PP24B:
Protistan Mixotrophs: Jacks of All Trades or Masters of None? Posters


Session ID#: 9453

Session Description:
Protistan mixotrophs, unicellular eukaryotes that gain energy through a combination of phototrophic and phagotrophic mechanisms, are omnipresent in aquatic ecosystems. They employ a variety of metabolic strategies, from periodic acquisition of photosynthesis by predominantly heterotrophic organisms to occasional grazing by plastidic protists, and make important contributions to biogeochemistry. For example, mixotrophs are bloom-formers in coastal and estuarine ecosystems and act as key nutrient recyclers in oligotrophic gyres. Despite their significance, many aspects of mixotroph physiology and ecology remain unexplored. In this session, we invite investigators to present their research on mixotrophic organisms in both marine and freshwater systems, using laboratory, field, and/or modeling approaches. Studies ranging from cellular processes (e.g., regulation of metabolic machinery) to community ecology (e.g., species interactions) to ecosystem dynamics (e.g., biogeochemical consequences) are welcomed.
Primary Chair:  Holly Moeller, University of California Santa Barbara, Ecology, Evolution & Marine Biology, Santa Barbara, CA, United States
Chairs:  Matthew D Johnson, Woods Hole Oceanographic Institution, Biology Department, Woods Hole, MA, United States and Holly Moeller, University of California Santa Barbara, Ecology, Evolution & Marine Biology, Santa Barbara, CA, United States
Moderators:  Holly Moeller, University of California Santa Barbara, Ecology, Evolution & Marine Biology, Santa Barbara, CA, United States and Matthew D Johnson, Woods Hole Oceanographic Institution, Biology, Woods Hole, MA, United States
Student Paper Review Liaison:  Holly Moeller, University of California Santa Barbara, Ecology, Evolution & Marine Biology, Santa Barbara, CA, United States
Index Terms:

4805 Biogeochemical cycles, processes, and modeling [OCEANOGRAPHY: BIOLOGICAL AND CHEMICAL]
4815 Ecosystems, structure, dynamics, and modeling [OCEANOGRAPHY: BIOLOGICAL AND CHEMICAL]
4840 Microbiology and microbial ecology [OCEANOGRAPHY: BIOLOGICAL AND CHEMICAL]
4858 Population dynamics and ecology [OCEANOGRAPHY: BIOLOGICAL AND CHEMICAL]
Co-Sponsor(s):
  • ME - Marine Ecosystems
  • MM - Microbiology and Molecular Biology

Abstracts Submitted to this Session:

 
PP24B-0555
The marine mixotroph, Mesodinium rubrum is far more than a greenhouse ciliate (87398)
Wonho Yih, Gumog Myung, Hyung-seop Kim, Yeong Doo Yoo and Jung-rae Rho, Kunsan National University
 
PP24B-0556
Mixotrophy in Heterocapsa rotundata: A Mechanism for Dominating the Winter Phytoplankton Community (87644)
Nicole Millette1, James J Pierson1, Alison Aceves2 and Diane Stoecker1, (1)University of Maryland Center for Environmental Science, Horn Point Laboratory, Cambridge, MD, United States, (2)California State University, Monterey Bay, CA, United States
 
PP24B-0557
Acquired phototrophy stabilizes coexistence and shapes intrinsic dynamics in planktonic communities (87875)
Holly Moeller, University of California Santa Barbara, Ecology, Evolution & Marine Biology, Santa Barbara, CA, United States, Elina Peltomaa, University of Helsinki, Department of Environmental Sciences, Helsinki, Finland, Matthew D Johnson, Woods Hole Oceanographic Institution, Biology Department, Woods Hole, MA, United States and Michael Neubert, Woods Hole Oceanographic Institution, Woods Hole, MA, United States
 
PP24B-0558
Kleptoplast Regulation by an Antarctic Dinoflagellate (88280)
Rebecca J Gast, Woods Hole Oceanographic Institution, Biology, Woods Hole, MA, United States, Elisabeth Hehenberger, University of British Columbia, Vancouver, BC and Patrick Keeling, University of British Columbia, Vancouver, BC, Canada
 
PP24B-0559
Bacterivory by a Summer Assemblage of Nanoplankton in the Ross Sea, Antarctica: Mixotrophic Versus Heterotrophic Protists (88843)
Robert W. Sanders, Temple University, Department of Biology, Philadelphia, PA, United States and Rebecca J Gast, Woods Hole Oceanographic Institution, Biology, Woods Hole, MA, United States
 
PP24B-0560
Mixotrophic dinoflagellate Karlodinium veneficum under variable nitrogen:phosphorus stoichiometry: feeding responses and effects on larvae of the eastern oyster (Crassostrea virginica) (89007)
Chihhsien Lin, Graduate Research Assistant (PhD), University of Maryland Center For Environmental Science-Horn Point Laboratory, Cambridge, MD, United States, Stefano Accoroni, PostDoc, Dipartimento di Scienze della Vita e dell’Ambiente, Università Politecnica delle Marche, Ancona, Italy and Patricia M Glibert, University of Maryland Center for Environmental Science, Horn Point Laboratory, Cambridge, MD, United States
 
PP24B-0561
Spatial and Temporal Dynamics of Mixotrophic Protists Within a Protected Glacial Lake (89732)
Sarah Bess DeVaul and Robert W. Sanders, Temple University, Department of Biology, Philadelphia, PA, United States
 
PP24B-0562
Method of Measuring Dinoflagellate Grazing on Flagellate and Bacteria Communities (92322)
Lynn Marrie Blumen, Old Dominion Univ, Norfolk, VA, United States and Margaret R Mulholland, Old Dominion University, Ocean, Earth and Atmospheric Sciences, Norfolk, VA, United States
 
PP24B-0563
Molecular characterization of acquired phototrophs and their plastids in marine communities (93127)
Matthew D Johnson, Woods Hole Oceanographic Institution, Biology Department, Woods Hole, MA, United States, David J. Beaudoin, Woods Hole Oceanographic Institution, Woods Hole, MA, United States and Holly Moeller, University of California Santa Barbara, Ecology, Evolution & Marine Biology, Santa Barbara, CA, United States
See more of: Phytoplankton and Primary Production