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EFFECTS OF OCEAN ACIDIFICATION ON THE FEEDING RATES OF THE EASTERN OYSTER CRASSOSTREA VIRGINICA (E) (E)

As a result of climate change, the oceans have become 30 percent more acidic over the past 200 years. Such fast, drastic changes have not been observed in the last 50 million years, necessitating the study of ocean acidification to determine how it may influence living marine resources. Although marine organisms like the eastern oyster, Crassostrea virginica, have adapted to daily fluctuations in pH, changes in baseline concentrations at this time scale are unprecedented. While the effects of ocean acidification on the calcification rates of marine organisms have been well-documented, the effects on feeding rates are not well-understood. This lab-based experiment aimed to elucidate this relationship through a biodeposition analysis. Juvenile and adult oysters (n = 32) were collected from Fishers Island, NY, and exposed to either low (400-800 ppm) or high (>1200 ppm) CO2 treatments for seven days before starting the feeding trial. During the experiment, animals fed on natural assemblages of particles. Feces (captured and digested particles) and pseudofeces (captured but rejected particles) were collected. Significantly lower filtration and clearance rates were observed in individuals exposed to the high CO2 treatment (n = 16), suggesting that exposure to ocean acidification induces a physiological response and alteration of feeding rates. Feeding is a critical component of survival, growth and reproduction. It is important to understand the effects of ocean acidification on all physiological and morphological properties of marine organisms in order to garner a clearer understanding of how they respond and adapt to their changing environment.

Authors

Raney, S. E., Eckerd College, USA, seraney@eckerd.edu

Meseck, S., NOAA NEFSC Milford Laboratory, USA, shannon.meseck@noaa.gov

Milke, L., NOAA NEFSC Milford Laboratory, USA, lisa.milke@noaa.gov

Details

Poster presentation

Session #:056
Date: 03/01/2017
Time: 11:00 - 12:00
Location: Poster/Exhibit Hall

Presentation is given by student: Yes

PosterID: 471