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Altitude and seasonal polymorphism of Keratella cochlearis (Rotifera) in lakes of the Auvergne, Central France
- GREEN, J.
- Biological journal of the Linnean Society 1981 v.16 no.1 pp. 55-61
- Rotifera, altitude, lakes, seasonal variation, France
- In July 1980 samples of the rotifer Keratella cochlearis were taken from ten lakes ranging in altitude from 630 to 1244 in above sea level. The total period of sampling was short enough to ensure that seasonal effects were negligible. The mean lorica length and mean posterior spine length showed a positive relationship with lake altitude. This indicates that the lower temperatures at higher altitudes delay the normal summer diminution in size of the lorica and the posterior spine. The conductivity of the lake waters varied from 14 to 100 μmho cm-¹ 20°c-¹, but no relationship to the dimensions of K. cochlearis was found.