All data and metadata to be archived at the U.S. National Science Foundation Biological and Chemical Oceanography Data Management Office (BCO-DMO, http://bcodmo.org/).
SHORT- VERSUS LONG-TERM RESPONSES TO CHANGING CO2 IN A COASTAL DINOFLAGELLATE BLOOM: IMPLICATIONS FOR INTERSPECIFIC COMPETITIVE INTERACTIONS AND COMMUNITY STRUCTURE
Version of Record online: 4 JAN 2013
© 2013 The Author(s). Evolution © 2013 The Society for the Study of Evolution.
Volume 67, Issue 7, pages 1879–1891, July 2013
How to Cite
Tatters, A. O., Schnetzer, A., Fu, F., Lie, A. Y.A., Caron, D. A. and Hutchins, D. A. (2013), SHORT- VERSUS LONG-TERM RESPONSES TO CHANGING CO2 IN A COASTAL DINOFLAGELLATE BLOOM: IMPLICATIONS FOR INTERSPECIFIC COMPETITIVE INTERACTIONS AND COMMUNITY STRUCTURE. Evolution, 67: 1879–1891. doi: 10.1111/evo.12029
- Issue online: 1 JUL 2013
- Version of Record online: 4 JAN 2013
- Accepted manuscript online: 11 DEC 2012 02:21PM EST
- Manuscript Accepted: 12 NOV 2012
- Manuscript Received: 24 JUL 2012
- NSF. Grant Number: OCE-0962309
- artificial community;
- climate change;
- dinoflagellate community;
- ocean acidification
Increasing pCO2 (partial pressure of CO2) in an “acidified” ocean will affect phytoplankton community structure, but manipulation experiments with assemblages briefly acclimated to simulated future conditions may not accurately predict the long-term evolutionary shifts that could affect inter-specific competitive success. We assessed community structure changes in a natural mixed dinoflagellate bloom incubated at three pCO2 levels (230, 433, and 765 ppm) in a short-term experiment (2 weeks). The four dominant species were then isolated from each treatment into clonal cultures, and maintained at all three pCO2 levels for approximately 1 year. Periodically (4, 8, and 12 months), these pCO2-conditioned clones were recombined into artificial communities, and allowed to compete at their conditioning pCO2 level or at higher and lower levels. The dominant species in these artificial communities of CO2-conditioned clones differed from those in the original short-term experiment, but individual species relative abundance trends across pCO2 treatments were often similar. Specific growth rates showed no strong evidence for fitness increases attributable to conditioning pCO2 level. Although pCO2 significantly structured our experimental communities, conditioning time and biotic interactions like mixotrophy also had major roles in determining competitive outcomes. New methods of carrying out extended mixed species experiments are needed to accurately predict future long-term phytoplankton community responses to changing pCO2.