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The role of ecological strategies in the colonization success of pelagic fish in a large tropical reservoir (Petit-Saut Reservoir, FrenchGuiana)

Published online by Cambridge University Press:  06 February 2012

Bernard de Mérona  and
Régis Vigouroux
Bernard de Mérona*
Affiliation:
UMR Borea, centre IRD de Cayenne, rte de Montabo km 0.275, BP 165, 97323-Cayenne Cedex, France, French Guiana
Régis Vigouroux
Affiliation:
Laboratoire Hydreco, BP 823, 97388 Kourou Cedex, France, French Guiana
*
a Corresponding author: bernard.de.merona@ird.fr
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Abstract

Although many studies have been made on fish community changes in reservoirs, the diversity of situations means that general models are still difficult to construct. In order to be useful to managers, the information gathered in these studies must cover the regional taxonomic peculiarities. The inclusion of ecological strategies allows the detection of general patterns of fish community change. In the present study, multivariate analyses and non-parametric tests were used in order to detect relationships between ecological traits of 39 fish species and pelagic fish assemblages. We used gillnet captures of fish made in the Sinnamary River before filling of the Petit-Saut Reservoir and in the reservoir 8 years after closure of the dam and published data on fish species diet, life history parameters and morphology. Significant relationships were detected between fish assemblages and every ecological trait, which would have allowed the forecast of the type of species able to colonize the Petit-Saut Reservoir. Provided that the general characteristics of a river before damming are taken into account, it seems that feeding strategies can be used to predict future fish population and species changes on a general basis. Conversely, the lack of published data prevents definitive conclusions from being drawn concerning life-history and swimming strategies.

Keywords

Freshwater fishBiodiversity conservationLife historyDietEcomorphologySouth America
Type
Research Article
Information
Aquatic Living Resources , Volume 25 , Issue 1 , January 2012 , pp. 41 - 54
Copyright
© EDP Sciences, IFREMER, IRD 2012

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