Oceanography Seminar

November 21, 3:00pm - 4:15pm
Mānoa Campus, MSB 100

Craig Nelson
Assistant Researcher
Department of Oceanography, UH Sea Grant, and C-MORE

“Interactions between microbes and dissolved organic matter in tropical reefs: What role might bacterioplankton play in ecosystem trajectories?”

Abstract: While emerging global-scale trends in ocean chemistry and physics loom large over all marine ecosystems, coral reefs worldwide have already exhibited striking changes in the last century. Increasing abundance of benthic algae and concomitant declines in coral cover are perhaps the most widespread and tangible evidence of reef "degradation" associated with human activies and population growth. However, the fundamental changes to ecosystem biogeochemistry and metabolism on degraded reefs lie in the world of microbes: Human-impacted coastal habitats exhibit characteristic shifts in the size, abundance, and community structure of microbes, and there is compelling experimental evidence suggesting that the spread of algae may facilitate reef degradation through changes to interactions between microbes and their dissolved organic matter resources.

Bacterioplankton (planktonic single-celled Bacteria and Archaea) are now widely recognized as major contributors to pelagic food webs and as a significant fraction of the diversity and productivity of the global ocean, but their role in coastal habitats is poorly understood. These organisms are the primary conduit for recycling the vast, complex pool of dissolved organic matter (DOM) in the oceans; DOM-microbe interactions in reef environments may be central to understanding how reefs are changing now and how they will adapt in the future. This talk will present our current understanding of the types of bacterioplankton in reefs, the biogeochemistry of DOM in reefs, and how the composition of the benthic macroorganismal community may influence microbial dynamics and reef metabolism.

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Oceanography, Mānoa Campus

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Thursday, November 21

7:30am Maui Campus, Pilina Bldg., Wellness Center
9:00am Mānoa Campus, Saunders 617
9:00am Mānoa Campus, WIST 130
11:00am Honolulu Campus, 874 Dillingham Blvd
12:00pm Mānoa Campus, Moore Hall 258
1:30pm Mānoa Campus, Orvis Auditorium
2:30pm Honolulu Campus, Bulding 2 Floor 1 Student Lounge
3:00pm Mānoa Campus, POST 126
3:00pm Maui Campus, UHMC Great Lawn
3:00pm Mānoa Campus, POST 723
3:00pm Mānoa Campus, MSB 100
4:00pm Mānoa Campus, Art Auditorium
4:30pm Mānoa Campus, Wist Hall 133 (CCC)
5:00pm Mānoa Campus, Campus Center room 308
6:00pm Mānoa Campus, Hale Aloha Courtyard- 2571 Dole St