. Ongoing degradation of unprotected remnant vegetation will result in extinctions of localized invertebrate species.
36
R. Williams, Matthew. "Butterflies and day-flying moths in a fragmented urban landscape, south-west Western Australia: patterns of species richness". Pacific Conservation Biology 15, nr 1 (2009): 32. http://dx.doi.org/10.1071/pc090032.
Pełny tekst źródłaStreszczenie:
Surveys of butterflies and day-flying moths were conducted at 46 bushland remnants in the Swan Coastal Plain, Western Australia, between 2001 and 2005. A total of 17 075 individuals was recorded, representing 35 butterfly and 5 day-flying moth species. Individual site species richness varied between one and 27 species. Two main groups of taxa were identified: (i) species that are reliant on remnant native vegetation for breeding and are entirely or predominantly restricted to remnant bushland (resident species or urban avoiders, 27 taxa); and (ii) species that now breed primarily on introduced plants and disperse readily through the urban matrix, but which also visit remnant bushland and sometimes breed there (non-resident species or urban adapters, 13 taxa). Estimated species detectability varied widely between species and seasonally, but for most taxa was consistent across the three years of the study. Peak detectability was strongly related to observed abundance, something that is well known (intuitively), but has rarely been demonstrated (quantitatively). Only one listed endangered species was recorded, the Graceful Sun-moth Synemon gratiosa which was observed in low numbers at six sites. Several species were encountered less frequently, although these have populations outside the region. Few of the surveyed remnants were considered to have an intact butterfly fauna; it is inferred that the majority had lost some or all of their original resident species. The reliance of many species on specific host plants, and the ability of some to adapt to introduced weeds, are important factors in their persistence within remnants. These bushland remnants are effectively habitat islands for butterflies and day-flying moths, and the few remaining species-rich bushlands are therefore of regional importance for conservation of this group. This paper serves as a baseline study against which to monitor any future changes to the butterfly fauna of these remnants.
37
Bridle, Kerry, Margy Fitzgerald, David Green, Janet Smith, Peter McQuillan i Ted Lefroy. "Relationships between site characteristics, farming system and biodiversity on Australian mixed farms". Animal Production Science 49, nr 10 (2009): 869. http://dx.doi.org/10.1071/an09042.
Pełny tekst źródłaStreszczenie:
A collaborative project between researchers, regional natural resource management organisations and landholders set out to explore three questions about the relationships between biodiversity and land use in Australia’s mixed-farming landscapes: (1) the extent to which farm-scale measures of biodiversity were related to agricultural production; (2) the influence of the type and intensity of agricultural production on native biodiversity on farms; and (3) the relative influence of site and farming system on selected measures of biodiversity. Four land-use types on 47 mixed farms across nine regions, derived from several of Australia’s 56 natural resource management regions, were surveyed in autumn and spring 2006 and 2007. Surveys of birds, surface invertebrates (beetles, ants, spiders), vegetation and soils were undertaken on four land classes on each farm; crop, ‘rotation’ (break crop/pasture phase), perennial pasture and remnant vegetation. Data were collected by participating regional staff, using a standard protocol, which were sent to a central collection point for collation, analysis and interpretation. Species richness, functional diversity and vegetation structure were assessed. This introductory paper focuses on results relating to species richness, which for most taxa was greater in remnant vegetation than other land-use classes and declined along a disturbance gradient (remnant, pasture, rotation, crop). Properties with a greater proportion of perennial pastures recorded higher species richness than properties that were dominated by crop. Properties that recorded high wheat yields (t/ha) also recorded lower species richness for spiders and birds. The presence of insectivorous birds and beneficial invertebrates (spiders, beetles and ants) in all land-use classes suggests the potential to apply integrated pest management approaches to mixed-farming systems across the country. Site and system features were found to be important determinants of biodiversity, with their relative importance varying with the scale of investigation and the taxa. At the landscape scale, bird species richness was correlated with the amount of remnant vegetation within a 5-km radius of the farm boundary, and with the condition of native vegetation on the farm. The average size of remnant vegetation patches was 5 ha or less on nearly half of the properties surveyed. At the farm scale, ant species richness was correlated with site features, while beetles were correlated with management/system features such as the presence and fertility of perennial pastures. Analyses at the functional group level will provide more detailed information on relationships between different land-use types. Further experimental work needs to be undertaken to qualify the suggested impact of land management practices on different taxa, while repeated surveys will allow for the collation of datasets over time, from which population dynamics may be determined.
38
Good, Megan K., Jodi N. Price, Peter J. Clarke i Nick Reid. "Dense regeneration of floodplain Eucalyptus coolabah: invasive scrub or passive restoration of an endangered woodland community?" Rangeland Journal 34, nr 2 (2012): 219. http://dx.doi.org/10.1071/rj12008.
Pełny tekst źródłaStreszczenie:
Clearing of native vegetation and changes to disturbance regimes have resulted in dense regeneration of native trees and shrubs in parts of Australia. The conversion of open vegetation to dense woodlands may result in changes to the composition of plant communities and ecosystem function if structure, composition and function are tightly linked. Widespread clearing of the floodplain tree Eucalyptus coolabah subsp. coolabah (coolibah), in New South Wales, Australia, has led to state and federal listings of coolibah woodland as an endangered ecological community. Dense regeneration of coolibah in the mid 1970s, however, also resulted in its listing as an ‘invasive native species’ in NSW, meaning it can be legally cleared under certain conditions. Dense regeneration could be a novel state dissimilar to the threatened community or it could represent the next generation of coolibah woodlands and may contribute to passive restoration of heavily cleared landscapes. This study investigated if dense stands are distinct from remnant woodland by comparing floristic composition of the ground-storey community and top-soil properties of four coolibah vegetation states: derived grassland, derived degraded grassland, dense regeneration and remnant woodland. Ground-storey composition was found to overlap broadly among states regardless of tree density. Most species were common to all states, although dense regeneration contained characteristic woodland species that were absent from grasslands. The carbon : nitrogen ratio of the soil was significantly higher in dense regeneration and remnant woodland than in either of the grassland states, indicating that the woody states are broadly similar in terms of nutrient cycling. The study demonstrates that structurally different vegetation states (grasslands, woodlands and dense regeneration) are not associated with distinct plant communities. The results also suggest that grazing management has a more pronounced effect on ground-storey composition of plant communities than tree density and that well managed derived grasslands and dense regeneration are floristically similar to remnant woodlands. Since dense regeneration and remnant woodlands are not floristically distinct from one another, dense regeneration could contribute to the conservation of endangered coolibah woodlands in cleared agricultural landscapes.
39
Prober, SM, i KR Thiele. "Conservation of the Grassy White Box Woodlands: Relative Contributions of Size and Disturbance to Floristic Composition and Diversity of Remnants". Australian Journal of Botany 43, nr 4 (1995): 349. http://dx.doi.org/10.1071/bt9950349.
Pełny tekst źródłaStreszczenie:
Before European settlement, grassy white box woodlands were the dominant vegetation in the east of the wheat-sheep belt of south-eastern Australia. Tree clearing, cultivation and pasture improvement have led to fragmentation of this once relatively continuous ecosystem, leaving a series of remnants which themselves have been modified by livestock grazing. Little-modified remnants are extremely rare. We examined and compared the effects of fragmentation and disturbance on the understorey flora of woodland remnants, through a survey of remnants of varying size, grazing history and tree clearing. In accordance with fragmentation theory, species richness generally increased with remnant size, and, for little-grazed remnants, smaller remnants were more vulnerable to weed invasion. Similarly, tree clearing and grazing encouraged weed invasion and reduced native species richness. Evidence for increased total species richness at intermediate grazing levels, as predicted by the intermediate disturbance hypothesis, was equivocal. Remnant quality was more severely affected by grazing than by remnant size. All little-grazed remnants had lower exotic species abundance and similar or higher native species richness than grazed remnants, despite their extremely small sizes (< 6 ha). Further, small, littlegrazed remnants maintained the general character of the pre-European woodland understorey, while grazing caused changes to the dominant species. Although generally small, the little-grazed remnants are the best representatives of the pre-European woodland understorey, and should be central to any conservation plan for the woodlands. Selected larger remnants are needed to complement these, however, to increase the total area of woodland conserved, and, because most little-grazed remnants are cleared, to represent the ecosystem in its original structural form. For the maintenance of native plant diversity and composition in little-grazed remnants, it is critical that livestock grazing continues to be excluded. For grazed remnants, maintenance of a site in its current state would allow continuation of past management, while restoration to a pre-European condition would require management directed towards weed removal, and could take advantage of the difference noted in the predominant life-cycle of native (perennial) versus exotic (annual or biennial) species.
40
Waymouth, Vicky, Rebecca E. Miller, Sabine Kasel, Fiona Ede, Andrew Bissett i Cristina Aponte. "Soil Bacterial Community Responds to Land-Use Change in Riparian Ecosystems". Forests 12, nr 2 (28.01.2021): 157. http://dx.doi.org/10.3390/f12020157.
Pełny tekst źródłaStreszczenie:
Riparian forests were frequently cleared and converted to agricultural pastures, but in recent times these pastures are often revegetated in an effort to return riparian forest structure and function. We tested if there is a change in the soil bacterial taxonomy and function in areas of riparian forest cleared for agricultural pasture then revegetated, and if soil bacterial taxonomy and function is related to vegetation and soil physicochemical properties. The study was conducted in six riparian areas in south-eastern Australia, each comprising of three land-use types: remnant riparian forest, cleared forest converted to pasture, and revegetated pastures. We surveyed three strata of vegetation and sampled surface soil and subsoil to characterize physicochemical properties. Taxonomic and functional composition of soil bacterial communities were assessed using 16S rRNA gene sequences and community level physiological profiles, respectively. Few soil physiochemical properties differed with land use despite distinct vegetation in pasture relative to remnant and revegetated areas. Overall bacterial taxonomic and functional composition of remnant forest and revegetated soils were distinct from pasture soil. Land-use differences were not consistent for all bacterial phyla, as Acidobacteria were more abundant in remnant soils; conversely, Actinobacteria were more abundant in pasture soils. Overall, bacterial metabolic activity and soil carbon and nitrogen content decreased with soil depth, while bacterial metabolic diversity and evenness increased with soil depth. Soil bacterial taxonomic composition was related to soil texture and soil fertility, but functional composition was only related to soil texture. Our results suggest that the conversion of riparian forests to pasture is associated with significant changes in the soil bacterial community, and that revegetation contributes to reversing such changes. Nevertheless, the observed changes in bacterial community composition (taxonomic and functional) were not directly related to changes in vegetation but were more closely related to soil attributes.
41
R. Fulton, Graham, i Jonathan D. Majer. "The effect of recent chaining on birds in the eastern wheatbelt of Western Australia". Pacific Conservation Biology 12, nr 3 (2006): 168. http://dx.doi.org/10.1071/pc060168.
Pełny tekst źródłaStreszczenie:
The decline of woodland birds that follows from habitat fragmentation, degradation and loss of connectivity is well reported in the literature. However, reports of immediate responses by birds to these events are scant. This study, in the eastern whealtbelt of Western Australia, detected that when half of a 10 ha remnant of Allocasuarina shrubland was chained (vegetation knocked over and largely killed), birds responded quickly; increaser species apparently benefited and decliner species became restricted to the remaining unchained remnant of shrubland. There was some correspondence between the trends in variety and/or abundance of arthropods with those of bird species richness. Two Near-threatened species, the White-browed Babbler Pomatostomus supercilious and the Crested Bellbird Oreoica gutturalis, were only detected in the non-chained part of the remnant. These findings clearly highlight the immediate ecological consequences of clearing of native vegetation, and highlight the importance of conserving even the smallest remaining fragments.
42
Saunders, Denis A., i A. J. McAleer. "The conservation value of private property; a case study of the birds of Woopenatty, Arrino, in the northern wheatbelt of Western Australia, 1987–2002." Pacific Conservation Biology 18, nr 3 (2012): 164. http://dx.doi.org/10.1071/pc130164.
Pełny tekst źródłaStreszczenie:
Woopenatty was a 7,293 ha wheat-sheep property in the Geraldton Sandplains biogeographic region of the northern wheatbelt of Western Australia. Data were collected on the presence of bird species seen on a weekly basis on the property from October 1987 until the end of 2002. A total of 133 species was recorded from the property during this period with 52 species of resident, 16 species of regular visitor, 15 species of irregular visitor and 50 vagrant species. The avifauna of the property was compared with records collated from 1904 from eight locations within a radius of 110 km of the property and from records within a radius of 50 km of the property from two Birds Australia atlases (1977– 1981 and 1997–2002). Seventy-four percent of the species, including many dependent on remnant native vegetation, recorded from the other localities were recorded on Woopenatty. The property was clearly of importance for conservation of the avifauna of the Geraldton Sandplains. This study illustrates the importance of publishing descriptions of regional biota in order to assess changes over time and the significance of remnant native vegetation on private property to conservation. Suggestions for setting priorities for conservation and management of such remnant native vegetation are made.
43
Fuentes-Castillo, Taryn, Alejandro Miranda, Antonio Rivera-Hutinel, Cecilia Smith-Ramírez i Milena Holmgren. "Nucleated regeneration of semiarid sclerophyllous forests close to remnant vegetation". Forest Ecology and Management 274 (czerwiec 2012): 38–47. http://dx.doi.org/10.1016/j.foreco.2012.02.019.
Pełny tekst źródła
44
Lunt, Ian D., i John W. Morgan. "Vegetation Changes after 10 Years of Grazing Exclusion and Intermittent Burning in a Themeda triandra (Poaceae) Grassland Reserve in South-eastern Australia". Australian Journal of Botany 47, nr 4 (1999): 537. http://dx.doi.org/10.1071/bt98011.
Pełny tekst źródłaStreszczenie:
Changes in the vegetation composition of a remnant Themeda triandra Forsskal grassland in south-eastern Australia were documented following the replacement of stock grazing with intermittent burning at 3–11-year intervals. The vegetation was initially sampled in 1986, 1 year after stock were removed, and then 10 years later in 1996. Most frequently encountered grassland species were abundant in both surveys, although there was little correspondence between species richness at the quadrat scale in 1986 and 1996. Total floristic richness increased slightly over the 10-year period, owing to the proliferation of tall forbs with wind-blown seeds, including exotic thistles and colonising native forbs. Unfortunately, most native ‘increasers’ were ‘weedy’ species which are not typical or common components of species-rich temperate grassland remnants in southern Victoria. Thus, replacing grazing with intermittent burning has not resulted in the flora becoming more similar to that of high-quality, species-rich grassland remnants, but instead, has promoted a group of ruderal colonisers. The ability to identify factors contributing to particular botanical changes was hampered by the design of the management regimes implemented over the past decade. Suggestions are provided to overcome these difficulties, incorporating principles from adaptive management.
45
Mcfarlane, DJ, i RJ George. "Factors affecting dryland salinity in two wheat belt catchments in Western Australia". Soil Research 30, nr 1 (1992): 85. http://dx.doi.org/10.1071/sr9920085.
Pełny tekst źródłaStreszczenie:
We investigated why the Wallatin Creek Catchment in the Western Australian wheatbelt had an appreciable area of secondary salinity whereas the adjoining North Baandee Catchment had almost none. The Wallatin Creek Catchment, which is long and narrow, had a shallow regolith over granite bedrock. Although this catchment had less salt stored in the regolith than the wider North Baandee Catchment, the groundwaters came close to the ground surface because the regolith was thin and the valley cross-section narrow. Management practices which increase recharge (e.g. using level banks to control runoff), are likely to result in increased salinity in the short term in the Wallatin Creek Catchment. We also investigated whether retaining areas of remnant vegetation had reduced the amount of secondary salinity in a sub-catchment of the Wallatin Creek Catchment. At comparable positions in the landscape, groundwater levels were up to 7 m lower under the remnant vegetation. The vegetation appears to have delayed, if not prevented, the development of salinity in nearby and downslope areas.
46
Lopes, Marcos Vinícius Almeida, i Gilberto Marcos de Mendonça Santos. "Do Bottom-up Effects Define The Structuring Of Ant (Hymenoptera: Formicidae) Communities In A Restinga Remnant?" Sociobiology 67, nr 2 (30.06.2020): 223. http://dx.doi.org/10.13102/sociobiology.v67i2.4938.
Pełny tekst źródłaStreszczenie:
Restingas are lowland sandy ecosystems located between mountain ranges and the sea. For living organisms in this ecosystem, restingas can be seen as habitats formed by islands of vegetation separated by a sandy matrix. These organisms are highly influenced by the environmental conditions and physical characteristics of the landscape, including size, connectivity and environmental heterogeneity. Given the recognized effectiveness of ants as bioindicators, this study uses these organisms as a model to assess how vegetation complexity affects ant communities. The study was carried out in the Parque das Dunas, Salvador - Bahia. Within this park, four categories of vegetation islands (Small, Medium, Large and Continuous) were delimited, where the ant fauna was sampled and the forms of vegetal life were analyzed, using the Raunkiaer analysis. A total of 69 ant species were collected from 31 genera and six subfamilies. We found a positive relationship between the diversity of plant life forms (H') and ant richness. In general, there was a significant difference in the composition of ant species in each microhabitat and between the areas of continuous vegetation and the different vegetation islands. There is a bottom up effect mediating the ant community associated with dune vegetation, the local richness of ant species responds to vegetation heterogeneity.
47
Law, Bradley S., Mark Chidel i Trent Penman. "Do young eucalypt plantations benefit bats in an intensive agricultural landscape?" Wildlife Research 38, nr 3 (2011): 173. http://dx.doi.org/10.1071/wr10204.
Pełny tekst źródłaStreszczenie:
Context Environmental benefits of timber plantations have been a major selling point for land use change from previously cleared farmland, but data concerning the response of biodiversity are scarce. Aims We investigated the use of young (4–11 years old) timber plantations by bats in comparison with other vegetation classes in a highly cleared and productive agricultural landscape in north-west New South Wales (NSW), Australia. Methods Initially, we recorded activity in paddocks before plantation establishment, and then four to six years after establishment. We compared activity within young eucalypt plantations with surrounding paddocks and remnant woodland. We also radio-tracked four different bat species to investigate how roosting and foraging was apportioned into different habitats. Key results The ultrasonic survey of bats found that the young plantations were typically used by 7–8 species and activity averaged 87 passes per night. Activity within plantations was similar to treeless paddocks, and approximately six times less than in small remnants. The very high activity levels and feeding buzzes in small remnants was significantly related to rich, basalt soil (which was used as a proxy for invertebrate biomass) on agricultural plains. Total activity and species richness was correlated positively with the number of remnant trees on the site, but neither plantation area nor shape influenced bat activity. Plantations were not used preferentially by radio-tracked bats at night compared with their availability in the local landscape (13–14% bat use, 17% available). No bat roosts were located within the plantations. Most bat roosts were in tree hollows, which were absent in the plantations. Decorticating bark was abundant in eucalypt plantations, but only Nyctophilus geoffroyi was observed beneath bark and only in remnant trees outside of plantations. Conclusions Young eucalypt plantations have limited value for bats, and this is comparable to previous studies on more environmentally focussed plantings. Implications The value of plantations for bats would be improved by retaining remnant trees, both in the surrounding landscape and within plantations. We also recommend varying tree densities to increase the diversity of animal species using plantations.
48
Briggs, Sue V., Nicola M. Taws, Julian A. Seddon i Bindi Vanzella. "Condition of fenced and unfenced remnant vegetation in inland catchments in south-eastern Australia". Australian Journal of Botany 56, nr 7 (2008): 590. http://dx.doi.org/10.1071/bt08046.
Pełny tekst źródłaStreszczenie:
Considerable areas of remnant native vegetation have been fenced in the last decade to manage grazing by domestic stock. This study investigated vegetation condition in comparative fenced and unfenced remnant vegetation in the mid–upper Murrumbidgee and Lachlan catchments in south-eastern Australia. Native species richness, native groundcover and overstorey regeneration were higher at fenced than at unfenced sites. Area of bare ground was lower at fenced sites. Exotic groundcover did not differ between fenced and unfenced sites. Native species richness was higher at sites fenced for longer and with no stock grazing; neither native nor exotic groundcover at fenced sites was related to time since fencing or stock grazing pressure. Some tree species regenerated at both fenced and unfenced sites (Blakely’s red gum, Eucalyptus blakelyi; tumbledown gum, E. dealbata, long-leaved box, E. goniocalyx; red stringbark, E. macrorhyncha), some regenerated at few fenced and few unfenced sites (white box, E. albens; yellow box, E. melliodora) and some regenerated at fenced sites but not at unfenced sites (grey box, E. microcarpa; mugga ironbark, E. sideroxylon; white cypress pine, Callitris glaucophylla). Although less robust than pre- and postfencing monitoring, the comparisons reported here provide a logistically feasible and relatively inexpensive assessment of effects of the sizeable public investment in fencing on vegetation condition.
49
Highland, S. A., M. V. Santelmann i R. A. Schwindt. "Vegetation Dynamics of Restored and Remnant Willamette Valley, OR Prairie Wetlands". Ecological Restoration 33, nr 2 (6.05.2015): 156–70. http://dx.doi.org/10.3368/er.33.2.156.
Pełny tekst źródła
50
O'Shea, E. M., i J. B. Kirkpatrick. "The impact of suburbanization on remnant coastal vegetation in Hobart, Tasmania". Applied Vegetation Science 3, nr 2 (24.02.2000): 243–52. http://dx.doi.org/10.2307/1479003.
Pełny tekst źródła