[All-postdocs] Biology Seminar this Thursday - Dr. Rosie Alegado, University of Hawai’i

[Margot McKlveen]

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*Biology Department Virtual Seminar*

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Thursday, June 10 at Noon (ET)

Zoom link: 
https://whoi-edu.zoom.us/j/95594699177?pwd=eUNrTDFxckg1WU5FS253ZkRrd1hSZz09 
<https://whoi-edu.zoom.us/j/95594699177?pwd=eUNrTDFxckg1WU5FS253ZkRrd1hSZz09>


Dr. Rosie Alegado

Associate Professor of Oceanography - University of Hawai’i Manoa

Director - Sea Grant Center of Excellence in Integrated Knowledge Systems

Principal Investigator - SOEST Maile Mentoring Bridge Program

Business and Finance Director - JABSOM Tropical Medicine Clinical Laboratory


Resistance and resilience patterns of subtropical island estuarine 
microbial assemblages in response to seasonal forcing

Abstract: Marine microbes exhibit characteristic distributions both 
seasonally and across geomorphological gradients that drive 
biogeochemical cycling, yet we have a poor understanding of how 
large-scale environmental factors facilitate shifts in community 
dynamics. Recycling of nutrients and particulate matter within the 
estuary varies strikingly in response to diurnal, tidal, seasonal and 
climatic forcing. The contributions of factors that co-vary with climate 
change (e.g. pollution, species introduction, variability in 
preciptation and salinity) as these factors may have offsetting roles. A 
number of temperate estuaries have served as systems for studying the 
influences of climate change on the coastal environment, however few 
cognate systems have been thoroughly examined in the tropics. Our 
overarching goal is to understand how climate forcing and human activity 
drive geochemical processes and influence microbial community structure 
and function in tropical coastal estuaries. We performed co-registered 
physical, biogeochemical, and microbial discrete sampling across a 
network of sites within the Heʻeia Fishpond (Hawaiʻi, USA), an 
800-year-old contstructedd estuary that had been impacted by introduced 
mangrove. We hypothesized that Indigenous biocultural restoration 
involving removal of mangrove would improve circulation and distribution 
of terrigenous inputs, increasing the resilience of the water column 
microbial community to disturbance. We found that mangrove removal over 
a 10 year period resulted in decreased residence time and a trend toward 
decreased variation in biogeochemical parameters. The trend toward 
homogeneity resulted in more stable microbial communities that recovered 
after storm events. While the frequency and intensity of tropical 
cyclones is predicted to increase under future climate change scenarios, 
pulses of nutrients and sediment loading led to charcteristic short term 
shifts in microbial community structure. This accessible field site 
enables repeat sampling and robust analyses that will inform us about 
seasonal variation that will enable us to decipher the impact of climate 
on microbially driven geochemical transformations across periods of 
environmental change.


Topic: Virtual Bioseminar

Time: Jun 10, 2021 12:00 PM Eastern Time (US and Canada)


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Meeting ID: 955 9469 9177

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*

-- 
Margot McKlveen | she/her
Senior Administrative Assistant
Woods Hole Oceanographic Institution
Redfield Building Room 305 | MS 32
266 Woods Hole Rd.
Woods Hole, MA 02543
508-289-2334
mmcklveen at whoi.edu

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