Changes in the latitudinal diversity gradient during the Great Ordovician Biodiversification Event

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http://hdl.handle.net/10138/308336

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Kröger , B 2018 , ' Changes in the latitudinal diversity gradient during the Great Ordovician Biodiversification Event ' , Geology , vol. 46 , no. 2 , pp. 127-130 . https://doi.org/10.1130/G39587.1

Title: Changes in the latitudinal diversity gradient during the Great Ordovician Biodiversification Event
Author: Kröger, Björn
Contributor organization: Finnish Museum of Natural History
Natural Sciences Unit
Date: 2018-02
Language: eng
Number of pages: 4
Belongs to series: Geology
ISSN: 0091-7613
DOI: https://doi.org/10.1130/G39587.1
URI: http://hdl.handle.net/10138/308336
Abstract: Near-equatorial peak diversities are a prominent first-order feature of today's latitudinal diversity gradient (LDG), but were not a persistent pattern throughout geological time. In an analysis of Ordovician (485-444 Ma) fossil occurrences, an equatorward shift of the latitudinal diversity peak can be detected. A modern-type LDG and out-of-the-tropics range shift pattern were synchronously established during emerging icehouse conditions at the climax of the Great Ordovician Biodiversity Event. The changes in the LDG pattern and range shift trends can be best explained as a consequence of global cooling during the Middle Ordovician and of diversification in the tropical realm following a greenhouse period with temperatures too hot to support diverse tropical marine life. These results substantiate a fundamental role of temperature changes in establishing global first-order diversity patterns.
Subject: 1171 Geosciences
SPECIES-DIVERSITY
RADIATION
PATTERNS
CLIMATE
TROPICS
ENERGY
OCEANS
ONSET
TIME
Peer reviewed: Yes
Rights: cc_by
Usage restriction: openAccess
Self-archived version: acceptedVersion


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