Diet segregation between two sympatric ‘small’Barbus spp: an experimental study of mechanisms
Identifieur interne : 001214 ( Istex/Corpus ); précédent : 001213; suivant : 001215Diet segregation between two sympatric ‘small’Barbus spp: an experimental study of mechanisms
Auteurs : E. Dejen ; F. A. SibbingSource :
- Journal of Fish Biology [ 0022-1112 ] ; 2003-12.
Abstract
Gut contents of two co‐occurring species of ‘small’ diploid barbs (<10 LF cm) in Lake Tana revealed that zooplankton is the major diet component for B. tanapelagius(75% based on volume), but less prominent in B. humilis(40%). Functional response experiments in the laboratory were conducted to elucidate the mechanisms causing this difference. The type of functional response by the two ‘small’ barbs under different microcrustacean zooplankton densities (10, 20, 40, 60 and 80 ind.l−1) was examined. The functional response of B. tanapelagius to increasing prey densities corroborates with Holling Type II model, whereas B. humilis exhibits a Type III functional response. Predation rate is higher for B. tanapelagius at low zooplankton density (<40 ind.l−1) and equals the level of B. humilis at higher densities (>40 ind.l−1). This suggests that at lower zooplankton densities B. humilis is a less efficient forager on zooplankton prey items than B. tanapelagius. In Lake Tana average zooplankton density is relatively low (<35 ind.l−1). Under these food conditions, B. humilis is forced to feed on other food items (e.g. benthic invertebrates), whereas B. tanapelagius primarily feeds on zooplankton. The feeding potentials of the two ‘small’ barbs, as deduced from their morphology explain their different performances and their segregation in space and food resources.
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DOI: 10.1111/j.1095-8649.2003.0216i.x
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<front><div type="abstract" xml:lang="en">Gut contents of two co‐occurring species of ‘small’ diploid barbs (<10 LF cm) in Lake Tana revealed that zooplankton is the major diet component for B. tanapelagius(75% based on volume), but less prominent in B. humilis(40%). Functional response experiments in the laboratory were conducted to elucidate the mechanisms causing this difference. The type of functional response by the two ‘small’ barbs under different microcrustacean zooplankton densities (10, 20, 40, 60 and 80 ind.l−1) was examined. The functional response of B. tanapelagius to increasing prey densities corroborates with Holling Type II model, whereas B. humilis exhibits a Type III functional response. Predation rate is higher for B. tanapelagius at low zooplankton density (<40 ind.l−1) and equals the level of B. humilis at higher densities (>40 ind.l−1). This suggests that at lower zooplankton densities B. humilis is a less efficient forager on zooplankton prey items than B. tanapelagius. In Lake Tana average zooplankton density is relatively low (<35 ind.l−1). Under these food conditions, B. humilis is forced to feed on other food items (e.g. benthic invertebrates), whereas B. tanapelagius primarily feeds on zooplankton. The feeding potentials of the two ‘small’ barbs, as deduced from their morphology explain their different performances and their segregation in space and food resources.</div>
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<abstract lang="en">Gut contents of two co‐occurring species of ‘small’ diploid barbs (<10 LF cm) in Lake Tana revealed that zooplankton is the major diet component for B. tanapelagius(75% based on volume), but less prominent in B. humilis(40%). Functional response experiments in the laboratory were conducted to elucidate the mechanisms causing this difference. The type of functional response by the two ‘small’ barbs under different microcrustacean zooplankton densities (10, 20, 40, 60 and 80 ind.l−1) was examined. The functional response of B. tanapelagius to increasing prey densities corroborates with Holling Type II model, whereas B. humilis exhibits a Type III functional response. Predation rate is higher for B. tanapelagius at low zooplankton density (<40 ind.l−1) and equals the level of B. humilis at higher densities (>40 ind.l−1). This suggests that at lower zooplankton densities B. humilis is a less efficient forager on zooplankton prey items than B. tanapelagius. In Lake Tana average zooplankton density is relatively low (<35 ind.l−1). Under these food conditions, B. humilis is forced to feed on other food items (e.g. benthic invertebrates), whereas B. tanapelagius primarily feeds on zooplankton. The feeding potentials of the two ‘small’ barbs, as deduced from their morphology explain their different performances and their segregation in space and food resources.</abstract>
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