Supplementary Material: Intraspecific size variation in planktonic foraminifera cannot be consistently predicted by the environment

Global studies on the size structure of plankton communities have so far mostly focused on assemblages. Few studies have quantified how organism size varies within species across space. Using a recently-digitised museum collection, we investigate how planktonic foraminifera species vary in size across the tropical and subtropical oceans of the world. We measured 3,799 individuals of nine species in 53 seafloor sediments and analysed potential size biases in the museum collection. For each site, we obtained corresponding local values of mean annual sea-surface temperature (SST), net primary productivity (NPP), and relative abundance of each species. Given former studies, we expected species to reach largest shell sizes under optimal environmental conditions. In contrast, we observe that species greatly differ in how much size variation is explained by SST, NPP and/or relative abundance. While some species show a high predictability of size variation given one single variable (Trilobatus sacculifer, Globigerinella siphonifera, Pulleniatina obliquiloculata, Globorotalia truncatulinoides), other species showed either weak or no relationships between size and the studied covariates (Globigerinoides ruber, G. conglobatus, Neogloboquadrina dutertrei, G. menardii, Globoconella inflata). By incorporating intraspecific variation and sampling broader geographical ranges compared to previous studies, we conclude that shell size variation in planktonic foraminifera species cannot be consistently predicted by the environment. Our results caution against the general use of size as a proxy for planktonic foraminifera environmental optima, and emphasise the need for more studies analysing within-species variation. More generally, our findings highlight the utility of natural history collections and the importance of considering intraspecific variation when analysing macroecological patterns.

Related materials:

(under review) Marina C. Rillo, C. Giles Miller, M Kucera and THG Ezard (2020) Intraspecific size variation in planktonic foraminifera cannot be consistently predicted by the environment. bioRxiv 468165; DOI: https://doi.org/10.1101/468165

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. Frontiers in Marine Science 5:517; DOI: https://doi.org/10.3389/fmars.2018.00517

Marina C. Rillo, J. Whittaker, THG Ezard, A. Purvis, A.S. Henderson, S. Stukins & C.G. Miller, (2016) The unknown planktonic foraminiferal pioneer Henry A. Buckley and his collection at the Natural History Museum, London, Journal of Micropalaeontology, 36, 191-194, DOI: https://doi.org/10.1144/jmpaleo2016-020

Giles Miller (2018). Dataset: Ocean Bottom Deposits Collection. Natural History Museum Data Portal (data.nhm.ac.uk). DOI: https://doi.org/10.5519/0096416

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

Data and Resources

Cite this as

Marina Costa Rillo, C. Giles Miller, Michal Kucera, Thomas H. G. Ezard (2019). Dataset: Supplementary Material: Intraspecific size variation in planktonic foraminifera cannot be consistently predicted by the environment. Natural History Museum Data Portal (data.nhm.ac.uk). https://doi.org/10.5519/0056541

Retrieved: 08:55 23 Sep 2020 (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
Contributors MR is funded by the Graduate School of the National Oceanography Centre Southampton and DAAD Research Grants for Doctoral Candidates 2016/17 (no. 57210260). TE is funded by NERC Advanced Research Fellowship NE/J018163/1.
Temporal extent Holocene
Update frequency Never
Last updated September 22, 2020
Last resource update September 22, 2020 (Rillo_foram_size_code.R)
Created April 29, 2019
License Creative Commons Attribution Share-Alike