Morphogenesis in Cyclotella ocellata — complex from Lake El’gygytgyn (Chukchi Peninsula) during the Pleistocene-Holocene
The morphology of valves of Cyclotella ocellata from bottom sediments of Lake El’gygytgyn, Chukchi Peninsula, has been studied with help of light and scanning electron microscopes. Considerable variability in the morphology of valves and gradual elimination of forms with big valves were observed upw...
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Veröffentlicht in: | Paleontological journal 2010-12, Vol.44 (10), p.1252-1261 |
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Hauptverfasser: | , , , |
Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | The morphology of valves of
Cyclotella ocellata
from bottom sediments of Lake El’gygytgyn, Chukchi Peninsula, has been studied with help of light and scanning electron microscopes. Considerable variability in the morphology of valves and gradual elimination of forms with big valves were observed upwards the section. The complex evolved by phenotype selection:
kuetzingina
-morphotype was replaced by
ocellatamorphotype
and, in the latest Pleistocene, also by
arctica-
morphotype. Changes in the valve morphology were mainly caused by paleoclimatic fluctuations. |
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ISSN: | 0031-0301 1555-6174 |
DOI: | 10.1134/S0031030110100035 |