Scientists Present Historical View of Overfishing
Human-induced mass extinction of ocean life may have begun to appear thousands of years ago and continued throughout our history, according to the cover story of the July 27 issue of the journal Science.
Ecological extinction caused by overfishing precedes all other pervasive human disturbance to coastal ecosystems including pollution, degradation of water quality and anthropogenic climate change,â begins the article. It describes many species, for example large sea turtles in the Caribbean whose adult populations now number in tens of thousands rather than the tens of millions of a few centuries ago.
âWhat became very apparent in all these historical sequences is that quite frankly, the big animals were effectively removed. We can only speculate on what these ecosystems looked like with an abundance of large animals present, but they must have been spectacularâ said Robert Warner, professor of biology at the University of California, Santa Barbara.
He compared the overfishing to the recent study that implicates humans in the extinction of large animals on land in North America and Australia.
Regarding the current study, he continued, âOne of the important lessons of this study is that we canât restore ecosystems by simply reducing nutrient input or stopping pollution, or slowing global warming. We have removed whole groups of players from the stage, and any design for restoration must include plans to help these creatures play their proper roles.â