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Species composition of dabbling duck assemblages: ecomorphological patterns compared with null models
Evo Game Research Station, Finnish Game and Fisheries Research Institute.
Department of Animal Ecology, Swedish University of Agricultural Sciences, Umeå. (Akvatisk biologi och kemi)
Department of Applied Zoology, University of Helsinki.
Department of Animal Ecology, Swedish University of Agricultural Sciences, Umeå.
1994 (engelsk)Inngår i: Oecologia, ISSN 0029-8549, E-ISSN 1432-1939, Vol. 98, nr 2, s. 193-200Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Ecomorphological patterns of breeding dabbling duck (Anas spp.) assemblages were studied in six regions in northern Europe. Observed spacings among species in terms of bill lamellar density and body length were compared with expected spacings based on null models incorporating different levels of constraints (regional species pools, species relative abundances, lake size and habitat requirements of species). Deviations of observed spacings from expected ones were compared with prey abundance and prey size diversity in the lakes. Observed spacings in terms of body length, but not in terms of bill lamellar density, were greater than expected on the basis of null models. The most abundant species were generally relatively more different than less abundant species in terms of body length but not in terms of bill lamellar density. Deviations between observed and expected spacings in terms of body length were more like those predicted by the competition hypothesis in lakes with low food abundance than in lakes with high food abundance. Patterns in bill lamellar spacings were not related to food abundance nor to food size diversity. In general, patterns in body length spacings were consistent with the competition hypothesis whether the null model used in comparisons was constrained or not.

sted, utgiver, år, opplag, sider
1994. Vol. 98, nr 2, s. 193-200
Emneord [en]
SPECIES COMPOSITION, BODY LENGTH, BILL LAMELLAR DENSITY, NULL MODELS, COMPETITION, ANAS-CRECCA, SIZE RATIOS, COMMUNITIES, ECOLOGY, GUILD, HYPOTHESIS, WATERFOWL, DYNAMICS, TEAL
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URN: urn:nbn:se:hkr:diva-5399DOI: 10.1007/BF00341472ISI: A1994NW26600011ISBN: 0029-8549 (tryckt)OAI: oai:DiVA.org:hkr-5399DiVA, id: diva2:320642
Tilgjengelig fra: 2010-05-26 Laget: 2009-12-07 Sist oppdatert: 2017-12-12bibliografisk kontrollert

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