Reinitialization of evolutionary clocks during sublethal environmental stress in some invertebrates

Détails

ID Serval
serval:BIB_7BB3AC260E75
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Reinitialization of evolutionary clocks during sublethal environmental stress in some invertebrates
Périodique
Earth and Planetary Science Letters
Auteur(s)
Guex J.
ISSN-L
0012-821X
Statut éditorial
Publié
Date de publication
2006
Peer-reviewed
Oui
Volume
242
Pages
240-253
Langue
anglais
Notes
ISI:000235855100002
Résumé
This paper describes the influence of high environmental stress on
evolutionary trends in some selected Mesozoic ammonite lineages and some
protists. During extinction periods, many ammonoids are affected by
drastic simplifications of their shell geometry, ornamentation and
suture line. We observe that relatively tightly coiled ammonites can
give rise to highly evolute forms or uncoiled heteromorphs with simple
ornamentation and almost ceratitic suture line-a phenomenon called
"proteromorphosis". Such simplifications often correspond to a
reappearance of ancestral geometries (primitive ornamentation, evolute
coiling or uncoiling) which suggest that the evolutionary clock of these
organisms can be reinitialized by extreme, sublethal, environmental
stress such as giant volcanism (including its consequences on diverse
pollutions and on climatic changes) and major regressive events. (c)
2006 Elsevier B.V. All rights reserved.
Création de la notice
19/10/2012 16:48
Dernière modification de la notice
03/03/2018 18:36
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