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Context-dependent effects of shifting large herbivore assemblages on plant structure and diversity
dc.contributor.authorOrr, Devyn A.
dc.contributor.authorBui, An
dc.contributor.authorKlope, Maggie
dc.contributor.authorMcCullough, Ian M.
dc.contributor.authorLee, Michelle
dc.contributor.authorMotta, Carina
dc.contributor.authorMayorga, Isabella
dc.contributor.authorKonicek, Kelli
dc.contributor.authorYoung, Hillary S.
dc.date.accessioned2022-07-05T21:04:16Z
dc.date.available2023-07-05 17:04:14en
dc.date.available2022-07-05T21:04:16Z
dc.date.issued2022-06
dc.identifier.citationOrr, Devyn A.; Bui, An; Klope, Maggie; McCullough, Ian M.; Lee, Michelle; Motta, Carina; Mayorga, Isabella; Konicek, Kelli; Young, Hillary S. (2022). "Context-dependent effects of shifting large herbivore assemblages on plant structure and diversity." Journal of Ecology (6): 1312-1327.
dc.identifier.issn0022-0477
dc.identifier.issn1365-2745
dc.identifier.urihttps://hdl.handle.net/2027.42/173033
dc.description.abstractDespite wide recognition of the importance of anthropogenically driven changes in large herbivore communities—including both declines in wildlife and increases in livestock—there remain large gaps in our knowledge about the impacts of these changes on plant communities, particularly when combined with concurrent changes in climate. Considering these prominent forms of global change in tandem enables us to better understand controls on savanna vegetation structure and diversity under real-world conditions.We conducted a field experiment using complete and semi-permeable herbivore exclosures to explore the difference in plant communities among sites with wild herbivores only, with cattle in addition to wild herbivores, and with no large herbivores. To understand variation in effects across climatic contexts, the experiment was replicated at three locations along a topoclimatic gradient in California. Critically, this is the first such experiment to compare cattle and wildlife impacts along an environmental gradient within a single controlled experiment.Vegetation structure responded strongly to herbivore treatment regardless of climate. Relative to the isolated effects of wildlife, exclusion of all large herbivores generally increased structural components related to cover and above-ground biomass while the addition of cattle led to reductions in vegetation cover, litter, shading and standing biomass. Furthermore, wildlife had a consistent neutral or positive effect on plant diversity, while the effect of livestock addition was context dependent. Cattle had a neutral to strongly negative effect at low aridity, but a positive effect at high aridity. These results suggest that (a) herbivore effects can override climate effects on vegetation structure, (b) cattle addition can drive different effects on diversity and (c) herbivore effects on diversity are modulated by climate.Synthesis. Our results illustrate very distinctive shifts in plant communities between two realistic forms of change in ungulate herbivore assemblages—livestock addition and large herbivore losses—particularly for plant diversity responses, and that these responses vary across climatic contexts. This finding has important implications for the management and protection of plant biodiversity given that over a quarter of the Earth’s land area is managed for livestock and climate regimes are changing globally.Our results illustrate very distinctive shifts in plant communities between two realistic forms of change in ungulate herbivore assemblages—livestock addition and large herbivore losses—particularly for plant diversity responses, and that these responses vary across climatic contexts. This finding has important implications for the management and protection of plant biodiversity given that over a quarter of the Earth’s land area is managed for livestock and climate regimes are changing globally.
dc.publisherUniversity of California Press
dc.publisherWiley Periodicals, Inc.
dc.subject.otherwildlife
dc.subject.otherplant–herbivore interactions
dc.subject.otherbiodiversity
dc.subject.othercattle
dc.subject.otherclimate
dc.subject.othercommunity structure
dc.subject.othercontext dependence
dc.subject.otherherbivory
dc.subject.otherlivestock
dc.titleContext-dependent effects of shifting large herbivore assemblages on plant structure and diversity
dc.typeArticle
dc.rights.robotsIndexNoFollow
dc.subject.hlbsecondlevelEcology and Evolutionary Biology
dc.subject.hlbtoplevelScience
dc.description.peerreviewedPeer Reviewed
dc.description.bitstreamurlhttp://deepblue.lib.umich.edu/bitstream/2027.42/173033/1/jec13871.pdf
dc.description.bitstreamurlhttp://deepblue.lib.umich.edu/bitstream/2027.42/173033/2/jec13871-sup-0001-Supinfo.pdf
dc.description.bitstreamurlhttp://deepblue.lib.umich.edu/bitstream/2027.42/173033/3/jec13871_am.pdf
dc.identifier.doi10.1111/1365-2745.13871
dc.identifier.sourceJournal of Ecology
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