Climate Change Data Portal
DOI | 10.1016/j.jaridenv.2015.08.016 |
Biotic interactions and community dynamics in the semiarid thorn scrub of Bosque Fray Jorge National Park, north-central Chile: A paradigm revisited | |
Meserve, Peter L.1,9; Kelt, Douglas A.2; Gutierrez, Julio R.3,4,5; Andrea Previtali, M.6,7; Milstead, W. Bryan8 | |
发表日期 | 2016-03-01 |
ISSN | 0140-1963 |
卷号 | 126页码:81-88 |
英文摘要 | In 1989, we initiated a long-term field experiment in a semiarid thorn scrub community in north-central Chile. We posited that biotic interactions, particularly predation, interspecific competition, and herbivory assumed a primary top-down role in affecting small mammals and annual plants here. Using a multi factorial design we selectively excluded vertebrate predators (principally carnivores and raptors) and a large small mammal herbivore, the degu (Octodon degus), from replicated 0.56 ha exclosures located in a valley near the coast in Bosque Fray Jorge National Park. Evidence initially supported effects of predator exclusion on O. degus but not for other small mammals in the assemblage (e.g., Phyllotis darwini, Abrothrix olivaceus). Subsequent years of monitoring have documented that predation has temporary effects on degu numbers, but that populations of this and other small mammals are much more strongly influenced by environmental bottom-up factors (i.e., rainfall). Further, our experimental manipulation has provided no evidence for negative interspecific competition effects on numbers of any small mammal in this assemblage. Degu exclusions, however, have had negative indirect effects on exotic annuals; native annuals appear to outcompete exotics especially during drought years The effect is magnified in all-small mammal exclusions. Since about 2002, selective exclusions of lagomorphs and small mammals have resulted in changes in cover of some perennial shrubs. Also notable has been a fundamental shift in the small mammal composition following the last major El Nino Southern Oscillation (ENSO) event in 2000 2002; degus now comprise a majority of small mammal biomass in the assemblage, and their numbers have become more stable and less temporally variable. This appears to have been caused by a shift in rainfall periodicity from strong interannual fluctuations in response to periodic ENSOs, to a more equitable pattern with more consistent annual rainfall. This represents one of the first documented cases of system-wide biotic phase shifts to a relatively modest change in rainfall regime. This may be indicative of ongoing climate change in the Chilean semiarid region, and we expect that further changes in the community will occur if those trends continue. (C) 2015 Elsevier Ltd. All rights reserved. |
英文关键词 | Long-term studies;Population;Community ecology;Small mammals;Chile |
语种 | 英语 |
WOS记录号 | WOS:000370101200011 |
来源期刊 | JOURNAL OF ARID ENVIRONMENTS
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来源机构 | 美国环保署 |
文献类型 | 期刊论文 |
条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/61623 |
作者单位 | 1.No Illinois Univ, Dept Biol Sci, De Kalb, IL 60115 USA; 2.Univ Calif Davis, Dept Wildlife Fish & Conservat Biol, Davis, CA 95616 USA; 3.Univ La Serena, Casilla 599, La Serena, Chile; 4.CEAZA, Casilla 599, La Serena, Chile; 5.IEB, Casilla 653, Santiago, Chile; 6.Univ Nacl Litoral, Fac Humanidades & Ciencias, Dept Ciencias Nat, RA-3000 Santa Fe, Argentina; 7.Consejo Nacl Invest Cient & Tecn, RA-3000 Santa Fe, Argentina; 8.US EPA, Natl Hlth & Environm Effects Lab, Atlantic Ecol Div, Narragansett, RI 02882 USA; 9.Univ Idaho, Dept Biol Sci, Moscow, ID 83844 USA |
推荐引用方式 GB/T 7714 | Meserve, Peter L.,Kelt, Douglas A.,Gutierrez, Julio R.,et al. Biotic interactions and community dynamics in the semiarid thorn scrub of Bosque Fray Jorge National Park, north-central Chile: A paradigm revisited[J]. 美国环保署,2016,126:81-88. |
APA | Meserve, Peter L.,Kelt, Douglas A.,Gutierrez, Julio R.,Andrea Previtali, M.,&Milstead, W. Bryan.(2016).Biotic interactions and community dynamics in the semiarid thorn scrub of Bosque Fray Jorge National Park, north-central Chile: A paradigm revisited.JOURNAL OF ARID ENVIRONMENTS,126,81-88. |
MLA | Meserve, Peter L.,et al."Biotic interactions and community dynamics in the semiarid thorn scrub of Bosque Fray Jorge National Park, north-central Chile: A paradigm revisited".JOURNAL OF ARID ENVIRONMENTS 126(2016):81-88. |
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