Cooperative provisioning dynamics: fathers and unrelated helpers show similar responses to manipulations of begging
Cooperative provisioning dynamics: fathers and unrelated helpers show similar responses to manipulations of begging
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DOI：
10.1016/j.anbehav.2008.10.009
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发表时间：
2009-02-01
期刊：
影响因子：
2.5
通讯作者：
Wright, Jonathan
中科院分区：
文献类型：
--
作者：
McDonald, Paul G.;Kazem, Anahita J. N.;Wright, Jonathan
在双亲代系统中，一对成员之间的合作供给动力学在经验和理论上都受到了广泛的关注。然而，在合作繁殖群体中，供应的动态仍然知之甚少。这样的组通常包括不相关的帮助者，他们的配置规则可能与相关帮助者和父母非常不同，因为他们从帮助中获得不同类型的健康益处。黑斑马诺里纳（Manorina melanophrys）提供了一个理想的系统来研究合作供应，因为每个巢穴的大量照顾是由许多不相关的帮手提供的。我们在实验中通过有针对性的央求回放来增加育雏需求，这些央求回放分别是在有繁殖能力的雄雀或无亲缘关系的雄雀访巢期间进行的。这两种类型的雄性都使用了类似的行为投资规则，在回放期间，相对于控制期，它们显著增加了食物交付率。令人惊讶的是，所有其他提供者在回放期间也增加了访问率，尽管程度较小。这只能是对目标个体访问次数增加的反应，这表明在这种合作环境中个体评估育雏需求的另一种间接机制。在回放期间，食物传递的总体增加导致雏鸟表现出预期的乞讨减少和体重增加。因此，有趣的是，对于所有类型的群体成员来说，进化的供应反应是多么的相似，而不管这种对后代投资的好处是通过亲属选择（父亲）获得的，还是通过未来的适应性直接增加（帮手）获得的。(C) 2008动物行为研究协会。Elsevier Ltd.出版。版权所有。
Cooperative provisioning dynamics between members of a pair in biparental systems has received a lot of attention, both empirically and theoretically. The dynamics of provisioning in cooperatively breeding groups, however, remains poorly understood. Such groups often include unrelated helpers that may have very different provisioning rules from related helpers and parents, since they accrue different types of fitness benefits from helping. The bell miner, Manorina melanophrys, provides an ideal system in which to investigate cooperative provisioning, because substantial levels of care are provided by a number of unrelated helpers per nest. We experimentally increased brood demand via targeted begging playbacks during nest visits of either breeding males or unrelated male helpers. Both types of males used similar behavioural investment rules, significantly increasing food delivery rate during playback relative to control periods. Surprisingly, all other provisioners also increased their visit rates during playbacks, although to a lesser extent. This could only have been in response to the increase in visits by the target individuals, suggesting an additional indirect mechanism by which individuals in this cooperative setting assess brood demand. The resultant overall increase in food delivery during the playback periods caused nestlings to show the expected reduction in their own begging and an increase in body mass gain. It is therefore interesting how similar the evolved provisioning responses are for all types of group member, irrespective of whether such benefits of investment in the brood are derived via kin selection (fathers) or some future direct increase in fitness (helpers). (C) 2008 The Association for the Study of Animal Behaviour. Published by Elsevier Ltd. All rights reserved.