Article (Scientific journals)
Diet overlap between the newly introduced Lamprichthys tanganicanus and the Tanganyika sardine in Lake Kivu, Eastern Africa
Masilya, M. P.; Darchambeau, François; Isumbisho, M. et al.
2011In Hydrobiologia, 675 (1), p. 75-86
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Keywords :
Exotic species; Fisheries; Large African lake; Resource competition; East African Lakes; Lake Kivu; Hexapoda; Lamprichthys tanganicanus; Limnothrissa miodon; Pisces
Abstract :
[en] This study evaluates the possible competition for food between Lamprichthys tanganicanus, recently introduced in Lake Kivu, and Limnothrissa miodon, which has been the basis of the pelagic fishery in this lake for several decades. Since 2006, L. tanganicanus has expanded in the lake and its numbers have increased in the captures, raising concern for the sardine fishery. We carried out a 2-year monthly survey, based on experimental captures in littoral and pelagic stations, which demonstrated the invasive dispersal of L. tanganicanus in littoral and pelagic waters. The diet of both species was determined on the basis of gut content analyses, taking into account the influence of site and season, and a diet overlap index was calculated. In the pelagic zone, where almost all size classes of both species were present and essentially fed upon mesozooplankton, the diet overlap was high. This situation stems from the fact that L. tanganicanus has colonized the pelagic zone in Lake Kivu, likely in search for more abundant mesozooplankton. Inshore, the diet overlap between the two species was lower, as L. tanganicanus consumed a broad range of food, whereas L. miodon strongly selected insects and, chiefly for the largest specimens, fishes. These results suggest a likelihood of interspecific competition, particularly offshore, where mesozooplankton is the main available food type, and call for further monitoring of the sardine fishery, to assess a possible impact of the invader. © 2011 Springer Science+Business Media B.V.
Disciplines :
Environmental sciences & ecology
Author, co-author :
Masilya, M. P.;  Laboratory of Freshwater Ecology, URBE, Department of Biology, University of Namur, 5000 Namur, Belgium, United'Enseignement et de Recherche en Hydrobiologie Appliquee (UERHA), ISP/Bukavu, B.P. 854, Bukavu, Congo
Darchambeau, François ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Unité d'Océanographie chimique (UOC)
Isumbisho, M.;  United'Enseignement et de Recherche en Hydrobiologie Appliquee (UERHA), ISP/Bukavu, B.P. 854, Bukavu, Congo
Descy, Jean-Pierre ;  Laboratory of Freshwater Ecology, URBE, Department of Biology, University of Namur, 5000 Namur, Belgium
Language :
English
Title :
Diet overlap between the newly introduced Lamprichthys tanganicanus and the Tanganyika sardine in Lake Kivu, Eastern Africa
Publication date :
2011
Journal title :
Hydrobiologia
ISSN :
0018-8158
eISSN :
1573-5117
Publisher :
Springer Science & Business Media B.V.
Volume :
675
Issue :
1
Pages :
75-86
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 16 January 2013

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