Apparent annual survival estimates of tropical songbirds better reflect life history variation when based on intensive field methods
Apparent annual survival estimates of tropical songbirds better reflect life history variation when based on intensive field methods
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DOI：
10.1111/geb.12661
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发表时间：
2017-12-01
影响因子：
6.4
通讯作者：
Blake, William M.
中科院分区：
文献类型：
--
作者：
Martin, Thomas E.;Riordan, Margaret M.;Blake, William M.
目的：成人生存是解释生活史策略的纬度梯度理论的核心。生活史理论预测，由于繁殖力和亲代努力较低，热带地区的成虫存活率高于北温带地区。早期的研究与这一预测一致，但近几十年的标准努力网研究表明，温带和热带地区的表观存活率高度重叠。这样的结果不符合生命史理论。在热带地区，有针对性地对繁殖成虫进行标记和重新定位产生了更高的存活率，但这种方法被认为高估了存活率，因为它没有对存活率较低的社会和年龄阶层进行抽样。我们比较了田间方法对热带生存估计的影响及其与生活史性状的关系。地点：沙巴，马来西亚婆罗洲。时间：2008-2016年。主要分类群：通道形目。方法：采用标准网法对18种热带鸣禽进行了8年的观察。我们用不同的分析方法比较了这两种野外方法的表观生存估计。结果：标准努力网的估计检测和表观生存概率与其他使用标准努力网的热带研究相似。重新观察数据证实，在研究区域有很大比例的个体在标准努力网中从未被捕获，并且许多被观察到繁殖。在所有的分析方法中，与单独的标准努力撒网相比，增加再放光产生了更高的生存估计。这些表观存活率估计高于温带物种，这与生活史的纬度差异一致。此外，通过不同物种的卵温来衡量，通过增加重植而不是单独通过标准努力网来估算的明显存活率与亲代努力相关。主要结论：包括重捕表明，标准努力网单独可以负偏倚的表观生存估计和模糊生活史的关系跨纬度和热带物种。
Aim: Adult survival is central to theories explaining latitudinal gradients in life history strategies. Life history theory predicts higher adult survival in tropical than north temperate regions given lower fecundity and parental effort. Early studies were consistent with this prediction, but standard-effort netting studies in recent decades suggested that apparent survival rates in temperate and tropical regions strongly overlap. Such results do not fit with life history theory. Targeted marking and resighting of breeding adults yielded higher survival estimates in the tropics, but this approach is thought to overestimate survival because it does not sample social and age classes with lower survival. We compared the effect of field methods on tropical survival estimates and their relationships with life history traits.Location: Sabah, Malaysian Borneo.Time period: 2008-2016.Major taxon: Passeriformes.Methods: We used standard-effort netting and resighted individuals of all social and age classes of 18 tropical songbird species over 8 years. We compared apparent survival estimates between these two field methods with differing analytical approaches.Results: Estimated detection and apparent survival probabilities from standard-effort netting were similar to those from other tropical studies that used standard-effort netting. Resighting data verified that a high proportion of individuals that were never recaptured in standard-effort netting remained in the study area, and many were observed breeding. Across all analytical approaches, addition of resighting yielded substantially higher survival estimates than did standard-effort netting alone. These apparent survival estimates were higher than for temperate zone species, consistent with latitudinal differences in life histories. Moreover, apparent survival estimates from addition of resighting, but not from standard-effort netting alone, were correlated with parental effort as measured by egg temperature across species.Main conclusions: Inclusion of resighting showed that standard-effort netting alone can negatively bias apparent survival estimates and obscure life history relationships across latitudes and among tropical species.