全球智库信息集成服务系统(G2TT): Ontogenetic niche shifts and evolutionary branching in size-structured populations.

G2TT

来源类型	Article
规范类型	其他
	Ontogenetic niche shifts and evolutionary branching in size-structured populations.
	Claessen D; Dieckmann U
发表日期	2002
出处	Evolutionary Ecology Research : 189-217.
出版年	2002
语种	英语
摘要	There are many examples of size-structured populations where individuals sequentially exploit several niches in the course of their life history. Efficient exploitation of such ontogenetic niches generally requires specific morphological adaptations. Here, we study the evolutionary implications of the combination of an ontogenetic niche shift and environmental feedback. We present a mechanistic, size-structured model in which we assume that predators exploit one niche when they are small and a second niche when they are big. The niche shift is assumed to be irreversible and determined genetically. Environmental feedback arises from the impact that predation has on the density of the prey populations. Our results show that, initially, the environmental feedback drives evolution towards a generalist strategy that exploits both niches equally. Subsequently, it depends on the size-scaling of the foraging rates on the two prey types whether the generalist is a continuously stable strategy or an evolutionary branching point. In the latter case, divergent selection results in a resource dimorphism, with two specialist subpopulations. We formulate the conditions for evolutionary branching in terms of parameters of the sizedependent functional response. We discuss our results in the context of observed resource polymorphisms and adaptive speciation in freshwater fish species.
主题	Adaptive Dynamics Network (ADN)
关键词	Arctic char Bluegill Cichlids Evolution Feedback Ontogenetic niche shift Perch Population dynamics Resource polymorphism Roach Size structure
URL	http://pure.iiasa.ac.at/id/eprint/6602/
来源智库	International Institute for Applied Systems Analysis (Austria)
资源类型	智库出版物
条目标识符	http://119.78.100.153/handle/2XGU8XDN/128076
推荐引用方式 GB/T 7714	Claessen D,Dieckmann U. Ontogenetic niche shifts and evolutionary branching in size-structured populations.. 2002.

条目包含的文件
文件名称/大小	资源类型	版本类型	开放类型	使用许可
ClaessenDieckmann200（429KB）	智库出版物		限制开放	CC BY-NC-SA	浏览