Animal Biology , Vol. 53, No. 3, pp. 259-301 (2003) Ó Koninklijke Brill NV, Leiden, 2003. Also available online - www.brill.nl Con icting demands on the trophic system of Anseriformes and their evolutionary implications ANGÉLIQUE H.J. VAN DER LEEUW, KARIN KURK, PETER C. SNELDERWAARD, RON G. BOUT, HERMAN BERKHOUDT Department of Evolutionary Morphology, Institute of Evolutionary and Ecological Sciences, Leiden University, Kaiserstraat 63, 2311 GP Leiden, The Netherlands Abstract —Within the Anseriformes, the Anatinae (ducks) shows a wide variation in diet and feeding mechanisms, in contrast to the Anserinae (geese and swans). While grazing is common in the Anserinae, only few species within the Anatinae use terrestrial grazing as their main feeding mechanism (e.g., wigeons). This may be explained by con icting functional demands of grazing and lter-feeding on the trophic system. In this study, the feeding performance, feeding mechanisms and oropharyngeal anatomy is compared between geese, wigeon and a general lter-feeder/pecker, the mallard ( Anas platyrhynchos ). The results show that the functional demands of lter-feeding and grazing are con icting: lter-feeding requires a bald palatal surface and under-tongue transport for optimal functioning of the lingual cushion as a piston, whereas the transport
Animal Biology – Brill
Published: Jan 1, 2003
Keywords: FEEDING; OROPHARYNX; AVES; DEVELOPMENT; TROPHIC SYSTEM; ANSERIFORMES; MORPHOLOGY
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