Can information sharing explain recruitment to food from communal roosts?
Can information sharing explain recruitment to food from communal roosts?
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DOI：
10.1093/beheco/13.1.42
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发表时间：
2002-01-01
影响因子：
2.4
通讯作者：
Dall, SRX
中科院分区：
文献类型：
--
作者：
Dall, SRX
关于公共巢穴和栖息地是否主要作为信息中心（它们促进觅食信息的共享）的争论仍未解决。在这里，我使用进化博弈论来研究这一有影响力的假设和另一种选择的相对重要性：特别是栖息地，作为招募中心（它们促进了食物斑块的聚集）。基于我对幼年乌鸦（Corvus corax）行为的模型，我假设成群结队地呆在食物斑块上没有净成本，觅食者是集体栖息的。此外，一个战略结果是观察到的乌鸦行为：个体独立搜索，一旦找到补丁就从巢穴招募（他们玩搜索和招募，或SR）。我在两种情况下研究了这种稳定性，这两种情况不同于在其他策略群体中使用SR的突变体损失的机会成本。当这些代价只涉及到在某个位置的胴体上不属于群体的机会时，SR是所有条件下唯一进化稳定的策略。然而，当这些成本还包括失去成为社会主导的机会时，SR就不再在战略集中享有独占的主导地位。然而，在这两种情况下，群体觅食利益对sr的进化稳定性没有影响。因此，与文献中的断言相反，分享觅食信息的机会足以推动进化和维持从公共栖息地招募食物的能力。然而，我的结论是，在我的焦点系统中，信息和群体利益都可能是公共栖息行为的基础。
The debate over whether communal nests and roosts function primarily as information centers (they facilitate the sharing of foraging information) remains unresolved. Here I use evolutionary game theory to investigate the relative importance of this influential hypothesis and an alternative: that roosts, in particular, function as recruitment centers (they facilitate aggregation at food patches). Basing my model on juvenile common raven (Corvus corax) behavior, I assume there is no net cost to being at food patches in groups, and foragers roost communally. Moreover, one strategic outcome is the observed raven behavior: individuals search independently and recruit from the roost once a patch is found (they play Search-and-Recruit, or SR). I investigate the stability of this in two scenarios that differ in the magnitude of the lost opportunity costs to mutants playing SR in populations of other strategies. When these costs only involve a chance of not being in a group at a located carcass, SR is the only evolutionarily stable strategy under all conditions. However, when these costs also include missing opportunities to be socially dominant, SR no longer enjoys exclusive dominance in the strategy set. Nevertheless, in both cases, there are conditions where group foraging benefits have no effect on the evolutionary stability of SR. Thus, contrary to assertions in the literature, the opportunity to share foraging information can be sufficient to drive the evolution and maintenance of recruitment to food from communal roosts. However, I conclude that both information and grouping benefits are likely to underlie communal roosting behavior in my focal system.