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The Distribution, Abundance and Seasonality of Benthic Macro Invertebrate in Okpoka Creek Sediments, Niger Delta, Nigeria
並列摘要
The distribution, abundance and seasonality of benthic macro invertebrates in Okpoka creek sediments were studied for a period of one year (January-December 2006). Polychaeta was highest and constituted 82.8%. The others were Bivalvia (4.6%), Crustacea (4.5%) and Oligochaeta (3.9%), Gastropoda (2.1%) and Insecta (2.0%). From nineteen (19) species encountered in the area, all the species of the class (Polychaeta) with the exception of Nereis virens occurred in all the stations. The species found were relatively more abundant in stations 5 and 6. However, Ophidonais serpentina occurred only in stations 1 and 2 but more abundant (91.4%) in station 1. Clibernarius cooci and Iphinoe tripanosa were absent in station 2. Iphinoe tripanosa was more abundant (35.9%) in station 1 than the rest of the stations. Stations 1, 2 and 4 had seventeen (17) species each. Eighteen (18) species each were recorded in stations 3, 5 and 6. There was seasonal variation in the abundance of only Ophidonais serpentine (20.0±14.6 dry, 115.24±25.49 wet); Eunice harassi (26.88±3.53 dry, 47.78±5.45 wet); and Nereis pelegica, (21.92±4.14 dry, 40.96±8.32 wet). There were no significant seasonal differences in the other species encountered. The Shannon-Weaver and Margalef diversity values calculated generally show a high species diversity. The calculated values of Shannon-Weaver and Margalef diversity was maximum in November with H=1.44, M=5.64 and J=0.911 and H=1.136, M=5.082 and J=0.923 respectively. The lowest values (H=0.87, M=3.852, J=0.806) were observed in August. Pielou's index of relative density or evenness (J=0.911; 0.923) revealed that the species w ere evenly distributed in the study area in February, October and November. The lowest evenness occurred in July.
延伸閱讀
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