No evidence for adaptive suppression of joint laying by dominant female Seychelles warblers: an experimental study
No evidence for adaptive suppression of joint laying by dominant female Seychelles warblers: an experimental study
复制标题
DOI：
10.1163/156853905774831864
复制
发表时间：
2005-11-01
期刊：
影响因子：
1.3
通讯作者：
Komdeur, J
中科院分区：
文献类型：
--
作者：
Komdeur, J
有几个理论框架可以解释生活在社会群体中的同性个体之间的生殖分配差异。为了充分确定这一点，我们需要知道哪一方更有能力操纵另一方的繁殖。理论模型往往回避这个问题，假设支配者完全或部分控制从属者的繁殖。这项研究清楚地表明，在合作繁殖塞舌尔莺（Acrocephalus sechellensis），这一假设是不符合的。塞舌尔莺全年占据不同质量的领土（以可获得的昆虫食物量衡量）。联合产卵，其中占主导地位的和从属的女性产卵在同一个巢，降低了适合的初级女性在低质量的领土，但不石油优质领土。本研究发现，低质量领地上的优势雌虫不存在抑制或阻止从属雌虫联合产卵的模式：（1）多雌虫群体联合产卵的频率与领地质量无关：（2）无论在低质量还是高质量领地，产卵前后巢内雌虫之间都不存在攻击行为;（iii）在产下自己的卵之前或之后，占优势的雌性不会移走其他雌性的卵或实验引入的卵。(iv)占主导地位的女性不拒绝通过巢遗弃实验介绍的鸡蛋。由于没有生殖控制，需要更多地关注脊椎动物社会中生殖分区的替代模型，并且现实的模型必须考虑性别内的相互作用。
Several theoretical frameworks exist for explaining variation in reproductive allocation between same-sex individuals living within social groups. To determine this adequately, we need to know which party is more able to manipulate reproduction of the other. Theoretical models often sidestep this problem by making the assumption that dominants either have complete or partial control of reproduction by subordinates. This Study clearly indicates that in the cooperatively breeding Seychelles warbler (Acrocephalus sechellensis) this assumption is not met. Seychelles warblers occupy year-round territories of different quality (measured as amount of insect food available). Joint laying, in which the dominant and subordinate females lay eggs in the same nest, decreases the fitness of primary females on low-quality territories, but not oil high-quality territories. This study found good experimental evidence that dominant females on low-quality territories have no modes to Suppress or prevent subordinate females from joint laying: (i) The frequency of joint laying in multi-female groups is independent of territory quality; (ii) There is no aggression among females at the nest around the time of egg laying at either low- or high-quality territories; (iii) Dominant females do not remove the other female's egg or experimentally introduced eggs, before or after laying their own. (iv) Dominant females do not reject an experimentally introduced egg through nest desertion. Given the absence of reproductive control, increased attention to alternative models of reproductive partitioning in vertebrate societies is needed and a realistic model has to take into account interactions within the sexes.