27 Apr 2012:
Pacific Shark Survey Shows
90 Percent Decline Near Human Populatons
A comprehensive census of Pacific reef shark populations has found that shark abundance has plummeted by roughly 90 percent
in waters located near islands inhabited by humans. Using underwater surveys
conducted by divers across 46 U.S. Pacific islands and atolls, researchers found that shark numbers near human populations — including on the main Hawaiian Islands and the Mariana Archipelago — were consistently depressed, regardless of location or ocean conditions, compared with pristine reef areas located farther away from humans. In fact, the researchers estimated that shark populations are less than 10 percent of historically peak numbers in these areas, said Marc Nadon, a scientist at the University of Hawaii and lead author of the study, published in the journal Conservation Biology
. “In short, people and sharks don’t mix,” he said. Researchers say the data helps quantify how human activities — including overfishing and the controversial practice of shark-finning — are decimating shark numbers. The study was conducted as part of NOAA’s Pacific Reef Assessment and Monitoring Program.
Yale Environment 360 is
a publication of the
Yale School of Forestry
& Environmental Studies
Yale Environment 360
articles are now available in Spanish and Portuguese on Universia
, the online educational network. Visit the site.
Business & Innovation
Policy & Politics
Pollution & Health
Science & Technology
Antarctica and the Arctic
Central & South America
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.
is now available for mobile devices at e360.yale.edu/mobile
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.
Watch the video.
Tribal people and ranchers join together to stop a project that would haul coal across their Montana land. Watch the video.