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Salmon returning to the rivers of Vancouver Island to spawn have always had a long and perilous migration route. But in the past 10 years their time away has become deadlier than ever, with populations dropping precipitously.

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A new study shows that dead zones in the lower Chesapeake Bay are beginning to break up earlier in the fall, which may be an indication that efforts to reduce nutrient pollution to the Bay are beginning to make an impact. Scientists from the University of Maryland Center for Environmental Science examined 30 years of data on dead zones and nutrient levels in the Chesapeake Bay. They found that dead zones in the lower part of the Chesapeake Bay, the saltier part from the Potomac River south, are getting smaller in the late summer thanks to a late-season replenishment of oxygen, a natural response to decreasing nutrient pollution.

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