Ref ID : 670
Austin B.M. Egborge and L. Ogbekene; Cyclomophosis in Keratella tropica (Apstein) of Lake Asejire, Nigeria. Hydrobiologia 135:179-191, 1986
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Of one thousand, one hundred and four (1104), Keratella tropica collected with a 55 um mesh plankton net from the surface of Lake Asejire from February 1974 to February 1976 lorica length and width, and the lengths of the posterior spines were measured. Lake Asejire K. tropica are among the smallest in Africa. Variations in the patterns of spine length development were independent of season as individuals without left posterior spines and with relatively long left and right posterior spines occurred as commonly in the rainy as in the dry season months. Correlations between K. tropica dimensions and thirty environmental factors underscore the importance of physical environmental factors and point to biological and genetic factors as determinants of the patterns of cyclomorphosis in K. tropica.