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New population numbers: 1 4 million whales, dolphins and porpoises in the European Atlantic

New population numbers: 1 4 million whales, dolphins and porpoises in the European Atlantic
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Harbor porpoises on the decline in the German North Sea

Credit: D. Nachtsheim The North Sea is a heavily trafficked area, with major shipping routes crossing its waters, and fisheries, offshore oil rigs, and wind farms populating its waves. All this activity inevitably has an effect on marine wildlife, and scientists are particularly interested in how the harbor porpoise population has fared in the face of such disturbances. The harbor porpoise is known as a sentinel species - animals which indicate the health of an ecosystem and point to potential risks (think of the canary in the coal mine). According to a recent study published in Frontiers in Marine Science, their population is declining in the German North Sea.

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