Browsing by Author "Waya, Revania Kiduduye"

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    Dynamics in Shirati Bay, Lake Victoria Tanzania With Special Zooplankton Emphasis on the Copepods
    (University of Dar es Salaam, 2008) Waya, Revania Kiduduye
    The population of dynamics of zooplankton with emphasis on the copepods were studied Shirati Bay, Lake Victoria, between March 2005 and March 2006. The study revealed spatio-temporal variations in zooplankton distribution and the factors influencing their distribution, abundance and composition. Factors affecting zooplankton density, biomass and distribution in Shirat Bay were found to include food condition, predation, temperature, wind, light and transparency. There was significant correlation between zooplankton abundance and the bacillariophytes (r = 0.9454,n=13,p<0.0001),Rotifera biomass and cyanophytes (r=08264, n =13,p<0.0001)there was a significant association between abundance of fish and zooplankton (Matel test: Standard normal Variate g(1,1000)=7.0834, p=0.009,r=0405, and abundance of haplochromines and zooplankton (g 1,1000) = 6.348, p=0.001,r = 0.888). also the linear correlation analysis revealed significant correlation between temperature and number of ovigerous female copepod (r= -05585, n=13, p=0.0473). three groups of zooplankton were recorded namely, Copepoda, Rotifera, and Cladocera. A total of 44 species were recorded, Rotifera showed highest diversity index (H’) of 2.321. Copepoda was the most important group in terms of abundance and biomass among them cyclopoid copepod dominated the zooplankton community throughout the study period. Nauplius and Cyclpopoid Copepodites in Shirati Bay During March 2005 –March2006 0 MAR-05 APR 05 MAY 05 JUN 05 JUL 05 AUG 05 SEP 05 0CT 05 N0V 05 MAR O5 0.000 0.741 0.647 0.816 0.789 0.800 0.989 0.929 APR 05 2.770 0.000 1.000 1.000 1.000 1.000 1.000 1.000 MAY 05 3.010 0.240 0.000 1.000 1.000 1.000 0.997 1.000 JUN 05 2.558 0.212 0.451 0.000 1.000 1.000 1.000 1.000 JUL 05 2.639 0.131 0.371 0.081 0.000 1.000 1.000 1.000 AUG05 2.606 0.164 0.404 0.048 0.033 0.000 1.000 1.000 SEP 05 1.624 1.146 1.386 0.935 1.015 0.983 0.000 1.000 OCT 05 2.139 0.631 0.871 0.419 0.500 0.467 0.515 0.000 NOV 05 1.324 1.446 1.686 1.234 1.315 1.282 0300 0.815 DEC O5 2.807 0.037 0.203 0.249 0.168 0.201 1.183 0.668 JSN 05 0.220 2.550 2.790 2.339 2.419 2.386 1.404 1.919 FEB 06 3.755 6.525 6.765 6.313 6.394 6.361 5.378 5.894 MAR 06 1.754 4.524 4.764 4.312 4.393 4.360 3.378 3.893 Values in bold indicate significant differences among months.