干旱区生态环境知识资源中心(Arid): Competition shapes individual foraging and survival in a desert rodent ensemble

Arid

DOI	10.1111/1365-2656.13583
	Competition shapes individual foraging and survival in a desert rodent ensemble
	Manlick, Philip J.; Maldonado, Karin; Newsome, Seth D.
通讯作者	Manlick, PJ (corresponding author), Univ New Mexico, Dept Biol, Albuquerque, NM 87131 USA.
来源期刊	JOURNAL OF ANIMAL ECOLOGY
ISSN	0021-8790
EISSN	1365-2656
出版年	2021-09
英文摘要	Intraspecific variation, including individual diet variation, can structure populations and communities, but the causes and consequences of individual foraging strategies are often unclear. Interactions between competition and resources are thought to dictate foraging strategies (e.g. specialization vs. generalization), but classical paradigms such as optimal foraging and niche theory offer contrasting predictions for individual consumers. Furthermore, both paradigms assume that individual foraging strategies maximize fitness, yet this prediction is rarely tested. We used repeated stable isotope measurements (delta C-13, delta N-15; N = 3,509) and 6 years of capture-mark-recapture data to quantify the relationship between environmental variation, individual foraging and consumer fitness among four species of desert rodents. We tested the relative effects of intraspecific competition, interspecific competition, resource abundance and resource diversity on the foraging strategies of 349 individual animals, and then quantified apparent survival as function of individual foraging strategies. Consistent with niche theory, individuals contracted their trophic niches and increased foraging specialization in response to both intraspecific and interspecific competition, but this effect was offset by resource availability and individuals generalized when plant biomass was high. Nevertheless, individual specialists obtained no apparent fitness benefit from trophic niche contractions as the most specialized individuals exhibited a 10% reduction in monthly survival compared to the most generalized individuals. Ultimately, this resulted in annual survival probabilities nearly 4x higher for generalists compared to specialists. These results indicate that competition is the proximate driver of individual foraging strategies, and that diet-mediated fitness variation regulates population and community dynamics in stochastic resource environments. Furthermore, our findings show dietary generalism is a fitness maximizing strategy, suggesting that plastic foraging strategies may play a key role in species' ability to cope with environmental change.
英文关键词	Chihuahuan desert Dipodomys merriami Dipodomys ordii Dipodomys spectabilis heteromyid individual specialization Perognathus flavus Sevilleta LTER
类型	Article ; Early Access
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000695057600001
WOS关键词	NORTHERN CHIHUAHUAN DESERT ; NICHE VARIATION HYPOTHESIS ; NET PRIMARY PRODUCTION ; DIET SPECIALIZATION ; DIPODOMYS-MERRIAMI ; POPULATION ECOLOGY ; STABLE-ISOTOPES ; KANGAROO RATS ; INTRASPECIFIC COMPETITION ; FIELD EVIDENCE
WOS类目	Ecology ; Zoology
WOS研究方向	Environmental Sciences & Ecology ; Zoology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/363721
作者单位	[Manlick, Philip J.; Newsome, Seth D.] Univ New Mexico, Dept Biol, Albuquerque, NM 87131 USA; [Maldonado, Karin] Univ Adolfo Ibanez, Fac Artes Liberales, Dept Ciencias, Penalolen, Chile
推荐引用方式 GB/T 7714	Manlick, Philip J.,Maldonado, Karin,Newsome, Seth D.. Competition shapes individual foraging and survival in a desert rodent ensemble[J],2021.
APA	Manlick, Philip J.,Maldonado, Karin,&Newsome, Seth D..(2021).Competition shapes individual foraging and survival in a desert rodent ensemble.JOURNAL OF ANIMAL ECOLOGY.
MLA	Manlick, Philip J.,et al."Competition shapes individual foraging and survival in a desert rodent ensemble".JOURNAL OF ANIMAL ECOLOGY (2021).