ON THE ISSUE OF ECOLOGICAL FORMS OF WHITEFISH (COREGONUS LAVARETUS PIDSCHIAN) OF THE TAIMYR PENINSULA.
The ichtyofauna of Lake Taimyr includes two forms of the Siberian whitefish Coregonus lavaretuspidschian, a lake species with a higher body shape and a river-lake species with a lower body shape, both as described by Mikhin in 1955. Mikhin found that these forms are not only in Lake Taimyr, but also in its influxes. These species differ in nutrition preferences. The lake whitefish is a bottom-feeder while the river-lake whitefish is a predator. Study of the morphology of these species revealed considerable differences in number of vertebrae and a majority of other plastic indices. Based on body height, length of pectoral fin, and length of the upper jaw, the differences between the two species exceed the subspecies level of Meier's CR criteria chart.
Keywords: lake Taimyr, charr, sympatry, nutrition, species, morphology, differences
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Issue: 11, 2009
Series of issue: Issue 11
Rubric: Biology
Pages: 186 — 193
Downloads: 1725