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ENVIRONMENTAL VARIABLES AND ECOLOGICAL DISTRIBUTION OF ICHTHYOFAUNA ASSEMBLAGES IN THE CALABAR RIVER, NIGERIA: PRESENT AND FUTURE PROSPECTS

Andem Bassey Andem ; University of Calabar, Department of Zoology and Environmental Biology, Cross River State, Nigeria
Sunday Ben Ekanem ; University of Calabar, Department of Zoology and Environmental Biology, Cross River State, Nigeria
Esien Ene Oku ; University of Calabar, Department of Zoology and Environmental Biology, Cross River State, Nigeria


Puni tekst: hrvatski pdf 872 Kb

str. 159-171

preuzimanja: 176

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Puni tekst: engleski pdf 872 Kb

str. 159-171

preuzimanja: 186

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Sažetak

Studies on environmental variables and ecological distribution of ichthyofauna assemblages were conducted in the Calabar River. Surface water and ichthyofauna were sampled in order to provide baseline or reference data on the Calabar River at present as regard its future prospects. Seasonal variation shows significant differences in surface water temperature, pH, DO, BOD, conductivity, TDS and TSS between sampling stations and insignificant differences in heavy metals such as cadmium, chromium, iron and copper between sampling stations. Twenty six species of fish fauna were identified belonging to twenty two families. Mugilidae, Clariidae, Cichlidae, Gobiidae and Sciaenidae were the most abundant for both wet and dry season, while Clupeidae, Bathyclupeidae, Carangidae and Sphyraenidae were low in the wet season but high in the dry season. Chromium, copper, surface water temperature, DO correlate significantly with the presence of E. fimbriata, B. soporator, M. sebae, C. gariepinus, M. loennbergii, C. guentheri and P. babarus. The overall values of biotic diversity indices ranged from 0.0504-0.0745 for Simpson’s Index, 2.770-3.095 for Shannon Index, 2.821-3.105 for Margalef’s Index and 0.8606-0.9498 for equitability. However, the presence of certain fish fauna in polluted and non-polluted parts of the river indicates that they could be used as potential bioindicators in assessment and biomonitoring of the river. The methods used in identifying fish diversity proved their applicability for future studies.

Ključne riječi

Ecological distribution; Ichthyofauna; Biotic indices; Pollution

Hrčak ID:

169513

URI

https://hrcak.srce.hr/169513

Datum izdavanja:

28.11.2016.

Podaci na drugim jezicima: hrvatski

Posjeta: 877 *