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生物学
Vigilance behavior of Pyrenean chamois Rupicapra pyrenaica pyrenaica:Effect of sex and position in the herd
<正> The Pyrenean chamois Rupicapra pyrenaica pyrenaica is a mountain-dwelling ungulate with an extensive presencein open areas. Optimal group size results from the trade off between advantages (a reduction in the risk of predation) and disadvantages(competition between members of the herd) of group living. In addition, advantages and disadvantages of group livingmay vary depending on the position of each individual within the herd. Our objective was to study the effect of central vs. peripheralposition in the herd on feeding and vigilance behavior in male and female Pyrenean chamois and to ascertain if a group sizeeffect existed. We used focal animal sampling and recorded social interactions when a focal animal was involved. With males,vigilance rate was higher in the central part of the group than at the periphery, probably due to a higher density of animals in thecentral part of the herd and a higher probability of being disturbed by conspecifics. With females, vigilance rate did not differ accordingto position in the herd. Females spent more time feeding than males, and males showed a higher frequency of the vigilancebehavior than females. We did not observe a clear relationship between group size and vigilance behavior. The differencesin vigilance behavior might be due to social interactions
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Current Zoology
2010年02期

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