干旱区生态环境知识资源中心(Arid): Caching in or Falling Back at the Sevilleta: The Effects of Body Size and Seasonal Uncertainty on Desert Rodent Foraging

Arid

DOI	10.1086/709019
	Caching in or Falling Back at the Sevilleta: The Effects of Body Size and Seasonal Uncertainty on Desert Rodent Foraging
	Yeakel, Justin D.; Bhat, Uttam; Newsome, Seth D.
通讯作者	Yeakel, JD
来源期刊	AMERICAN NATURALIST
ISSN	0003-0147
EISSN	1537-5323
出版年	2020
卷号	196 期号:2 页码:241-256
英文摘要	Foraging in uncertain environments requires balancing the risks associated with finding alternative resources against potential gains. In arid-land environments characterized by extreme variation in the amount and seasonal timing of primary production, consumers must weigh the risks associated with foraging for preferred seeds that can be cached against fallback foods of low nutritional quality (e.g., leaves) that must be consumed immediately. Here, we explore the influence of resource scarcity, body size, and seasonal uncertainty on the expected foraging behaviors of caching rodents in the northern Chihuahaun Desert by integrating these elements with a stochastic dynamic program to determine fitness-maximizing foraging strategies. We demonstrate that resource-limited environments promote dependence on fallback foods, reducing the likelihood of starvation while increasing future risk exposure. Our results point to a qualitative difference in the use of fallback foods and the fitness benefits of caching at the threshold body size of 50 g. Above this 50-g body size threshold, we observe large fitness gains associated with the maintenance of even a modest-sized cache, whereas similar gains for smaller consumers require maintenance of unrealistically large caches. This suggests that larger-bodied consumers that cache may be less sensitive to the future uncertainties in monsoonal onset predicted by global climate scenarios, whereas smaller consumers, regardless of caching behavior, may be at greater risk.
英文关键词	foraging caching fallback foods Sevilleta stochastic dynamic programing
类型	Article
语种	英语
收录类别	SSCI
WOS记录号	WOS:000548984500011
WOS关键词	UNDERGROUND-STORAGE ORGANS ; FALLBACK FOODS ; FASTING ENDURANCE ; LONG-TERM ; STABLE-ISOTOPES ; PRIMATE ECOLOGY ; EVOLUTION ; COMPETITION ; MORTALITY ; ENERGY
WOS类目	Ecology ; Evolutionary Biology
WOS研究方向	Environmental Sciences & Ecology ; Evolutionary Biology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/325059
作者单位	[Yeakel, Justin D.; Bhat, Uttam] Univ Calif Merced, Merced, CA 95343 USA; [Yeakel, Justin D.; Bhat, Uttam] Santa Fe Inst, Santa Fe, NM 87501 USA; [Bhat, Uttam] Univ Calif Santa Cruz, Dept Ecol & Evolutionary Biol, Santa Cruz, CA 95064 USA; [Newsome, Seth D.] Univ New Mexico, Albuquerque, NM 87131 USA
推荐引用方式 GB/T 7714	Yeakel, Justin D.,Bhat, Uttam,Newsome, Seth D.. Caching in or Falling Back at the Sevilleta: The Effects of Body Size and Seasonal Uncertainty on Desert Rodent Foraging[J],2020,196(2):241-256.
APA	Yeakel, Justin D.,Bhat, Uttam,&Newsome, Seth D..(2020).Caching in or Falling Back at the Sevilleta: The Effects of Body Size and Seasonal Uncertainty on Desert Rodent Foraging.AMERICAN NATURALIST,196(2),241-256.
MLA	Yeakel, Justin D.,et al."Caching in or Falling Back at the Sevilleta: The Effects of Body Size and Seasonal Uncertainty on Desert Rodent Foraging".AMERICAN NATURALIST 196.2(2020):241-256.