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2011 (Vol. 3, Issue: 04)
Article Information:

The Distribution and Seasonality of Benthic Macro-Invertebrates in Sombreiro River, Niger Delta, Nigeria

E.N. Ezekiel, A.I. Hart and J.F.N. Abowei
Corresponding Author:  Abowei Jasper 

Key words:  Benthic Macro-invertebrates, distribution, seasonality, Sombreiro River, Niger Delta, Nigeria,
Vol. 3 , (04): 264-271
Submitted Accepted Published
2011 January, 05 2011 February, 11 2011 April, 20
Abstract:

The distribution and seasonality of benthic macroinvertebrates in Sombreiro River was studied for a perion of two years (August, 2007 - July, 2009). Of the twenty-eight (28) species observed in the area, all the species of the class Oligochaeta did not occur in station1 (Degema) but occurred in the remaining three stations 2 (Ogbele), 3 (Ihuaba) and 4 (Odiemudie). The species recorded were relatively abundant in stations 2, 3 and 4. In station 2 (Ogbele) Paranais sp. (Naididae) was the highest 40.5%; Styleria lacustris (Naididae) 40.6% in station 3 and Uncinais uncinata (Naididae) in station 4. All the species of the class Polychaeta occurred only in station 1 (Degema) but did not occur in the remaining three stations. In terms of percentage all species had 100% but numerically Nephthys hombergi (257) was the highest followed by Notomastus latericeus (124).The only species of the family chironomidae (Chironomus sp.) did not occur in station 1 but occurred in the remaining three stations. The highest percentage occurrence (49.1%) was recorded at station 3 (Ihuaba). Tympanotonus fuscatus and Pachymelania fusca (Potomidae) occurred only in station1 (Degema). Tellina nymphalis, Loripes sp. and Tegalus andersoni occurred only in station 1 (Degema). Station 1 (Degema) had twenty (20) species while stations 2, 3, and 4 had 8species each. The result showed that Ophidonais sapentina had the highest mean value 20.91711.147, (August 2007 - July 2008); 20.5007.891 (August 2008 - July 2009). This was followed by Eiseniella tetrahidra 17.9179.179 (August 2007 - July 2008); 17.4177.476, (August 2008 - July 2009) and Uncinais uncinata 14.6676.443 (August 2007 - July 2008), 14.4175.017 (August 2008 - July 2009). The least was Tellina nymphalis 0.5831.505 (August 2007 - July 2008); 0.3330.651, (August 2008 - July 2009). There was no significant variation in the mean values of the two years studied 5.9000.4168 (August 2007 - July 2008). 5.7170.3704 (August 2008 - July 2009). Seasonal variations occurred in the abundance of Dero sp. (11.005.20 wet, 17.713.72 dry), Stylera lacustris (11.825.15 wet, 18.5010.57 dry) and Eiseniella tetrahidra (18.769.16 wet, 15.004.69 dry). The other species did not show significant variation. However, there was significant variation between the mean of the wet season and that of the dry season 5.320.30 wet and 6.990.58, respectively. The result showed that Ophidonais sapentina had the highest mean value 20.91711.147, (August 2007 - July 2008); 20.5007.891 (August 2008 - July 2009). This was followed by Eiseniella tetrahidra 17.9179.179 (August 2007 - July 2008); 17.4177.476, (August 2008 - July 2009) and Uncinais uncinata 14.6676.443 (August 2007 - July 2008), 14.4175.017 (August 2008 - July 2009). The least was Tellina nymphalis 0.5831.505 (August 2007 - July 2008); 0.3330.651, (August 2008 - July 2009). There was no significant variation in the mean values of the two years studied 5.900 0.4168 (August 2007 - July 2008). 5.7170.3704 (August 2008 - July 2009). Seasonal variations occurred in the abundance of Dero sp.(11.005.20 wet, 17.713.72 dry), Stylera lacustris (11.825.15 wet, 18.5010.57 dry) and Eiseniella tetrahidra (18.769.16 wet, 15.004.69 dry). The other species did not show significant variation. However, there was significant variation between the mean of the wet season and that of the dry season 5.320.30 wet and 6.990.58, respectively.
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  Cite this Reference:
E.N. Ezekiel, A.I. Hart and J.F.N. Abowei, 2011. The Distribution and Seasonality of Benthic Macro-Invertebrates in Sombreiro River, Niger Delta, Nigeria.  Research Journal of Applied Sciences, Engineering and Technology, 3(04): 264-271.
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ISSN (Online):  2040-7467
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