Zooplankton of Lake Kivu, East Africa, half a century after the Tanganyika sardine introduction

M. Isumbisho, B. Kaningini, H. Sarmento, J.-C. Micha, J.-P. Descy

Résultats de recherche: Contribution à un journal/une revueArticle

Résumé

The introduction into Lake Kivu of the planktivorous fish Limnothrissa miodon at the end of the 1950s raised major concern about the fate of mesozooplankton, but few data were available to assess the impact of predation. In this study, we followed zooplankton variations in Lake Kivu for 3.5 years. Present Lake Kivu mesozooplankton is dominated by cyclopoid copepods (Thermocyclops consimilis, Mesocyclops aequatorialis and Tropocyclops confinis), but cladocerans and rotifers are also present. Each year, total crustacean abundance in the plankton increased to a distinct seasonal maximum following a rise of phytoplankton production associated with a deep epilimnetic mixing in the dry season (August-September). This dependence on phytoplankton resource suggests that mesozooplankton dynamics in Lake Kivu is mainly bottom-up controlled, contrary to expectations from the food web structure. However, measurements of body size indicate that sardine predation affects the cladoceran Diaphanosoma excisum, whereas the larger copepods may efficiently escape predation by migration in the deep mixolimnion at daytime. Total biomass of mesozooplankton in Lake Kivu is lower than in lakes Tanganyika and Malawi. This may be related to the disappearance of a large grazer that existed before the sardine introduction, whereas the large lakes of the same region have a more complex pelagic food web, with piscivorous fish, and with calanoid copepods, which can more efficiently exploit phytoplankton production.
langue originaleAnglais
Pages (de - à)971-989
Nombre de pages19
journalJournal of Plankton Research
Volume28
Numéro de publication11
Les DOIs
étatPublié - 1 nov. 2006

Empreinte digitale

sardines
Eastern Africa
zooplankton
lakes
lake
Copepoda
phytoplankton
predation
food webs
food web
Mesocyclops
Lake Malawi
Lake Tanganyika
fish
Rotifera
plankton
East Africa
dry season
body size
Crustacea

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title = "Zooplankton of Lake Kivu, East Africa, half a century after the Tanganyika sardine introduction",
abstract = "The introduction into Lake Kivu of the planktivorous fish Limnothrissa miodon at the end of the 1950s raised major concern about the fate of mesozooplankton, but few data were available to assess the impact of predation. In this study, we followed zooplankton variations in Lake Kivu for 3.5 years. Present Lake Kivu mesozooplankton is dominated by cyclopoid copepods (Thermocyclops consimilis, Mesocyclops aequatorialis and Tropocyclops confinis), but cladocerans and rotifers are also present. Each year, total crustacean abundance in the plankton increased to a distinct seasonal maximum following a rise of phytoplankton production associated with a deep epilimnetic mixing in the dry season (August-September). This dependence on phytoplankton resource suggests that mesozooplankton dynamics in Lake Kivu is mainly bottom-up controlled, contrary to expectations from the food web structure. However, measurements of body size indicate that sardine predation affects the cladoceran Diaphanosoma excisum, whereas the larger copepods may efficiently escape predation by migration in the deep mixolimnion at daytime. Total biomass of mesozooplankton in Lake Kivu is lower than in lakes Tanganyika and Malawi. This may be related to the disappearance of a large grazer that existed before the sardine introduction, whereas the large lakes of the same region have a more complex pelagic food web, with piscivorous fish, and with calanoid copepods, which can more efficiently exploit phytoplankton production.",
author = "M. Isumbisho and B. Kaningini and H. Sarmento and J.-C. Micha and J.-P. Descy",
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Zooplankton of Lake Kivu, East Africa, half a century after the Tanganyika sardine introduction. / Isumbisho, M.; Kaningini, B.; Sarmento, H.; Micha, J.-C.; Descy, J.-P.

Dans: Journal of Plankton Research, Vol 28, Numéro 11, 01.11.2006, p. 971-989.

Résultats de recherche: Contribution à un journal/une revueArticle

TY - JOUR

T1 - Zooplankton of Lake Kivu, East Africa, half a century after the Tanganyika sardine introduction

AU - Isumbisho, M.

AU - Kaningini, B.

AU - Sarmento, H.

AU - Micha, J.-C.

AU - Descy, J.-P.

N1 - Copyright 2008 Elsevier B.V., All rights reserved.

PY - 2006/11/1

Y1 - 2006/11/1

N2 - The introduction into Lake Kivu of the planktivorous fish Limnothrissa miodon at the end of the 1950s raised major concern about the fate of mesozooplankton, but few data were available to assess the impact of predation. In this study, we followed zooplankton variations in Lake Kivu for 3.5 years. Present Lake Kivu mesozooplankton is dominated by cyclopoid copepods (Thermocyclops consimilis, Mesocyclops aequatorialis and Tropocyclops confinis), but cladocerans and rotifers are also present. Each year, total crustacean abundance in the plankton increased to a distinct seasonal maximum following a rise of phytoplankton production associated with a deep epilimnetic mixing in the dry season (August-September). This dependence on phytoplankton resource suggests that mesozooplankton dynamics in Lake Kivu is mainly bottom-up controlled, contrary to expectations from the food web structure. However, measurements of body size indicate that sardine predation affects the cladoceran Diaphanosoma excisum, whereas the larger copepods may efficiently escape predation by migration in the deep mixolimnion at daytime. Total biomass of mesozooplankton in Lake Kivu is lower than in lakes Tanganyika and Malawi. This may be related to the disappearance of a large grazer that existed before the sardine introduction, whereas the large lakes of the same region have a more complex pelagic food web, with piscivorous fish, and with calanoid copepods, which can more efficiently exploit phytoplankton production.

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DO - 10.1093/plankt/fbl032

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