Morphological trends and rates of evolution in arvicolids (arvicolidae, rodentia): Towards a punctuated equilibria/disequilibria model
Identifieur interne : 002F69 ( Main/Exploration ); précédent : 002F68; suivant : 002F70Morphological trends and rates of evolution in arvicolids (arvicolidae, rodentia): Towards a punctuated equilibria/disequilibria model
Auteurs : J. Chaline [France] ; B. Laurin [France] ; P. Brunet-Lecomte [France] ; L. Viriot [France]Source :
- Quaternary International [ 1040-6182 ] ; 1993.
Abstract
This paper seeks to test morphological trends and rates of evolution using both paleontology and biology. Two major morphological trends are observed in the fossil record: morphological stasis and phyletic gradualism. The ‘how often?’ statistical test of the European arvicolid rodent radiation shows (1) that over 5 Ma, 52 lineages appear (FAD) by allopatric speciation, of which 34 die out (LAD) in the same time span; (2) that cumulative phyletic gradualism (diachrons) accounts for around 63 % of evolutionary trends, whereas stasis accounts for only 37%; (3) that morphological changes occur either by phyletic gradualism through successive distinct diachrons (73% of morphological changes) or during punctuations (27% of morphological changes). Thus it is clear that, from a theoretical point of view, the punctuated equilibria model must be complemented by a disequilibria component which includes phyletic gradualism. As phyletic gradualism is partly serial, the punctuated equilibria/disequilibria model can be described by a linear and periodic equation established on the basis of a Plio-Pleistocene Mimomys lineage.
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DOI: 10.1016/1040-6182(93)90019-C
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Two major morphological trends are observed in the fossil record: morphological stasis and phyletic gradualism. The ‘how often?’ statistical test of the European arvicolid rodent radiation shows (1) that over 5 Ma, 52 lineages appear (FAD) by allopatric speciation, of which 34 die out (LAD) in the same time span; (2) that cumulative phyletic gradualism (diachrons) accounts for around 63 % of evolutionary trends, whereas stasis accounts for only 37%; (3) that morphological changes occur either by phyletic gradualism through successive distinct diachrons (73% of morphological changes) or during punctuations (27% of morphological changes). Thus it is clear that, from a theoretical point of view, the punctuated equilibria model must be complemented by a disequilibria component which includes phyletic gradualism. As phyletic gradualism is partly serial, the punctuated equilibria/disequilibria model can be described by a linear and periodic equation established on the basis of a Plio-Pleistocene Mimomys lineage.</div></front></TEI><affiliations><list><country><li>France</li></country><region><li>Bourgogne</li><li>Bourgogne-Franche-Comté</li></region><settlement><li>Dijon</li></settlement></list><tree><country name="France"><region name="Bourgogne-Franche-Comté"><name sortKey="Chaline, J" sort="Chaline, J" uniqKey="Chaline J" first="J." last="Chaline">J. Chaline</name></region><name sortKey="Brunet Lecomte, P" sort="Brunet Lecomte, P" uniqKey="Brunet Lecomte P" first="P." last="Brunet-Lecomte">P. Brunet-Lecomte</name><name sortKey="Laurin, B" sort="Laurin, B" uniqKey="Laurin B" first="B." last="Laurin">B. Laurin</name><name sortKey="Viriot, L" sort="Viriot, L" uniqKey="Viriot L" first="L." last="Viriot">L. 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