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 r...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.展开更多
基金The Swedish Society for Nature Conservation(Miljöfonden),the University of Gothenburg and the Swedish Anglers Association funded this studyCompletion of the manuscript was realized with support from the SoWa Research Infrastructure(MEYS CZ grant LM2015075)to JNNeither 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.
文摘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.
