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The breakdown of static and evolutionary allometries during climatic upheaval

The breakdown of static and evolutionary allometries during climatic upheaval
The breakdown of static and evolutionary allometries during climatic upheaval
The influence of within-species variation and covariation on evolutionary patterns is well established for generational and macroevolutionary processes, most prominently through genetic lines of least resistance. However, it is not known whether intraspecific phenotypic variation also directs microevolutionary trajectories into the long term when a species is subject to varying environmental conditions. Here we present a continuous, high-resolution bivariate record of size and shape changes among 12,633 individual planktonic foraminifera of a surviving and an extinct-going species over 500 thousand years. This time interval spans the late Pliocene to earliest Pleistocene intensification of Northern Hemisphere glaciation, an interval of profound climate upheaval that can be divided into three phases of increasing glacial intensity. We found that within each of these three Plio-Pleistocene climate phases the within-population allometries predict evolutionary change from one time-step to the next, and that the within-phase among-population (i.e. evolutionary) allometries match their corresponding static (within-population) allometries. However, the evolutionary allometry across the three climate phases deviates significantly from the static and phase-specific evolutionary allometries in the extinct-going species. Although intraspecific variation leaves a clear signature on mean evolutionary change from one time-step to the next, our study suggests that the link between intraspecific variation and longer-term micro- and macroevolutionary phenomena is prone to environmental perturbation that can overcome constraints induced by within-species trait covariation.
0003-0147
350-362
Brombacher, Anieke
2a4bbb84-4743-4a36-973b-4ad2bf743154
Wilson, Paul A.
f940a9f0-fa5a-4a64-9061-f0794bfbf7c6
Bailey, Ian
635ff85d-4492-45be-bdf5-b54a2762a703
Ezard, Thomas H.G.
a143a893-07d0-4673-a2dd-cea2cd7e1374
Brombacher, Anieke
2a4bbb84-4743-4a36-973b-4ad2bf743154
Wilson, Paul A.
f940a9f0-fa5a-4a64-9061-f0794bfbf7c6
Bailey, Ian
635ff85d-4492-45be-bdf5-b54a2762a703
Ezard, Thomas H.G.
a143a893-07d0-4673-a2dd-cea2cd7e1374

Brombacher, Anieke, Wilson, Paul A., Bailey, Ian and Ezard, Thomas H.G. (2017) The breakdown of static and evolutionary allometries during climatic upheaval. The American Naturalist, 190 (3), 350-362. (doi:10.1086/692570).

Record type: Article

Abstract

The influence of within-species variation and covariation on evolutionary patterns is well established for generational and macroevolutionary processes, most prominently through genetic lines of least resistance. However, it is not known whether intraspecific phenotypic variation also directs microevolutionary trajectories into the long term when a species is subject to varying environmental conditions. Here we present a continuous, high-resolution bivariate record of size and shape changes among 12,633 individual planktonic foraminifera of a surviving and an extinct-going species over 500 thousand years. This time interval spans the late Pliocene to earliest Pleistocene intensification of Northern Hemisphere glaciation, an interval of profound climate upheaval that can be divided into three phases of increasing glacial intensity. We found that within each of these three Plio-Pleistocene climate phases the within-population allometries predict evolutionary change from one time-step to the next, and that the within-phase among-population (i.e. evolutionary) allometries match their corresponding static (within-population) allometries. However, the evolutionary allometry across the three climate phases deviates significantly from the static and phase-specific evolutionary allometries in the extinct-going species. Although intraspecific variation leaves a clear signature on mean evolutionary change from one time-step to the next, our study suggests that the link between intraspecific variation and longer-term micro- and macroevolutionary phenomena is prone to environmental perturbation that can overcome constraints induced by within-species trait covariation.

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Brombacher et al Am Nat Accepted - Accepted Manuscript
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More information

Accepted/In Press date: 3 March 2017
e-pub ahead of print date: June 2017
Published date: 1 September 2017
Organisations: Ocean and Earth Science, Centre for Biological Sciences, Paleooceanography & Palaeoclimate

Identifiers

Local EPrints ID: 406962
URI: https://eprints.soton.ac.uk/id/eprint/406962
ISSN: 0003-0147
PURE UUID: 09d403d8-6a17-47a2-8c89-966378dd856c
ORCID for Thomas H.G. Ezard: ORCID iD orcid.org/0000-0001-8305-6605

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Date deposited: 29 Mar 2017 01:04
Last modified: 15 Aug 2019 04:57

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