全球智库信息集成服务系统(G2TT): Fisheries-induced trends in reaction norms for maturation in North Sea plaice.

G2TT

来源类型	Conference or Workshop Item (UNSPECIFIED)
规范类型	其他
	Fisheries-induced trends in reaction norms for maturation in North Sea plaice.
	Grift RE; Rijnsdorp AD; Barot S; Heino M; Dieckmann U
发表日期	2002
出处	ICES CM Documents 2002 - ICES Annual Science Conference, 1-5 October 2002
出版年	2002
语种	英语
摘要	We analyse the potential of intensive exploitation to have caused evolutionary changes in the age and length at maturation in North Sea plaice Pleuronectes platessa. Such evolutionary change in the onset of maturation is expected given that fishing mortality is more than four times higher than natural mortality. In order to disentangle phenotypic plasticity from evolutionary change, we employ the probabilistic reaction-norm approach. This technique allows us to estimate the probabilities of maturing at each relevant age and size, and to disentangle the plasticity in age and size at maturation that results from changes in growth rates from evolutionary changes in maturation propensities themselves. This recently developed method is here applied to females of 41 cohorts (1955-1995) of North Sea plaice. We focus on trends in fishing mortality, in growth rates, and in the probabilities of maturing, and test the hypothesis that the decrease in age and length at maturation is partly caused by fisheries-induced adaptive change. We find that the reaction norm for age and length at maturation has indeed significantly shifted towards younger age and smaller length. The reactionnorm analysis suggests a picture in which short-term fluctuations originating from plastic responses are superimposed on a persistent long-term trend resulting from genetic responses.
主题	Adaptive Dynamics Network (ADN)
关键词	Plaice Pleuronectes platessa
URL	http://pure.iiasa.ac.at/id/eprint/6683/
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/132067
推荐引用方式 GB/T 7714	Grift RE,Rijnsdorp AD,Barot S,et al. Fisheries-induced trends in reaction norms for maturation in North Sea plaice.. 2002.