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Biogeographic and bathymetric determinants of brachiopod extinction and survival during the late ordovician mass extinction

Finnegan, Seth; Rasmussen, Christian M Ø LU and Harper, David A T LU (2016) In Proceedings of the Royal Society B: Biological Sciences 283(1829).
Abstract

The Late Ordovician mass extinction (LOME) coincided with dramatic climate changes, but there are numerous ways in which these changes could have driven marine extinctions. We use a palaeobiogeographic database of rhynchonelliform brachiopods to examine the selectivity of Late Ordovician-Early Silurian genus extinctions and evaluate which extinction drivers are best supported by the data. The first (latest Katian) pulse of the LOME preferentially affected genera restricted to deeper waters or to relatively narrow (less than 35°) palaeolatitudinal ranges. This pattern is only observed in the latest Katian, suggesting that it reflects drivers unique to this interval. Extinction of exclusively deeperwater genera implies that changes in... (More)

The Late Ordovician mass extinction (LOME) coincided with dramatic climate changes, but there are numerous ways in which these changes could have driven marine extinctions. We use a palaeobiogeographic database of rhynchonelliform brachiopods to examine the selectivity of Late Ordovician-Early Silurian genus extinctions and evaluate which extinction drivers are best supported by the data. The first (latest Katian) pulse of the LOME preferentially affected genera restricted to deeper waters or to relatively narrow (less than 35°) palaeolatitudinal ranges. This pattern is only observed in the latest Katian, suggesting that it reflects drivers unique to this interval. Extinction of exclusively deeperwater genera implies that changes in water mass properties such as dissolved oxygen content played an important role. Extinction of genera with narrow latitudinal ranges suggests that interactions between shifting climate zones and palaeobiogeography may also have been important. We test the latter hypothesis by estimating whether each genus would have been able to track habitats within its thermal tolerance range during the greenhouse-icehouse climate transition. Models including these estimates are favoured over alternative models. We argue that the LOME, long regarded as non-selective, is highly selective along biogeographic and bathymetric axes that are not closely correlated with taxonomic identity.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Biogeography, Brachiopoda, Climate change, Extinction, Ordovician
in
Proceedings of the Royal Society B: Biological Sciences
volume
283
issue
1829
publisher
Royal Society
external identifiers
  • scopus:84964725472
  • wos:000376158600009
ISSN
0962-8452
DOI
10.1098/rspb.2016.0007
language
English
LU publication?
yes
id
6281587a-bcdd-45a6-baa9-ae27eb7d4797
date added to LUP
2016-10-07 10:27:47
date last changed
2017-03-26 04:45:45
@article{6281587a-bcdd-45a6-baa9-ae27eb7d4797,
  abstract     = {<p>The Late Ordovician mass extinction (LOME) coincided with dramatic climate changes, but there are numerous ways in which these changes could have driven marine extinctions. We use a palaeobiogeographic database of rhynchonelliform brachiopods to examine the selectivity of Late Ordovician-Early Silurian genus extinctions and evaluate which extinction drivers are best supported by the data. The first (latest Katian) pulse of the LOME preferentially affected genera restricted to deeper waters or to relatively narrow (less than 35°) palaeolatitudinal ranges. This pattern is only observed in the latest Katian, suggesting that it reflects drivers unique to this interval. Extinction of exclusively deeperwater genera implies that changes in water mass properties such as dissolved oxygen content played an important role. Extinction of genera with narrow latitudinal ranges suggests that interactions between shifting climate zones and palaeobiogeography may also have been important. We test the latter hypothesis by estimating whether each genus would have been able to track habitats within its thermal tolerance range during the greenhouse-icehouse climate transition. Models including these estimates are favoured over alternative models. We argue that the LOME, long regarded as non-selective, is highly selective along biogeographic and bathymetric axes that are not closely correlated with taxonomic identity.</p>},
  articleno    = {20160007},
  author       = {Finnegan, Seth and Rasmussen, Christian M Ø and Harper, David A T},
  issn         = {0962-8452},
  keyword      = {Biogeography,Brachiopoda,Climate change,Extinction,Ordovician},
  language     = {eng},
  month        = {04},
  number       = {1829},
  publisher    = {Royal Society},
  series       = {Proceedings of the Royal Society B: Biological Sciences},
  title        = {Biogeographic and bathymetric determinants of brachiopod extinction and survival during the late ordovician mass extinction},
  url          = {http://dx.doi.org/10.1098/rspb.2016.0007},
  volume       = {283},
  year         = {2016},
}