干旱区生态环境知识资源中心(Arid): Foraging strategies of individual silky pocket mice over a boom-bust cycle in a stochastic dryland ecosystem

Arid

DOI	10.1007/s00442-019-04432-x
	Foraging strategies of individual silky pocket mice over a boom-bust cycle in a stochastic dryland ecosystem
	Noble, Jennifer D.1; Collins, Scott L.1; Hallmark, Alesia J.1; Maldonado, Karin 2; Wolf, Blair O.1; Newsome, Seth D.1
通讯作者	Collins, Scott L.
来源期刊	OECOLOGIA
ISSN	0029-8549
EISSN	1432-1939
出版年	2019
卷号	190 期号:3 页码:569-578
英文摘要	Small mammals use multiple foraging strategies to compensate for fluctuating resource quality in stochastic environments. These strategies may lead to increased dietary overlap when competition for resources is strong. To quantify temporal contributions of high (C-3) versus low quality (C-4) resources in diets of silky pocket mice (Perognathus flavus), we used stable carbon isotope (delta C-13) analysis of 1391 plasma samples collected over 2years. Of these, 695 samples were from 170 individuals sampled >= 3 times across seasons or years, allowing us to assess changes in dietary breadth at the population and individual levels across a boom-bust population cycle. In 2014, the P. flavus population increased to 412 captures compared to 8 captures in prior and subsequent years, while populations of co-occurring small mammals remained stable. As intraspecific competition increased, the population-wide dietary niche of P. flavus did not change, but individual specialization increased significantly. During this period, similar to 27% (41/151) of individuals sampled specialized on C-3 resources, which were abundant during the spring and previous fall seasons. Most of the remaining individuals were C-3-C-4 generalists (64%) (96/151), and only 9% (14/151) specialized on C-4 resources. In 2015, P. flavus population density and resource availability declined, individual dietary breadth expanded (84% generalists), no C-3 specialists were found, and specialization on C-4 resources increased (16%). Our results demonstrate a high degree of inter-individual plasticity in P. flavus foraging strategies, which has implications for how this species will respond to environmental change that is predicted to decrease C-3 resources in the future.
英文关键词	Generalists Intraspecific competition Niche variation hypothesis Perognathus flavus Specialists
类型	Article
语种	英语
国家	USA ; Chile
收录类别	SCI-E
WOS记录号	WOS:000476826200006
WOS关键词	NORTHERN CHIHUAHUAN DESERT ; NICHE VARIATION HYPOTHESIS ; NET PRIMARY PRODUCTION ; INTRASPECIFIC COMPETITION ; DISCRIMINATION FACTORS ; RESOURCE AVAILABILITY ; POPULATION-DYNAMICS ; SMALL MAMMALS ; SPECIALIZATION ; DIET
WOS类目	Ecology
WOS研究方向	Environmental Sciences & Ecology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/217809
作者单位	1.Univ New Mexico, Dept Biol, Albuquerque, NM 87131 USA; 2.Univ Adolfo Ibanez, Fac Artes Liberales, Dept Ciencias, Diagonal Las Torres 2640, Santiago, Chile
推荐引用方式 GB/T 7714	Noble, Jennifer D.,Collins, Scott L.,Hallmark, Alesia J.,et al. Foraging strategies of individual silky pocket mice over a boom-bust cycle in a stochastic dryland ecosystem[J],2019,190(3):569-578.
APA	Noble, Jennifer D.,Collins, Scott L.,Hallmark, Alesia J.,Maldonado, Karin,Wolf, Blair O.,&Newsome, Seth D..(2019).Foraging strategies of individual silky pocket mice over a boom-bust cycle in a stochastic dryland ecosystem.OECOLOGIA,190(3),569-578.
MLA	Noble, Jennifer D.,et al."Foraging strategies of individual silky pocket mice over a boom-bust cycle in a stochastic dryland ecosystem".OECOLOGIA 190.3(2019):569-578.