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Regional-Scale Differences in Eutrophication Effects on Eelgrass-Associated (Zostera marina) Macrofauna

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Abstract

Eutrophication has caused strong shifts from perennial seagrass to opportunistic macroalgae and phytoplankton in many coastal ecosystems worldwide, yet responses of the primary-producer assemblage can vary with regional environmental and nutrient-loading conditions. The wider consequences of this variable primary-producer response on the associated animal community are little known. We used large-scale field surveys across 12 study sites with low or high eutrophication levels in two geographic provinces in Atlantic Canada to examine region-specific responses of macrofauna associated with eelgrass beds. In both regions, abundances of all groups increased with eutrophication, but species richness of mobile fishes and invertebrates decreased. Generally, filter feeders, epibenthic detritivores and some herbivores increased, while more hypoxia sensitive species declined. Small fishes and invertebrate predators increased with eutrophication mirrored by decreases in their prey. Despite similar general trends, our results show distinct shifts in species composition in each geographic region associated with differences in food availability and predation refuge offered by phytoplankton and opportunistic epiphytic or benthic macroalgae as well as tolerance to an increasingly hostile physico-chemical environment. So far, the continued persistence of eelgrass beds at our “highly” eutrophied sites indicates intermediate eutrophication levels with short-term benefits for some species. However, the loss of sensitive species and decrease in species richness highlight that eutrophication has already changed seagrass ecosystems in Atlantic Canada. Our work suggests that mitigating these changes will require regional-scale management.

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Acknowledgements

We thank A. Battersby, K. Varsava and Kouchibouguac National Park for field support, R. Scheibling for a critical review of the manuscript and D. Ibarra for intellectual and artistic input on Fig. 6. Our sincerest thanks to all those who hosted us or granted us access to our study sites in NB and PEI. This work was funded by a National Science and Engineering Research Council (NSERC) Discovery grant to HKL, a NSERC Post-Graduate Doctoral Scholarship and Killam Trust Predoctoral Scholarship to ALS, and postdoctoral fellowships from the Spanish Ministry of Science and Technology and the European Community Marie-Curie Program through the International Outgoing Fellowships to MC.

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Correspondence to Allison L. Schmidt.

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Communicated by Masahiro Nakaoka

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Appendix

Table 5 Minimum length at maturity data for species observed in eelgrass beds in Atlantic Canada

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Schmidt, A.L., Coll, M. & Lotze, H.K. Regional-Scale Differences in Eutrophication Effects on Eelgrass-Associated (Zostera marina) Macrofauna. Estuaries and Coasts 40, 1096–1112 (2017). https://doi.org/10.1007/s12237-016-0204-z

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