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| 1 | Relatedness and spatial distance modulate intergroup interactions: experimental evidence from a social rodent显示文摘Kin selection theory predicts that individuals should generally behave less aggressively or more amicably towards relatives than nonkin.However,how individuals treat conspecifics depends on genetic relatedness but also on the ecological context,which influences the benefits and costs of their interactions.In this study,we used microsatellite DNA markers and behavioral tests to examine the influence of kinship and proximity on the social behavior of Mongolian gerbils Meriones unguiculatus living in different social groups,and whether these effects varied with sex and season.We recorded the duration of 4 behavioral categories(investigative,neutral,amicable,and agonistic)during a 10-min pairwise test.We found that genetic relatedness had significant effects on the duration of investigative,neutral,and amicable behavior,but not on agonistic behavior.We also found significant interaction effects of relatedness and distance between burrow systems(i.e.,spatial distance)on investigative,neutral,and amicable behavior,which suggests that the effects of kinship on social behavior were restricted by spatial proximity.The interaction effect between sex and relatedness on amicable behavior showed that male gerbils became more intimate with individuals of the same sex that had higher pairwise relatedness than females.Furthermore,both male and female gerbils enhanced their aggression during the food-hoarding season,but the intensity of these changes was significantly higher in females.Overall,our results suggest that the effects of kinship and spatial proximity on social behavior exhibit sexual or seasonal patterns,thereby implying ecological context-dependent responses to out-group individuals in Mongolian gerbils. | Ke DENG Wei LIU De-Hua WANG | 2019 | Current Zoology2019，65，5： | 3 |
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