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Diatom biogeography from the Labrador Sea revealed through a trait-based approach

Diatom biogeography from the Labrador Sea revealed through a trait-based approach
Diatom biogeography from the Labrador Sea revealed through a trait-based approach
Diatoms are a keystone algal group, with diverse cell morphology and a global distribution. The biogeography of morphological, functional and life-history traits of marine diatoms were investigated in Arctic and Atlantic waters of the Labrador Sea during the spring bloom (2013-2014). In this study, trait-based analysis using community-weighted means showed that low temperatures (<0ºC) in Arctic waters correlated positively with diatom species that have traits such as low temperature optimum growth and the ability to produced ice-binding proteins, highlighting their sea-ice origin. High silicate concentrations in Arctic waters, as well as sea-ice cover and shallow bathymetry, favoured diatom species that were heavily silicified, colonial and capable of producing resting spores, suggesting that these are important traits for this community. In Atlantic waters, diatom species with large surface area to volume ratios were dominant in deep mixed layers, whilst low silicate to nitrate ratios correlated positively with weakly silicified species. Sharp cell projections, such as processes or spines, were positively correlated with water-column stratification, indicating that these traits promote positive buoyancy for diatom cells. Our trait-based analysis directly links cell morphology and physiology with diatom species distribution, highlighting allowing new insights on how this method can potentially be applied to explain ecophysiology and shifting biogeographical distributions in a warming climate
Arctic, Atlantic, Marine diatom, Trait-based approaches, biogeography
2296-7745
1-15
Fragoso, Glaucia
406a23cd-79a7-430b-9dc5-9b98676b7f0f
Poulton, Alex
14bf64a7-d617-4913-b882-e8495543e717
Yashayaev, Igor M.
8b15c3c3-4f86-465b-ac7d-b8bc525c61d0
Head, Erica J.H.
b1eddcbe-b644-4ef0-a113-ab92f16860cd
Johnsen, Geir
5bf64ca2-09e5-4a16-a327-f37bd41592a1
Purdie, Duncan A.
18820b32-185a-467a-8019-01f245191cd8
Fragoso, Glaucia
406a23cd-79a7-430b-9dc5-9b98676b7f0f
Poulton, Alex
14bf64a7-d617-4913-b882-e8495543e717
Yashayaev, Igor M.
8b15c3c3-4f86-465b-ac7d-b8bc525c61d0
Head, Erica J.H.
b1eddcbe-b644-4ef0-a113-ab92f16860cd
Johnsen, Geir
5bf64ca2-09e5-4a16-a327-f37bd41592a1
Purdie, Duncan A.
18820b32-185a-467a-8019-01f245191cd8

Fragoso, Glaucia, Poulton, Alex, Yashayaev, Igor M., Head, Erica J.H., Johnsen, Geir and Purdie, Duncan A. (2018) Diatom biogeography from the Labrador Sea revealed through a trait-based approach. Frontiers in Marine Science, 5 (297), 1-15. (doi:10.3389/fmars.2018.00297).

Record type: Article

Abstract

Diatoms are a keystone algal group, with diverse cell morphology and a global distribution. The biogeography of morphological, functional and life-history traits of marine diatoms were investigated in Arctic and Atlantic waters of the Labrador Sea during the spring bloom (2013-2014). In this study, trait-based analysis using community-weighted means showed that low temperatures (<0ºC) in Arctic waters correlated positively with diatom species that have traits such as low temperature optimum growth and the ability to produced ice-binding proteins, highlighting their sea-ice origin. High silicate concentrations in Arctic waters, as well as sea-ice cover and shallow bathymetry, favoured diatom species that were heavily silicified, colonial and capable of producing resting spores, suggesting that these are important traits for this community. In Atlantic waters, diatom species with large surface area to volume ratios were dominant in deep mixed layers, whilst low silicate to nitrate ratios correlated positively with weakly silicified species. Sharp cell projections, such as processes or spines, were positively correlated with water-column stratification, indicating that these traits promote positive buoyancy for diatom cells. Our trait-based analysis directly links cell morphology and physiology with diatom species distribution, highlighting allowing new insights on how this method can potentially be applied to explain ecophysiology and shifting biogeographical distributions in a warming climate

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Accepted/In Press date: 6 August 2018
e-pub ahead of print date: 5 September 2018
Keywords: Arctic, Atlantic, Marine diatom, Trait-based approaches, biogeography

Identifiers

Local EPrints ID: 422949
URI: https://eprints.soton.ac.uk/id/eprint/422949
ISSN: 2296-7745
PURE UUID: 71913170-72b6-4f63-969c-aa1e4465fa77

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Date deposited: 08 Aug 2018 16:30
Last modified: 13 Mar 2019 18:12

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