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

Artikel i vetenskaplig tidskrift
Författare P. Reynolds
JJ. Stachowicz
K. Hovel
C. Boström
Boyer K.
K. Cusson
J. Eklöf
JS. Engel
AH. Engelen
BK. Eriksson
J Fodrie
JN Griffin
C. Hereu
M. Hori
M. Hanley
M. Ivanov
P. Jorgensen
C. Kruschel
K-S. Lee
K. McGathery
Per-Olav Moksnes
Masahiro Nakaoka
FT. Nash
MI. O’Connor
N. O’Connor
RJ. Orth
F. Rossi
J. Ruesink
E. Sotka
J. Thormar
MI. Unsworth
MA. Whalen
JE. Duffy
Publicerad i Ecology
Volym 99
Nummer/häfte 1
Sidor 29-35
ISSN 0012-9658
Publiceringsår 2018
Publicerad vid Institutionen för marina vetenskaper
Sidor 29-35
Språk en
Länkar dx.doi.org/10.1002/ecy.2064
Ämnesord biogeography, latitude, Zostera, seagrass, species interactions, predation, temperature, mesograzer
Ämneskategorier Marin ekologi

Sammanfattning

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 370 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 simple 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 intensity, but also insight into the mechanisms that relate temperature and biogeographic gradients in species interactions.

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