Quantitative Aspekte der regressiven Evolution – dargestellt am Beispiel der Augenrückbildung bei Höhlenfischen |
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Authors: | N Peters |
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Institution: | Zoologisches Institut and Zoologisches Museum der Universität Hamburg;Zoologisches Institut and Zoologisches Museum der Universität, Martin-Luther-King-Platz 3, D-2000 Hamburg 13, FRG |
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Abstract: | Quantitative aspects of regressive evolution – demonstrated by the reduction of the eyes in cave fishes According to our present understanding, the eyes of cave fishes are no longer subject to a stabilizing selection. Because of a strong mutation pressure in the destructive direction, this leads to a continual enrichment of elimination mutants and thereby to a progressive reduction of the eyes after separation of a cave population. Obviously a natural selection process does not play a significant role in the reduction of the eyes in cave fishes. Based on these findings, the degeneration process can be characterized in detail, especially concerning its course and duration. |
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Keywords: | Regressive Evolution Polygenic systems Evolutionary tempo Eye reduction |
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