Opheliidae (Polychaeta) from the Southwestern Atlantic ocean, with the description of Travisia amadoi n. sp., Ophelina gaucha n. sp. and Ophelina alata n. sp. |
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Authors: | Rodolfo Elías Claudia Silvia Bremec Paulo da Cunha Lana José María Orensanz |
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Affiliation: | (1) Ichthyological Laboratory, Royal Museum of Central Africa, B-3080 Tervuren, Belgium;(2) Laboratory of Comparative Anatomy and Biodiversity, Katholieke Universiteit Leuven, Ch. De Bériotstraat 32, B-3000 Leuven, Belgium;(3) Present address: UFR Biosciences, Laboratoire d'Hydrobiologie 22, Université de Cocody Abidjan, BP 582 Abidjan 22, Côte d'Ivoire |
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Abstract: | The diet of the brackish water tilapia Sarotherodon melanotheron is studied in various riverine and lacustrine systems of the Bia River basin (Côte d'Ivoire). Comparison of the diet between sampling sites (upper course, lower course and man-made Lake Ayame) shows significant differences. In the man-made lake, prey described as preferential include Asterionella (Bacillariophyceae) and Bosmina(Cladocera). In the lower course, the preferential preys are represented by Lyngbya(Cyanophyceae) while in the upper course Lyngbya and chironomid larvae are preferential. These differences are related to the altered environmental conditions generated by the construction of the dam on the Bia river main stream. In the man-made lake, there is no shift in diet either with the seasons (dry and rainy seasons) or with size. |
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Keywords: | Sarotherodon melanotheron diet river man-made lake Cô te d'Ivoire Africa |
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