Macroinvertebrates functional feeding groups as indices of biological assessment in a tropical aquatic ecosystem: implications for ecosystem functions
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Uwadiae, R. E.
New York Science Journal
The composition and abundance of functional feeding groups of the benthic macroinvertebrate communities were investigated along the stretch of Epe lagoon in south-west Nigeria, between September, 2004 and August, 2006. The hypothesis being tested was that functional feeding groups of benthic macroinvertebrates can be used as surrogate for biological assessment. Quantitative benthic samples were collected monthly at 8 sites. Total dissolved solids of the overlying water, total organic, sand and mud contents of sediment were assessed. The amount of dissolved solids recorded in this study ranged between 18 and 15,200mg/L. There was significant difference (P<0.05) in total dissolved solids at the study stations. The total dissolved solids at stations 1 to 3 were similar and significantly lower (P<0.05) than those at stations 4 to 8.The study area was predominantly sandy (range = 54.4 to 93.6%) intermixed with varying proportions of mud (range = 1.01 to 44.6%). A comparatively higher proportion of mud in sediment was recorded in station 3. Total organic content ranged between 1.01 and 10.45%. In terms of relative abundance, collector-filterers and shredders were the predominant groups at most sites. They contributed 77 and 15% respectively to the total benthic macroinvertebrate population. Predators had low abundance in all the study sites and were absent in sites 6 and 8. Correlation between Total organic content and density of collector filterers at the study sites was significant (P < 0.01). Although there was a marked variation in the density of the observed functional feeding groups in the stations used for this study and sequential downstream changes in species composition, most functional feeding groups (apart from predators) were represented down the whole length of the study stretch. The implications of the observed pattern of variation in the density of functional feeding groups, for water quality assessment and ecosystem functions are discussed.
Feeding functional groups , Tropical ecosystem , Water quality assessment , Biological assessment , Research Subject Categories::NATURAL SCIENCES
Uwadiae, R.E. (2010). Macroinvertebrates functional feeding groups as indices of biological assessment in a tropical aquatic ecosystem: implications for ecosystem functions. New York Science Journal, Vol.3(8): 6-15pp.