A preliminary snapshot of the trophic model and ecosystem attributes of Kaptai reservoir ecosystem, Bangladesh -- Journal of Oceanology and Limnology,2021,39(1):223-241

	Cite this paper:
	Mst Halima KHATUN, Partho Protim BARMAN, YI Jundong, Saymuna Tarin LUPA, Md Mahiuddin ZAHANGIR, Qun LIU. A preliminary snapshot of the trophic model and ecosystem attributes of Kaptai reservoir ecosystem, Bangladesh[J]. Journal of Oceanology and Limnology, 2021, 39(1): 223-241

A preliminary snapshot of the trophic model and ecosystem attributes of Kaptai reservoir ecosystem, Bangladesh

Mst Halima KHATUN¹, Partho Protim BARMAN¹, YI Jundong¹, Saymuna Tarin LUPA², Md Mahiuddin ZAHANGIR³, Qun LIU¹

1 College of Fisheries, Ocean University of China, Qingdao 266003, China;
2 Department of Fisheries Management, Bangladesh Agricultural University, Mymensingh 2202, Bangladesh;
3 Department of Fish Biology and Biotechnology, Chattogram Veterinary and Animal Sciences University, Chattogram-4225, Bangladesh

Abstract:

A mass-balanced Ecopath model presents a quantitative description of the trophic structure, flow of energy and trophic interaction among ecological groups of an ecosystem. The Ecopath with Ecosim (EwE) modeling program (Version 6.5) was used to develop a preliminary trophic model for a tropical freshwater reservoir. The total fish biomass was 6.245 t/km² and the highest trophic level of the reservoir was 3.362 (for snakehead). The ecosystem is phytoplankton based because primary producers originated 68% and detritus originated 32% of the total flow from lower trophic level. The gross efficiency of the fishery was 0.004, suggesting the inefficiency of the system. The positive effect of phytoplankton and detritus on most of the other groups were evident from mixed trophic analysis while moderately higher ecotrophic efficiency (EE) of phytoplankton shows the ecosystem's potential bottom-up control. The competition for the same resources among different groups was also obvious. The ratio of primary production/respiration (1.969) suggests that the ecosystem is at the developing stage and utmost contemplation should be given to concerned human activities. The low value of relative ascendancy (30.13) and overhead (69.87) reveals the stability of the ecosystem and some degrees of maturity. It also predicts the presence of significant strength in reserve of the system to withstand or overcome any perturbation. However, ecologically sustainable resource management plans should be implemented to ensure the sustainability of this reservoir resources.

Key words: Ecopath|Kaptai reservoir|trophic interaction|transfer efficiency|energy flow

Received: 2019-10-25 Revised: 2020-01-04

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