Morphological variation of <Emphasis Type="Italic">Keratella cochlearis</Emphasis> (Gosse) in Myanmar (Burma) in relation to zooplankton community structure |
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Authors: | J Green |
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Institution: | (1) 17 King Edwards Grove, Teddington, Middx, TW11 9LY, UK |
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Abstract: | Keratella cochlearis was present in 27 of 35 water bodies sampled in Myanmar, and was the most abundant rotifer in 10. Measurements of lorica
length and posterior spine length from 20 localities showed that posterior spine length varied both with lorica length and
with the composition of the crustacean zooplankton. Long spines were associated with dominance by Heliodiaptomus. The shortest spines were found in samples dominated by cladocerans or cyclopoid copepods. Posterior spine length was positively
correlated with the number of diaptomid copepods. Forms without posterior spines were found in 17 localities. The lorica lengths
of these spineless forms were generally similar to those of co-occurring spined forms (r = 0.68), but in a few samples the loricas of the spineless forms were significantly larger. These larger forms are similar
to the ‘aspina’ forms recently recognised in the River Thames in England. These samples were dominated by cladocerans or cyclopoid
copepods. In one locality spineless forms were found without spined forms. The crustacean zooplankton in this locality was
also dominated by cladocerans.
Guest editors: S. S. S. Sarma, R. D. Gulati, R. L. Wallace, S. Nandini, H. J. Dumont & R. Rico-Martínez
Advances in Rotifer Research |
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Keywords: | Keratella Spine length Community structure Myanmar |
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