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A pleistocene legacy structures variation in modern seagrass ecosystems

Duffy J. Emmett, Stachowicz John J., Reynolds Pamela L., Hovel Kevin A., Jahnke Marlene, Sotka Erik E., Boström Christoffer, Boyer Katharyn E., Cusson Mathieu, Eklöf Johan, Engelen Aschwin H., Eriksson Britas Klemens, Fodrie F. Joel, Griffin John N., Hereu Clara M., Hori Masakazu, Hughes A. Randall, Ivanov Mikhail V., Jorgensen Pablo, Kruschel Claudia, Lee Kun-Seop, Lefcheck Jonathan S., Moksnes Per-Olav, Nakaoka Masahiro, O'Connor Mary I., O’Connor Nessa E., Orth Robert J., Peterson Bradley J., Reiss Henning, Reiss Katrin, Richardson J. Paul, Rossi Francesca, Ruesink Jennifer L., Schultz Stewart T., Thormar Jonas, Tomas Fiona, Unsworth Richard, Voigt Erin, Whalen Matthew A., Ziegler Shelby L. et Olsen Jeanine L.. (2022). A pleistocene legacy structures variation in modern seagrass ecosystems. Proceedings of the National Academy of Sciences, 119, (32), e2121425119.

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URL officielle: http://dx.doi.org/doi:10.1073/pnas.2121425119

Résumé

Distribution of Earth's biomes is structured by the match between climate and plant traits, which in turn shape associated communities and ecosystem processes and services. However, that climate-trait match can be disrupted by historical events, with lasting ecosystem impacts. As Earth's environment changes faster than at any time in human history, critical questions are whether and how organismal traits and ecosystems can adjust to altered conditions. We quantified the relative importance of current environmental forcing versus evolutionary history in shaping the growth form (stature and biomass) and associated community of eelgrass ( Zostera marina ), a widespread foundation plant of marine ecosystems along Northern Hemisphere coastlines, which experienced major shifts in distribution and genetic composition during the Pleistocene. We found that eelgrass stature and biomass retain a legacy of the Pleistocene colonization of the Atlantic from the ancestral Pacific range and of more recent within-basin bottlenecks and genetic differentiation. This evolutionary legacy in turn influences the biomass of associated algae and invertebrates that fuel coastal food webs, with effects comparable to or stronger than effects of current environmental forcing. Such historical lags in phenotypic acclimatization may constrain ecosystem adjustments to rapid anthropogenic climate change, thus altering predictions about the future functioning of ecosystems.

Type de document:Article publié dans une revue avec comité d'évaluation
ISSN:0027-8424
Volume:119
Numéro:32
Pages:e2121425119
Version évaluée par les pairs:Oui
Date:2022
Identifiant unique:10.1073/pnas.2121425119
Sujets:Sciences naturelles et génie > Sciences naturelles > Biologie et autres sciences connexes
Sciences naturelles et génie > Sciences naturelles > Sciences de la terre (géologie, géographie)
Département, module, service et unité de recherche:Unités de recherche > Centre de recherche sur la Boréalie (CREB)
Départements et modules > Département des sciences fondamentales
Mots-clés:biogeography, climate, foundation species, genetic structure
Déposé le:07 févr. 2023 15:18
Dernière modification:18 juill. 2023 18:28
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