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Registros recuperados: 4
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Trophic interactions in the coastal ecosystem of Sri Lanka: An ECOPATH preliminary approach ArchiMer
Haputhantri, S; Villanueva, Ching-maria; Moreau, J.
This study attempts to assemble and summarize existing information in order to build a general representation of the trophic interactions within the shallow coastal ecosystem of Sri Lanka. A multispecific ecosystem-based approach on trophic relationships and their possible variations was performed using ECOPATH. Thirty-nine functional groups were considered representing all trophic levels in the food web. Time-dynamic simulation was carried out using the ECOSIM routine to evaluate the impact of the 1998 El Nino event on key functional groups. Results show that the time needed for any impacted functional group to recover to its initial abundance increased with the trophic level. Two time-series data sets derived from commercial catch and effort statistics...
Tipo: Text Palavras-chave: Sri Lanka; Indian Ocean; Fisheries management; Feeding relationships; Trophic level; ECOSIM; ECOPATH; Trophic modelling.
Ano: 2008 URL: http://archimer.ifremer.fr/doc/2008/publication-3892.pdf
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Modeling trophic interactions in Lake Kivu: What roles do exotics play? ArchiMer
Villanueva, Ching-maria; Isumbisho, M; Kaningini, B; Moreau, J; Micha, J.
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...
Tipo: Text Palavras-chave: Lake Kivu; Exotic fishes; Invasion; Transfer efficiency; Food web structure.
Ano: 2008 URL: http://archimer.ifremer.fr/doc/2008/publication-4722.pdf
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Comparative analysis of trophic structure and interactions of two tropical lagoons ArchiMer
Villanueva, Ching-maria; Laleye, P; Albaret, J; Lae, Raymond; Tito De Morais, Luis; Moreau, J.
A comparative study of the Ebrie lagoon (Ivory Coast) and Lake Nokoue (Benin) was made based on ecotrophic model outputs that describe each system's structure and functioning. Two models were constructed using the Ecopath software to differentiate main biomass flows in the systems. Results indicate that biomasses and productions in both ecosystems are concentrated in trophic levels (TL) 2 and 3. Higher TL biomasses and productions in Lake Nokoue compared to Ebrie lagoon may be explained by the presence of acadjas. High production per biomass (P/B) and food consumption per biomass (Q/B) values indicate the high productivity of these systems and the abundance of juveniles in most groups which utilize these systems as refuge zones and nurseries. The...
Tipo: Text Palavras-chave: Ecopath; System maturity; Transfer efficiency; West Africa; Tropical lagoons.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/publication-2009.pdf
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Evolution en fréquence et en intensité de l'infestation des moules par Mytilicola intestinalis steuer dans le bassin de Marrenes-Oléron pour la période 1960-63 ArchiMer
Moreau, J; Trochon, P.
Malgré les recherches fréquentes effectuées dans les moules de bouchots du bassin de Marennes-Oléron, Mytilicola intestinalis STEUER ne fut décelé pour la première fois qu'en octobre 1960, à la fois sur la côte continentale et sur celle de l'île d'Oléron, mais à peine un an après le début de l'envahissement de la baie de l'Aiguillon (BRIENNE, 1960-1962, Science et Pêche n° 87 et 106). L'extension de Mytilicola atteignant notre région, nous avons porté un intérêt accru à ce parasite et, dès cette époque, de nombreux prélèvements furent effectués pour préciser son mode de propagation, en même temps que des conseils étaient donnés aux professionnels. Sur la côte continentale, les recherches ont été faites dans les bouchots situés au nord de l'île Madame,...
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Ano: 1964 URL: http://archimer.ifremer.fr/doc/1964/publication-7226.pdf
Registros recuperados: 4
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