Abstract
Small changes in environmental conditions can unexpectedly tip an ecosystem from one community type to another, and these often irreversible shifts have been observed in semi-arid grasslands, freshwater lakes and ponds, coral reefs, and kelp forests. A commonly accepted explanation is that these ecosystems contain multiple stable points, but experimental tests confirming multiple stable states have proven elusive. Here we present a novel approach and show that mussel beds and rockweed stands are multiple stable states on intertidal shores in the Gulf of Maine, USA. Using broad-scale observational data and long-term data from experimental clearings, we show that the removal of rockweed by winter ice scour can tip persistent rockweed stands to mussel beds. The observational data were analyzed with Anderson’s discriminant analysis of principal coordinates, which provided an objective function to separate mussel beds from rockweed stands. The function was then applied to 55 experimental plots, which had been established in rockweed stands in 1996. Based on 2005 data, all uncleared controls and all but one of the small clearings were classified as rockweed stands; 37% of the large clearings were classified as mussel beds. Our results address the establishment of mussels versus rockweeds and complement rather than refute the current paradigm that mussel beds and rockweed stands, once established, are maintained by site-specific differences in strong consumer control.
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Acknowledgements
We thank M. J. Anderson who provided the CAP and PREDICTION programs as freeware, and B. Boldgiv, J. C. Castilla, and J. A. D. Fisher who read and commented on earlier drafts of the manuscript. We are also grateful for the support of this research by the residents of Swan’s Island who provided access to the shore across their properties. Research was supported by National Science Foundation awards to P. S. Petraitis (OCE 95-29564 and DEB LTREB 03-14980) and by a RET award to E. C. Rhile (Research Experiences for Teachers supplemental to DEB LTREB 03-14980). S. R. Dudgeon was supported by the National Institutes of Health GMS-MBRS-SCORE program (NIH-5SO6GM48680) during the writing of the manuscript. Earlier drafts were written while Petraitis was a Fulbright Scholar in Chile, and he is deeply grateful to the Comisión Fulbright Chile, the Departamento de Ecología, Pontificia Universidad Católica de Chile, and J. C. Castilla for their support and hospitality.
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Communicated by Pete Peterson.
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Petraitis, P.S., Methratta, E.T., Rhile, E.C. et al. Experimental confirmation of multiple community states in a marine ecosystem. Oecologia 161, 139–148 (2009). https://doi.org/10.1007/s00442-009-1350-9
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DOI: https://doi.org/10.1007/s00442-009-1350-9