Supplementary Material: Predictability of intraspecific size variation in extant planktonic foraminifera

Planktonic foraminifera (PF) size varies greatly both among and within species. This variation affects our understanding of PF ecology and evolution as well as reconstructions of the ocean-climate system. It is currently accepted that PF species are largest under optimum environmental conditions, where abundance is maximised. This idea is based on observations from marine sediment assemblages; however, these observations either had limited intraspecific resolution or focused on a restricted part of each species’ biogeographical range. Here we compile a new global PF shell size dataset to investigate the relationship between intraspecific size variation and abundance and sea surface temperature (SST). Our dataset contains 3817 individual size measurements on nine PF species in 53 surface sediments around the world. For each species, we fitted a generalised linear model of population shell size as function of local abundance (as an indicator of optimum environmental conditions) and SST. We support previous results that species maximum size and maximum abundance rank along SST; however, this relationship is not supported within species. Only two species out of nine revealed a significant positive relationship between size and abundance, suggesting shell size is not maximised at the species environmental optimum. SST significantly explained variation in shell size for four species out of nine. By incorporating intraspecific variation and sampling broader geographical ranges compared to previous studies, we conclude that the relationships between PF shell size and abundance or SST are either absent or weaker than previously reported.

Related materials:

(preprint) Marina C. Rillo, C. Giles Miller, M Kucera and THG Ezard (2018) Predictability of intraspecific size variation in extant planktonic foraminifera. bioRxiv 468165; doi: https://doi.org/10.1101/468165

Marina Costa Rillo (2016). Dataset: Henry Buckley Collection of Planktonic Foraminifera. Natural History Museum Data Portal (data.nhm.ac.uk). https://doi.org/10.5519/0035055

Marina C. Rillo, John Whittaker, Thomas H. G. Ezard, Andy Purvis, Andrew S. Henderson, Stephen Stukins, C. Giles Miller, The unknown planktonic foraminiferal pioneer Henry A. Buckley and his collection at The Natural History Museum, London. Journal of Micropalaeontology, 36(2), 191-194. doi: https://doi.org/10.1144/jmpaleo2016-020

Marina C. Rillo, M Kucera, THG Ezard and C. Giles Miller, (2019) Surface Sediment Samples From Early Age of Seafloor Exploration Can Provide a Late 19th Century Baseline of the Marine Environment. Front. Mar. Sci. 5:517; doi: https://doi.org/10.3389/fmars.2018.00517

Data and Resources

Cite this as

Marina Costa Rillo, C. Giles Miller, Michal Kucera, Thomas H. G. Ezard (2019). Dataset: Supplementary Material: Predictability of intraspecific size variation in extant planktonic foraminifera. Natural History Museum Data Portal (data.nhm.ac.uk). https://doi.org/10.5519/0056541

Retrieved: 01:00 25 May 2019 (GMT)

Additional Info

Field Value
Author(s) Marina Costa Rillo, C. Giles Miller, Michal Kucera, Thomas H. G. Ezard
Affiliation Ocean and Earth Science, National Oceanography Centre Southampton, University of Southampton, Southampton, United Kingdom; Department of Earth Sciences, Natural History Museum, London, United Kingdom; MARUM Center for Marine Environmental Sciences, University of Bremen, Bremen, Germany
Temporal extent Holocene
Update frequency Annual
Dataset category Research
Last updated April 29, 2019
Last resource update April 29, 2019 (size_data_bias_analysis)
Created April 29, 2019
License Creative Commons Attribution Share-Alike