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Dominant convict cichlids (Amatitlania nigrofasciata) grow faster than subordinates when fed an equal ration

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Dominant convict cichlids (Amatitlania nigrofasciata) grow faster than subordinates when fed an equal ration

Lee, Gavin and Grant, James W.A. and Comolli, Perry (2011) Dominant convict cichlids (Amatitlania nigrofasciata) grow faster than subordinates when fed an equal ration. Behaviour, 148 (8). pp. 877-887. ISSN 00057959

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Official URL: http://dx.doi.org/10.1163/000579511X581747

Abstract

Previous studies indicate that dominant fish grow faster than subordinate fish when fed equal rations. It is unclear, however, whether this growth differential is caused by intrinsic differences related to their propensity to become dominant, or by the extrinsic effect of the social stress experienced by subordinates. We first tested whether dominant convict cichlids (Amatitlania nigrofasciata) grew faster than subordinates when fed an equal amount of food. Second, we tested whether the growth advantage of dominants occurred when only visual interactions were allowed between pairs of fish. Third, we randomly assigned social status to the fish to rule out the possibility that intrinsic differences between fish were responsible for both the establishment of dominance and the growth differences. In three separate experiments, dominant fish grew faster than size-matched subordinate convict cichlids, but the growth advantage of dominants was higher when there were direct interactions between fish compared to only visual interactions. Our results provide strong support for the hypothesis that the slower growth rate of subordinate fish was due to the physiological costs of stress.

Divisions:Concordia University > Faculty of Arts and Science > Biology
Item Type:Article
Refereed:Yes
Authors:Lee, Gavin and Grant, James W.A. and Comolli, Perry
Journal or Publication:Behaviour
Date:2011
Keywords:SOCIAL STATUS; GROWTH RATE; STRESS; CONVICT CICHLIDS; AMATITLANIA NIGROFASCIATA;
ID Code:36033
Deposited By:DANIELLE DENNIE
Deposited On:20 Oct 2011 15:55
Last Modified:20 Oct 2011 15:55
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