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: Brook O Swanson Alice C Gibb Jane C Marks Dean A Hendrickson
Publish Date: 2007/12/04
Volume: 83, Issue: 2, Pages: 147-154
Abstract
We examined foraging behavior microhabitat use and feeding behavior in a trophically polymorphic cichlid fish Herichthys minckleyi to address several questions regarding resource partitioning in this threatened species These include 1 do morphotypes demonstrate different foraging behaviors 2 do individuals within a morphotype vary in their foraging behavior eg are some individuals specialists only using a subset of available resources while other are generalists 3 do foraging behaviors vary between isolated pools 4 do foraging behaviors vary across seasons We quantified microhabitat use and feeding behavior for over 100 individuals of two morphotypes feeding freely in two isolated pools populations and across two seasons winter and summer We found differences in foraging behavior between morphotypes and individual specializations within morphotypes ie some individuals specialize on certain food resources by using a few feeding behaviors within a subset of microhabitats whereas others employ a range feeding behaviors across many microhabitats Foraging behavior also varied between pools and across seasons This spatial and temporal variation in foraging behavior and resource use may serve to maintain this polymorphism as the relative fitness of the each morph may vary over space and timeWe thank S Skúlason and B Kristjánsson for suggesting several of the analyses used here F García de León helped us obtain permits required to carry out our research Secretaría de Agricultura Ganadería Desarrollo Rural Pesca y Alimentación Comisión Nacional de Acuacultura y Pesca Dirección General de Ordenamiento Pesquero y Acuícola 18020261303050 and amendments 04109921303 and 14010261303 K Cummins H Kloeppel C Williamson M Hess and A Cohen assisted with our field studies E Dinger and H Kloppel provided invertebrate abundance data and WL Montgomery provided equipment D Bolnick provided the program that determined levels of individual specialization and assisted with its use L FerryGraham and L Drickamer provided helpful comments on early drafts of the manuscript A NAU intramural grant and NSF IBN 0002301 to ACG EPA Star Fellowship U91591901 to BOS and an Ecosystem Research Program grant from The Nature Conservancy to JCM and DAH and NSF EB 0074876 POWRE to JCM supported this work
Keywords:
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