In one of the largest scientific collaborations ever conducted, more than 2,700 Census scientists spent over 9,000 days at sea on more than 540 expeditions, plus countless days in labs and archives.

Released today are maps, three landmark books, and a highlights summary that crown a decade of discovery.

The now-completed documentation in books and journals, plus the accumulating databases and established websites, videos, and photo galleries report and conclude the first Census. Over the decade more than 2,600 academic papers were published - one, on average, every 1.5 days.

Presented is an unprecedented picture of the diversity, distribution, and abundance of all kinds of marine life in Planet Ocean - from microbes to whales, from the icy poles to the warm tropics, from tidal near shores to the deepest dark depths.

Oceanic diversity is demonstrated by nearly 30 million observations of 120,000 species organized in the global marine life database of the Census, the Ocean Biogeographic Information System (OBIS).

The migrations tracked across seas and up and down in the water column, plus the revealed ubiquities of many species, demonstrate connections among oceans. Comparisons of the present ocean with the bountiful ocean life portrayed in old archives document changes. The Census established declines - and some recoveries - of marine abundance.

The OBIS directory of names and addresses of known ocean species establishes a reference against which humanity can monitor 21st century change. It also delineates the vast areas of ocean that have never been explored.

"We prevailed over early doubts that a Census was possible, as well as daunting extremes of nature," says Australian Ian Poiner, chair of the Census Steering Committee. "The Age of Discovery continues."

"This cooperative international 21st century voyage has systematically defined for the first time both the known and the vast unknown, unexplored ocean."

According to Dr. Poiner, the beauty, wonder, and importance of marine life are hard to overstate.

"All surface life depends on life inside and beneath the oceans. Sea life provides half of our oxygen and a lot of our food and regulates climate. We are all citizens of the sea. And while much remains unknown, including at least 750,000 undiscovered species and their roles, we are better acquainted now with our fellow travelers and their vast habitat on this globe."

First Census of Marine Life 2010: Highlights of a Decade of Discovery (CoML, 64 pages), edited by Jesse H. Ausubel, Darlene Trew Crist and Paul E. Waggoner.

The highlights summary draws from the three books launched this week.

+ Discoveries of the Census of Marine Life: Making Ocean Life Count (Cambridge University Press, 304 pages), by Paul V.R. Snelgrove, an overview of Census insights and their implications (http://coml.org/discoveries-census-marine-life);

+ Life in the World's Oceans: Diversity, Distribution, and Abundance (Blackwell Publishing Ltd., 384 pages), Alasdair D. McIntyre (editor), a summary of findings and discoveries by the 17 Census projects (http://coml.org/life-worlds-oceans); and

+ Citizens of the Sea: Wondrous Creatures from the Census of Marine Life, (National Geographic, 216 pages), by Nancy Knowlton, portraits of about 100 species (http://coml.org/citizens-sea).

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