Mortality and other determinants of bird divorce rate
Mortality and other determinants of bird divorce rate
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死亡率和鸟类离婚率的其他决定因素
DOI：
10.1007/s00265-008-0646-9
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发表时间：
2008
影响因子：
2.3
通讯作者：
H. Kokko
中科院分区：
文献类型：
--
作者：
J. Jeschke;H. Kokko
配对关系可以以两种不同的方式结束：要么伴侣死亡，要么离婚，离婚的频率在鸟类物种之间有很大的差异，从0%到100%。为了更好地了解这种变化，我们创建并分析了迄今为止最大的数据集，包括158个物种和20个变量，这些变量量化了物种的体型，生活史，饮食和其他特征。我们的研究结果表明，离婚率高的物种有很高的死亡率，倾向于被遗弃和性二色性，殖民地生活，并形成兼职而不是持续的伙伴关系。量化身体大小或生活史的特征通常与离婚率呈非线性相关。这些非线性可能（部分）是由于相同的性状与死亡率的非线性关系，而死亡率又与离婚率呈线性关系。与以往的研究结果不同，死亡率是影响离婚率的关键因素。这是有道理的，因为随着死亡率的增加，伴侣从一年生存到下一年的可能性会降低，从而减少了试图找到其前伴侣的伴侣的可能成功率。我们还发现了离婚率的分类差异。具体来说，雁形目的离婚率非常低，然而，这可以用离婚率的一般重要决定因素来解释：他们也有较低的死亡率，较低的定居和殖民程度，以及比其他目成员更持续的伴侣关系。
Pair bonds can end in two different ways: either death of the partner or divorce, where the frequency of divorce varies enormously among bird species, from 0% to 100%. To better understand this variation, we created and analyzed the largest dataset so far, consisting of 158 species and 20 variables that quantify the species’ body size, life history, diet, and other characteristics. Our results suggest that species with a high divorce rate have a high mortality rate, tend to be ornamented and sexually dichromatic, live colonially, and form part-time rather than continuous partnerships. Traits quantifying body size or life history are often nonlinearly related with divorce rate. These nonlinearities might (partly) be caused by nonlinear relationships of the same traits with mortality rate which is, in turn, linearly related with divorce rate. In contrast to what has been found previously, mortality rate appears as a key factor for divorce rate in our study. This makes sense, as the likelihood that a partner survives from one year to the next decreases with increasing mortality rate, diminishing the likely success of a partner that attempts to locate its previous partner. We also found taxonomic differences in divorce rate. Specifically, Anseriformes have an exceptionally low divorce rate, which, however, can be explained by the generally important determinants of divorce rate: They also have a lower mortality rate, lower degree of ornamentation and coloniality, and more continuous partnerships than members of other orders.