Evolutionary Genetics of New World Tree Squirrels (Tribe Sciurini)

Autor:	Linda J. Barkley, Judith M. Chupasko, Mark S. Hafner
Rok vydání:	1994
Předmět:	Ecology biology Phylogenetic tree Sciurini Microsciurus flaviventer Zoology biology.organism_classification Genetic variation Genetics Animal Science and Zoology Genetic variability Microsciurus Clade Ecology Evolution Behavior and Systematics Nature and Landscape Conservation Sciurus
Zdroj:	Journal of Mammalogy. 75:102-109
ISSN:	0022-2372 1545-1542
DOI:	10.2307/1382241
Popis:	Protein variation was analyzed electrophoretically in six species of New World tree squirrels (tribe Sciurini) representing four of five extant genera. Genetic variation was either low ( Microsciurus flaviventer —percent polymorphism = 3.7, average individual heterozygosity = 0.031) or absent ( Sciurillus pusillus ) in populations for which samples were large enough to permit analysis. Parsimony and locus-by-locus analyses of the protein data supported the close evolutionary affinity of the genera Sciurus and Microsciurus . A probability analysis of allelic distribution indicated that Tamiasciurus may be more closely related to the Sciurus – Microsciurus clade than is Sciurillus . This result supports retention of red squirrels, Tamiasciurus , within the assemblage of New World tree squirrels (Sciurini) and indicates that the high level of morphological differentiation seen in Neotropical pygmy squirrels, Sciurillus , is accompanied by a high level of genetic differentiation.
Databáze:	OpenAIRE
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