Modeling trophic interactions in Lake Kivu: What roles do exotics play?

Maria Concepcion S Villanueva, Mwapu Isumbisho, Boniface Kaningini, Jacques Moreau, Jean-Claude Micha

Résultats de recherche: Contribution à un journal/une revueArticle

Résumé

An Ecopath model of the southern part of Lake Kivu, a deep African equatorial lake was constructed to quantitatively describe the possible impact of fish introductions in this ecosystem. This study is considered as an initial step in summarizing ecological and biological information, under a coherent framework, on this ecosystem. Fourteen compartments were considered. As a phytoplankton-based food web, it is observed that key food sources are not fully utilized as transfer efficiencies per trophic levels (TL) varies between 4.5 and 9.4%. Zooplankton plays a major role in transferring organic matter from TL1 to higher TLs due to the abundance of zooplanktivores. Shifts in food preferences and distribution of some of the fish functional groups were observed as a response to competition. The majority of fish biomass concentration is in TL3 (55%). The fishery is concentrated at TL3 and can, therefore, be consider as "immature", sensu Odum. The direct and indirect effects of predation between system components (i.e. fish, invertebrates, phytoplankton and detritus) are quantitatively described and the possible influence and role in the ecosystem's functioning of introduced fish species are discussed.

langue originaleAnglais
Pages (de - à)422-438
Nombre de pages17
journalEcological Modelling
Volume212
Numéro de publication3-4
Les DOIs
étatPublié - 10 avr. 2008

Empreinte digitale

trophic interaction
lakes
lake
fish
modeling
ecosystems
ecosystem
phytoplankton
food preference
food choices
trophic level
detritus
functional group
food webs
food web
zooplankton
predation
invertebrate
invertebrates
immatures

Citer ceci

Villanueva, Maria Concepcion S ; Isumbisho, Mwapu ; Kaningini, Boniface ; Moreau, Jacques ; Micha, Jean-Claude. / Modeling trophic interactions in Lake Kivu: What roles do exotics play?. Dans: Ecological Modelling . 2008 ; Vol 212, Numéro 3-4. p. 422-438.
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abstract = "An Ecopath model of the southern part of Lake Kivu, a deep African equatorial lake was constructed to quantitatively describe the possible impact of fish introductions in this ecosystem. This study is considered as an initial step in summarizing ecological and biological information, under a coherent framework, on this ecosystem. Fourteen compartments were considered. As a phytoplankton-based food web, it is observed that key food sources are not fully utilized as transfer efficiencies per trophic levels (TL) varies between 4.5 and 9.4{\%}. Zooplankton plays a major role in transferring organic matter from TL1 to higher TLs due to the abundance of zooplanktivores. Shifts in food preferences and distribution of some of the fish functional groups were observed as a response to competition. The majority of fish biomass concentration is in TL3 (55{\%}). The fishery is concentrated at TL3 and can, therefore, be consider as {"}immature{"}, sensu Odum. The direct and indirect effects of predation between system components (i.e. fish, invertebrates, phytoplankton and detritus) are quantitatively described and the possible influence and role in the ecosystem's functioning of introduced fish species are discussed.",
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Villanueva, MCS, Isumbisho, M, Kaningini, B, Moreau, J & Micha, J-C 2008, 'Modeling trophic interactions in Lake Kivu: What roles do exotics play?', Ecological Modelling , VOL. 212, Numéro 3-4, p. 422-438. https://doi.org/10.1016/j.ecolmodel.2007.10.047

Modeling trophic interactions in Lake Kivu: What roles do exotics play? / Villanueva, Maria Concepcion S; Isumbisho, Mwapu; Kaningini, Boniface; Moreau, Jacques; Micha, Jean-Claude.

Dans: Ecological Modelling , Vol 212, Numéro 3-4, 10.04.2008, p. 422-438.

Résultats de recherche: Contribution à un journal/une revueArticle

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AU - Villanueva, Maria Concepcion S

AU - Isumbisho, Mwapu

AU - Kaningini, Boniface

AU - Moreau, Jacques

AU - Micha, Jean-Claude

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N2 - An Ecopath model of the southern part of Lake Kivu, a deep African equatorial lake was constructed to quantitatively describe the possible impact of fish introductions in this ecosystem. This study is considered as an initial step in summarizing ecological and biological information, under a coherent framework, on this ecosystem. Fourteen compartments were considered. As a phytoplankton-based food web, it is observed that key food sources are not fully utilized as transfer efficiencies per trophic levels (TL) varies between 4.5 and 9.4%. Zooplankton plays a major role in transferring organic matter from TL1 to higher TLs due to the abundance of zooplanktivores. Shifts in food preferences and distribution of some of the fish functional groups were observed as a response to competition. The majority of fish biomass concentration is in TL3 (55%). The fishery is concentrated at TL3 and can, therefore, be consider as "immature", sensu Odum. The direct and indirect effects of predation between system components (i.e. fish, invertebrates, phytoplankton and detritus) are quantitatively described and the possible influence and role in the ecosystem's functioning of introduced fish species are discussed.

AB - An Ecopath model of the southern part of Lake Kivu, a deep African equatorial lake was constructed to quantitatively describe the possible impact of fish introductions in this ecosystem. This study is considered as an initial step in summarizing ecological and biological information, under a coherent framework, on this ecosystem. Fourteen compartments were considered. As a phytoplankton-based food web, it is observed that key food sources are not fully utilized as transfer efficiencies per trophic levels (TL) varies between 4.5 and 9.4%. Zooplankton plays a major role in transferring organic matter from TL1 to higher TLs due to the abundance of zooplanktivores. Shifts in food preferences and distribution of some of the fish functional groups were observed as a response to competition. The majority of fish biomass concentration is in TL3 (55%). The fishery is concentrated at TL3 and can, therefore, be consider as "immature", sensu Odum. The direct and indirect effects of predation between system components (i.e. fish, invertebrates, phytoplankton and detritus) are quantitatively described and the possible influence and role in the ecosystem's functioning of introduced fish species are discussed.

KW - Exotic fishes

KW - Food web structure

KW - Invasion

KW - Lake Kivu

KW - Transfer efficiency

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