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Oecologia

, Volume 175, Issue 2, pp 667–676 | Cite as

Nitrogen availability limits phosphorus uptake in an intertidal macroalga

  • Valerie PeriniEmail author
  • Matthew E. S. Bracken
Ecosystem ecology - Original research

Abstract

Nutrients such as nitrogen (N) and phosphorus (P) limit primary productivity, and recent anthropogenic activities are changing the availability of these nutrients, leading to alterations in the type and magnitude of nutrient limitation. Recent work highlights the potential for N and P to interact to limit primary production in terrestrial and freshwater systems. However, mechanisms underlying co-limitation are not well described. Documentation of ambient nutrient levels and tissue nutrients of the intertidal macroalga Fucus vesiculosus for 2 years in the southern Gulf of Maine, USA, indicates that N availability may be impacting the ability of F. vesiculosus to access P, despite relatively high ambient P concentrations. To experimentally validate these observations, F. vesiculosus individuals were enriched with N or P for 6 weeks, followed by an uptake experiment to examine how the interactions between these nutrients affected macroalgal N and P uptake efficiency. Results illustrate that exposure of seaweed to different nutrient regimes influenced nutrient uptake efficiency. Notably, seaweeds enriched with N displayed the highest P uptake efficiency at low, biologically relevant, P concentrations. Our results confirm that N availability may be mediating the ability of primary producers to access P. These interactions between limiting nutrients have implications for not only the growth and functioning of primary producers who rely directly on these nutrients but also the entire communities that they support.

Keywords

Co-limitation Fucus vesiculosus Nutrient limitation Nutrient uptake Stoichiometry 

Notes

Acknowledgments

We thank C. Aguila, K. Benes, J. Douglass, B. Gillis, L. Henry, H. McInerney, I. Rosenthal, A. Saco, and B. Taggart for help with water sampling, seaweed collection, assistance with experiments, and/or tissue sample preparation for elemental analysis. D. Cheney, C. Thornber, and two anonymous reviewers provided valuable feedback on earlier versions of the manuscript. This work was funded by the National Science Foundation (OCE 0961364 to M.E.S.B. and G. Trussell and 0963010 to G. Trussell et al. as part of the Academic Research Infrastructure Recovery and Reinvestment Program). The research described here was completed as part of the requirements for a Master’s degree in Biology at Northeastern University, and this manuscript is contribution number 307 of the Marine Science Center, Northeastern University.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  1. 1.Marine Science CenterNortheastern UniversityNahantUSA
  2. 2.Department of Ecology and Evolutionary BiologyUniversity of CaliforniaIrvineUSA

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