Positive Feedbacks in Seagrass Ecosystems - Evidence from Large-Scale Empirical Data van der Heide, Tjisse ; van Nes, Egbert H. ; van Katwijk, Marieke M. ; Olff, Han ; Smolders, Alfons J. P. Abstract Publication: PLoS ONE Pub Date: January 2011 DOI: 10.1371/journal.pone.0016504 Bibcode: 2011PLoSO...616504V