Functional significance of variation in trophic morphology within feeding microhabitat-differentiated cichlid species in Lake Malawi

Functional significance of variation in trophic morphology within feeding... Animal Biology , Vol. 54, No. 1, pp. 77-90 (2004) Ó Koninklijke Brill NV, Leiden, 2004. Also available online - www.brill.nl Functional signiŽ 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, signiŽ cant shape variation was identiŽ 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, http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Animal Biology Brill

Functional significance of variation in trophic morphology within feeding microhabitat-differentiated cichlid species in Lake Malawi

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Publisher
Brill
Copyright
© 2004 Koninklijke Brill NV, Leiden, The Netherlands
ISSN
1570-7555
eISSN
1570-7563
D.O.I.
10.1163/157075604323010060
Publisher site
See Article on Publisher Site

Abstract

Animal Biology , Vol. 54, No. 1, pp. 77-90 (2004) Ó Koninklijke Brill NV, Leiden, 2004. Also available online - www.brill.nl Functional signiŽ 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, signiŽ cant shape variation was identiŽ 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,

Journal

Animal BiologyBrill

Published: Jan 1, 2004

Keywords: ALGAL FEEDERS; ZOOPLANKTON FEEDERS; CICHLIDAE; THIN-PLATE SPLINE; GEOMETRIC MORPHOMETRICS

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