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Ocean Acidification

Ocean Acidification. The Gulf of Maine is uniquely susceptible. Cold water absorbs CO 2 more readily. Colder, fresher water entering GoM from Canada has a lower pH. (Salisbury et al. EOS 2008). Fresh water coming in from many rivers is more acidic.

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Ocean Acidification

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  1. Ocean Acidification

  2. The Gulf of Maine is uniquely susceptible • Cold water absorbs CO2 more readily • Colder, fresher water entering GoMfrom Canada has a lower pH (Salisbury et al. EOS 2008) • Fresh water coming in from many rivers is more acidic • Semi-enclosed shape may increase residence time (Salisbury and Hunt, unpublished)

  3. Input of nutrients can cause acidification of coastal waters- “coastal acidification” From Kelly et al. 2011. Science.

  4. Ocean Acidification Is Already Happening Past, present and future impacts on hard clams- Larval clam survival 50 Two week survival (%) 24 C 29 C 40 Next century Mid Century Present Pre-Industrial 30 Pre-Industrial 250 ppm Current 390 ppm Next-century 1500 ppm Mid-century 750 ppm 20 Larval clam survival- CO2 & temp 10 20 day survival (%) 0 ~750 ~250 ~380 CO2 level Juvenile clam growth (Talmageand Gobler, 2010, 2011)

  5. Preliminary 2014 Commercial Maine Landings by Ex-vessel Value Total $585,348,370 as of 2/25/15 $464 million (including coop bonuses of ~8 million) • over 85% of Maine’s fisheries (by landings value) are shell producing species, including lobster, clams, urchins, scallops, oysters, and mussels • ~7,700 active harvesters targeted shell-building species in 2014

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