Behavioral type,in interaction with body size,affects the recapture rate of brown trout Salmo trutta juveniles in their nursery stream  

作　　者：Joacim NÄSLUND Niklas WENGSTRÖM Fredrik WAHLQVIST David ALDVÉN LiborZÁVORKA Johan HÖJESJÖ 

机构地区：[1]Department of Biological and Environmental Sciences,University of Gothenburg,Gothenburg,Sweden [2]Department of Ecosystem Biology,University of South Bohemia inČeskéBudějovice,ČeskéBudějovice,Czech Republic [3]Swedish Anglers Association,Gothenburg,Sweden

出　　处：《Integrative Zoology》2018年第5期604-611,共8页整合动物学（英文版）

基　　金：The Swedish Society for Nature Conservation(Miljöfonden),the University of Gothenburg and the Swedish Anglers Association funded this study;Completion of the manuscript was realized with support from the SoWa Research Infrastructure(MEYS CZ grant LM2015075)to JN;Neither funding agencies,nor the affiliations of DA to Vattenfall AB and of NW to Swedish Anglers Association have influenced the results,their interpretation or their presentation.

摘　　要：Movement activity levels of wild animals often differ consistently among individuals,reflecting different behavioral types.Previous studies have shown that laboratory-scored activity can predict several ecologically relevant characteristics.In an experiment on wild brown trout Salmo trutta,spanning from June to October,we investigated how spring swimming activity,measured in a standardized laboratory test,related to relative recapture probability in autumn.Based on laboratory activity scores,individuals clustered into 2 groups,which showed contrasting patterns in the size-dependency of their recapture probability.Size had a slightly positive effect on recapture probability for passive fish but a clear negative effect on active fish.Our results show that the population structure in a cohort,in terms of relative proportions of behavioral types in different size classes,can vary over time.The results of this study could depend on either selective mortality or migration.However,selective disappearance of individuals with specific phenotypes,regardless of the mechanism,will have implications for trout population management,such as stocking efficiency of hatchery fish with high growth rates or maintenance of fishways past migration barriers.

关 键 词：animal personality freshwater fish recapture rate SALMONIDAE size-dependency 

分 类 号：S91[农业科学—水产科学]