Details:

Journal Title:
Limnology and Oceanography
Personal Author:
Cameron, Louise P. ; Grabowski, Jonathan H. ; Ries, Justin B.
Cameron, Louise P. ; Grabowski, Jonathan H. ; Ries, Justin B. Less -
Sea Grant Program:
MIT (MIT Sea Grant)
Description:
Anthropogenic CO2‐emission is causing ocean warming and acidification. Understanding how basic physiological processes of marine organisms respond to these stressors is important for predicting their responses to future global change. We examined the effects of elevated pCO2 and temperature (pCO2 = 344–2199 ppm; temperature = 6°C, 9°C, and 12°C) on the calcification rate, extrapallial fluid (EPF) carbonate chemistry, respiration, and survivorship of Atlantic sea scallops (Placopecten magellanicus) in a fully crossed 143‐d experiment. Rates of calcification and respiration were inhibited by elevated pCO2, and mortality occurred when elevated pCO2 was accompanied by high‐temperature stress. Declines in growth and survivorship were likely caused by external shell dissolution, thermal stress, and hypercapnic reduction of metabolism under elevated pCO2. Concentrations of dissolved inorganic carbon (DIC) and total alkalinity in the EPF increased above seawater concentrations in response to elevated pCO2. EPF pH declined, but did not decline as much as seawater pH, indicating that scallops regulate EPF pH to support calcification. The combination of EPF pH regulation and DIC elevation yielded an increase in EPF [] under elevated pCO2 treatments. The combination of low respiration rates, high EPF [], and low calcification rates under elevated pCO2 suggests that the impaired calcification arises more from hypercapnic inhibition of metabolic activity and external shell dissolution than from chemically unfavorable conditions in the EPF. These results demonstrate the importance of EPF chemistry for bivalve biomineralization, but show that regulation efforts are insufficient to fully offset the deleterious effects of elevated pCO2 on scallop performance.
Keywords:
[+]
Aquatic Science Oceanography
Source:
Limnology and Oceanography, 67(8), 1670-1686
DOI:
https://doi.org/10.1002/lno.12153
ISSN:
0024-3590;1939-5590;
Format:
PDF
Publisher:
Wiley
Document Type:
Journal Article
Funding:
Grant no. NA14OAR41705710004054 ; Grant no. NA18OAR4170105 ; Grant no. NA14NMF4540072
Grant no. NA14OAR41705710004054 ; Grant no. NA18OAR4170105 ; Grant no. NA14NMF4540072 Less -
Rights Information:
Accepted Manuscript
Compliance:
Submitted
Main Document Checksum:
[+]
urn:sha256:b365e31255781738c38459cba82f34138733f61b969e5695358dc2a477a0fe15
Download URL:
https://repository.library.noaa.gov/view/noaa/55329/noaa_55329_DS1.pdf
File Type:

Supporting Files

• No Additional Files

More +