Trophic model of the coastal ecosystem of the Bay of Bengal using mass balance Ecopath model

Ullah, Md. Hadayet; Rashed-Un-Nabi, Md.; Al-Mamun, Md. Abdulla

doi:10.1016/j.ecolmodel.2011.11.013

Cited by 45 publications

(17 citation statements)

References 27 publications

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“…) but was comparable to values reported for other coastal systems (e.g., Ullah et al. ). Generally, higher values tend to occur in ecosystems where most fisheries’ target species are of lower trophic levels and only a few large predatory species are caught (Godinot and Allain ); such is the case in the Gulf of Nicoya, where shrimps and small pelagic fishes represent the bulk of the catches.…”

Section: Discussionmentioning

confidence: 99%

The Gulf of Nicoya (Costa Rica) Fisheries System: Two Decades of Change

Alms

Wolff

2019

Mar Coast Fish

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In the early 1990s, ecological and fishery data from the Gulf of Nicoya (Pacific Ocean) were holistically analyzed, and a trophic model was constructed using the Ecopath modeling approach. The results indicated that this tropical estuary, which is a Costa Rican fishery hot spot, was already overexploited by shrimp trawlers and the longline fleet, and recent observations suggest further deteriorations in this system. To evaluate the ecosystem and socioeconomic changes in the Gulf of Nicoya over the last 20 years, the 1993 model was reconstructed with data from 2013 to compare both system states. Although the summary statistics of both states (i.e., 1993 and 2013) suggested that the system maintained its general functionality and even enabled the total harvest to increase by approximately 20%, a more detailed analysis of the levels of the functional groups suggested that the system was further degraded as follows: (1) most shrimp, eel, and catfish species decreased their share in the catches, with severe economic losses for the fishery; (2) of the species that substantially increased their share in the catches, most were short‐lived, low‐value species, such as small pelagic and small demersal fishes; and (3) catches of long‐lived, high‐trophic‐level fish, such as rays, sharks, mackerels, and barracudas, decreased. A picture emerged in which the advancing fishery of low‐trophic‐level species with low economic value enabled the total harvest to increase, while valuable shrimp resources and higher‐trophic‐level species were depleted. These developments caused a tremendous economic loss of approximately 50%.

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Section: Discussionmentioning

confidence: 99%

The Gulf of Nicoya (Costa Rica) Fisheries System: Two Decades of Change

Alms

Wolff

2019

Mar Coast Fish

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“…Furthermore, it is considered a static evaluation of the ecosystem status during the reference period. This model has been applied to assess the trophic structure, energy flows, and ecosystem functions in more than 100 large-scale ecosystems, including oceans, lakes, rivers, and reservoirs (Christensen & Walters 2004;Xu et al 2011;Ullah 2012) since it was developed in 2000 Pauly et al 2000).…”

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 was further developed by Christensen and Pauly (1992). This model has been successfully applied to study the structures and functions of the ecosystems ranging from ponds, rivers, and lakes to estuaries, coral reefs, shelves and open sea , such as applications in Great South Bay (Nuttall et al, 2011), Bengal bay (Ullah et al, 2012), Lake Awassa of Ethiopia (Fetahi and Mengistou, 2007), and the shallow coastal ecosystem of Sri Lanka (Haputhantri et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

On structure and maturity changes of the Bohai Sea ecosystem during the 1980s–1990s

Zheng

You

2014

Aquatic Ecosystem Health &Amp; Management

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To quantify the historical ecosystem changes in the Bohai Sea, the Ecopath models (EWE 6.2) were developed in three time periods (1982-1983, 1992-1993 and 1998-1999), where measured data was available. The trends in the structure, maturity and keystone of the Bohai Sea ecosystem from 1982 to 1999 were assessed and planning and management measures were proposed. Numerical results indicated that (1) the ecosystem size of the Bohai Sea in terms of flow is becoming small; (2) the Bohai Sea has experienced a decline in maturity ascribed to the anthropogenic and natural factors; (3) the Bohai Sea ecosystem is in the developing state. In addition, organisms of the highest trophic level (trophic level ≥3.34), such as Squid, exert significant influences on the Bohai Sea ecosystem, but their biomass is declining. To alleviate and prevent further decline in the ecosystem size in terms of flow and maturity of the Bohai Sea, ecosystembased management and abundance of organisms of the highest trophic level need to be considered in future conservation planning and management.

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Trophic model of the coastal ecosystem of the Bay of Bengal using mass balance Ecopath model

Cited by 45 publications

References 27 publications

The Gulf of Nicoya (Costa Rica) Fisheries System: Two Decades of Change

The Gulf of Nicoya (Costa Rica) Fisheries System: Two Decades of Change

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

On structure and maturity changes of the Bohai Sea ecosystem during the 1980s–1990s

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