Ref ID : 1909
Elisabeth A. Deimling, William J. Liss, Gary L. Larson, Robert L. Hoffman, and Gregg A. Lomnicky; Rotifer abundance and distribution in the northern Cascade mountains, Washington, USA. Arch.Hydrobiol. 138(3):345-363, 1997
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Few studies of rotifers have focused on North American western mountain systems. In this study of Cascade mountain lakes in Washington state, both cluster analysis and detrended correspondence analysis (DCA) grouped lakes with the same dominant rotifer taxon. With both statistical techniques, each cluster of lakes was associated with characteristic physico-chemical variables and dominant crustacean zooplankton. Small, microphagous, loricate (hard-bodied) rotifers (Keratella or Kellicottia) dominated lakes in 4 of the clusters; these lakes generally had low to moderate nutrient concentrations and low cladoceran densities. Conochilus unicornis dominated lakes in a fifth cluster; these lakes had relatively high levels of alkalinity and conductivity and also had high densities of cladocerans and diaptomids. Collotheca mutabilis dominated a single lake which composed a sixth cluster; this was a large deep lake with low alkalinity and conductivity. No significant relationships were evident between vertebrate predation and rotifer taxa.