Comparative mass-balanced trophic models to assess the impact of environmental management measures in a tropical reservoir ecosystem

Panikkar, Preetha; Khan, M. Feroz

doi:10.1016/j.ecolmodel.2007.10.029

Cited by 43 publications

(25 citation statements)

References 32 publications

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“…Detritus has neither a positive nor negative impact on itself in Lake Annecy. This is in accordance with results from other lake ecosystems Moreau et al, 2001;Fetahi and Mengistou, 2007;Panikkar and Khan, 2008). The positive impact of detritus can be seen on all the functional groups, showing the importance of detritus in Lake Annecy's ecosystem as observed in trophic flows.…”

Section: 258supporting

confidence: 80%

“…The positive impact of detritus can be seen on all the functional groups, showing the importance of detritus in Lake Annecy's ecosystem as observed in trophic flows. The same has been observed by Gamito and Erzini (2005) and Panikkar and Khan (2008). Pike has a negative impact on all the fish groups, being the top predator.…”

Section: 258supporting

confidence: 65%

“…Lake Victoria (Moreau,1995), Lake Turkana (Kolding, 1993), Lake George (Moreau et al, 1993), Lake Chad (Palomares et al, 1993a). Lake Awassa (Fetahi and Mengistou, 2007), Lake Kivu (Villanueva et al, 2008) and Lake Ayamé (Traore et al, 2008), and a few Chinese and Indian lakes including Lake Qiandaohu (Liu et al, 2007), Wyra reservoir (Panikkar and Khan, 2008) and Lake Taihu (Li et al, 2009), and for a few temperate lakes including Lake Ontario (Halfon and Schito, 1993) and Lake Aydat in France (Reyes-Marchant et al, 1993). A few studies have been reported on French rivers and coastal areas including Garonne River (Palomares et al, 1993c), Étang de Thau Lagoon (Palomares et al, 1993b), Bay of Biscay (Ainsworth et al, 2001), Seine Estuary (Rybarczyk and Elkaïm, 2003) and Bay of Mont Saint-Michel (Arbach Leloup et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

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Preliminary trophic network analysis of subalpine Lake Annecy (France) using an Ecopath model

Janjua¹,

Gerdeau×²

2009

Knowl. Managt. Aquatic Ecosyst.

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Lake Annecy is the second largest natural lake in France, with intensive commercial and recreational fisheries. However, there is limited knowledge of its trophic interaction. A preliminary Ecopath model was fitted to study the trophic interaction in the lake using the available data on most of the ecosystem compartments. Fourteen functional groups were used in the present analysis. Most of the consumers have ecotrophic efficiency from 0.3 to 0.6. The results show that flow from detritus is as important as flow from primary producers. The overall transfer efficiency of the system is 9.6. The primary production/respiration (P p /R) ratio, which is 3.253, shows that Lake Annecy's ecosystem is comparatively mature. The gross efficiency of fisheries is 0.001173. Catch trophic level and percentage of primary productivity required for catch show that fishery in Lake Annecy is stable. The values of ascendancy (31.2) and overhead (68.8) show the stability of the ecosystem. Mixed trophic analysis indicates that zoobenthos have a positive effect on most of the fish functional groups. This preliminary model can be helpful to pinpoint the gaps in the present knowledge about Lake Annecy. RÉSUMÉAnalyse préliminaire du réseau trophique du lac d'Annecy avec le modèle Ecopath Le lac d'Annecy est le second plus grand lac naturel de France avec une importante pêcherie commerciale et amateur. Toutefois les connaissances sur les interactions trophiques sont limitées. Le modèle Ecopath a été ajusté pour étudier les interactions trophiques dans le lac en utilisant les données disponibles sur la plupart des compartiments de l'écosystème. Quatorze groupes fonctionnels ont été utilisés dans cette analyse. La plupart des consommateurs ont une efficience écologique qui varie de 0,3 à 0,6. Les résultats montrent que le flux de détritus est aussi important que le flux des producteurs primaires. L'efficience globale du système est de 9,6. Le rapport production primaire/respiration (P p /R) de 3,253 montre que le lac d'Annecy est relativement mature. L'efficience brute de la pêcherie est de 0,001173. Le niveau trophique des captures et le pourcentage de la production primaire requis par ces captures montrent que la pêcherie au lac d'Annecy est stable. Les valeurs de l'« ascendancy » (31,2) et de l'« overhead » (68,8) montrent la stabilité du système. L'analyse trophique montre que le zoobenthos a un effet positif sur la plupart des groupes fonctionnels de poissons. Ce modèle préliminaire peut être utile pour mettre le doigt sur les lacunes dans les connaissances actuelles sur le lac d'Annecy.

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Section: 258supporting

confidence: 80%

Section: 258supporting

confidence: 65%

Section: Introductionmentioning

confidence: 99%

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Preliminary trophic network analysis of subalpine Lake Annecy (France) using an Ecopath model

Janjua¹,

Gerdeau×²

2009

Knowl. Managt. Aquatic Ecosyst.

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“…The impounded reservoir is considered an unstable ecosystem subject because of the habitat changes from lotic to lentic conditions (Gubiani et al 2011) and the ecosystem exhibits multiple ecological stressors (Essington 2007;Panikkar & Khan 2008). These stressors include dynamics of fish stocks and community composition, eutrophication, enrichment of zooplankton, decomposition of submerged aquatic vegetation, as well as invasion of species which are susceptible to the operation and impoundment of dams (Heymans et al 2004;Feroz Khan & Panikkar, 2009).…”

Section: Introductionmentioning

confidence: 99%

Application of Ecopath model on trophic interactions and energy flows of impounded Manwan reservoir ecosystem in Lancang River, southwest China

Deng

Liu

et al. 2014

Journal of Freshwater Ecology

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The structure and function of aquatic communities in reservoir ecosystems can be strongly affected by dam construction. The Ecopath model is an effective tool that reveals the food web structure and pathways of energy flows. In this study, it was applied to analyze the trophic interactions and energy flows within the Manwan reservoir ecosystem on Lancang River in southwest China. Ecotrophic efficiency (EE) was calculated and the value of EE was 0.073 for the least-exploited piscivorous fishes (top predators) and 0.93 for the most-exploited zoobenthos. Four estimated trophic levels of the groups varied from 1 for detritus and phytoplankton (level I) to 3.69 for piscivorous fishes (level IV) and the remaining groups were mainly at trophic levels II and III. Food web structures and interactions were well represented by a linear food chain that was dominated by a detritus pathway; that is, energy flows from detritus were as important as phytoplankton in the web. The proportion of total energy flow originating from detritus was 46% while the other 54% came from primary producers. The average transfer efficiencies between trophic levels were 16.6% from primary producer and 15.7% from detritus. Total system throughput was found to be 5550 t km ¡2 yr ¡1 , total primary production/total respiration ratio was 2.46, and the ascendency index was 27.4%. These results showed that Manwan reservoir ecosystem was an immature ecosystem and still at its development stage. These results are helpful for biodiversity preservation and the understanding and monitoring of reservoir ecosystems which are key resources for fish and other aquatic organisms.

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“…It has been used to analyze different aspects of the resulting food web network [14][15][16]. Moreover, mass-balanced models enable comparisons between different ecosystems and between different perio ds of the same ecosystem [17][18][19][20]. Furthermore, it is often used to explore fisheries management policy options [21][22][23].…”

mentioning

confidence: 99%

A trophic model of the Pearl River Delta coastal ecosystem

Duan

Liu

et al. 2009

Ocean & Coastal Management

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Comparative mass-balanced trophic models to assess the impact of environmental management measures in a tropical reservoir ecosystem

Cited by 43 publications

References 32 publications

Preliminary trophic network analysis of subalpine Lake Annecy (France) using an Ecopath model

Preliminary trophic network analysis of subalpine Lake Annecy (France) using an Ecopath model

Application of Ecopath model on trophic interactions and energy flows of impounded Manwan reservoir ecosystem in Lancang River, southwest China

A trophic model of the Pearl River Delta coastal ecosystem

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