Patterns of trait convergence and divergence among native and exotic species in herbaceous plant communities are not modified by nitrogen enrichment

Elsa E. Cleland*, Chris M. Clark, Scott L. Collins, Joseph E. Fargione, Laura Gough, Katherine L. Gross, Steven C. Pennings and Katharine N. Suding Ecology, Behavior & Evolution Section, University of California, San Diego, CA 92093, USA; School of Life Sciences, Arizona State University, Tempe, AZ 85287, USA; Department of Biology, University of New Mexico, Albuquerque, NM 87131, USA; The Nature Conservancy, North America Region, Minneapolis, MN 55415, USA; Department of Biology, University of Texas at Arlington, Arlington, TX 76019, USA; W.K. Kellogg Biological Station and Department of Plant Biology, Michigan State University, Hickory Corners, MI 49060, USA; Department of Biology and Biochemistry, University of Houston, Houston, TX 77204, USA; and Department of Environmental Science, Policy, and Management, University of California, Berkeley, CA 94720, USA