Effect of Body Size on the Resource Holding Potential of Male Varied Tits Parus varius
Effect of Body Size on the Resource Holding Potential of Male Varied Tits Parus varius
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体型对雄性变异山雀资源持有潜力的影响
DOI：
10.3838/jjo.50.65
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发表时间：
2001
期刊：
影响因子：
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通讯作者：
Katsura K. Kawano
中科院分区：
文献类型：
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作者：
Noriyuki M. Yamaguchi;Katsura K. Kawano
在许多物种中，雄性的资源持有潜力（Resource holding potential， RHP）严重影响着雄性的适合度。我们研究了(1)雄性山雀的RHP，如优先获得食物和成功获得繁殖地点，是否存在差异；(2)如果存在差异，影响雄性山雀RHP的因素是什么。通过对冬季人工饲养中攻击性相互作用的观察，我们发现14只雄性的优势等级呈线性关系。跗齿的长度影响了获得食物的优先权。然而，目前尚不清楚获取食物的优先顺序如何影响山雀在野外的生存。在繁殖季节，14只雄性中有8只没有使用研究区域的巢箱。在冬季，繁殖雄虫的优势相互作用比例高于非繁殖雄虫。非繁殖期雄虫的跗趾比繁殖期雄虫的跗趾短，但差异不显著。这些事实表明，雄性RHP对其繁殖的可能性有重要影响。繁殖雄性的繁殖成功率与跗骨长度无关。这表明，产卵开始后，雄性体型对繁殖性能没有影响。
Resource holding potential (RHP) of males seriously affects their fitness in many species. We examined (1) whether RHP, such as priority access to food and success in obtaining a breeding place, differs among males and (2) if so, what factors affect RHP in male Varied Tits. Based on the observation of aggressive interactions at an artificial feeder in winter, we recognized a dominance rank linearity among fourteen males examined. Tarsus length affected priority for access to food. However, it is not known how priority for access to food affects a Varied Tit's survival in field. In the breeding season, eight of 14 males did not use nest boxes in the study area. Breeding males had a higher proportion of dominant interactions in winter than non-breeding males. Non-breeding males tended to have shorter tarsi than breeding males, although the difference was not significant.These facts suggest that male RHP has an important effect on their possibility of breeding. Reproductive success of breeding males did not correlate with tarsus length. This suggests that male body size did not affect the breeding performance once egg laying began.