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Article Dans Une Revue Proceedings of the National Academy of Sciences of the United States of America Année : 2022

A Pleistocene legacy structures variation in modern seagrass ecosystems

J. Emmett Duffy
John Stachowicz
Pamela Reynolds
  • Fonction : Auteur
Marlene Jahnke
  • Fonction : Auteur
Erik Sotka
Katharyn Boyer
Mathieu Cusson
Johan Eklöf
  • Fonction : Auteur
Aschwin Engelen
F. Joel Fodrie
Clara Hereu
Masakazu Hori
  • Fonction : Auteur
A. Randall Hughes
Mikhail Ivanov
Pablo Jorgensen
Claudia Kruschel
  • Fonction : Auteur
Kun-Seop Lee
Jonathan Lefcheck
Per-Olav Moksnes
  • Fonction : Auteur
Masahiro Nakaoka
Mary O’connor
Nessa O’connor
Robert Orth
Bradley Peterson
  • Fonction : Auteur
Henning Reiss
  • Fonction : Auteur
Katrin Reiss
  • Fonction : Auteur
J. Paul Richardson
  • Fonction : Auteur
Jennifer Ruesink
  • Fonction : Auteur
Stewart Schultz
  • Fonction : Auteur
Jonas Thormar
Fiona Tomas
  • Fonction : Auteur
Richard Unsworth
Erin Voigt
  • Fonction : Auteur
Matthew Whalen
  • Fonction : Auteur
Shelby Ziegler
Jeanine Olsen
  • Fonction : Auteur

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.
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Dates et versions

hal-03854247 , version 1 (16-11-2022)

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J. Emmett Duffy, John Stachowicz, Pamela Reynolds, Kevin Hovel, Marlene Jahnke, et al.. A Pleistocene legacy structures variation in modern seagrass ecosystems. Proceedings of the National Academy of Sciences of the United States of America, 2022, 119 (32), ⟨10.1073/pnas.2121425119⟩. ⟨hal-03854247⟩
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