Preliminary Ecopath model of a tropical coastal estuarine ecosystem around bight of Benin, Nigeria
| Autor: | E. O. Adekoya, W. O. Abdul |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
0106 biological sciences
Biomass (ecology) geography Detritus geography.geographical_feature_category 010504 meteorology & atmospheric sciences Ecology 010604 marine biology & hydrobiology Estuary Aquatic Science 01 natural sciences Food web Food chain Environmental science Ascendency Ecosystem Ecology Evolution Behavior and Systematics 0105 earth and related environmental sciences Trophic level |
| Zdroj: | Environmental Biology of Fishes. 99:909-923 |
| ISSN: | 1573-5133 0378-1909 |
| Popis: | The tropical coastal estuarine ecosystem around Bight of Benin, Nigeria has huge economic importance with limited information on its status and possible impact of fishing. An Ecopath model was constructed to study the trophic interactions and ecosystem properties of the estuary using fourteen functional groups. The model input parameters were gathered from published reports and catch assessment survey. Using network analysis, the system network was mapped into a linear food chain, and five discrete trophic levels were found with a mean transfer efficiency of 7.0 % from detritus and 6.1 % from primary producer. The mixed trophic impact routine showed that functional groups in lower trophic levels had smattering positive and negative impacts across the food web. The ecosystem indices: total primary productivity to total respiration ratio (6.325), total primary productivity to total biomass ratio (82.621), Finn’s cycling index (1.70), mean path length (2.298), connectance index (0.327), system omnivory index (0.288), ascendency (42.3 %) and overhead (57.7 %) showed that the estuarine ecosystem was at the developing stage, stable, susceptible to stress induced changes and could withstand unexpected external perturbation at its present stage. |
| Databáze: | OpenAIRE |
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