caa a22 4500 606228020 CHVBK 20210128101201.0 cr unu---uuuuu 210128e20150501xx s 000 0 eng 10.1007/s10641-014-0356-2 doi (NATIONALLICENCE)springer-10.1007/s10641-014-0356-2 Can differential resurgence of haplochromine trophic groups in Lake Victoria be explained by selective Nile perch, Lates niloticus (L.) predation? [Elektronische Daten] [Mary Kishe-Machumu, Tanja Voogd, Jan Wanink, Frans Witte] The introduced Nile perch, Lates niloticus Linnaeus 1758 in Lake Victoria is considered to be a major contributor to the decline of haplochromine species. In the 1990s, the abundance of Nile perch declined and the recovery of some haplochromine species, mainly detritivores and zooplanktivores was observed. However, the resurgence of detritivores group was much slower than that of zooplanktivores. Differential Nile perch predation is thought to be the main cause for the differential recovery of these two groups. To test this, the frequency of occurrence (FOO) of the detritivores and zooplanktivores in the stomachs of the Nile perch and their FOO in the lake were compared. On their vulnerability to predation, body shape of the two groups was measured and compared with Nile perch mouth gape. The FOO for haplochromines in Nile perch stomach contents were 13.7 % detritivores and 86.3% zooplanktivores, whereas in trawl catches they were 24.3 and 75.7% respectively. The FOO of detritivores in the Nile perch diet was significantly lower than in the environment. The same holds for the FOO of juvenile haplochromines (13% in the diet and 45% in the environment). Body depth of detritivores (0.8-1.9cm) in the diet of Nile perches was significantly larger than that of the zooplanktivores (0.6-1.7cm). However, based on Nile perch mouth gape (2.0-5.3cm), only Nile perches <13cm TL (<1.9m mouth gape) would not be able to swallow the largest detritivores. Thus, selective predation by Nile perch cannot explain the relatively slow resurgence of detritivores. Springer Science+Business Media Dordrecht, 2014 Nile perch nationallicence Detritivores nationallicence Zooplanktivores nationallicence Predation nationallicence Prey selectivity nationallicence Lake Victoria nationallicence Kishe-Machumu Mary Division of Research, Training and Extension, Tanzania Fisheries Research Institute, P.O. Box 9750, Dar es Salaam, Tanzania aut Voogd Tanja Institute of Biology Leiden, Leiden University, P.O. Box 9505, 2300 RA, Leiden, The Netherlands aut Wanink Jan Institute of Biology Leiden, Leiden University, P.O. Box 9505, 2300 RA, Leiden, The Netherlands aut Witte Frans Institute of Biology Leiden, Leiden University, P.O. Box 9505, 2300 RA, Leiden, The Netherlands aut Environmental Biology of Fishes Springer Netherlands 98/5(2015-05-01), 1255-1263 0378-1909 98:5<1255 2015 98 10641 https://doi.org/10.1007/s10641-014-0356-2 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s10641-014-0356-2 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Kishe-Machumu Mary Division of Research, Training and Extension, Tanzania Fisheries Research Institute, P.O. Box 9750, Dar es Salaam, Tanzania aut NATIONALLICENCE 700 1- Voogd Tanja Institute of Biology Leiden, Leiden University, P.O. Box 9505, 2300 RA, Leiden, The Netherlands aut NATIONALLICENCE 700 1- Wanink Jan Institute of Biology Leiden, Leiden University, P.O. Box 9505, 2300 RA, Leiden, The Netherlands aut NATIONALLICENCE 700 1- Witte Frans Institute of Biology Leiden, Leiden University, P.O. Box 9505, 2300 RA, Leiden, The Netherlands aut NATIONALLICENCE 773 0- Environmental Biology of Fishes Springer Netherlands 98/5(2015-05-01), 1255-1263 0378-1909 98:5<1255 2015 98 10641