Trophic network and food web characteristics in a tropical monsoonal estuary: A comparison with other estuarine systems

Sreekanth, G B and Chakraborty, S K and Jaiswar, A K and Zacharia, P U and Mohamed, K S and Francour, Patrice (2020) Trophic network and food web characteristics in a tropical monsoonal estuary: A comparison with other estuarine systems. Indian Journal of Geo Marine Sciences, 49 (5). pp. 774-789. ISSN 2582-6727

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Official URL: http://nopr.niscair.res.in/handle/123456789/54731
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Abstract

A mass-balance trophic model for Zuari, a monsoon-influenced tropical Indian estuary, was constructed to understand trophic organization, to measure the ecosystem indicators and to assess the state of the ecosystem maturity and stability. Twenty-two functional groups were identified in the model starting from primary producers (trophic level = 1) to top predators (trophic level = 4.7). The estuarine food web is controlled by bottom-up control based on primary producers and detritus. Phytoplankton, zooplankton, clupeids & anchovies and heterotrophic benthos were observed as keystone species in the food web. A higher total system throughput (23333.9 t km-2 year-1), and lower dimensions for recycling capacity (Finn’s cycling index: 2.78 %), system omnivory index (0.25), and relative ascendency (39.9 %) were observed. Based on the ecosystem indices, Zuari estuary is relatively small, and developing ecosystem, which is resilient to the external disturbances on the system. This trophic model is the first Ecopath model for tropical monsoonal estuaries and fourth model for the estuaries along the Indian coast. The Zuari estuary model showed resemblance to the sub-tropical and tropical estuarine Ecopath models and differed from estuaries of India and temperate estuaries. This Ecopath model would be also useful for simulating the variations in trophic flows and biomass for functional groups under the impact of fishing and anthropogenic activities on the ecosystem.

Item Type: Article
Uncontrolled Keywords: Ecosystem maturity, Ecosystem model, Keystone species, Monsoonal estuary, Trophic organization, Zuari
Subjects: Marine Environment
Marine Ecosystems
Divisions: CMFRI-Kochi > Marine Capture > Demersal Fisheries
Subject Area > CMFRI > CMFRI-Kochi > Marine Capture > Demersal Fisheries
CMFRI-Kochi > Marine Capture > Demersal Fisheries
Subject Area > CMFRI-Kochi > Marine Capture > Demersal Fisheries

CMFRI-Kochi > Marine Capture > Molluscan Fisheries
Subject Area > CMFRI > CMFRI-Kochi > Marine Capture > Molluscan Fisheries
CMFRI-Kochi > Marine Capture > Molluscan Fisheries
Subject Area > CMFRI-Kochi > Marine Capture > Molluscan Fisheries
Depositing User: Arun Surendran
Date Deposited: 30 Nov 2021 04:57
Last Modified: 08 Apr 2022 08:37
URI: http://eprints.cmfri.org.in/id/eprint/15543

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