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Exploring the major depletions of conodont diversity during the Triassic
- Source :
- Historical Biology, Historical Biology, Taylor & Francis, 2015, 27 (5), pp.503-507. ⟨10.1080/08912963.2014.890192⟩
- Publication Year :
- 2014
- Publisher :
- Informa UK Limited, 2014.
-
Abstract
- International audience; In this paper, we show that the Triassic fossil record reflects just two great depletions of conodont diversity before the Rhaetian, which occurred in the Smithian (Olenekian, Early Triassic) and in the Julian (Carnian, Late Triassic). By exploring this context, our results highlighted that they respond to different origination?extinction dynamics. Thus, while the Smithian diversity depletion can be interpreted as a consequence of elevated extinction, the Julian diversity depletion was triggered by fluctuations in origination regime. This evidence suggests that, despite the role of extinction on diversity losses, conodonts suffered crucial changes on the origination regimes during the Late Triassic which triggered these events. Notwithstanding, our results indicate that the end-Triassic diversity depletion of conodonts was produced by background extinction levels in a context of lower origination. This suggests that several biological factors, rather than a unique, environmental and/or cyclic cause, could have influenced the evolutionary history of conodonts during the Triassic.
- Subjects :
- Diversity change
Early Triassic
Context (language use)
Diversity depletion
[SDV.BID.SPT]Life Sciences [q-bio]/Biodiversity/Systematics, Phylogenetics and taxonomy
Paleontology
[SDV.EE.ECO]Life Sciences [q-bio]/Ecology, environment/Ecosystems
Proportional extinction
Origination regime
Background extinction rate
Triassic conodonts
Extinction
Fossil Record
biology
Ecology
social sciences
[SDV.BV.BOT]Life Sciences [q-bio]/Vegetal Biology/Botanics
biology.organism_classification
humanities
[SDE.BE]Environmental Sciences/Biodiversity and Ecology
General Agricultural and Biological Sciences
Conodont
human activities
Origination
Geology
Diversity (business)
Subjects
Details
- ISSN :
- 10292381 and 08912963
- Volume :
- 27
- Database :
- OpenAIRE
- Journal :
- Historical Biology
- Accession number :
- edsair.doi.dedup.....38345c993bb108c78438e9d7bdaa641e