Journal Title
Title of Journal: Environ Biol Fish
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Abbravation: Environmental Biology of Fishes
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Publisher
Springer Netherlands
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Authors: Yakuta Bhagat Michael G Fox Maria Teresa Ferreira
Publish Date: 2011/03/22
Volume: 91, Issue: 2, Pages: 203-217
Abstract
Introduced pumpkinseed in Iberian reservoirs display marked external morphological differentiation along two simultaneous dimensions of flow and trophic structure We assessed the degree of internal morphological differentiation using gill rakers pharyngeal jaws and the levator posterior muscle among pumpkinseeds occupying four different habitats and determined whether prey consumption accounted for any discernible differences in feeding structures among ecomorphs Results showed significant differentiation by habitat based on pharyngeal muscle and jaw dimensions in all study reservoirs with pelagic pumpkinseeds having smaller jaws than littoral pumpkinseeds in four of the five reservoirs Gill rakers however differentiated morphs in only three of the five reservoirs corresponding to differences in zooplankton consumption among pelagic and littoral individuals in those reservoirs Based on all internal morphological traits greater divergence was seen along the littoralpelagic trophic axis in the lacustrine zones of reservoirs compared to the fluvial zone Overall differences noted in internal morphology are likely the result of phenotypic plasticity the ability of this species to readily adapt to changing physical environments may explain the success of the pumpkinseed in its introduced rangeWe wish to thank A Albuquerque R Rivaes C Abreu and J Santos for their assistance with field collections and K Chinachaimongkol S Gan D Hogan and J Perdue for all their assistance in the lab We are also grateful to B Robinson C Ruetz and two anonymous reviewers for their insightful comments and suggestions which greatly helped to improve the manuscript This study was funded by a National Science and Engineering Research Council of Canada Discovery Grant and a NATO Science Programme Collaborative Linkage Grant to MGF Funding was also provided by National Water Institute Ecological Quality and Integrated Management of Reservoirs to MTF
Keywords:
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- Prey use of wetland benthivorous sunfishes: ontogenetic, interspecific and seasonal variation
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- Endocrinological investigation into the reproductive cycles of two sympatric skate species, Malacoraja senta and Amblyraja radiata , in the western Gulf of Maine
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