Abstract
The effect of fire on weed species diversity, population density and the level of organic matter content in soil in Birnin-Yauri Local Government Area, Kebbi State, Nigeria were investigated. The results obtained indicated disappearance of Panicum laetum (a grass), Cyperus rotundus (a sedge) and the two broadleaf species with procumbent habits, Ipomoea cylindrical and Tridex procumbens, but there was increase in population density of the broadleaf species that were erect with woody stems. In the control plot, C. rotundus and I. cylindrical recorded the highest increase in density and the erect broadleaf, Senna tora was more or less stable in numbers but Sida acuta doubled in soil decrease gradually with increase in frequency of burning.
Highlights
Fishery resources are important sources of dietary proteins in most coastal communities in Nigeria and the world at large
Pesticides reach the aquatic environment in a variety of ways: runoffs or drainage from treated agricultural lands
The effect is observed as acute poisoning when introduced at high concentration levels
Summary
Fishery resources are important sources of dietary proteins in most coastal communities in Nigeria and the world at large. Many industries use insecticides in their processes and the effluents from such factories contain large amounts of organo chloride insecticides such as deldrin, which are used in large quantities for moth-proofing by wood makers and carpet manufacturers. It is primarily estuarine, but extends to fresh and salt waters, tolerating high salinities but sensitive to temperature and very fragile. But extends to fresh and salt waters, tolerating high salinities but sensitive to temperature and very fragile They are primarily detritivores, feeding on alga, phytoplankton and aquatic vegetation and can grow and reproduced within a pH range of 3.5-5.2. Survival of S. melanotheron fingerlings exposed to various concentration levels of perfekthion organophosphate insecticide is needed to add to knowledge of their feeding, growth and response to pollutants to establish tolerance limit for perfekthion organophosphate insecticide in brackish water bodies for management decisions in similar water bodies
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