02 Jul 2012:
Leatherback Turtle Declines
Will Escalate As Climate Warms, Study Finds
A warming climate could exacerbate threats facing leatherback turtle populations in the eastern Pacific Ocean, creating conditions that could trigger a 75 percent reduction in turtle numbers by the end of the century
, a new study says. Even under existing conditions, turtle births ebb and flow each
year, researchers say, with eggs and hatchlings more likely to survive in cooler, rainier seasons, and a greater number of male hatchlings occurring in predominantly female leatherback populations in these conditions. After modeling these population dynamics in light of projected changes in temperature and precipitation in the turtles’ critical nesting areas, particularly the beaches of Costa Rica, researchers from Drexel and Princeton universities projected an increase in egg and hatchling mortality. According to their findings, published in the journal Nature Climate Change
, leatherback populations — which are already vulnerable because of egg poaching and threats posed by fishing operations — could decline 7 percent per decade through 2100. A key in preserving leatherback populations in the future will be manipulating beach conditions to encourage as many good hatchlings as possible, the researchers say.
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A look at how acidifying oceans could threaten the Dungeness crab, one of the most valuable fisheries on the U.S. West Coast. Watch the video.
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An aerial view of why Europe’s per capita carbon emissions are less than 50 percent of those in the U.S. View the photos.
An indigenous tribe’s deadly fight to save its ancestral land in the Amazon rainforest from logging. Learn more.
video series looks at the staggering amount of food wasted in the U.S. – a problem with major human and environmental costs. Watch the video.
Residents of the Chocó Rainforest in Ecuador are choosing to plant cacao over logging in an effort to slow deforestation.
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Tribal people and ranchers join together to stop a project that would haul coal across their Montana land. Watch the video.