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7 results for “Gloger's Rule”
Data from: Gloger's rule or historical conjecture? Tests in mammals
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Rethinking Gloger's Rule: climate, light environments and color in a large family of tropical birds (Furnariidae)
Ecogeographic rules provide a framework within which to test evolutionary hypotheses of adaptation. Gloger's rule predicts endothermic animals should have darker colors in warm and rainy climates. This rule also predicts animals should be redder in warm and dry climates, the so-called "complex Gloger's rule." Empirical studies frequently demonstrate that animals are darker in cool and wet rather than warm and wet climates. Further, sensory ecology predicts that, to enhance crypsis, animals should be darker in darker light environments. We aimed to disentangle the effects of climate and light environments on plumage brightness and redness in the large Neotropical passerine family Furnariidae. Birds in cooler and rainier climates had darker plumage, even after controlling for habitat type. Birds in darker habitats had darker plumage, even after controlling for climate. The effects of temperature and brightness interact so that the negative effect of precipitation on brightness is strongest in cool temperatures. Finally, birds tended to be redder in warm and dry habitats but also, surprisingly, in cool and wet locales. We suggest Gloger's rule results from complementary selective pressures arising from myriad ecological factors, including crypsis, thermoregulation, parasite deterrence and resistance to feather abrasion.
Testing the simple and complex versions of Gloger's rule in the Variable Antshrike (Thamnophilus caerulescens, Thamnophilidae)
<p>Gloger's rule is a classic ecogeographical principle that, in its simplest version, predicts animals should be darker in warmer and wetter climates. In a rarely-tested more complex version, it also predicts animals should be more rufous in warmer and drier climates. The Variable Antshrike is a widely-distributed South American passerine that presents an impressive amount of plumage color variation and occupies a wide variety of climatic conditions. Moreover, genetic and vocal evidence indicate ongoing hybridization in south-central Bolivia among three populations with very distinct plumages. We collected color data from 232 specimens from throughout this species' distribution to test the predictions of Gloger's rule. We found a negative correlation between brightness and precipitation, consistent with the simple version of Gloger's rule. In contrast, we found that birds were darker in cooler climates, contrary to the simple version of Gloger's rule, but consistent with recent findings in other taxa. We found support for both predictions of complex Gloger's rule and suggest it might be driven by background matching. We conclude by concurring with a recent suggestion that the simple version of Gloger's rule should be reformulated exclusively in terms of humidity.</p>
Rethinking Gloger’s Rule: climate, light environments and color in a large family of tropical birds (Furnariidae)
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Testing the simple and complex versions of Gloger’s rule in the Variable Antshrike (Thamnophilus caerulescens, Thamnophilidae)
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Data from: Darker where cold and wet: Australian birds follow their own version of Gloger's rule
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Data from: Plumage coloration follows Gloger’s rule in a ring species
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