Data from: The breakdown of static and evolutionary allometries during climatic upheaval

• Main Authors: Brombacher, Anieke, Wilson, Paul A., Bailey, Ian, Ezard, Thomas H. G.
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2017
• Subjects: Globoconella puncticulata; 2.4 - 2.9 Myr; ocean; Truncorotalia crassaformis; Paleontology; Bolton; Planktonic foraminifera
• Online Access: https://doi.org/10.5061/dryad.8jf2k

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. Shall area and aspect ratio of G. puncticulata and T. crassaformis Shell size and shape of the planktonic foraminifera species Globoconella puncticulata and Truncorotalia crassaformis are presented, with sample ID. Sample age as determined by the age model by Bolton et al., 2010 (Paleoceanography). Data Brombacher et al.xlsx