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- W2005878598 abstract "Abstract Small juveniles of Pomacentrus wardi Whitley and P. flavicauda Whitley were transplanted onto replicate reefs, at various densities, to assess the importance of intraspecific and interspecific competition among fishes of the same size, age, and experience. Although P. flavicauda disappeared from the reefs faster than did P. wardi , survival of neither species was affected by the density of conspecifics or the presence of its congener (during a 1-yr period). Thus densities at the end of the experiment reflected the initial stocking densities which simulated a range of recruitment densities exceeding those observed in wild populations. Crowding caused both species to change their intraspecific behaviours from territorialism to participation in dominance hierarchies. For P. wardi , this was correlated with unequal growth among the individuals on each patch, which partially disguised a trend for the average size of all fish to decrease with increasing density. Over the range of crowding and the time scales explored, total biomass ( = production) did not reach an asymptotic value which might have indicated an absolute shortage of food for these small fishes. Variations in the survival and biomass of P. wardi among replicate reefs were not correlated with the distribution and abundance of any other species also resident on these reefs. The highest densities of damselfishes used in this experiment were more than 50 times the average year-class strength observed at this site. Yet proportional losses from the experimental and natural cohorts were not distinguishable. The lack of compensatory mortality over this range of densities suggests that competition within a year-class does not control the density of young fish in wild populations. This result is consistent with other evidence that recruit densities are extrinsically controlled by a limiting supply of pelagic larvae." @default.
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- W2005878598 date "1982-12-01" @default.
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- W2005878598 title "Some effects of density on the juveniles of two species of tropical, territorial damselfish" @default.
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- W2005878598 doi "https://doi.org/10.1016/0022-0981(82)90057-0" @default.
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