Adaptive divergence across Southern Ocean gradients in the pelagic diatom Fragilariopsis kerguelensis

Postel, Ute, Glemser, Barbara, Salazar Alekseyeva, Katherine, Eggers, Sarah Lena, Groth, Marco, Glöckner, Gernot, John, Uwe, Mock, Thomas, Klemm, Kerstin, Valentin, Klaus and Beszteri, Bánk (2020) Adaptive divergence across Southern Ocean gradients in the pelagic diatom Fragilariopsis kerguelensis. Molecular Ecology. ISSN 0962-1083

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Abstract

The Southern Ocean is characterized by longitudinal water circulations crossed by strong latitudinal gradients. How this oceanographic background shapes planktonic populations is largely unknown, despite the significance of this region for global biogeochemical cycles. Here, we show, based on genomic, morphometric, ecophysiological and mating compatibility data, an example of ecotypic differentiation and speciation within an endemic pelagic inhabitant, the diatom Fragilariopsis kerguelensis. We discovered three genotypic variants, one present throughout the latitudinal transect sampled, the others restricted to the north and south, respectively. The latter two showed reciprocal monophyly across all three genomes and significant ecophysiological differences consistent with local adaptation, but produced viable offspring in laboratory crosses. The third group was also reproductively isolated from the latter two. We hypothesize that this pattern originated by an adaptive expansion accompanied by ecotypic divergence, followed by sympatric speciation.

Item Type: Article
Additional Information: © 2020 The Authors. Molecular Ecology published by John Wiley & Sons Ltd.
Uncontrolled Keywords: southern ocean,adaptive divergence,diatom,pelagic,population structure,speciation,ecology, evolution, behavior and systematics,genetics ,/dk/atira/pure/subjectarea/asjc/1100/1105
Faculty \ School: Faculty of Medicine and Health Sciences > Norwich Medical School
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Depositing User: LivePure Connector
Date Deposited: 13 Aug 2020 23:59
Last Modified: 22 Sep 2020 00:04
URI: https://ueaeprints.uea.ac.uk/id/eprint/76442
DOI: 10.1111/mec.15554

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