Post on 20-Dec-2015
Ecology of free-living Symbiodinium
Misaki Takabayashi, PhD
Lisa Adams (Master’s Candidate)Marine Science Department
University of Hawai`i at Hilo
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Research at UH-Hilo
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Photographs by John Oshima, UHH Graphics
Research at UH-Hilo• Facilities and equipment improvements with
EPSCoR (NSF) other funds since 2002
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Research at UH-Hilo• Master’s program: Tropical Conservation
Biology and Environmental Sciences
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Lisa AdamsSea Grant Graduate Fellow
Ecology of Free-living Symbiodinium
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85% of symbiotic invertebrates must acquire Symbiodinium from the environment
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Fish Feces
Sediment
Water column
Released from corals
Free-living “Symbiodinium”
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1. Are free-living Symbiodinium present in water column and marine sediments?
2. What is the diversity of Symbiodinium in these populations?
3. Are these populations viable, accessible, and utilized by asymbiotic invertebrates?
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1. Are free-living Symbiodinium present in water column and marine sediments?
• Yes
• Coffroth et al. 2006 (sediment Florida Keys)• Manning and Gates in review (Hawaii)
2. What is the diversity of Symbiodinium in these populations?
In Progress with collaborators…
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2. What is the diversity of Symbiodinium in these populations?
MHI Okinawa
NWHI Australia
Florida
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3. Are these populations viable, accessible, and utilized by asymbiotic invertebrates?
• Needed asymbiotic coral larvae
• All Hawaiian corals have zooxanthellate larvae
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But Okinawa has asymbiotic coral larvae!
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Univ. of Ryukyus, OkinawaCOE Summer Program
NSF East Asia Pacific Summer Institute Graduate Fellowship for Lisa Adams
Preferential Uptake of Symbiodinium from Sediment and Water Column
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Asymbiotic larvae of Acropora monticulosa
SW
Sed
Filtered Non filtered
No
Sediment
Control
FSW
SW
Sediment FSW&Sed SW&Sed
Larvae infected with Symbiodinium earlier and in greater proportions in sediment containing treatments than SW only
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Symbiodinium density higher in sediment containing treatments than SW only
3. Are these populations viable, accessible, and utilized by asymbiotic invertebrates?
Conclusions:• Symbiodinium in both SW and sediment are
viable.• Symbiodinium in sediment infect more A.
monticulosa larvae and earlier than those in water column.
• Adams, Cumbo, Takabayashi in prep.
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Hawaii Tribune Herald front page April 29th, 2007
Ocean Day, HawaiiPacific Aquaculture and Coastal Resources Center
Image by Cody Chapin
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Student Training
Collaborations
• Drs. Ruth Gates and Xavier Pichon (Edwin Pauley Workshop, HIMB)
• Dr. Selina Ward (University of Queensland)• University of the Ryukyus (COE Summer
Prog)
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