Sexual selection and condition-dependence
Sexual selection and condition-dependence
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DOI：
10.1111/j.1420-9101.2009.01822.x
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发表时间：
2009-12-01
影响因子：
2.1
通讯作者：
Evans, M. R.
中科院分区：
文献类型：
--
作者：
Johnstone, R. A.;Rands, S. A.;Evans, M. R.
性选择的障碍理论认为，女性更喜欢那些展示奢侈装饰品以宣传其品质或状况的伴侣。人们通常认为，由于这些装饰性特征经历了性选择的夸张，它们必然会对条件更加敏感，因此更具信息性。在这里，我们表明，这是不一定的情况。根据性状大小和成本之间关系的精确形式，表达可能会随着性状的夸张而变得或多或少地依赖于条件，或者可能保持不变。这让我们不禁要问，性信号中有多少信息内容可以归因于性选择，又有多少归因于预先存在的、自然选择的条件依赖。
The handicap theory of sexual selection suggests that females prefer mates who display extravagant ornaments that advertise their quality or condition. It is often assumed that as such ornamental traits undergo sexually-selected exaggeration, they must inevitably become more sensitive to condition, and thus more informative. Here, we show that this is not necessarily the case. Depending on the precise form of the relationship between trait size and cost, expression may become more or less condition-dependent as the trait undergoes exaggeration, or may remain unchanged. This leads us to question how much of the information content of sexual signals can be attributed to sexual selection, and how much to pre-existing, naturally-selected condition-dependence.