A test of a corollary of Allen's rule suggests a role for population density

A test of a corollary of Allen's rule suggests a role for population density
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对艾伦规则推论的检验表明人口密度的作用

DOI:
10.1111/jav.02116
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发表时间:
2019
影响因子:
1.7
通讯作者:
Walsh, Jennifer
Walsh, Jennifer
中科院分区:
生物学3区
文献类型:
--
作者:
Olsen, Brian J.;Froehly, Jennifer L.;Borowske, Alyssa C.;Elphick, Chris S.;Field, Christopher R.;Kocek, Alison R.;Kovach, Adrienne I.;Longenecker, Rebecca A.;Shriver, W. Gregory;Walsh, Jennifer

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由Russell Greenberg, Glenn Tattersall和他们的同事进行的一项研究提出了Allen法则的一个推论:在淡水有限的环境中,bill表面积随着温度的升高而增加。然而,种群密度和两性二态性的增加也可以解释喙表面积的增加。在控制了杂交区域的影响后,我们测试了盐沼麻雀ammospiza caudacuta(一种性别单一的河口专家)的温度或种群密度是否解释了喙表面积的更大差异。这使我们能够检查格林伯格-塔特萨尔推论背后的多种潜在选择机制。我们发现,盐沼麻雀遵循一般的推论模式(在温暖的夏季气候下,喙更大),但只有在控制了种群密度之后。喙表面积与温度的关系与种群密度成反比。我们讨论了性选择和生态竞争的相对能力来解释这些结果。
A body of research by Russell Greenberg, Glenn Tattersall and their colleagues has proposed a corollary of Allen's Rule: that in freshwater‐limited environments, bill surface area increases with temperature. Increases in both population density and sexual dimorphism, however, could also explain increases in bill surface area. After controlling for the effects of a hybrid zone, we tested whether temperature or population density in the saltmarsh sparrowAmmospiza caudacuta, a sexually monomorphic estuarine specialist, explained greater variance in bill surface area. This allowed us to examine multiple potential selective mechanisms underlying the Greenberg–Tattersall corollary. We found that saltmarsh sparrows follow the general pattern of the corollary (larger bills in warmer summer climates) but only after controlling for population density. The relationship between bill surface area and temperature varied inversely with population density. We discuss the relative abilities of sexual selection and ecological competition to explain these results.
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