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Letteratura scientifica selezionata sul tema "Salt lake ecology Australia"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 12 febbraio 2022

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Articoli di riviste sul tema "Salt lake ecology Australia"

MARSH, JESSICA R., PETER HUDSON, and VOLKER W. FRAMENAU. "A ghost in the salt: A new species of halotolerant tube-web spider in the genus Ariadna (Araneae: Segestriidae)." Zootaxa 4952, no. 3 (April 12, 2021): 580–88. http://dx.doi.org/10.11646/zootaxa.4952.3.10.

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A new species of halotolerant Ariadna Audouin, 1826 is described from Western Australia, based on morphological features of both the male and female, and elevating the total number of described species of Ariadna in Australia to 14. This is the first record of the tube-web spider family Segestriidae Simon, 1893 inhabiting salt lakes, where they construct burrows in to the lake surface. The species is likely to be of conservation importance, due to its specialised habitat requirements and the many threats posed to the salt lake ecosystem. We provide recommendation for Ariadna phantasma sp. nov. to be considered for inclusion in the IUCN Red List.

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Kingsford, R. T., and J. L. Porter. "Waterbirds on an adjacent freshwater lake and salt lake in arid Australia." Biological Conservation 69, no. 2 (1994): 219–28. http://dx.doi.org/10.1016/0006-3207(94)90063-9.

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Bayly, IAE. "Distinctive aspects of the zooplankton of large lakes in Australasia, Antarctica and South America." Marine and Freshwater Research 46, no. 8 (1995): 1109. http://dx.doi.org/10.1071/mf9951109.

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Not only has the degree of species-level cosmopolitanism amongst zooplanktonic organisms been considerably overestimated, but differences between the different classical biogeographic regions (established from terrestrial studies) occur at supra-specific levels as high as family or even suborder. The Centropagidae, and particularly the genus Boeckella, are found in New Zealand, most of Australia, southern and high altitude regions of South America, and around the periphery of Antarctica. The biogeography and ecology of this family is discussed in detail. Most predaceous families of Cladocera are entirely absent from the Australian and Neotropical regions. The genus Daphniopsis occurs in salt lakes in Australia and South America and in freshwater lakes in Antarctica. In southern Australia numerous species of ostracod have colonized the limnetic region of salt lakes, and the largest of these prey on species of Calamoecia, Daphniopsis and small ostracods. Chaoboridae are absent from New Zealand as, too, are obligate planktivorous fish. The Chilean flamingo, Phoenicopterus chilensis, and Wilson's phalarope, Phalaropus tricolor, are significant predators on Boeckella poopoensis in salt lakes on the Andean Altiplano and elsewhere in South America.

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Saccò, Mattia, Nicole E. White, Matthew Campbell, Sebastian Allard, William F. Humphreys, Paul Pringle, Farid Sepanta, Alex Laini, and Morten E. Allentoft. "Metabarcoding under Brine: Microbial Ecology of Five Hypersaline Lakes at Rottnest Island (WA, Australia)." Water 13, no. 14 (July 9, 2021): 1899. http://dx.doi.org/10.3390/w13141899.

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Hypersaline ecosystems—aquatic environments where concentration of salt exceeds 35 g L−1—host microbial communities that are highly specialised to cope with these extreme conditions. However, our knowledge on the taxonomic diversity and functional metabolisms characterising microbial communities in the water columns of hypersaline ecosystems is still limited, and this may compromise the future preservation of these unique environments. DNA metabarcoding provides a reliable and affordable tool to investigate environmental dynamics of aquatic ecosystems, and its use in brine can be highly informative. Here, we make use of bacterial 16S metabarcoding techniques combined with hydrochemical analyses to investigate the microbial patterns (diversity and functions) from five hypersaline lakes located at Rottnest Island (WA). Our results indicate lake-driven microbial aquatic assemblages that are characterised by taxonomically and functionally moderately to extremely halophilic groups, with TDS (total dissolved solids) and alkalinity amongst the most influential parameters driving the community patterns. Overall, our findings suggest that DNA metabarcoding allows rapid but reliable ecological assessment of the hypersaline aquatic microbial communities at Rottnest Island. Further studies involving different hypersaline lakes across multiple seasons will help elucidate the full extent of the potential of this tool in brine.

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Ruebhart, David R., Ian E. Cock, and Glen R. Shaw. "Invasive character of the brine shrimp Artemia franciscana Kellogg 1906 (Branchiopoda: Anostraca) and its potential impact on Australian inland hypersaline waters." Marine and Freshwater Research 59, no. 7 (2008): 587. http://dx.doi.org/10.1071/mf07221.

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Brine shrimp (Artemia species) are a major faunal element in many hypersaline biotopes throughout the world and are used extensively in aquaculture, the aquarium trade, solar salt fields and in toxicity bioassays. Commercially available brine shrimp are generally Artemia franciscana cysts, primarily harvested from Great Salt Lake, Utah, USA. The invasive potential of this species raises concerns about its presence in Australia. We reviewed recent overseas reports of the occurrence of A. franciscana populations and confirm that the use of this species has extended its natural geographic range through both deliberate and inadvertent releases. In Australia, Artemia species have been previously identified as being a threat to ecosystem health and biodiversity; however, the specific recognition of A. franciscana was not made. In reviewing the biogeography of Artemia species in Australia, we provide a collation of the reported populations of A. franciscana. The biological attributes of this species contributing to its invasive success are also compiled. The implications of further releases and increases in the range of this species to Australian inland waters are discussed. We appeal for increased vigilance regarding the importation and use of this potentially highly invasive species and monitoring for its presence.

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Hudson, P., and M. Adams. "Allozyme Characterisation of the Salt Lake Spiders (Lycosa: Lycosidae: Araneae) of Southern Australia: Systematic and Population Genetic Implications." Australian Journal of Zoology 44, no. 5 (1996): 535. http://dx.doi.org/10.1071/zo9960535.

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Allozyme electrophoresis was used to determine the genetic relationships amongst various populations of Lycosa alteripa, L. eyrei and L. salifodina, the three described species of wolf spider endemic to the normally dry salt lakes of southern Australia. A total of 185 individuals from 38 sites was analysed for allozyme variation at 31-35 loci. The results demonstrate the presence of two additional species of salt lake spider, one related to L. alteripa and the other related to L. eyrei. Limited population genetic analysis of the data indicates that population substructuring is common within most species, often to the finest level of geographic sampling. The data indicate that gene flow is limited in these species and reveal three instances of a similar macro-geographic pattern being displayed amongst subpopulations or taxa in central South Australia. Estimates of genetic divergence between the five taxa have also been used to provide a 'first-guess' estimate of the times of divergence for the major cladogenic events within this lineage.

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Kavazos, Christopher R. J., Megan J. Huggett, Ute Mueller, and Pierre Horwitz. "Biogenic processes or terrigenous inputs? Permanent water bodies of the Northern Ponds in the Lake MacLeod basin of Western Australia." Marine and Freshwater Research 68, no. 7 (2017): 1366. http://dx.doi.org/10.1071/mf16233.

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The saline wetlands of the Northern Ponds, Lake MacLeod, contravene general classifications for salt lakes because, despite enduring high levels of evaporation, they contain permanently inundated ponds that are continually supplied with seawater by a seepage face from the Indian Ocean. The present study investigated the physical, sediment and chemical characteristics of these ponds, using sonar, flow-rate measurements, microscopy and inductively coupled plasma–mass spectrometry to understand the role of biogenic and terrigenous inputs on the benthic habitats. The chemical composition of the water bodies did not differ significantly from the seawater feedstock, which facilitates biogenic sediment accumulation. The largest permanent water body differs from the other ponds in physical and chemical structure, in that, possibly because of its size, it is dominated by terrigenous inputs, which result in higher nutrient concentrations and non-biogenic sediments. The Northern Ponds represent a system where the hydrology permits the establishment of permanent wetlands in an arid environment. Because of the constant supply of seawater, the ponds have a blend of habitat characteristics from marine and other inland salt-lake environments. The present study showed that a ‘marine-like’ state can override more typical characteristics of inland water bodies where discharge rates are high and water-residence times are low.

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Moulton, T. P., M. A. Burford, and T. R. Sommer. "The ecology of Dunaliella species (Chlorophyta, Volvocales) in the coastal salt lake, Hutt Lagoon, Western Australia." SIL Proceedings, 1922-2010 23, no. 4 (December 1988): 1908–11. http://dx.doi.org/10.1080/03680770.1987.11899817.

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Schultheiss, Patrick, Sebastian Schwarz, Ken Cheng, and Rüdiger Wehner. "Foraging ecology of an Australian salt-pan desert ant (genus Melophorus)." Australian Journal of Zoology 60, no. 5 (2012): 311. http://dx.doi.org/10.1071/zo12096.

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Over the expanse of the salt lakes of the Lake Eyre basin lives a species of ant of the genus Melophorus (as yet unnamed), both on the edges of the salt-pan and on the salt-pan itself. Most of the foragers are small (~3.0–5.0 mm), but ~10% of the ants seen foraging are much larger (~7.0 mm) and may form a soldier caste. Foragers are thermophilic and show diurnal activity, displaying a single-peaked activity profile across the day, with activity time limited to 2–6 h at most each day (during the late-summer study period, 28 February to 28 March 2012). They forage largely for dead arthropods, but also occasionally bring home plant materials. Foraging success (not considering possible liquid food intake) is ~20%, resembling the success rate of their congener Melophorus bagoti, which inhabits cluttered environments. When displaced with food from a feeder, the ants head systematically and precisely in the feeder-to-nest direction, thus exhibiting path integration abilities involving celestial compass cues. The study of this species provides an interesting comparative perspective in contrasting desert ants of the same genus and thus genetic heritage inhabiting habitats differing in complexity of panoramic terrestrial cues as well as comparing ecologically similar species inhabiting the same type of habitat (in the present case, salt-pans) but differing in their phylogenetic relationships.

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Timms, BV. "Limnology of Lake Buchanan, a tropical saline lake, and associated pools, of North Queensland." Marine and Freshwater Research 38, no. 6 (1987): 877. http://dx.doi.org/10.1071/mf9870877.

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During 1974-1984, Lake Buchanan and seven peripheral pools usually contained water for only a few months each year, commencing in late summer. They ranged in salinity from 1 to 202 g l-1, their waters were dominated by sodium chloride, but with Ca2+/Mg2+ ratios of c. 1, and were generally alkaline. The fauna of 53 species included three halobionts (e.g. Parartemia minuta, Diacypris compacts), 18 halophilics (e.g. Mytilocypris splendida, Trigonocypris globulosa, Microcyclops dengizicus) and many salt- tolerant freshwater forms, mainly insects. Overall, the fauna was distinctly Australian, but some prominent taxa found in southern salt lakes were absent and others were replaced by local endemics and tropical species. Past climatic cycles have probably influenced the composition of the fauna.

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Più fonti

Tesi sul tema "Salt lake ecology Australia"

Whitehead, Ayesha L. "The effects of isolation and environmental heterogeneity on intraspecific variation in Calamoecia clitellata, a salt lake-inhabiting copepod." University of Western Australia. School of Animal Biology, 2006. http://theses.library.uwa.edu.au/adt-WU2006.0092.

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[Truncated abstract] This study focussed on how isolation and environmental heterogeneity in salt lakes has influenced intraspecific variation in the calanoid copepod Calamoecia clitellata. Calamoecia clitellata relies on passive vectors for dispersal, and this, coupled with the insular nature of salt lakes, may promote genetic divergence at a molecular level. When contrasting environments are involved, genetic divergence may also occur at the life history level, possibly due to local adaptation. I examined the distribution of genetic variation among 14 populations in Western Australia using molecular genetic markers, and examined variation in life history traits among contrasting environments. To ascertain how isolation had influenced molecular genetic variation, I determined population genetic structure and used a phylogeographic approach to infer the impact of historical events. Environmentally induced variation was also evident in the field, with a switch from subitaneous egg production to resting egg production coinciding with changing environmental conditions. It is proposed that plasticity in life history traits has evolved in response to temporal environmental heterogeneity … It can be concluded that isolation in salt lakes in Western Australia has influenced molecular and phenotypic variation in C. clitellata in contrasting ways. At the molecular level, contemporary and historical isolation have promoted genetic divergence of populations, yet when coupled with environmental heterogeneity, marked phenotype plasticity has arisen. This study raises questions as to whether phenotype plasticity is a widespread phenomena in zooplankton found in temporary saline waters and an adaptive strategy to tolerate marked temporal environmental heterogeneity

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Cranney, Chad R. "Control of Large Stands of Phragmites australis in Great Salt Lake, Utah Wetlands." DigitalCommons@USU, 2016. https://digitalcommons.usu.edu/etd/4988.

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Phragmites australis (hereafter Phragmites) often forms dense monocultures, which displace native plant communities and alter ecosystem functions and services. Managers tasked with controlling this plant need science-backed guidance on how to control Phragmites and restore native plant communities. This study took a large-scale approach - to better match the scale of actual restoration efforts - to compare two herbicides (glyphosate vs. imazapyr) and application timings (summer vs. fall). Five treatments were applied to 1.2 ha plots for three consecutive years: 1) summer glyphosate; 2) summer imazapyr; 3) fall glyphosate; 4) fall imazapyr; and 5) untreated control. Dead Phragmites following herbicide treatments was mowed in the first two years. Efficacy of treatments and the response of native plant communities were monitored for three years. We report that fall herbicide applications were superior to summer applications. No difference was found between the two herbicides in their ability to reduce Phragmites cover. Plant communities switched from emergent to open water communities and were limited by Phragmites litter and water depth. Although, some plant communities showed a slow trajectory towards one of the reference sites, cover of important native emergent plants did not increase until year three and remained below 10%. These results suggest that fall is the best time to apply herbicides for effective large-scale control of Phragmites. Active restoration (e.g. seeding) may be needed to gain back important native plant communities. Methods to reduce Phragmites litter after herbicide applications should be considered.

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Long, Arin Lexine. "Distribution and Drivers of a Widespread, Invasive Wetland Grass, Phragmites australis, in Great Salt Lake Wetlands." DigitalCommons@USU, 2014. https://digitalcommons.usu.edu/etd/3869.

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Non-native invasive plant species can often have negative effects on native ecosystems, such as altered nutrient cycling, decreased habitat for wildlife, and outcompeting native plants. Around the Great Salt Lake (GSL), Utah, the invasive wetland grass Phragmites australis has become abundant in wetlands around the lake. Phragmites is replacing many native wetland plants provide important waterfowl habitat around the GSL. For successful management of Phragmites in GSL wetlands, it is important to know the current distribution of Phragmites, as well as areas that might be vulnerable to future invasion by Phragmites. To do this, we used multispectral aerial imagery to map the current distribution of Phragmites. We then created a model that statistically related the Phragmites distribution data to a suite of environmental predictor variables such as salinity, proximity to nutrient sources, or proximity to roads. Results from our model suggest that Phragmites is more likely to be found in wetland areas close to point sources of pollution, with lower elevations with prolonged inundation, and with moderate salinities. We used these results to identify areas around GSL that might be vulnerable to future invasion. Results from our study will assist wetlands managers in prioritizing areas for Phragmites monitoring and control by closely monitoring areas of prime Phragmites habitat.

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Boggs, Dimity. "Playas of the Yarra Yarra drainage system, Western Australia." University of Western Australia. School of Earth and Geographical Sciences, 2009. http://theses.library.uwa.edu.au/adt-WU2009.0074.

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This thesis examines playas as integrated ecosystems, through investigation of long- and short-term processes associated with playa geomorphology, hydrology and diatom ecology, in playas of the Yarra Yarra drainage system of Western Australia. This landscape approach was conducted at a range of scales and consequently revealed a level of heterogeneity not previously described in Australian playas. The key result and common thread linking the three facets of the playas investigated is the importance of hydroperiod in defining the playa environment. The morphology and distribution of playas are described and the results presented of an examination of potential mechanisms determining intra-system variability. Measurements of the physical attributes of the playas, including length, area, shape, density and orientation, were made through Geographic Information System analysis and detailed interpretation of aerial photography. Two main morphological groups are distinguished: small (<10 ha), elliptical to circular playas with a NNW-SSE orientation; and large (>30 ha), elongated playas. Regional patterns in geomorphic attributes are markedly different between the west and east sides of the system. The boundary between the two regions coincides approximately with rainfall distribution. In this respect, climate is an overarching driver of geomorphological variation but sub-catchment characteristics are also critical determinants. Littoral drift and segmentation processes that are common to coastal lagoons but not commonly described in playas were identified from visual interpretation of aerial photographs of spits, bars and cuspate shorelines. Six small playas, representing an hydrological continuum from mostly wet to mostly dry, were selected for investigation of their hydrology and diatom ecology, enabling assessment ii of the variability of hydrology, hydrochemistry and of the effects of different hydrological environments on the distribution of taxa. Hydroperiod was highly variable and central to determining playa geomorphology and biology. In the six playas it ranged from 19 to over 211 days, and filling frequency from 1 to 3 cycles between 2002 and 2004, reflecting rainfall and sub-catchment variability. Monitoring a series of nested piezometers revealed that the playas were net discharge points for ground water over the period of survey. However, small local vertical head variations indicate ground water does not discharge at the same rate across the playa surfaces and that playas may have short-lived phases of ground water recharge. Hydrochemically, the playas are typical of salt lakes in Australia. They displayed a wide range of salinity values, neutral to alkaline pH and ionic composition similar to sea water. It is postulated that the geochemical evolution of waters in the playas follows a pathway where low salinity recharge waters with dilute sea water salts progress to Na-Cl dominated brines through evaporative concentration. Surface waters showed an ionic dominance consistent with sea water with minor variations attributed to transitional phases in the geochemical evolution of the waters. Shallow ground waters showed a common and consistent pattern of ionic dominance: Na+ >Mg2+ >K+ >Ca2+ : Cl- >SO4 2- >HCO3 ->CO3 2-.

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De, Deckker P. "Australian Quaternary studies : a compilation of papers and documents submitted for the degree of Doctor of Science in the Faculty of Science, University of Adelaide /." Title page, contents and abstract only, 2002. http://web4.library.adelaide.edu.au/theses/09SD/09sdd299.pdf.

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Rohal, Christine B. "Invasive Phragmites australis Management in Great Salt Lake Wetlands: Context Dependency and Scale Effects on Vegetation and Seed Banks." DigitalCommons@USU, 2018. https://digitalcommons.usu.edu/etd/7228.

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Invasive plants can outcompete native plants, replacing diverse plant communities with monocultures, which can negatively impact the whole ecosystem. One invasive plant, Phragmites australis, has invaded wetlands across North America. In Utah’s Great Salt Lake, it has greatly reduced the area of native plants that are important habitat for migratory birds. Here we describe experiments that assess multiple treatments for Phragmites removal and evaluate the return of native plants after Phragmites management. The treatments were applied to Phragmites patches at two scales (small 1/4-acre plots and large 3-acre plots) and across multiple sites to evaluate how patch size and environmental differences can influence the plants that return after Phragmites removal. The treatments (applied over 3 years and monitored two more) compared two different herbicides (glyphosate and imazapyr) and different herbicide and mowing timings. The treatments evaluated in the large patch study were 1.) untreated control 2.) fall glyphosate, winter mow, 3.) summer imazapyr, winter mow, 4.) summer glyphosate, winter mow. The treatments evaluated in the small patch study included treatments 1-4 above plus 5.) summer mow, fall glyphosate, 6.) summer mow, then black plastic solarization. In the small patches, we also monitored the seeds in the soil to assess how Phragmites management treatments can change the densities of Phragmites and native seeds. Fall glyphosate treatments were superior for Phragmites cover reduction. After the initial treatment, summer herbicide and mow treatments reduced Phragmites seed production, while fall glyphosate did not. Phragmites seeds were plentiful in the soil but were reduced following three years of all herbicide treatments. Native plant recovery following Phragmites management was extremely variable across sites. Sites with high soil moisture had better Phragmites removal and more native plants. But when flooding was deep, native plants were rare. Native seed density in the soil did not change due to Phragmites management, but soil seed densities were different across sites, which influenced native plant recruitment. Phragmites was removed more effectively and native plants returned in greater numbers in small patches compared with large. This was because small patches were typically near established native plant communities, which likely provided more native plant seeds and had hydrology that was less disturbed by human activity. In sites where native plants do not return after Phragmites management, practitioners may need to try revegetation with native plant seeds to restore important native plant communities.

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Campagna, Veronica. "Limnology and biota of Lake Yindarlgooda - an inland salt lake in Western Australia under stress." Curtin University of Technology, Department of Environmental Biology, 2007. http://espace.library.curtin.edu.au:80/R/?func=dbin-jump-full&object_id=17473.

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Inland salt lakes of the arid and semi-arid zones of Western Australia are unique systems. An unpredictable rainfall pattern and a transient water regime ensure these lakes remain dry for much of the year. Lake Yindarlgooda in the Eastern Goldfields of Western Australia is a typical inland salt lake that has been subjected to additional stresses. This thesis is the outcome of investigations conducted on the lake from 2001 to 2003. Emphasis is on the limnology and biota of the lake, including an adjacent wetland, and impacts on the aquatic ecosystems caused predominantly by mining. Lake Yindarlgooda is a large, shallow hypersaline lake situated on the Yindarlgooda Palaeoriver. It is sodium chloride dominated and has naturally high background levels of nickel. Sites impacted by the leaching of hypersaline decant water from a leach residue storage facility (LRSF) were differentiated from control sites using multivariate statistics. Salinity was found to be a major determinant in the structure of the biological communities in the lake systems. Different biotic communities with low taxonomic diversity were recorded in Lake Yindarlgooda and Swan Refuge, a nearby hyposaline clay pan. The benthic microbial communities were dominated by halotolerant diatoms, notably Amphora coffeaeformis, Navicula incertata and Hantzschia baltica. Variation in the diatom assemblages between the playa sites and the clay pan were noted, influenced by habitat type and salinity. Within Lake Yindarlgooda, the diatom assemblages in the control and impact sites were found to be similar. A narrow salinity spectrum dictated the taxa present. Many of the benthic diatoms collected during the dry phase were encysted, having entered dormancy. The invertebrate fauna in Lake Yindarlgooda and Swan Refuge belonged to the Crustacea. A larger percentage of hyposaline invertebrate taxa were recorded from Swan Refuge, while those in Lake Yindarlgooda were typically halotolerant species. The Ostracoda showed the greatest diversity and their abundance was higher in the southern control sites while the Anostracan, Parartemia sp., dominated the northern impact sites of the playa. The riparian zone of Lake Yindarlgooda supported a diverse plant community, dominated by the Chenopodiaceae. The marginal vegetation communities along the shores of Lake Yindarlgooda were found to be similar, indicating habitat homeogeneity. Within the riparian zone both biological and physical soil crusts occupied large areas not inhabited by vascular plants. The biological soil crust identified was composed of an association between the filamentous cyanobacterium Microcoleus sp. and a moss species (Musci). Both biological and physical soil crusts were found to have functional roles in stabilising the surrounding low dunes. The soil crusts in the northern control sites were badly degraded as a result of trampling by livestock, while those in the southern control sites were protected and were intact. Only one Parartemia species was found to inhabit Lake Yindarlgooda, Parartemia n. sp. d. It was collected in salinities ranging from 50 to 140 g L-1. The population appeared to be oviparous, recruitment mostly from resting eggs. The male to female ratios varied between sites, as did the number of juveniles compared to the adults. The northern impact sites had a more mature Parartemia population than the southern control sites and appeared to have undergone a second recruitment. Examination of the surface sediment found a well established Parartemia “egg bank” in the northern impact sites with egg numbers much higher than in the southern control sites. The ultrastructure of the Parartemia resting egg was identical to that of Artemia. Differences in the external features and internal structure of the resting egg of Parartemia n sp. d and Parartemia n. sp g from Lake Miranda, another saline lake, were identified. This study showed morphological variation of the egg within Parartemia, a finding not previously recorded. Rehydration trials on the Parartemia egg bank indicated that the increase in sediment salinity from the LRSF had a negative effect on the hatching of the resting eggs. In salinities above 60 mS cm-1 hatching was less successful. The conditions provided in the trials were similar to those in Lake Yindarlgooda. The hatching technique was repeated on sediment from Lake Miranda with similar results. These trials were considered a valuable monitoring tool in the assessment of impacts on the biota of temporary lakes in the absence of water. This study demonstrated that in the absence of water the egg and spore/seed bank can be used as a proxy for monitoring temporary lakes. It was also found to be valuable in understanding the distribution and diversity of the biotic communities in Lake Yindarlgooda. This study provides the first integrated reference information on a Western Australian inland salt lake against which any future impact may be assessed.

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Campagna, Veronica S. "Limnology and biota of Lake Yindarlgooda - an inland salt lake in Western Australia under stress /." Full text available, 2007. http://adt.curtin.edu.au/theses/available/adt-WCU20071128.103345.

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Vest, Josh L. "Winter Ecology of Waterfowl on the Great Salt Lake, Utah." DigitalCommons@USU, 2013. https://digitalcommons.usu.edu/etd/2051.

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I designed a suite of studies in coordination with Utah Division of Wildlife Resources (UDWR) to evaluate waterfowl use of the GSL in winter and ecological aspects associated with GSL use. These studies provided insight into key information gaps previously identified by UDWR regarding management of GSL resources. Population surveys indicated total duck abundance was low when GSL surface elevations were low and wetland resources diminished because of persistent drought in the system. Also, ducks appear to use hypersaline parts of GSL more when freshwater habitats are limited from either drought or ice conditions. Common goldeneye, northern shoveler, and green-winged teal exhibited the most use of hypersaline areas. Dietary evaluations indicated all three species feed on hypersaline invertebrates from GSL to meet energetic and nutritional needs in winter. Brine shrimp cysts were important foods for northern shoveler and green-winged teal. Fat levels of ducks are important determinants of survival and fitness. Fat reserves of goldeneye were generally lower in the winter when both GSL and wetland habitat resources were lower. Results suggest brine fly larvae productivity, freshwater habitat availability, and temperature and wind speed likely play a more prominent role in goldeneye fat reserves than osmoregulation. Also, common goldeneye and northern shoveler using the GSL apparently accumulated biologically concerning amounts of mercury and selenium during winter. However, further research is needed to evaluate the effect of these elements on GSL ducks.

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Pendleton, Maya Cassidy. "Ecosystem Functioning of Great Salt Lake Wetlands." DigitalCommons@USU, 2019. https://digitalcommons.usu.edu/etd/7557.

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The Great Salt Lake (GSL) wetlands account for ~75% of all Utah wetlands and provide not only critical habitat for millions of migratory birds, but also provide valuable ecosystem functions and services as well as economic benefits to Utahns. However, these wetlands are facing an aggressive invader, Phragmites australis, that has spreading across the GSL wetlands and replacing native wetland habitats. Wetland managers have spent countless resources and time trying to control the spread of P. australis and restore GSL wetlands. However, we do not fully understand how these wetlands functions and services are being altered with this habitat homogenization because functional data for our wetland species have not been well documented. This lack of knowledge may hinder wetland restoration efforts. To create baseline functional data for the GSL wetland species and better understand how the spread of P. australis might be affecting the overall health of the system, I measured eight individual ecosystem functions for seven dominant habitat types found across the GSL wetlands. I compared these individual functions across habitat types as well as created two different multifunctionality indices using an averaging and a thresholds approach. With these comparisons, I was able to determine the distinct functional strengths of different wetland habitat types and their overall functional abilities. I found that functional abilities varied greatly by habitat type and that not one single habitat could support every function even at the lowest threshold measured. I found that Typha latifolia, Schoenoplectus acutus, and P. australis, had the highest multifunctional values. However, I also found that some habitats offered unique functions, such as Salicornia rubra and playa, and that these functions were lacking in other habitats, including the most multifunctional habitats. These findings suggest that maintaining habitat heterogeneity will be critical in ensuring a fully functioning wetland system that can provide a multitude of ecosystems services that benefit both humans and wildlife. The findings of this study will supply wetland managers with a better understanding of the functional strengths of different wetland habitats. This data will aid in ongoing restoration efforts by enabling managers to target certain functions and create more efficient and effective management plans.

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Libri sul tema "Salt lake ecology Australia"

Zhongguo yan hu sheng tai xue. Beijing: Ke xue chu ban she, 2010.

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Jammes, Lois. El Salar de Tunupa (Salar de Uyuni). Santa Cruz de la Sierra, Bolivia: Armonía, 2000.

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Chalar, Jhonny Plata. El Salar de Uyuni. La Paz, Bolivia: Fondo Editorial de los Diputados, 2002.

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Paul, Don S. 1997 Great Salt Lake eared grebe photo survey. Salt Lake City, Utah: Great Salt Lake Ecosystem Project, Utah Division of Wildlife Resources, 1999.

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Saline lake ecosystems of the world. Dordrecht: Dr. W. Junk Publishers, 1986.

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Oglesby, Larry C. The Salton Sea: Geology, history, potential problems, politics, and possible futures of an unnatural desert salt lake. [Los Angeles, Calif.]: Southern California Academy of Sciences, 2005.

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International Symposium on Inland Saline Lakes (3rd 1985 Nairobi, Kenya). Saline lakes: Proceedings of the Third International Symposium on Inland Saline Lakes, held at Nairobi, Kenya, August 1985. Dordrecht: W. Junk, 1988.

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International, Conference on Salt Lakes (7th 1999 Death Valley National Park Calif and Nev ). Saline lakes: Publications from the Seventh International Conference on Salt Lakes, held in Death Valley National Park, California, U.S.A., September 1999. Dordrecht: Kluwer Academic Publishers, 2001.

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Paul, Don S. Great Salt Lake waterbird survey: 1997 and 1998 seasons. Salt Lake City, Utah: Great Salt Lake Ecosystem Project, Utah Division of Wildlife Resources and Waterbird Survey Cooperators, 1999.

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Capitoli di libri sul tema "Salt lake ecology Australia"

Bulatov, V. I., I. N. Rotanova, and D. V. Chernykh. "Landscape ecology and cartographical analysis of natural salt complexes in the south west Siberia Basins of Lake Chany and Lake Kulundinskoye." In Sabkha Ecosystems, 233–47. Dordrecht: Springer Netherlands, 2006. http://dx.doi.org/10.1007/978-1-4020-5072-5_19.

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Williams, W. D., and M. J. Kokkinn. "The biogeographical affinities of the fauna in episodically filled salt lakes: A study of Lake Eyre South, Australia." In Saline Lakes, 227–36. Dordrecht: Springer Netherlands, 1988. http://dx.doi.org/10.1007/978-94-009-3095-7_17.

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Kulshreshtha, Seema, B. K. Sharma, and Shailja Sharma. "The Ramsar Sites of Rajasthan: Ecology and Conservation of Sambhar Salt Lake, Jaipur and Keoladeo National Park, Bharatpur." In Faunal Heritage of Rajasthan, India, 173–219. Cham: Springer International Publishing, 2013. http://dx.doi.org/10.1007/978-3-319-01345-9_8.

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"Effects of Urbanization on Stream Ecosystems." In Effects of Urbanization on Stream Ecosystems, edited by Cathy M. Tate, Thomas F. Cuffney, Gerard McMahon, Elise M. P. Giddings, James F. Coles, and Humbert Zappia. American Fisheries Society, 2005. http://dx.doi.org/10.47886/9781888569735.ch17.

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Abstract.—To assess the effects of urbanization on assemblages (fish, invertebrate, and algal), physical habitat, and water chemistry, we investigated the relations among varying intensities of basin urbanization and stream ecology in three metropolitan areas: the humid northeastern United States around Boston, Massachusetts; the humid southeastern United States around Birmingham, Alabama; and the semiarid western United States around Salt Lake City, Utah. A consistent process was used to develop a multimetric urban intensity index (UII) based on locally important variables (land-use/land-cover, infrastructure, and socioeconomic variables) in each study area and a common urban intensity index (CUII) based on a subset of five variables common to all study areas. The UII was used to characterize 30 basins along an urban gradient in each metropolitan area. Study basins were located within a single ecoregion in each of the metropolitan areas. The UII, ecoregions, and site characteristics provided a method for limiting the variability of natural landscape characteristics while assessing the magnitude of urban effects. Conditions in Salt Lake City (semiarid climate and water diversions) and Birmingham (topography) required nesting sites within the same basin. The UII and CUII facilitated comparisons of aquatic assemblages response to urbanization across different environmental settings.

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"cent in children, but the length of residence in the Ord River area was an important determinant, with those who had lived in the area fewer than three years having a lower incidence (26 per cent) than those who had lived in the area for more than three years (64 per cent) (Liehne et al. 1976c). Thus these early results demonstrated that the mosquito density and bird numbers had increased since the establishment of the Ord River irrigation project, particularly around the diversion dam and Lake Kununurra, that the major mosquito vector of MVE virus was the predominant species Culex annulirostris, and that MVE virus was actively circulating in the area. However, the serological results must be treated with caution as the HI test cannot differentiate clearly between MVE and Kunjin viruses, and therefore a number of seroconversions may have been due to infection with the latter. Nevertheless, the results suggested that MVE virus may have become enzootic in the Ord River irrigation area. A single case of Australian encephalitis occurred in Kununurra in 1974; this was the last case of the 1974 epidemic that affected all Australian mainland states (Table 8.1). The first cases to be reported in the Northern Territory also occurred during the 1974 epidemic. 8.3.2 Studies carried out between 1977 and 1995 The early studies between 1972 and 1976 laid the foundation for the more detailed investigations of MVE virus ecology in north-western Australia that have been undertaken over the past twenty years. These investigations became increasingly important as cases of Australian encephalitis became more frequent, particularly with respect to surveillance methodology to enable early warnings to be given of impending epidemic activity and to understand the spread and possible persistence of the virus. In addition, the apparently ideal conditions for arboviral ecology in the Ord River irrigation area have made it essential to monitor for possible incursant mosquito vector species and viruses that could potentially become established in the region. Improved methods for mosquito collection, virus isolation, and antibody detection have been introduced over the past twenty years, which have allowed a more accurate picture to emerge of the ecology of MVE virus and a more effective surveillance system to be established to provide an early warning of increased virus activity. Human cases of Australian encephalitis, surveillance for virus activity, virus isolations, factors affecting mosquito populations, and virus spread and persistence are discussed below. Human encephalitis cases Increasing numbers of Australian encephalitis cases have occurred in Western Australia and the Northern Territory since 1977 (Mackenzie and Broom 1995; Mackenzie et al. 1993a; Smith et al. 1993). Indeed the majority of cases reported in Australia since 1977, thirty of." In Water Resources, 130. CRC Press, 1998. http://dx.doi.org/10.4324/9780203027851-23.

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