Tag Archives: Polychaete

Benthic Macro-Fauna Species Composition and Abundance in the Lower Sombreiro River, Niger Delta, Nigeria (Published)

The present study was designed to determine the species composition and abundance of the benthic community along the brackish water axis of the Sombreiro River, for a period of 24 – months from April, 2012 to March, 2014. Sub-sea sediment samples were collected on monthly basis in 10 sites and analyzed for macro-benthic organisms. The benthic macro-faunal community was represented by 8 species from 4 different phyla and 6 classes.Polychaetes were the most dominant class with 3 species and the others – Crustacea, Insecta, Gastropoda, Bivalvia and Pisces were represented by 1species each. While polychaetes and gastropods were observed in all stations others were found in only one site each. Polychaetes were the most abundant with 104 individuals representing 70.27%, followed by Gastropoda with 39 individuals (26.35%), Insecta is next with 2 individuals (1.35%) and others (Crustacea, Bivalvia and Pisces) contributed 1 individual each (0.67%).

Keywords: Benthic macro-fauna, Erkman Grab, Gastropoda, Polychaete, Sub-sea sediment

Physiochemical Factors Affecting Macrobenthic Invertebrates Disribution in the Bottom Sediments of Okhuo River (Published)

Nigerian benthos has been concentrated on the benthic fauna of urban and semi urban areas; consequently, the rural waters have been abandoned. The taxonomy of Nigerian streams is poorly known and this probably contributes to the reluctance to carry out researches in these areas. The macrobenthic invertebrates of a perturbed urban section of the Ikpoba River, showed that the stress caused by human activities affected species diversity and abundance on the benthic fauna of New Calabar River, in Cross River State. The study showed that the diversity of the fauna was low, with only 23 taxa recorded. The fauna was dominated by Annelid (Polychaete and Oligochaete) that constitutes 54% of the population. Investigation shows the effect of salinity and other physicochemical factors in abundance and distribution of littoral invertebrates in a coastal lagoon of southern examined flora and fauna associated with water hyacinth in Yewa River, in Ondo State. Studies of the benthic fauna associated with different microhabitats in mangrove forest of the Bonny Estuary, Niger Delta, and Nigeria showed that the number of species associated with a particular habitat was similar but the community structure differed distinctly.

Keywords: Environmental Impacts, Habitat, Macrobenthic Invertebrates, Oligochaete, Polychaete