Animal Biology , Vol. 54, No. 1, pp. 77-90 (2004) Ó Koninklijke Brill NV, Leiden, 2004. Also available online - www.brill.nl Functional signi cance of variation in trophic morphology within feeding microhabitat-differentiated cichlid species in Lake Malawi DAUD KASSAM 1 ; , DEAN C. ADAMS 2 and KOSAKU YAMAOKA 1 1 Department of Aquaculture, Kochi University, B 200 Monobe, Nankoku-shi, Kochi, 783-8502, Japan 2 Department of Ecology, Evolution and Organismal Biology, Iowa State University, Ames, Iowa 50010, USA Abstract —Shape variation in trophic morphology between species in two trophic guilds (zooplankton and epilithic algal feeders) was investigated using landmark-based geometric morphometrics. Three disarticulated bone elements from the head region were examined; the neurocranium, the premaxilla and lower jaw. From separate analyses of each bone element, signi cant shape variation was identi ed between species in each trophic guild. The deformation grids generated revealed that, for the zooplankton feeders, Ctenopharynx pictus has a longer neurocranium, a longer and ventrally directed vomer, a larger orbit, a shorter ascending arm, a shorter maxillad spine, and a more compressed articular bone relative to Copadichromis borleyi . In algal feeders, Labeotropheus fuelleborni has a shorter neurocranium, a smaller orbit, a ventrally directed vomer,
Animal Biology – Brill
Published: Jan 1, 2004
Keywords: ALGAL FEEDERS; ZOOPLANKTON FEEDERS; CICHLIDAE; THIN-PLATE SPLINE; GEOMETRIC MORPHOMETRICS
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