Fishpond colonization by aquatic macroinvertebrates: case of Blondey (Côte d’Ivoire; West Africa)
Nangounon Soro, Idrissa Adama Camara, Edia Oi Edia, Dramane Diomande
The diversity of aquatic macroinvertebrates and their colonization were studied in a fishpond of blondey at two growth stages of fish breeding, juvenil stage and adult stage. Samples were taken monthly with artificial substrates during three months for juvenil stage and six months for adult stage. A total of 32 taxa were recorded. Insecta was the most dominant class on both juvenil stage and adult stage in number of taxa and abundance, followed by Gasteropoda and Acheta. The taxa composition and the diversity of aquatic macroinvertebrates were progressively increased in juvenil stage. Conversely these two parameters observed a heterogeneous dynamic in adult stage. According to the functional feeding groups, the pioneer colonists were mainly Omnivores (e.g. Setodes sp.) during the juvenil stage. This group was followed by the Grazers and Predators at the same period. And then, during the adult stage, Detritivores (e.g. Chironomids) appeared and dominated the aquatic invertebrates always with the presence of Grazers and Predators while the Omnivores decreased and disappeared at the end of this stage. This way, the Omnivores are the principal colonists of fishpond during juvenil stage and then the Detritivores appear and dominate the macroinvertebrate’s functional feeding groups while the adult stage.