Showing 1321 - 1330 of 2040 Items
Effects of Alkalinity and Ocean Acidification on Clam Shell Development in Phippsburg, ME
Date: 2014-08-01
Creator: Bailey Moritz
Access: Open access
- With increased CO2 in the atmosphere from the burning of fossil fuels, more is absorbed into the surface ocean, causing a reaction that leads to lower pH. This process is known as ocean acidification, which has raised global concern. Over the past decade, the clam flat near Head Beach in Phippsburg has been reduced to approximately a sixth of its former productive area. The town of Phippsburg allots money every spring to seed the clam flat with juvenile soft-shell clams (Mya arenaria) in order to support the local clamming economy, but the clams are no longer growing in much of the mud flat. A possible explanation for this loss is acidification. In order to understand if ocean acidification is the cause, I collected water samples from the mud to test for alkalinity along a transect of 5 sites spanning productive and non-productive areas of the flat. Alkalinity is a measurement of the waters ability to buffer pH changes. Lower alkalinity could mean that clams would have more difficulty forming their calcium carbonate shells due to dissolution in low pH waters. Combined with the pH measurements gathered by my peer, Lloyd Anderson ‘16, we were able to calculate aragonite saturation state. Water with a saturation state below 1 is capable of dissolving calcium carbonate (aragonite) shells. A large portion of this research project was figuring out the best methodology to use for collecting data on the clam flat. The tested water needs to represent that which the clams are actually using while they are embedded in the mud. Additionally, juvenile clams only live in the upper centimeter or so of sediment. We followed methodologies used in past studies in Maine (Green et al 2013). Three pore water samples from each site were extracted and brought back to the lab to be filtered on 7 separate days throughout July. We began sampling 2 hours prior to low tide. I determined alkalinity using an automated titration system. Average alkalinity ranged from 2200-2500 μeq/kg. The results indicated that there was not a significant difference or pattern in alkalinity or saturation state between productive and unproductive areas of the clam flat (Fig. 1). Error bars in the figure represent variability at each site over the entire study period, while analytical reproducibility was ± 9.04 μeq/L. Large changes were observed merely from one day to another. Coastal ecosystems are complex and variations such as time of day, temperature, or productivity may have influences on the porewater characteristics (Duarte 2013). While ocean acidification does not appear to be the primary driving force behind the clams’ decline at this location, the saturation state was consistently quite low ( Final Report of research funded by the Rusack Coastal Studies Fellowship.
Prints of Edvard Munch: Mirror of His Life: An Exhibition of Prints from the Collection of Sarah G. and Lionel C. Epstein
Date: 1983-01-01
Creator: Sarah G. Epstein
Access: Open access
- Exhibition held at the Allen Memorial Art Museum, Mar. 1-27, 1983, and later at other museums, including Bowdoin College Museum of Art, Sept. 23-nov. 13, 1983.
Salton Collection : Renaissance & Baroque Medals & Plaquettes (1969 Revision)
Date: 1969-01-01
Access: Open access
- "The present collection ... belongs to Mr. and Mrs. Mark Salton of New York." "One thousand five hundred copies of this catalogue have been printed ... Composition by the Anthosensen Press, Portland, Maine. Photography by John McKee. Design by Leonard Baskin. October MCMLXV"--Colophon This is a revised edition of the 1965 original publication.
Reflections questionnaire response by Anonymous on March 24, 2021
Date: 2021-01-01
Creator: Anonymous
Access: Open access
- This is a response to the Documenting Bowdoin & COVID-19 Reflections Questionnaire. The questionnaire was created in March 2021 by staff of Bowdoin's George J. Mitchell Department of Special Collections & Archives. Author is class of 2024.
Bowdoin College - Medical School of Maine Catalogue (1879-1880)
Date: 1880-01-01
Access: Open access