[All-postdocs] Biology Seminar next Thursday: Joint Program students Jane Weinstock and Jordan Pitt

[Margot McKlveen]

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*Biology Department Virtual Seminar*

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Thursday, September 2 at Noon

Zoom link: 
https://whoi-edu.zoom.us/j/94122732384?pwd=ZEhqZXZyeDdhMXVVR3d1dmFkYmZIQT09 
<https://whoi-edu.zoom.us/j/94122732384?pwd=ZEhqZXZyeDdhMXVVR3d1dmFkYmZIQT09>


MIT-WHOI Joint Program students

Jane Weinstock: Seasonal and lunar cycles in timing of barnacle 
reproduction and settlement

Jordan Pitt:Do Microplastics Accumulate in Food Webs?


Jane Weinstock- Seasonal and lunar cycles in timing of barnacle 
reproduction and settlement

The timing of life history events (phenology) can have profound 
implications for populations and communities, especially those events 
that influence species dispersal and recruitment. In benthic 
invertebrates, the majority of dispersal occurs during the larval phase, 
during which time larvae are transported by currents as they develop. 
Yet the extent to which timing of reproduction (beginning of the larval 
phase) directly influences timing of settlement (end of the larval 
phase) is unclear, in part because reproduction and settlement are 
seldom studied together. Here, we used long-term (2014-2018) monitoring 
data from Bird Rock, La Jolla, CA to measure phenology of reproduction 
and settlement of the acorn barnacle Chthamalus fissus. Weekly samples 
were collected to assess seasonality in C. fissuslife stages, and daily 
samples were collected to evaluate lunar periodicity. We found clear 
evidence of both seasonal and lunar/tidal periodicity, but not in all 
life stages, indicating that biological or oceanographic factors are 
acting to decouple these events. Moving forward, it will be increasingly 
important to monitor marine invertebrate phenology, as this is one of 
the major modes of species response to climate change.


Jordan Pitt- Do Microplastics Accumulate in Food Webs?

Abstract: Microplastics are complex and ubiquitous environmental 
contaminants of worldwide concern. They have been found frequently to be 
ingested by various marine organisms ranging in size from microscopic 
plankton to megafauna. Consequently, it has been widely inferred that 
microplastics can bioaccumulate in organisms and transfer through the 
food web, possibly leading to biomagnification. I critically reviewed 
the literature and identified several limitations in our current 
understanding of microplastic behavior in marine food webs. Through this 
analysis I have begun to challenge the adoption of the traditional 
chemical bioaccumulation framework for microplastics, given their 
particulate and inert nature. I have also found a mismatch between the 
experimental questions and the data collected in the published studies. 
In this presentation, I will discuss the challenges and limitations of 
these studies and provide some guidelines for investigating the 
bioaccumulation, trophic transfer, and possible biomagnification of 
microplastics in marine organisms.


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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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