Ocean acidification effects noted in Hood CanalJuly 13th, 2010 by cdunagan
I was caught off guard yesterday when scientists studying Hood Canal and Puget Sound announced that ocean acidification could be worse in inland waterways than in the ocean. I received a quick chemistry lesson from Richard Feeley of NOAA’s Pacific Marine Experimental Laboratory and rushed a story into today’s Kitsap Sun.
I have written about ocean acidification in Water Ways in the past. (See June 2, 2009; July 9, 2009; Jan. 22, 2010; March 18, 2010; and April 19, 2010.) I’ve also written about the troubles in oyster hatcheries with the bacteria Vibrio tubiashii (Kitsap Sun, June 18, 2008). But now growing evidence is revealing a close relation between these problems and a threat to some vital critters at the base of the food web.
Jan Newton, an oceanographer who has studied Hood Canal for years, along with her colleagues at the University of Washington have patiently helped me understand the science behind the low-oxygen problems in Hood Canal. I’ve passed much of that information on to readers of the Kitsap Sun and Watching Our Water Ways.
I asked Jan yesterday if she was ready to guide me through this new science behind ocean acidification in Hood Canal and the double-whammy effect connected to the dissolved oxygen problem.
Dick Feeley pointed out a basic problem facing aquatic animals, almost all of which require oxygen to survive. As carbon dioxide levels increase, the rate of respiration increases to obtain enough oxygen for the animals to go about their lives. If oxygen levels are low, the animals will expend more energy just to survive. Some of them may become more sluggish and unable to increase their food intake at the very time they need to replenish their energy reserves.
These kinds of subtle — or not so subtle — effects need to be examined to understand the risks to the entire food web of Hood Canal and Puget Sound.
As for critters with shells, ocean acidification can inhibit shell growth when the animals are tiny and in their free-swimming larval stage — the most vulnerable time of their lives.
I have many questions to explore in the coming weeks and months, as researchers examine new data they are gathering. I’m still reviewing the research report published in the August issue of “Estuarine Coastal and Shelf Science.” which can be purchased online for $19.95. Stay tuned for more.