The rise of the rhizosolenid diatoms.
Science
; 304(5670): 584-7, 2004 Apr 23.
Article
in En
| MEDLINE
| ID: mdl-15105500
ABSTRACT
The 18S ribosomal DNA molecular phylogeny and lipid composition of over 120 marine diatoms showed that the capability to biosynthesize highly branched isoprenoid (HBI) alkenes is restricted to two specific phylogenetic clusters, which independently evolved in centric and pennate diatoms. The molecular record of C25 HBI chemical fossils in a large suite of well-dated marine sediments and petroleum revealed that the older cluster, composed of rhizosolenid diatoms, evolved 91.5 +/- 1.5 million years ago (Upper Turonian), enabling an accurate dating of the pace of diatom evolution that is unprecedented. The rapid rise of the rhizosolenid diatoms probably resulted from a major reorganization of the nutrient budget in the mid-Cretaceous oceans, triggered by plate tectonics.
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Collection:
01-internacional
Database:
MEDLINE
Main subject:
Terpenes
/
Diatoms
/
Geologic Sediments
/
Alkenes
/
Biological Evolution
Language:
En
Journal:
Science
Year:
2004
Document type:
Article
Affiliation country:
Netherlands
Publication country:
EEUU
/
ESTADOS UNIDOS
/
ESTADOS UNIDOS DA AMERICA
/
EUA
/
UNITED STATES
/
UNITED STATES OF AMERICA
/
US
/
USA