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   <subfield code="a">10.1007/s10336-007-0127-3</subfield>
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   <subfield code="a">Morphological versus acoustic analysis: what is the most efficient method for sexing yelkouan shearwaters Puffinus yelkouan ?</subfield>
   <subfield code="h">[Elektronische Daten]</subfield>
   <subfield code="c">[Karen Bourgeois, Charlotte Curé, Jérôme Legrand, Elena Gómez-Díaz, Eric Vidal, Thierry Aubin, Nicolas Mathevon]</subfield>
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   <subfield code="a">Sexing monomorphic seabirds is particularly difficult, and available methods have various disadvantages, such as seasonal non-applicability or stress induction. The yelkouan shearwater Puffinus yelkouan is a poorly studied seabird endemic to the Mediterranean basin. Ecological and biological data are needed for this species, thus necessitating the development of appropriate field methods. Here, we tested two methods for sexing yelkouan shearwaters: the classical morphological method and a new acoustic method. Morphological analysis demonstrated sexual differences in head, leg and feather measurements, with a high degree of overlap resulting in only 87.2% accuracy. In contrast, acoustic analysis showed that the highest value of the fundamental frequency (FC) and duration of the clear note of calls did not overlap between males and females. Yelkouan shearwaters can be sexed with 100% accuracy by measuring FC. If FC&lt;678.4Hz, the bird is female, while if FC&gt;678.4Hz, the bird is male. Other advantages of this method are its simplicity and non-invasiveness, which are particularly important for a potentially threatened species.</subfield>
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   <subfield code="a">Dt. Ornithologen-Gesellschaft e.V., 2007</subfield>
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   <subfield code="a">Acoustic parameters</subfield>
   <subfield code="2">nationallicence</subfield>
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   <subfield code="a">Morphometry</subfield>
   <subfield code="2">nationallicence</subfield>
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   <subfield code="a">Puffinus yelkouan</subfield>
   <subfield code="2">nationallicence</subfield>
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   <subfield code="a">Sexing methods</subfield>
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   <subfield code="a">Sexual dimorphism</subfield>
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   <subfield code="a">Bourgeois</subfield>
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   <subfield code="u">Institut Méditerranéen d'Ecologie et de Paléoécologie (UMR CNRS 6116), Université Paul Cézanne, Europôle Méditerranéen de l'Arbois, Av. Philibert, BP 80, 13545, Aix-en-Provence cedex 04, France</subfield>
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   <subfield code="a">Curé</subfield>
   <subfield code="D">Charlotte</subfield>
   <subfield code="u">Equipe ‘Communications Acoustiques', Laboratoire de Neurobiologie de l'Apprentissage, de la Mémoire et de la Communication (UMR CNRS 8620), Université Paris-Sud, Bât. 446, 91405, Orsay cedex, France</subfield>
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   <subfield code="a">Legrand</subfield>
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   <subfield code="u">Institut Méditerranéen d'Ecologie et de Paléoécologie (UMR CNRS 6116), Université Paul Cézanne, Europôle Méditerranéen de l'Arbois, Av. Philibert, BP 80, 13545, Aix-en-Provence cedex 04, France</subfield>
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   <subfield code="u">Department de Biologia Animal (Vertebrats), Facultad de Biologia, Universidad de Barcelona, Av. Diagonal 645, 08028, Barcelona, Spain</subfield>
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   <subfield code="a">Aubin</subfield>
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   <subfield code="u">Equipe ‘Communications Acoustiques', Laboratoire de Neurobiologie de l'Apprentissage, de la Mémoire et de la Communication (UMR CNRS 8620), Université Paris-Sud, Bât. 446, 91405, Orsay cedex, France</subfield>
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   <subfield code="a">Mathevon</subfield>
   <subfield code="D">Nicolas</subfield>
   <subfield code="u">Equipe ‘Communications Acoustiques', Laboratoire de Neurobiologie de l'Apprentissage, de la Mémoire et de la Communication (UMR CNRS 8620), Université Paris-Sud, Bât. 446, 91405, Orsay cedex, France</subfield>
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   <subfield code="t">Journal of Ornithology</subfield>
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   <subfield code="g">148/3(2007-07-01), 261-269</subfield>
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