Acidic oceans threaten fish : Nature News & Comment
I've become slack about posting items concerning ocean acidification. This is partly because a lot of the studies being reported at the Ocean Acidification blog have become very technical in nature - examining in minute detail the biochemistry of marine organisms and trying to tell exactly how ocean chemistry affects it - and also because there doesn't seem to have been much reported lately on the rate of acidification.
But still, I should go back and catch some of the stories that I have missed.
Anyway, today there is a Nature report (see above) about a couple of studies indicating that young larvae of a couple of fish do not do well under acidification.
Skeptics will no doubt have a couple of objections: firstly, some coastal waters where fish breed already have a really high range of natural pH. I doubt that this is a valid objection, as an increase in acidification from the atmosphere just means that the range is going to shift its mean and peaks to the high end, so it still may be a problem. The second issue will be whether natural selection will mean fish will be able to evolve quickly to adapt to the new acidification regime.
Quick adaptation to warmer sea warmers was indicated in a recent Australian study, but whether this will apply to acidification is anyone's guess.
On the downside of the warmer water story, another study recently indicated that fish parasites can do better in warmer water, which just shows how complicated it is trying to work out the net effect of warming oceans and increasing acidification.
Still, it surprises me somewhat that it took this long for a studies on fish larvae mortality under increased acidification took this long to be done.
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