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Morphology and distribution of the Chinese Grey Shrike (Lanius sphenocercus) in China
Abstract
Basingon the biometricsof24 individualsfromcollections of the InstituteofZoology,Chinese Academyof Scienceswe foundthat femalesof Lanius sphenocercus were in generalbiggerin size(wing, tail) and heavierthan the males,as is commonin birdsofprey. Furthermore, it appearsthatmorphological measurements(wing,tail, bill, tarsus lengthand weight)are not as importantfor distinguishingbetween the two races as the colourvariationin the amountof white in the superciliarystripesand foreheadbase. Distributionaldata coincide with the presentknowledgegiven in literature.
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Efforts to document the decline of extant populations require a historical record of previous occurrences. Natural history museums contain such information for most regions of the world, at least at a coarse spatial scale. Museum collections have been successfully used to analyse declines in a wide range of plants and animals, at spatial scales ranging from single localities to large biotic and political regions. Natural history museum collections, when properly analysed, can be an invaluable tool in documenting changes in biodiversity during the past century.
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