Does hippocampal size correlate with the degree of caching specialization?
Does hippocampal size correlate with the degree of caching specialization?
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DOI：
10.1098/rspb.2004.2912
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发表时间：
2004-12-07
影响因子：
4.7
通讯作者：
Clayton, NS
中科院分区：
文献类型：
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作者：
Lucas, JR;Brodin, A;Clayton, NS
十多年来，雀形目鸟类囤积食物的专门化程度和海马体结构的体积之间的相关性已经被接受。这种关系首先在科一级的比较中得到证实，随后在包含大量囤积物种的两个科内的物种比较中得到证实，这两个科分别是Corvidae和Paridae。最近，这种方法被批评为无效和过度适应。最近一项对预测趋势的测试与之前研究的数据汇集在一起，发现在这两个家族中都没有证据表明这种相关性。这一结果被解读为对该批评的支持。在这里，我们重新分析了原始数据集，还包括了关于几个寄生虫物种的额外新数据。我们的结果显示了各大洲之间的惊人差异，北美物种的海马体比欧亚物种的要小得多。控制大陆效应使得囤积能力与海马区结构的相关性在两个家族中都明显显著。我们讨论了大陆效应的可能原因。
A correlation between the degree of specialization for food hoarding and the volume of the hippocampal formation in passerine birds has been accepted for over a decade. The relationship was first demonstrated in family-level comparisons, and subsequently in species comparisons within two families containing a large number of hoarding species, the Corvidae and the Paridae. Recently, this approach has been criticized as invalid and excessively adaptationist. A recent test of the predicted trends with data pooled from previous studies found no evidence for such a correlation in either of these two families. This result has been interpreted as support for the critique. Here we reanalyse the original dataset and also include additional new data on several parid species. Our results show a surprising difference between continents, with North American species possessing significantly smaller hippocampi than Eurasian ones. Controlling for the continent effect makes the hoarding capacity/hippocampal formation correlation clearly significant in both families. We discuss possible reasons for the continent effect.