Testing the Cambrian explosion hypothesis by using a molecular dating technique
نویسندگان
چکیده
منابع مشابه
Testing the Cambrian explosion hypothesis by using a molecular dating technique.
Molecular studies have the potential to shed light on the origin of the animal phyla by providing independent estimates of the divergence times, but have been criticized for failing to account adequately for variation in rate of evolution. A method of dating divergence times from molecular data addresses the criticisms of earlier studies and provides more realistic, but wider, confidence interv...
متن کاملMolecular clocks: Defusing the Cambrian ‘explosion’?
You do not have to believe in punctuated equilibria — and given its status as ideological straw-man par excellence, why should you? — to accept that the history of life shows periods of rapid change separated by evolutionary longueurs of immense duration. In recent years, the socalled Cambrian ‘explosion’ has enjoyed the lion’s share of attention from those interested in periods of apparently r...
متن کاملThe Cambrian explosion
The sudden appearance of fossils that marks the so-called 'Cambrian explosion' has intrigued and exercised biologists since Darwin's time. In On the Origin of Species, Darwin made it clear that he believed that ancestral forms 'lived long before' their first fossil representatives. While he considered such an invisible record necessary to explain the level of complexity already seen in the foss...
متن کاملThe Cambrian Explosion
The Precambrian genesis plus Cambrian explosion scenario also implies a perplexing view of a major evolutionary radiation: a long period of cryptic speciation with increasing developmental complexity and anatomical sophistication, yet without substantial behavioural or ecological modification or diversification, followed by a sudden increase in morphological and ecological innovation. Page 1046...
متن کاملMolecular clocks do not support the Cambrian explosion.
The fossil record has long supported the view that most animal phyla originated during a brief period approximately 520 MYA known as the Cambrian explosion. However, molecular data analyses over the past 3 decades have found deeper divergences among animals (approximately 800 to 1,200 MYA), with and without the assumption of a global molecular clock. Recently, two studies have instead reported ...
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ژورنال
عنوان ژورنال: Proceedings of the National Academy of Sciences
سال: 1998
ISSN: 0027-8424,1091-6490
DOI: 10.1073/pnas.95.21.12386