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The unknown ocean world

The vast world that exists beneath the surface of the ocean remains largely unknown to humankind, say experts working on an international database of marine species.

Of an estimated one million species that make their home in the depths of the sea, as many as two-thirds of them are still a mystery, says a study published this week.

Canada has more coastline than any other nation on Earth, a staggering 200,000 kilometres plus, and the nation's territorial waters cover more than seven million square kilometres over three different oceans.

The country is a world leader in marine research but even here, the sea still holds many surprises, says Gerhard Pohle, acting executive director of the Huntsman Marine Science Centre in St. Andrews, N.B.

"There are an amazing amount of things, especially in the ocean, that we don't know in terms of biodiversity," says Pohle, who spent a decade taking part in an international Census of Marine Life, a decade-long project than concluded in 2010.

It was only last year that scientists published research that estimated there are approximately 10 million distinct species on Earth, Pohle said.

"It's staggering to think that as recently as 2011, we did not know how many species there are in the world by order of magnitude. The estimates were anywhere from three to 100 million species globally. That was it," Pohle says.

"I'm somebody who works on this and when I saw it, I couldn't believe it."

The article published in the academic journal Current Biology this week estimates there are one million marine species.

A World Register of Marine Species has catalogued 226,000 of them so far. As many as 72,000 more specimens have been collected and are waiting to be described.

"Knowing what lives in the ocean is fundamental to appreciate, care and protect it," said Ward Appeltans, one of the authors and the project manager of the Ocean Biogeographic Information System of UNESCO's Intergovernmental Oceanographic Commission.

"Having a single catalogue of all known marine species is like an index in a library. We can all start using the same species names, avoid confusion over names and make less mistakes."

The Canadian Press
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