Signatures of nutrient limitation and co-limitation: responses of autotroph internal nutrient concentrations to nitrogen and phosphorus additions

M. E. S. Bracken ([email protected]), Dept of Ecology and Evolutionary Biology, Univ. of California, Irvine, CA 93923-2525, USA. – H. Hillebrand, Inst. for Chemistry and Biology of the Marine Environment (ICBM), Carl-von-Ossietzky Univ. Oldenburg, Schleusenstrasse 1, DE-26382 Wilhelmshaven, Germany. – E. T. Borer and E. W. Seabloom, Dept of Ecology, Evolution and Behavior, Univ. of Minnesota, Minneapolis, MN 55108, USA. – J. Cebrian, Dauphin Island Sea Lab, Dauphin Island, AL 36528, USA, and: Dept of Marine Sciences, Univ. of South Alabama, Mobile, AL 36688, USA. – E. E. Cleland, Section of Ecology, Behavior and Evolution, Univ. of California – San Diego, La Jolla, CA 92093-0116, USA – J. J. Elser, School of Life Sciences, Arizona State Univ., Tempe, AZ 85287, USA. – D. S. Gruner, Dept of Entomology, Univ. of Maryland, College Park, MD 20742-4454, USA. – W. S. Harpole, Dept of Ecology, Evolution and Organismal Biology, Iowa State Univ., Ames, IA 50011, USA. – J. T. Ngai, Dept of Zoology, Univ. of British Columbia, 6270 University Boulevard, Vancouver, BC, V6T 1Z4, Canada. – J. E. Smith, Center for Marine Biodiversity and Conservation, Scripps Inst. of Oceanography, Univ. of California – San Diego, La Jolla, CA 92093-0202, USA.