Journal
AMERICAN NATURALIST
Volume 190, Issue 3, Pages 350-362Publisher
UNIV CHICAGO PRESS
DOI: 10.1086/692570
Keywords
microevolution; trait covariance; extinction; dwarfism; planktonic foraminifera
Categories
Funding
- Natural Environment Research Council Advanced Research Fellowship [NE/J018163/1]
- US National Science Foundation
- NERC [NE/J018163/1] Funding Source: UKRI
Ask authors/readers for more resources
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 500,000 years. Our study 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. 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.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available