Overfishing: Oceans Are Dying
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| A surprising threshold for seabird survival |
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| Friday, 23 December 2011 07:20 | |||
 Fishing can have devastating effects on seabirds. Not only do they get snagged on hooks and tangled in nets, but chronic overfishing can deprive the birds of their prey—the same small fish that boats are catching. Now a study has identified what appears to be a universal threshold for danger: when the biomass of so-called forage fish drops below one-third of its maximum, seabirds of many species start to have fewer chicks.
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