Recovery of cichlid species in Lake Victoria: an examination of factors leading to differential extinction

Recovery of cichlid species in Lake Victoria: an examination of factors leading to differential... −1 the Mwanza Gulf were no longer monitored sys- had decreased from ca. 1100 to 200 kg h .In the tematically. However, through local fishermen and sample taken in 1997, the contribution of Nile perch fishery researchers we heard that the amounts of hap- had decreased to 76%, while that of haplochromines lochromines in the catches increased. Examination had increased to 21%, however, the total catch rate −1 of several catches in 1997 and 1999 indeed revealed (199 kg h ) remained low. a substantial upheaval of two zooplanktivorous spe- In 1978, about 60% of the demersal haplochromine cies in the sublittoral areas, whereas other species biomass consisted of detritivores/phytoplanktivores remained rare or absent. Processes involved in extinc- (more than 10 species, dominated by H. (Entero- tion are rarely well documented because ecological chromis) “nigrofasciatus”, H. (E.) cinctus, H. (E.) data of species in a community prior to and during the “75” and H. (E.) “dusky wine red fin”) and 30% of disturbance that causes extinction are often lacking. zooplanktivores (12 species, mainly H. (Y.) heusink- In particular for tropical ecosystems, the fish fauna veldi, H. (Y.) pyrrhocephalus, H. (?) piceatus and H. of Lake Victoria offers one of Reviews in Fish Biology and Fisheries Springer Journals

Recovery of cichlid species in Lake Victoria: an examination of factors leading to differential extinction

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Kluwer Academic Publishers
Copyright © 2000 by Kluwer Academic Publishers
Life Sciences; Freshwater & Marine Ecology; Zoology
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