Temperature modifies activity, inter-individual relationships and group structure in a fish

Temperature modifies activity, inter-individual relationships and group structure in a fish

Tatiana COLCHEN;Fabrice TELETCHEA;Pascal FONTAINE;Alain PASQUET

【期刊名称】《动物学报（英文版）》 【年(卷),期】2017(063)002 【摘要】A

host

of

abiotic

factors

modify

fish

social

behavior.However,few studies have characterized the effects of temperature on behavior.In this study,brown trout Salmo trutta fry were reared at 5 different temperatures (4℃,6℃,8℃,10℃,and 12℃).In order to characterize group structure,3 behavioral parameters were investigated:group

social

structure

(based

on

inter-individual

distances),inter-individual relationships (based on physical contacts),and individual activity.These behavioral parameters were studied at the emergence stage,which corresponds to a switch from a social gregarious life in the gravel to a solitary one in the water column.Data analysis showed that the interindividual distances increased with increasing temperature,particularly the nearest neighbor distance.The mean number of physical contacts between fry increased at both low and high temperatures.At high temperatures,most fry moved apart from each other after a physical contact.Swimming activity decreased at both the lower and upper temperatures (18％ of activity at 4℃,38％ at 8℃,and 12％ at 12℃).This study showed that temperature modifies