The French have discovered that UV radiation penetrates up to 100m deep in the waters of the southeast Pacific Ocean. They propose this might explain why surface waters in this region are poor in nutrients and a relative biological desert. As you may recall from your science classes UV degrades organic compounds including DNA. The research appears in the journal Geophysical Research Letters.
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there have been some speculative stories out there on catastrophic consequences of the oil leak in the Gulf of Mexico, up to and including Florida being swallowed
can't happen
"Making supplemental appropriations for job preservation and creation, infrastructure investment, energy efficiency and science..."
Chauliognathus lecontei - LeConte's Soldier Beetle
Chiricahua Mountains, Arizona
Secrets of the Gulf Expedition is broadcasting live footage of submersible surveys at 100m depth around the Flower Garden Banks in the Gulf of Mexico.
another selective pressure for countershading?
Good question without an answer. To answer this you would have to show that fish from this region were relatively darker than there counterparts in areas were UV penetration was not as deep.