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Latitude, temperature and habitat complexity predict predation pressure in eelgrass beds across the Northern Hemisphere

Reynolds Pamela L., Stachowicz John J., Hovel Kevin, Boström Christoffer, Boyer Katharyn, Cusson Mathieu, Eklöf Johan S., Engel Friederike G., Engelen Aschwin H., Eriksson Britas Klemens, Fodrie F.Joel, Griffin John N., Hereu Clara, Hori Masakazu, Hanley Torrance, Ivanov Mikhail, Jorgensen Pablo, Kruschel Claudia, Lee Kun-Seop, McGlathery Karen, Moksnes Per Olav, Nakaoka Masahiro, O'Connor Mary I., O'Connor Nessa, Orth Robert J., Rossi Francesca, Ruesink Jennifer, Sotka Erik, Tomas Fiona, Unsworth Richard K.F., Whalen Matthew A. et Duffy J. Emmett. (2018). Latitude, temperature and habitat complexity predict predation pressure in eelgrass beds across the Northern Hemisphere. Ecology, 99, (1), p. 29-35.

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URL officielle: http://dx.doi.org/doi:10.1002/ecy.2064

Résumé

Latitudinal gradients in species interactions are widely cited as potential causes or consequences of global patterns of biodiversity. However, mechanistic studies documenting changes in interactions across broad geographic ranges are limited. We surveyed predation intensity on common prey (live amphipods and gastropods) in communities of eelgrass (Zostera marina) at 48 sites across its Northern Hemisphere range, encompassing over 37° of latitude and four continental coastlines. Predation on amphipods declined with latitude on all coasts but declined more strongly along western ocean margins where temperature gradients are steeper. Whereas in situ water temperature at the time of the experiments was uncorrelated with predation, mean annual temperature strongly positively predicted predation, suggesting a more complex mechanism than simply increased metabolic activity at the time of predation. This large-scale biogeographic pattern was modified by local habitat characteristics; predation declined with higher shoot density both among and within sites. Predation rates on gastropods, by contrast, were uniformly low and varied little among sites. The high replication and geographic extent of our study not only provides additional evidence to support biogeographic variation in predation intensity, but also insight into the mechanisms that relate temperature and biogeographic gradients in species interactions.

Type de document:Article publié dans une revue avec comité d'évaluation
ISSN:00129658
Volume:99
Numéro:1
Pages:p. 29-35
Version évaluée par les pairs:Oui
Date:2018
Identifiant unique:10.1002/ecy.2064
Sujets:Sciences naturelles et génie > Sciences appliquées > Eau et environnement
Sciences naturelles et génie > Sciences naturelles > Biologie et autres sciences connexes
Département, module, service et unité de recherche:Départements et modules > Département des sciences fondamentales
Mots-clés:biogeography, latitude, mesograzer, predation, seagrass, species interactions, temperature, Zostera, biogéographie, herbier, intéractions entre espèces, température, Zostère
Déposé le:11 janv. 2018 15:49
Dernière modification:07 mars 2018 03:11
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