Altitudinal distribution of birds in the Sierra Madre Del Sur, Guerrero, Mexico

Article Abstract:

Structures of avian altitudinal distribution and ecological characteristics of the avifauna of the Sierra Madre del Sur were studied. Species richness was greatest at the two lowest altitudes and declined with increasing altitudes. Richness is relatively uniform within habitat types, but species turnover is rampant between habitat types. Habitat structure determines the avian altitudinal distribution, and interspecific competition has a weak effect. The modification and destruction of the habitat by humans also play an important role in avian altitudinal distribution patterns.

Natural history, Bird populations, Habitat partitioning (Biology), Habitat partitioning (Ecology), Competition (Biology), Sierra Madre (Mexico)

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Geographic variation in coloration and morphology of the Acorn Woodpecker

Article Abstract:

The geographic variation in coloration and morphology of Acorn Woodpeckers was investigated. One thousand five hundred and thirty-one study skins of Acorn Woodpeckers from 16 museum collections were studied with respect to locality, elevation above sea level, date of collection, iris color, sex and age. All measurements were made using the same set of calipers to ensure accuracy. Highly significant geographic differences in coloration and morphology were observed between the species.

Woodpeckers, Morphology (Animals), Animal morphology

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