Kentish versus snowy plover: Phenotypic and genetic analyses of Charadrios Alexandrinus Reveal divergence of Eurasian and American subspecies

Clemens Küpper, Jakob Augustin, András Kosztolányi, Terry Burke, J. O.R.D.I. Figuerola, Tamas Székely

Research output: Contribution to journalArticle

50 Citations (Scopus)

Abstract

Many shorebird species have widespread geographic distributions comprising several continents. Because shorebirds are excellent flyers and can migrate large distances, it is often unclear whether reproductive barriers between subspecies and populations from different continents exist. Kentish-Snowy Plovers (Charadrius alexandrinus) are cosmopolitan shorebirds. Whether the American and Eurasian subspecies - Snowy Plover and Kentish Plover, respectively - constitute a single species is the subject of a longstanding debate. We examined the divergence between American and Eurasian populations to reassess the current taxonomy by comparing genetic and phenotypic characters of the American subspecies C. a. nivosus and the Eurasian subspecies C. a. alexandrinus from seven populations. Genetic analyses revealed that American and Eurasian populations have strongly diverged, the Kentish Plover being more closely related to the White-fronted Plover (C. marginatus) than to the Snowy Plover. These results were consistent across all assessed nuclear markers (26 microsatellites and a partial CHD sequence) and two mitochondrial markers (ND3 and ATPase 6/8). Within subspecies, populations sampled across large geographic distances were not genetically differentiated (all Fst ≤ 0.01 and all φ st ≤ 0.06), which suggests panmixia. Snowy Plovers differed morphologically from Kentish Plovers, having significantly shorter tarsi and wings. Chick plumage and calls also may serve as diagnostic characters to distinguish Snowy and Kentish plovers, although more data are needed to quantify these differences. Our combined results suggest that the taxonomic status of C. alexandrinus needs to be revised, and we propose that Kentish Plover and Snowy Plover be recognized as separate species: C. alexandrinus and C. nivosus, respectively.

Original languageEnglish
Pages (from-to)839-852
Number of pages14
JournalAuk
Volume126
Issue number4
DOIs
Publication statusPublished - Oct 2009

Keywords

  • Charadrius alexandrinus
  • Kentish Plover
  • Microsatellites
  • Mitochondrial DNA
  • Population differentiation
  • Snowy Plover

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Animal Science and Zoology

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