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Comptes Rendus Biologies
Volume 336, n° 7
pages 342-353 (juillet 2013)
Doi : 10.1016/j.crvi.2013.05.004
Received : 19 January 2013 ;  accepted : 29 May 2013
The impact of environmental degradation on reproduction of the black-chinned tilapia Sarotherodon melanotheron from various coastal marine, estuarine and freshwater habitats

Moussa Guèye a, Justin Kantoussan b, Mbaye Tine c,
a IRD, route des hydrocarbures, BP 1386, 18524 Dakar, Senegal 
b Université Gaston Berger, route de Ngallèle, BP 234, Saint-Louis, Senegal 
c Genome Centre Cologne at MPI for Plant Breeding Research, Carl-von-Linné-Weg 10, 50829 Cologne, Germany 

Corresponding author.

There is growing evidence that climate change has greatly altered environmental conditions in many aquatic ecosystems over the last decades, leading to changes in fish distribution and life history traits. Recent works conducted in Senegalese and Gambian coastal marine, estuarine and freshwater ecosystems have shown important changes in the intensity, frequency and breeding timing of wild population of Sarotherodon melanotheron in response to changes in salinity regimes. In addition to salinity, this study investigates the potential influences of other environmental factors that have received less attention on the reproduction of S. melanotheron from three different aquatic ecosystems in Senegal. The results demonstrate that day-length and temperature affect sexual maturity in both males and females from Guiers Lake and Hann Bay, but no such effects were found in upstream of the Saloum Estuary, where the spawning activity seems to be under the synergetic control of rainfall and salinity that apparently predominate over all the other ambient factors. This study demonstrated for the first time that aside from photoperiod and temperature, rainfall also influences fish reproduction in Hann Bay probably through its effects on water quality. Furthermore, our results confirm previous findings that changes in salinity regimes resulting from seasonal variations in precipitation and evaporation are the ultimate causes of temporal changes in the reproductive activity of the species in this estuary.

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Keywords : Adaptation, Stress, Fish, Photoperiod, Temperature, Rainfall, Salinity

© 2013  Published by Elsevier Masson SAS de la part de Académie des sciences.
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