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Biological sciences

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Trans-Beringia comparisons of mitochondrial DNA differentiation in birds

Article Abstract:

Analyses of mitochondrial DNA (mtDNA) in birds have given information on genetic variation, hybridization and population structure. The comparison of mtDNA restriction fragment profiles from samples of 13 species of birds occupying both sides of Beringia show that all except Lapland Longspur and Green-winged Teal are genetically different. The study does not reveal a similar level of mtDNA variation between putatively conspecific populations on various sides of Beringia, pointing to differing times of colonization or a stopping of gene exchange. Limited gene flow between the continents is suggested.

Analysis, Genetic aspects, Mitochondrial DNA, Birds, Zoogeography

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Different post-Pleistocene histories of Eurasian parids

Article Abstract:

A study analyzed sequence data for the complete mitochondrial ND2 gene from Parus major and P. montanus from 15 Eurasian localities, to test prior conclusions about the recent histories of these species and their taxonomic status. Analyses confirmed the absence of phylogeographic structure in both species and supported the prior refuge hypothesis for P. major, leading to the conclusion that, besides surviving the Ice Age in southeastern Asia, P. montanus sustained a relatively large population in northern Eurasian riverine thickets and then expanded eastward.

Europe, Science & research, Asia, Research, Interpretation and construction, Sparrows, Zoology, Animal taxonomy, Great tit, Eurasia

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Serial descendant primary molt or Staffelmauser in Black-crowned Night-Herons

Article Abstract:

Primary molt in Black-crowned Night-Herons (Nycticorax nycticorax) resembles serial descendant molt or Staffelmauser in other species. The molt of juvenal primaries proceeds as a single wave, in sequence from primary 1 to 7 or 8. The molt then often jumps to terminal primary 10 before the skipped primaries are molted. The juvenal primary molt of 56% of specimens has been arrested, with replacement of a median of eight primaries. The molt in 88% of adults have a minimum of two descendant waves of primary molt proceeding at the same time.

Observations, Molting, Herons

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