Macrogeographic patterns of morphometric and genetic variation in the sage sparrow complex

Article Abstract:

There is a compatibility of morphometric and genetic patterns across geography in three subspecies of the Sage Sparrow namely, Amphispiza belli (A.b.) belli, A.b. canescens and A.b. nevadensis. These three subspecies are each distinctive, integrated evolutionary units. A.b. belli and A.b. canescens are each other's closest relative morphologically and genetically, and both are sedentary. A.b. nevadensis, which is migratory, and A.b. canescens are very different morphologically and genetically. Migratory populations are more heterozygous than sedentary populations.

Genetic aspects, Sparrows, Animal genetics

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Plumage and size variation in the mourning warbler

Article Abstract:

The Mourning Warbler (Oporornis philadelphia) is highly variable throughout its breeding range. Its plumage, skeletal and external measurements follow a haphazard pattern of variation. Thus, evolutionary units are not apparent in this taxon. The Mourning Warbler does not conform to predictions based on Bergmann's rule. There seems to be no relationship between climatic and skeletal variables. Environmental selection does not play a role in shaping the pattern of breeding ground variability. These suggest an extensive gene flow between populations of this species.

North America, Natural history, Bird populations, Animal anatomy

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Speciation in Vireos. I. Macrogeographic patterns of allozymic variation in the Vireo Solitarius complex in the contiguous United States

Article Abstract:

A study of the genetic relationships of four subspecies of Solitary Vireo suggests a certain level of gene flow between populations of V.s. cassinii and V.s. plumbeus. Allozymic variation shows that V.s. plumbeus is a fully-differentiated species as there is a significant genetic discontinuity between V.s. plumbeus and three other allopatric forms. Although allozymically V.s. cassinii and V.s. solitarius are similar, they differ in vocal quality and the number of base pair substitutions in mtDNA.

Analysis, Evolution (Biology), Origin of species, Bird breeding, Genetic research

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