Relevant bibliographies by topics / Herbivore grazing

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers

Academic literature on the topic 'Herbivore grazing'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "Herbivore grazing"

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Milchunas, D. G. "Plant community dynamics in shortgrass steppe with grazing relaxation and imposition by large and small herbivores." Israel Journal of Ecology and Evolution 57, no. 1-2 (May 6, 2011): 23–41. http://dx.doi.org/10.1560/ijee.57.1-2.23.

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Semiarid rangelands often respond slowly to rest/relaxation of grazing pressure by large herbivores, and the effects of grazing are most often inferred from this direction of study because the imposition of grazing onto previous ungrazed/lightly grazed areas occurred prior to the age of scientific studies. These rangelands host a diversity of small and large herbivores, but grazing studies most often concern effects of the large generalists. Here, the effects of herbivore body size on plant species richness and dominant species, and imposition and relaxation of grazing by large herbivores were studied by opening half of exclosures established in 1939 and building new exclosures to large herbivores, and to small-plus-large herbivores. Plant richness using sensitive species-area sampling was studied in a dry and a wet year, about 62 years after initiating the long-term experiment and about 6-10 years after initiating the altered designs. Convergence of the newly opened to large herbivore grazing treatment to the long-term grazed treatment occurred within 10 years, but convergence of the newly excluded to large herbivore treatment to the long-term excluded treatment had only partly occurred. This indicated that recovery from grazing is slow relative to imposition of grazing by large herbivores, but effects of the additional exclusion of small-plus-large herbivores occurred relatively rapidly. These results were mirrored by trajectories of convergence of the dominant species, and this is discussed with respect to implications for state-and-transition models. Short-term exclusion of small-plus-large herbivores resulted in greater richness than even long-term exclusion of only large herbivores, even though quantities consumed by small herbivores are much less than by large. Grazing effects on plant richness were large in the wet year, but the very dry year suppressed richness on all treatments. When sampling effort and area are the same, the numbers and attributes of species unique to a treatment are indicators of rareness of the richness and traits selected for by the treatment. More unique species were sampled in the small-plus-large herbivore exclosures when comparing body size, and the long-term large herbivore exclosures when comparing time of exclosure. Unique species encountered during sampling the ungrazed treatments were generally forbs, exotic and/or weedy invasive species, and often tall, annual species.
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Potter, Arjun B., Muhammad Ali Imron, Satyawan Pudyatmoko, and Matthew C. Hutchinson. "Short-term plant-community responses to large mammalian herbivore exclusion in a rewilded Javan savanna." PLOS ONE 16, no. 7 (July 22, 2021): e0255056. http://dx.doi.org/10.1371/journal.pone.0255056.

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Grassy biomes such as savannas are maintained by an interacting suite of ecosystem processes from herbivory to rainfall to fire. Many studies have examined the impacts of large mammalian herbivores on herbaceous plant communities, but few of these studies have been conducted in humid, fertile savannas. We present the findings of a short-term experiment that investigated the effects of herbivory in a fertile, humid, and semi-managed savanna. We erected large-herbivore exclosures in Alas Purwo National Park, Java, Indonesia where rainfall is high and fire is suppressed to test how herbivores impact plant community development across the growing season. Where large mammalian herbivores were excluded, herbaceous plant communities contained more non-grasses and were less similar; diverging in their composition as the growing season progressed. Effects of herbivore exclusion on plant species richness, evenness, and biomass per quadrat were generally weak. Notably, however, two weedy plant species (one native, Imperata cylindrica and one introduced, Senna cf. tora) appeared to benefit most from herbivore release. Our results suggest that heavy grazing pressure by native large mammalian herbivores controlled the composition of the herbaceous plant community. Moreover, exclusion of large mammalian herbivores led to divergence in the plant species composition of exclosures; compositional dissimilarity between herbivore-exclusion plots was higher than between plots exposed to large mammalian herbivores. Our findings suggest that, at this high-rainfall site, large mammalian herbivores constrained the developmental trajectory of plant communities across the growing season.
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Faast, Renate, and José M. Facelli. "Grazing orchids: impact of florivory on two species of Caladenia (Orchidaceae)." Australian Journal of Botany 57, no. 4 (2009): 361. http://dx.doi.org/10.1071/bt08140.

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Herbivory is considered a major threat in many of the orchid-species recovery plans in Australia. Kangaroos and rabbits are the most commonly implicated herbivores; however, no studies have attempted to confirm their role. Regular monitoring of several populations of Caladenia rigida R.S.Rogers and C. tentaculata Schldl. during 3 years in the Mount Lofty Ranges, South Australia, revealed that up to 94% of flowers and 36% of seed capsules were browsed, whereas leaf herbivory was less prevalent. Furthermore, patterns of herbivory varied markedly among sites and across years. In two seasons, predation of C. rigida flowers inside a kangaroo- and rabbit-proof exclosure was equal to or higher than outside the exclosure. Florivory within populations was influenced by proximity to the habitat edge, although the direction of this response differed among sites. Various types of mesh cages were erected around plants to elucidate the size and type of herbivores. Plants protected from florivores were almost three times more likely to produce seed than were exposed plants; however, some cage types reduced pollination. Video surveillance confirmed the role of the white-winged chough, Corcorax melanorhamphos, as a florivore. The present study is the first one to identify a herbivore unequivocally, quantify the intensity and extent of floral herbivory across a range of populations, and assess the potential cost of florivory to the direct reproductive output of orchids.
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Bakker, E. S., H. Olff, and J. M. Gleichman. "Contrasting effects of large herbivore grazing on smaller herbivores." Basic and Applied Ecology 10, no. 2 (March 2009): 141–50. http://dx.doi.org/10.1016/j.baae.2007.10.009.

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Graham, Mark D., and Rolf D. Vinebrooke. "Trade-offs between herbivore resistance and competitiveness in periphyton of acidified lakes." Canadian Journal of Fisheries and Aquatic Sciences 55, no. 4 (April 1, 1998): 806–14. http://dx.doi.org/10.1139/f97-309.

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It was hypothesized that herbivores regulate periphyton succession in acidified lakes by suppressing loosely attached filamentous algae that otherwise persist and outcompete other growth forms for resources, such as dissolved inorganic carbon (DIC). This hypothesis was tested by conducting grazer-exclosure experiments over an ice-free season in acidified and circumneutral lakes that differed in DIC concentrations. In each lake, the two-factor experimental design had two herbivore (presence-absence) and five succession (early-late) treatments. Total periphyton biomass was greater and significantly suppressed by herbivores in the circumneutral lake. Here, acid-sensitive green frog (Rana clamitans) tadpoles suppressed loosely attached (i.e., zygnematacean taxa) while stimulating firmly attached (i.e., Coleochaete scutata) algae, causing succession towards a herbivore-resistant physiognomy. Conversely, a loosely attached and tall physiognomy persisted in the absence of significant grazing and greater resource limitation in the acid lake. Our findings suggest that trade-offs between competitiveness and herbivore resistance help predict changes in periphyton in recovering acidified lakes. During recovery, concomitant increases in herbivory and resources should favour a firmly attached and short periphyton physiognomy that is resistant to removal by herbivores, but that lacks the competitiveness of loosely attached and tall forms in DIC-limited acid lakes.
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Fröberg, Lars, Anette Baur, and Bruno Baur. "Field study on the regenerative capacity of three calcicolous lichen species damaged by snail grazing." Lichenologist 38, no. 5 (August 22, 2006): 491–93. http://dx.doi.org/10.1017/s0024282906005469.

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Lichen growth and regeneration depend on the net photosynthetic production, the lateral allocation of products, on abiotic factors, competition and herbivory, and may therefore vary both in space and time (Hill 1981). Herbivores cause different damage to lichens in response to different thallus structure (surface toughness) and growth form, presence/absence of secondary compounds, and due to herbivore-specific differences in feeding (Lawrey 1984; Fröberg et al. 1993; Baur et al. 1994; Hesbacher et al. 1995). Regeneration of artificially damaged lichen tissue has been investigated in detail, for example in Xanthoria parietina (L.) Th. Fr. (Honegger 1996; Honegger et al. 1996). However, quantitative assessments of the regenerative capacity of thalli damaged by herbivores are so far lacking. Damage to lichens by grazing gastropods is made by highly specialized radulae and can therefore not be imitated by any mechanical treatment (Baur et al. 2000). Herbivory by snails also involves the production of saliva and mucus, which both could affect lichen regeneration.
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Reķe, Agnese, Anita Zariņa, and Ivo Vinogradovs. "MANAGEMENT OF SEMI-WILD LARGE HERBIVORES’ GRAZING SITES IN LATVIA." ENVIRONMENT. TECHNOLOGIES. RESOURCES. Proceedings of the International Scientific and Practical Conference 1 (June 20, 2019): 241. http://dx.doi.org/10.17770/etr2019vol1.4082.

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Large herbivores were a common part of European nature in the pre-agrarian times. With the development of farming and over-hunting, the number of wild large herbivores rapidly decreased. Wild horses and cattle became extinct. In the 1920-30’s, scientists created two new herbivore breeds that resembled the extinct aurochs and tarpans - Heck cattle and Konik horses. Nowadays the introduction of Heck cattle, Konik horses and other similar large herbivore breeds is widely used in specially protected nature territories (SPNT) as a strategic answer to the question – what should we do with the agricultural lands that have lost their economical meaning. Since 1999, semi-wild large herbivores are introduced in various SPNT of Latvia as well, mainly in nature parks and nature reserves. Based on field visits, interviews and policy analysis, this paper discusses two main approaches to semi-wild grazing animal population management in Latvia: (1) introduced herbivores as a part of rewilding process and (2) introduced herbivores as instruments for habitat protection. The former represents the implementation of western wilderness values, while the latter is related to more specific protection of species and habitats according to particular place-based nature protection goals. This study contributes to the growing discussion on rewilding practises in Europe and the introduction ideas of semi-wild animals, as well as landscape management practices in the era of post-productivism.
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Tallowin, J. R. B., A. J. Rook, and S. M. Rutter. "Impact of grazing management on botanical diversity of grasslands." Proceedings of the British Society of Animal Science 2005 (2005): 244. http://dx.doi.org/10.1017/s1752756200011558.

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Grazing is a natural process affecting the composition and structure of plant communities and is widely considered to be an essential nature conservation tool. However, our understanding of the interrelations between grazing by large herbivores and biodiversity is relatively poor. Nature conservation imperatives, to control succession, for example, mean that practice has moved ahead of the science knowledge base on grazing. This gap now needs to be bridged. Improving our understanding of and ability to predict consequences of manipulating grazing pressure, duration, type and/or mix of large herbivore on biodiversity outcomes are particular issues that we are addressing.
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Kirkpatrick, J. B., and K. L. Bridle. "Comparative Effects of Stock and Wild Vertebrate Herbivore Grazing on Treeless Subalpine Vegetation, Eastern Central Plateau, Tasmania." Australian Journal of Botany 47, no. 6 (1999): 817. http://dx.doi.org/10.1071/bt98029.

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The existence of two 25-year-old grazing exclosures on Liawenee Moor, Eastern Central Plateau, Tasmania, created an opportunity to investigate the impacts of vertebrate herbivores on treeless subalpine vegetation. There were three treatments: sheep-, native herbivore- and rabbit-grazed; native herbivore- and rabbit-grazed; no grazing. The amount of bare ground was highest in the sheep-grazed plots, while vegetation cover was greatest in the ungrazed exclosure. The cover of all lifeform groups, except small herbs, was greater in the exclosures than in the sheep-grazed plots. The percentage frequency of tall herbs was significantly less in the sheep-grazed plots than either of the grazing exclosures. Tall herbs were more likely to be found under the canopy of other vegetation in the sheep-grazed plots while the same species were found to be growing in locations with no other vegetation cover in the ungrazed exclosure. Revegetation of bare ground averaged 1% per year over a 20-year period in the ungrazed exclosure. While percentage bare ground has also decreased in the native- and rabbit-grazed exclosure, it has increased in the sheep-grazed plots. Domestic stock grazing appears to have a much greater impact on vegetation cover, species composition and community structure than grazing by native herbivores and rabbits. No grazing allows for the fastest rehabilitation of the area. Our results are consistent with those from alpine and treeless subalpine areas of the Australian mainland.
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Eynaud, Yoan, Dylan E. McNamara, and Stuart A. Sandin. "Herbivore space use influences coral reef recovery." Royal Society Open Science 3, no. 6 (June 2016): 160262. http://dx.doi.org/10.1098/rsos.160262.

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Herbivores play an important role in marine communities. On coral reefs, the diversity and unique feeding behaviours found within this functional group can have a comparably diverse set of impacts in structuring the benthic community. Here, using a spatially explicit model of herbivore foraging, we explore how the spatial pattern of grazing behaviours impacts the recovery of a reef ecosystem, considering movements at two temporal scales—short term (e.g. daily foraging patterns) and longer term (e.g. monthly movements across the landscape). Model simulations suggest that more spatially constrained herbivores are more effective at conferring recovery capability by providing a favourable environment to coral recruitment and growth. Results also show that the composition of food available to the herbivore community is linked directly to the pattern of space use by herbivores. To date, most studies of variability among the impacts of herbivore species have considered the diversity of feeding modes and mouthparts. Our work provides a complementary view of spatial patterns of foraging, revealing that variation in movement behaviours alone can affect patterns of benthic change, and thus broadens our view of realized links between herbivore diversity and reef recovery.
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Dissertations / Theses on the topic "Herbivore grazing"

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Smith, Lesley Anne. "Herbivore grazing decisions in relation to parasites in the environment." Thesis, University of York, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.444692.

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Holland, John Peter. "Plant herbivore interactions within a complex mosaic of grassland, mire and montane communities." Thesis, University of Glasgow, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.342041.

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Wilkie, Martin. "Mixed herbivore grazing on a lowland heath system : quantifying the collective impacts for conservation management." Thesis, University of Southampton, 2013. https://eprints.soton.ac.uk/355885/.

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Degradation of terrestrial habitats with high conservation value has resulted in strategic efforts to cease or reverse their declines. Broad habitat management can restore ecological processes and large herbivores can provide ecological function in some terrestrial systems. Following years of decline and fragmentation, owing to factors such as cessation of traditional practices, lowland heathland has become an internationally important habitat with strategic protection. Free-ranging grazing aims to assist in mitigating such losses to habitat and vegetation communities, but quantifying the grazing regime and its associated impacts is necessary to ensure protection of these vulnerable systems. Reviews of herbivore impacts on lowland heath provide detailed evaluations and recognise the absence of experimental assessments and baseline monitoring. This research aimed to assess ecological activity and impacts (herbage removal, trampling and dunging) of horses and cattle on a lowland heath system to determine their influence on changing vegetation and to inform grazing management. This mixed regime is commonly adopted for restoration of semi-natural habitats but a failure to understand the separate vegetation impacts can be detrimental for the system as a whole. Behavioural activity was quantified using scan-sampling assessing spatial and temporal variation in behaviour, habitat selection and niche overlap, spatial occupancy and diet. A factorial design was set up to quantify the impacts of herbage removal, trampling and dunging to vegetation separately. Assessments vegetation community composition and architecture in treatment and control areas were undertaken. Analyses incorporated non-parametric and general linear models. Animals utilised their environments in different ways, varying for feeding and showed high habitat selectivity, based on physiology and foraging strategy primarily. Herbage removal strongly influenced vegetation architecture and heterogeneity owing to selection for graminoids and the plants’ competitive traits; effects on other plants were not as well defined due to minimal abundance. Trampling modified the vegetation structure due to reduced canopy density maintaining colonising gaps, but increased graminaceous cover and showed a capacity for lateral expansion. Dunging regime was highly influential for enhancing plant architecture and modified vegetation composition based on nutrient availability and competition. Worming regime was influential on architectural parameters and may be due to retarded dung degradation; further research is required. The findings contributed knowledge to lowland heath grazing management, validating the use of mixed regimes at low densities, for generating vegetation heterogeneity, for the control of dominating plants and for understanding the impacts of different animal-management practices. Expanding the reach of this research to comparable systems is necessary to develop the knowledge of grazing-management impacts. The work addressed an absence of experimental evaluation on these systems and also illustrated the importance of separately quantifying the impacts of large herbivores.
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Parsons, Malcolm. "Herbivore pressure of reindeer, rodents and invertebrates in the Fennoscandian tundra: a comparison of three methods." Thesis, Umeå universitet, Institutionen för ekologi, miljö och geovetenskap, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-125917.

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Estimating herbivore density is an important part of understanding their impact on vegetation.  Many studies have been carried out on the impact of reindeer and other herbivores on arctic and sub-arctic vegetation, but they are difficult to compare as they typically use different methods to estimate herbivore activities.  The aim of this study was to compare three methods that were based on the recent International Tundra Experiment herbivory protocol to measure the activities of three herbivore groups: reindeer, rodents and invertebrates. The robustness of the methods themselves was then evaluated.  Fieldwork was carried out at 12 sites in the Fennoscandian mountain area, with controls inside reindeer exclosures.  The results showed that the methods were the most robust when measuring reindeer activities.  The reindeer measurements were also well correlated with a reindeer-density estimate calculated from official reindeer population data.  This study recommends considering the use of photographs to increase the time-efficiency of pellet-counts.  The rodent activity estimates were good, but the patterns inside exclosures differed to the patterns outside exclosures.  The results for invertebrates were deemed to be less reliable as the measurements for one method were not recorded at an appropriate scale.  In conclusion, the findings of this study will help improve the comparability of future studies on the impact of reindeer herbivory and other herbivores, and gives suggestions for more accurate ways of measuring herbivore pressure in arctic and sub-arctic vegetation.
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Diner, Brandee. "Plant-herbivore interactions between North American porcupines (Erethizon dorsatum) and trembling aspens (Populus tremuloides)." Thesis, McGill University, 2005. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=84024.

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Plant-herbivore interactions play a significant role in the structure and functioning of ecosystems. Co-evolutionary theory suggests that plant defenses evolved due to herbivores and herbivore pressure can shape the genetic composition of their food resources. We used interactions between North American porcupines (Erethizon dorsatum) and trembling aspens ( Populus tremuloides) as a system to investigate this theory's important assumption that herbivores select food sources based on genetically controlled traits. We confirmed that porcupines exhibit intra-specific food selection and that this is linked to the genetic composition of the aspens. We also demonstrated that variation in phenolic glycosides and condensed tannins are strong components of this selection, thereby creating an important link between genetics, plant chemistry, and mammalian herbivory. We investigated potential impacts of porcupine herbivory on aspen using fluctuating asymmetry, however we did not detect any stress on heavily eaten trees, thereby questioning the validity of this tool for this study system.
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Madden, Christine. "The impacts of indigenous herbivore grazing over five years (2004 - 2008) on vegetation dynamics in four distinct vegetation types of the winter-rainfall Little Karoo." Bachelor's thesis, University of Cape Town, 2008. http://hdl.handle.net/11427/26304.

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Vegetation in semi-arid regions is subject to change when heavily utilised by herbivores. Changes in species richness, species and growth form composition, total cover and plant palatability in response to rest (fenced) and grazing (open) treatments was investigated in Sanbona Wildlife Reserve over five years (2004-2008). This reserve is over 55 000 ha and has four dominant vegetation types: Little Karoo Quartz Vygieveld, Western Little Karoo, Montagu Shale Renosterveld and previously transformed Renosterveld classified here as Old Lands. There was no significant change in vegetation dynamics between the fenced or open plots. There were significant differences between years in some vegetation types. All vegetation types showed both treatments having similar shifts in floristic composition. Floristic composition deviated the greatest in 2008 in all vegetation types. This was attributed to an increase in summer and winter rainfall in 2008, as all plots were similarly affected. There was no observed impact of herbivores although disturbance from small rodents and baboons was observed in a few plots. The lack of detectable difference between the fenced and open sites was attributed to low stocking rates, good rainfall and insufficient time.
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Forslund, Helena. "Grazing and the geographical range of seaweeds : The introduced Fucus evanescens and the newly described Fucus radicans." Licentiate thesis, Stockholms universitet, Botaniska institutionen, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-36255.

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Along the coast of temperate oceans brown algae of the genus Fucus form dense stands on rocky shores and are keystone species of the coastal ecosystem. These large seaweeds are perennial and function as substrate for many sessile marine organisms, provide shelter for fauna and juvenile fish, and are food source. A number of abiotic (e.g. wave-exposure, salinity and substrate) and biotic (e.g. herbivory and competition) factors structures these communities and determines the abundance and composition of fucoids at each specific site. Earlier studies have shown that herbivores may reduce growth of fucoids, thus affecting their distribution, and at high densities eliminate the species from previously occupied sites. In my thesis I focused on investigating herbivore-seaweed interactions and whether such interactions could influence the geographical range limits of Fucus species. A set of laboratory bioassays and a field survey were conducted (1) to investigate the resistance to grazing by a generalist gastropod between introduced (to Sweden) and native (Iceland) Fucus evanescens (Paper I),  (2) to study the distribution pattern of F. radicans and F. vesiculosus along the Swedish coast and specifically the southern limit of F. radicans, (3) to examine the abundance of herbivores in these two species, and (4) to test the hypothesis that Idotea baltica may contribute to restrict F. radicans to the Bothnian Sea (objective 2-4; Paper II). Fucus evanescens, a species that was introduced to the Swedish coast about 100 years ago, was found to be more resistant to grazing by L. littorea compared to F. evanescens from the native Icelandic populations.  It was also shown to contain a higher amount of phlorotannins; a putative chemical defence to herbivory. This indicates that development of resistance to herbivory could be important for a successful introduction and survival in a new range. No gradual change in the proportion, measured as % cover of either F. radicans or F. vesiculosus was found inside the range of F. radicans and its southernmost limit was abrupt without any corresponding abrupt change in any abiotic factor, e.g. salinity. Herbivores, i.e. Idotea spp., Gammarus spp. and Theodoxus fluviatils were found to be more abundant in F. radicans than in F. vesiculosus thalli indicating a habitat preference for F. radicans.  Further, Idotea baltica, whose range only overlaps with that of F. radicans in the south, was shown to prefer F. radicans over F. vesiculosus, possibly due to its lower content of phlorotannins. Based on these findings I propose that Idotea species may contribute in restricting the southern range of F. radicans, although further experiments, especially regarding competition with the larger F. vesiculosus need to be performed. In conclusion, biotic interactions e.g. the ability of to resist herbivore grazing by e.g. high phlorotannin content or having a structure less attractive as habitat to herbivores may be of importance in determining the geographic range of fucoids.
Längs kusterna i de tempererade haven bildar brunalger av släktet Fucus täta bestånd på klippiga stränder och är ofta nyckelarter i kustekosystemen. Dessa tångarter är fleråriga och utgör substrat för många fastsittande organismer, ger skydd åt små rörliga djur och fiskyngel, samt utgör föda för betare så som gastropoder, amphipoder och isopoder. Faktorer som vågexponering, bottentyp, salthalt, näringshalter, bete och konkurrens strukturerar tångsamhällen och avgör hur vanlig varje tångart är på en viss lokal. I min avhandling har jag fokuserat på interaktionen mellan betare och tång, samt hur viktig denna interaktion är för att avgöra den geografiska utbredningen av tångarter. Tidigare studier har visat att betare kan minska tillväxten hos tång och på så sätt påverka dess utbredning. I höga densiteter kan de beta ner hela bestånd av tång så att den försvinner från lokaler där de tidigare vuxit. Resistens mot bete hos Fucus evanescens, ishavstång, som är introducerad till Skagerrak, Kattegat och sydvästra Östersjön och inhemsk i norra Atlanten och norra Stilla Havet undersöktes i betesförsök (Artikel I). En betare, generalisten Littorina littorea, strandsnäcka, som är inhemsk i Sverige, dit F. evanescens har introducerats, föredrog att äta F. evanescens från Island där den är inhemsk, framför F. evanescens från Sverige. Det här skulle kunna tyda på att ett välutvecklat försvar är viktigt för att alger som blir introducerade till nya områden ska kunna etablera sig i det nya området. Jag undersökte även utbredningen av den nyligen beskrivna tångarten Fucus radicans, smaltång (Artikel II). Resistensen mot betare hos F. radicans jämfördes med resistensen mot bete hos F. vesiculosus, blåstång, som växer tillsammans med F. radicans, genom att undersöka preferensen mellan de två arterna hos Idotea baltica, tånggråsugga (Artikel II). Det fanns ingen gradient i förekomsten av F. radicans eller F. vesiculosus inom F. radicans utbredningsområde. Istället observerades en ganska abrupt gräns för utbredningen av F. radicans i söder. Eftersom I. baltica, vars utbredning överlappar F. radicans utbredning i söder, föredrog att äta F. radicans framför F. vesiculosus, skulle F. radicans utbredning kunna påverkas av I. baltica. Både I. baltica och två andra betare, Gammarus spp. och Theodoxus fluviatilis, var vanligare i F. radicans än i F. vesiculosus i plantor insamlade i fält. Det innebär att de vanligaste betarna, även i fält, föredrar att uppehålla sig i F. radicans och antagligen konsumerar mer av F. radicans. Slutsatsen från de båda studierna är att betare och tångens försvar mot bete har potentialen att påverka utbredning av olika tångarter.
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Reinecke, Jennifer [Verfasser], Karsten [Gutachter] Wesche, and Christine [Gutachter] Römermann. "The return of the mammoth steppe? : Rewilding in northeastern Yakutia and the actual impact of large herbivore grazing on vegetation / Jennifer Reinecke ; Gutachter: Karsten Wesche, Christine Römermann." Dresden : Technische Universität Dresden, 2020. http://d-nb.info/1227833555/34.

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Brown, Glen, and n/a. "Towards an in situ technique for investigating the role nutrients play in epilithon growth in an Australian upland stream." University of Canberra. School of Resource, Environmental & Heritage Sciences, 2001. http://erl.canberra.edu.au./public/adt-AUC20060614.171246.

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There is limited knowledge and understanding of the role of nutrients and effect of herbivore grazing on epilithon production in Australian upland rivers. Before investigating these processes, a method was required that will allow the study of factors (physical, chemical and biological) that affect epilithon abundance and distribution in lotic systems. The Thredbo River, Kosciusko National Park, New South Wales, provided an opportunity to conduct this investigation because it: is relatively undisturbed; has been intensely studied; is easily accessed; and is of appropriate width and depth to conduct in-stream experiments. The specific goals of this research were the: (1) validation of the nutrient-diffusing substrate method for investigating epilithon responses to nutrients; (2) development of experimental channels in which to investigate nutrient/epilithon dynamics in an upland stream; (3) development of a method to inhibit macroinvertebrate grazing from in situ experimental channels, so that epilithon responses to nutrients with and without grazing pressure can be studied; and (4) assessment of the ecological implications of nutrient/ epilithon/macroinvertebrate interactions assessed from in-stream experiments. Major achievements of my research, that advance the study of stream ecology, are as follows: · The investigation of the features of nutrient release from terracotta nutrientdiffusing substrates showed that phosphorus does not readily diffuse through terracotta clay, probably because terracotta contains known binding agents for phosphorus, such as iron, and because pores are easily blocked. I concluded that this type of substrate is inappropriate for studying nutrient dynamics and epilithon responses to the nutrient(s) limiting growth. The outcomes of this research has implications for future research using nutrient-diffusing substrates, and of how nutrient limitation information is interpreted from past research using terracotta nutrient-diffusing substrates. · I designed and tested in-stream experimental channels that were functional and provided near natural conditions for studying the interactions between nutrients/ epilithon/macroinvertebrates, without affecting physical variables not tested for. The in situ method developed was successful in simulating 'real world' complexities. Clay paving bricks were used as standardized common surface for community development because their colour, size and surface texture are similar to those of natural stones. · I developed a technique for successfully inhibiting macroinvertebrate grazing from designated areas, using electricity, without affecting flow and light. This technique will enable in-stream herbivory studies to assess the effects of macroinvertebrate grazing pressure on epilithon under natural conditions, including variability in flow, temperature, light and nutrients. It will allow the vexed question of whether epilithon biomass is controlled by bottom-up or top-down processes to be objectively addressed. The construction of in situ experimental channels that simulate natural conditions, combined with the non-intrusive methods of macroinvertebrate exclusion and nutrient addition, resulted in a study design that will facilitate the investigation of biotic responses to nutrients in Australian upland streams. Using the method developed, I showed that variable flows in the upper Thredbo River appear high enough to slough epilithon, but not high enough to dislodge macroinvertebrates. This may mean that in systems such as the Thredbo River that experience frequent low level disturbance, the epilithon is unable to reach equilibrium. There is strong top-down control of epilithon in this stream, with nutrients, temperature and light playing a secondary role. I concluded that natural variability may be more important than previously considered and perhaps this, rather than constancy, should be studied. This thesis adds support to the continuance of multiple factor investigations, and advocates that such studies be conducted under natural conditions so that the results are more relevant to natural systems than from studies conducted in controlled laboratory and outdoor artificial streams. Clearly, the in-stream channels, developed as part of the current research, will allow research that contributes to our understanding of community responses to the physical, chemical and biological processes operating in lotic environments.
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10

Hellström, K. (Kalle). "Variation in grazing tolerance and restoration of meadow plant communities." Doctoral thesis, University of Oulu, 2004. http://urn.fi/urn:isbn:9514274938.

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Abstract The area of traditionally managed semi-natural meadows is declining throughout Europe. Knowledge of how to restore their species richness is urgently needed. Community manipulations by means of grazing and mowing and, on the other hand, knowledge of species-level responses as well as the responses of functional plant groups to management may help in planning appropriate restoration tools. The restoration of species richness was studied in two community-level experiments: in a sheep grazing experiment and in a mowing experiment. Three species-level studies were conducted to test the compensatory capacity of monocarpic, herbaceous plants (Gentianella amarella, Erysimum strictum, Euphrasia stricta) to simulated herbivory (10–50% of stem being cut). The perennial Linaria vulgaris was used to study whether there is any benefit of clonal integration in the tolerance of simulated herbivory. This topic was studied in a growth experiment and a 13C tracer study. In both grazing and mowing experiments, small herbs gained more space, while the dominant tall herbs subsided. The species number increased by 30% on the grazed plots, but mowing did not affect species richness, probably indicating seed limitation. At sites of this kind, seed addition could be used to promote restoration. Functional plant groups appeared to be useful in predicting the effects of grazing on plant communities. Early season grazing and mowing seem to be proper management tools in overgrown/degraded meadows. In species-level studies, all the species had relatively good compensatory capacity to repair small damage. Overcompensation was observed in response to apical damage, especially when the growing conditions were favourable, supporting the compensatory continuum hypothesis. The studied monocarpic plant species may share a common unbranched growth form where incidental apical damage leads to activation of uninitialized meristems and slight overcompensation. These responses may represent consequences of adaptation to above-ground competition, rather than adaptation to predictable herbivory. In Linaria, damaged ramets were not supported, but the neighbouring ramets seemed to compete with each other for root resources. While growing in disturbed habitats, it is more profitable for this species to invest in new ramets. The present studies showed that, while the appearance and structure of a traditional grassland rich in small-growing herbs can be restored in five years, it is more difficult to increase species diversity by mere mowing or grazing. Knowledge of the tolerance of individual species for herbivory could provide useful information for planning management practices. More studies on the effects of different management tools on different meadow types are urgently needed for the maintenance of the diversity of these valuable environments
Tiivistelmä Perinteisellä tavalla hoidettujen luonnonniittyjen pinta-ala vähenee kaikkialla Euroopassa. Tarvitsemme enemmän tietoa siitä, miten näiden elinympäristöjen lajiston monimuotoisuus voitaisiin turvata. Tietämys laidunnuksen ja niiton vaikutuksesta kasviyhteisöihin ja toisaalta yksittäisiin kasvilajeihin tai toiminnallisiin kasviryhmiin voi auttaa tehokkaiden hoito- ja ennallistamistapojen löytämisessä. Tässä työssä tutkittiin niittyjen lajirikkauden palauttamista kahdessa yhteisötason kokeessa: lammaslaidunkokeessa ja kokeessa, jossa eri niittotapojen vaikutuksia selvitettiin. Kolmessa lajitason kokeessa testattiin monokarppisten ruohokasvien (rantaukonnauris, horkkakatkero, ketosilmäruoho) kompensaatiokykyä simuloituun herbivoriaan (10–50 % varresta poistettiin). Monivuotista kannusruohoa käytettiin tutkittaessa onko klonaalisesta integraatiosta hyötyä herbivorian siedossa. Tätä selvitettiin kasvukokeella ja hiili-13-merkkiainekokeella. Sekä laidun- että niittokokeessa matalat ruohokasvit saivat kasvutilaa korkeiden ruohojen valta-aseman vähentyessä. Laidunnus lisäsi lajimäärää 30 % koealaa kohti, mutta niitto ei vaikuttanut lajirikkauteen. Molemmissa kokeissa kasviyhteisö oli luultavasti siemenrajoitteinen. Tällaisissa kohteissa siementen lisäystä voitaisiin käyttää ennallistamiskeinona. Toiminnalliset kasviryhmät olivat käyttökelpoisia ennustettaessa laidunnuksen vaikutuksia kasviyhteisöön. Aikaisin kasvukaudella tapahtuva niitto/laidunnus näyttää sopivalta hoitokeinolta umpeenkasvaneilla niityillä. Lajitason kokeissa kaikki tutkitut kasvilajit kykenivät melko hyvin kompensoimaan vähäisiä vaurioita. Ylikompensaatiota havaittiin vasteena kärkivaurioihin erityisesti, kun kasvuolot olivat edulliset. Tämä tuki ns. kompensaatiojatkumohypoteesiä. Tutkituilla lajeilla voi olla yhtenäinen haaraton kasvumuoto, jossa ajoittaiset kärkivauriot johtavat lepotilassa olevien silmujen aktivoitumiseen ja lievään ylikompensaatioon. Nämä vasteet voivat olla seurausta sopeutumisesta valokilpailuun pikemmin kuin sopeutumisesta ennustettavissa olevaan herbivoriaan. Kannusruoholla vaurioituneita versoja ei autettu, vaan kloonin sisällä versot näyttävät kilpailevan keskenään juuriresursseista. Koska laji kasvaa häirityillä paikoilla, sille näyttää olevan edullisempaa investoida uusiin versoihin. Tämä työ osoitti, että vaikka perinteisen matalakasvuisen lajirikkaan niityn ulkonäkö ja rakenne voidaan palauttaa viidessä vuodessa, on vaikeampaa lisätä lajirikkautta pelkän niiton tai laidunnuksen avulla. Tietämys yksittäisten kasvilajien vasteista biomassan menetykseen voi auttaa sopivien hoitotapojen suunnittelussa. Lisää kokeita eri hoitotapojen vaikutuksista ja eri niittytyypeillä tarvitaan pikaisesti näiden arvokkaiden elinympäristöjen monimuotoisuuden ylläpitämiseksi
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Books on the topic "Herbivore grazing"

1

Toth, Gunilla B. Inducible chemical responses and herbivore resistance in seaweeds. Göteborg: Inst. för Marin Ekologi, Göteborgs Universitet, 2002.

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Burkhardt, Jerald Wayne. Herbivory in the Intermountain West: An overview of evolutionary history, historic cultural impacts and lessons from the past. Moscow, Idaho: University of Idaho, Idaho Forest, Wildlife and Range Experiment Station, College of Forestry, Wildlife and Range Sciences, 1996.

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Rivadavia"), Taller de Selección de Dieta por Grandes Herbívoros Mamíferos (2001 Museo Argentino de Ciencias Naturales "Bernardino. Selección de dieta por grandes herbívoros mamíferos: Procesos y escalas. Buenos Aires: Museo Argentino de Ciencias Naturales "Bernardino Rivadavia", 2002.

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Putman, R. J. Grazing in Temperate Ecosystems Large Herbivores and the Ecology of the New Forest. Dordrecht: Springer Netherlands, 1986. http://dx.doi.org/10.1007/978-94-011-6081-0.

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Kjell, Danell, ed. Large herbivore ecology, ecosystem dynamics and conservation. Cambridge: Cambridge University Press, 2006.

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(Editor), Kjell Danell, Roger Bergström (Editor), Patrick Duncan (Editor), and John Pastor (Editor), eds. Large Herbivore Ecology, Ecosystem Dynamics and Conservation (Conservation Biology). Cambridge University Press, 2006.

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(Editor), Kjell Danell, Roger Bergström (Editor), Patrick Duncan (Editor), and John Pastor (Editor), eds. Large Herbivore Ecology, Ecosystem Dynamics and Conservation (Conservation Biology). Cambridge University Press, 2006.

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Prins, Herbert H. T., and Iain J. Gordon. The Ecology of Browsing and Grazing. Springer, 2010.

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Wilsey, Brian J. Factors Maintaining and Regulating Grassland Structure and Function. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198744511.003.0003.

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Intrinsic disturbances are processes that have occurred on an evolutionary time scale, and include fire, wind-damage, digging or burrowing by fossorial mammals, defoliation, and trampling by native large mammals. Grassland species evolved with intrinsic disturbances, and they can be important in maintaining grassland community structure and functioning. Adaptations to fire include short herbaceous stature, high allocation belowground, ability to resprout, and smoke-induced seed germination. Fire interacts with grazing because grazing reduces litter (fuel) load, and fires affect forage quality. Plants can tolerate some level of herbivory in most grasslands. Adaptations that enable grassland plants to resist grazing are similar to plant adaptations to fire. Drought can affect grasslands at a variety of time scales. Vegetative reproduction can allow rapid recolonization after droughts have ended. Plowing is the most common disturbance affecting grasslands, and it has been used to transform native grasslands into crop fields and simplified pasture.
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Putman, Roderick J. Grazing in Temperate Ecosystems: Large Herbivores and the Ecology of the New Forest. Timber Press, Incorporated, 1986.

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Book chapters on the topic "Herbivore grazing"

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Bliss, L. C. "Arctic Ecosystems: Their Structure, Function and Herbivore Carrying Capacity." In Grazing Research at Northern Latitudes, 5–25. Boston, MA: Springer US, 1986. http://dx.doi.org/10.1007/978-1-4757-5338-7_2.

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Malechek, John C., David F. Balph, and Federick D. Provenza. "Plant Defense and Herbivore Learning: Their Consequences for Livestock Grazing Systems." In Grazing Research at Northern Latitudes, 193–208. Boston, MA: Springer US, 1986. http://dx.doi.org/10.1007/978-1-4757-5338-7_19.

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Rowan, John, and J. T. Faith. "The Paleoecological Impact of Grazing and Browsing: Consequences of the Late Quaternary Large Herbivore Extinctions." In The Ecology of Browsing and Grazing II, 61–79. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-25865-8_3.

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Valdivia, Nelson. "Seaweed-Herbivore Interactions: Grazing as Biotic Filtering in Intertidal Antarctic Ecosystems." In Antarctic Seaweeds, 265–78. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-39448-6_13.

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WallisDeVries, Michiel F. "Large herbivores as key factors for nature conservation." In Grazing and Conservation Management, 1–20. Dordrecht: Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-011-4391-2_1.

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WallisDeVries, Michiel F. "Habitat quality and the performance of large herbivores." In Grazing and Conservation Management, 275–320. Dordrecht: Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-011-4391-2_9.

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Van Wieren, Sipke E. "Effects of large herbivores upon the animal community." In Grazing and Conservation Management, 185–214. Dordrecht: Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-011-4391-2_6.

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Vulink, J. Theo, and Mennobart R. Van Eerden. "Hydrological conditions and herbivory as key operators for ecosystem development in Dutch artificial wetlands." In Grazing and Conservation Management, 217–52. Dordrecht: Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-011-4391-2_7.

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Venter, Jan A., Mika M. Vermeulen, and Christopher F. Brooke. "Feeding Ecology of Large Browsing and Grazing Herbivores." In The Ecology of Browsing and Grazing II, 127–53. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-25865-8_5.

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Rittenhouse, Larry R. "The Relative Efficency of Rangeland Use by Ruminants and Non-Ruminant Herbivores." In Grazing Research at Northern Latitudes, 179–91. Boston, MA: Springer US, 1986. http://dx.doi.org/10.1007/978-1-4757-5338-7_18.

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Conference papers on the topic "Herbivore grazing"

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Gonnelli, Vincenzo. "Impact of wild herbivores grazing on herbaceous vegetation and shrubs at the silvers fir forest of the Riserve Naturali Casentinesi: removal of biomass, alteration of vegetation dynamics, simplification of flora and impact on forest regeneration." In Secondo Congresso Internazionale di Selvicoltura = Second International Congress of Silviculture. Accademia Italiana di Scienze Forestali, 2015. http://dx.doi.org/10.4129/2cis-vg-imp.

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