Determinants of chorus tenure in barking treefrogs (Hyla gratiosa)
Determinants of chorus tenure in barking treefrogs (Hyla gratiosa)
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吠叫树蛙（Hyla gratiosa）合唱团任期的决定因素
DOI：
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发表时间：
1994
影响因子：
2.3
通讯作者：
Chistopher G. Murphy
中科院分区：
文献类型：
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作者：
Chistopher G. Murphy
在迄今为止研究的所有无尾两栖动物物种中，雄性交配成功与雄性合唱团任期（雄性出现在繁殖聚集体中的夜晚数量）呈正相关，但雄性只在整个繁殖季节的一小部分时间进行合唱。三种假设可以解释无尾两栖动物的合唱团任期缩短：（1）死亡率，（2）能量限制，以及（3）合唱团之间的运动。我在对吠叫树蛙（Hyla gratiosa）的研究中测试了这些假设，这是一种合唱团任期非常短的物种。死亡率是一些男性任期较短的原因：估计有 20% 的男性在合唱团中死亡。能量限制是合唱团任期的一个重要决定因素。男性在合唱团的连续几个晚上体重减轻，与合唱团任期较短的男性相比，合唱团任期较长的男性在合唱团的第一个晚上的状况较好，体重下降较慢，在合唱团的最后一个晚上的状况较差。当蟋蟀离开合唱队时，我喂它们的雄性比对照组（未喂食的）雄性蟋蟀回来得更快，时间也更长。池塘之间的移动并不能解释合唱团任期缩短的原因：不到 16% 的雄性在多个池塘进行召唤，而这些雄性通过召唤另一个合唱团将其合唱团任期中位数仅增加了 2.5 个晚上。因此，H. gratiosa 的合唱团任期缩短似乎主要是能量限制的结果，死亡率是次要的。
In all species of anuran amphibians studied to date, male mating success is positively correlated with male chorus tenure (the number of nights that a male is present in breeding aggregations), yet males spend only a small portion of the total breeding season in choruses. Three hypotheses might explain abbreviated chorus tenure in anuran amphibians: (1) mortality, (2) energy limitations, and (3) movement among choruses. I tested these hypotheses in a study of the barking treefrog (Hyla gratiosa), a species with very abbreviated chorus tenure. Mortality accounted for the short tenures of some males: an estimated 20% of males died while calling in the chorus. Energy limitations were an important determinant of chorus tenure. Males lost weight over successive nights in the chorus, and males with longer chorus tenures were in better condition on their first night in the chorus, lost condition more slowly, and were in poorer condition on their last night in the chorus than were males with shorter chorus tenures. Males that I fed crickets as they left the chorus returned sooner and for more nights than did control (unfed) males. Movement between ponds did not explain abbreviated chorus tenure: less than 16% of the males called at more than one pond, and these males increased their chorus tenures by a median of only 2.5 nights by calling in another chorus. Thus, abbreviated chorus tenure in H. gratiosa appears to be primarily the result of energy limitations, with mortality playing a secondary role.