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Documents disponibles écrits par cet auteur (7)
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Article
J. Martens, Auteur ; J. Bohner, Auteur ; K. Hammerschmidt, AuteurA discriminant analysis of the call structure completely separates three Corvus taxa (levail-lantii and japonensis of the 'macrorhynchos group', splendens) inhabiting the southern slopes of the Himalayas (Nepal, Kashmir). The acoustic difference[...]
Article
J. Martens, Auteur ; S. Eck, Auteur ; Y. H. Sun, AuteurCerthia tianquanensis Li, 1995, is characterised as a distinct species and is combined with C. discolor in the superspecies C. [discolor]. This probably relict species occupies an extremely small range, and has so far been found at only four sit[...]
Article
D. T. Tietze, Auteur ; J. Martens, Auteur ; Y.-H. Sun, Auteur
Article
J. Martens, Auteur ; D. T. Tietze, Auteur ; S. Eck, Auteur ; M. Veith, AuteurPallas's Warbler (Phylloscopus proregulus) of the Eastern Palaearctic (Siberia, China, Himalayas) resolves into a complex of four closely related but distinct allospecies forming a superspecies, P. [proregulus]. Assignment of species rank is bas[...]
Article
M. Packert, Auteur ; J. Martens, AuteurTerritorial songs in island populations of songbirds are often highly divergent from those of neighbouring continental relatives. This is shown for the three goldcrest subspecies (Regulus regulus azoricus, R. r. sanctae-mariae and R. r. inermis)[...]
Article
J. Martens, Auteur ; P. Kessler, AuteurThroughout the range of the Scarlet Rosefinch, its territorial song consists of 3-9 (usually 4-5) elements, of which there are 5 different types. The differences lie in the way the pitch of the element changes in time (frequency "slope") and the[...]
Article
M. Packert, Auteur ; J. Martens, Auteur ; T. Hofmeister, AuteurThe vocal repertoire of two island populations of the Firecrest (R. ignicapillus) was studied. The song structure of R. i. balearicus from Mallorca does not differ from that of nominate ignicapillus, although intra- and interindividual variation[...]
