Arid
DOI10.1002/ece3.2785
When perception reflects reality: Non-native grass invasion alters small mammal risk landscapes and survival
Ceradini, Joseph P.1; Chalfoun, Anna D.2
通讯作者Ceradini, Joseph P.
来源期刊ECOLOGY AND EVOLUTION
ISSN2045-7758
出版年2017
卷号7期号:6页码:1823-1835
英文摘要

Modification of habitat structure due to invasive plants can alter the risk landscape for wildlife by, for example, changing the quality or availability of refuge habitat. Whether perceived risk corresponds with actual fitness outcomes, however, remains an important open question. We simultaneously measured how habitat changes due to a common invasive grass (cheatgrass, Bromus tectorum) affected the perceived risk, habitat selection, and apparent survival of a small mammal, enabling us to assess how well perceived risk influenced important behaviors and reflected actual risk. We measured perceived risk by nocturnal rodents using a giving-up density foraging experiment with paired shrub (safe) and open (risky) foraging trays in cheatgrass and native habitats. We also evaluated microhabitat selection across a cheatgrass gradient as an additional assay of perceived risk and behavioral responses for deer mice (Peromyscus maniculatus) at two spatial scales of habitat availability. Finally, we used mark-recapture analysis to quantify deer mouse apparent survival across a cheatgrass gradient while accounting for detection probability and other habitat features. In the foraging experiment, shrubs were more important as protective cover in cheatgrass-dominated habitats, suggesting that cheatgrass increased perceived predation risk. Additionally, deer mice avoided cheatgrass and selected shrubs, and marginally avoided native grass, at two spatial scales. Deer mouse apparent survival varied with a cheatgrass-shrub interaction, corresponding with our foraging experiment results, and providing a rare example of a native plant mediating the effects of an invasive plant on wildlife. By synthesizing the results of three individual lines of evidence (foraging behavior, habitat selection, and apparent survival), we provide a rare example of linkage between behavioral responses of animals indicative of perceived predation risk and actual fitness outcomes. Moreover, our results suggest that exotic grass invasions can influence wildlife populations by altering risk landscapes and survival.


英文关键词habitat homogenization habitat selection human-induced habitat change invasion biology invasive species optimal foraging predation risk
类型Article
语种英语
国家USA
收录类别SCI-E
WOS记录号WOS:000397458000014
WOS关键词GREAT-BASIN DESERT ; PREDATION RISK ; BIOLOGICAL INVASIONS ; LOGISTIC-REGRESSION ; ECOLOGICAL IMPACTS ; CHEATGRASS ; RODENTS ; RESPONSES ; ECOSYSTEM ; PLANTS
WOS类目Ecology ; Evolutionary Biology
WOS研究方向Environmental Sciences & Ecology ; Evolutionary Biology
来源机构United States Geological Survey
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/198492
作者单位1.Univ Wyoming, Dept Zool & Physiol, Wyoming Cooperat Fish & Wildlife Res Unit, Laramie, WY 82071 USA;
2.Univ Wyoming, Dept Zool & Physiol, US Geol Survey, Wyoming Cooperat Fish & Wildlife Res Unit, Laramie, WY 82071 USA
推荐引用方式
GB/T 7714
Ceradini, Joseph P.,Chalfoun, Anna D.. When perception reflects reality: Non-native grass invasion alters small mammal risk landscapes and survival[J]. United States Geological Survey,2017,7(6):1823-1835.
APA Ceradini, Joseph P.,&Chalfoun, Anna D..(2017).When perception reflects reality: Non-native grass invasion alters small mammal risk landscapes and survival.ECOLOGY AND EVOLUTION,7(6),1823-1835.
MLA Ceradini, Joseph P.,et al."When perception reflects reality: Non-native grass invasion alters small mammal risk landscapes and survival".ECOLOGY AND EVOLUTION 7.6(2017):1823-1835.
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