'Barren' ocean area may be teeming with marine life

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Washington, September 23 : An international team of earth scientists has reported movement of warmed sea water through the flat, Pacific Ocean floor off Costa Rica, which is greater than that off midocean volcanic ridges, a find that suggests possible marine life in a part of the ocean once considered barren.

A new finding reported by American, Canadian and German earth scientists suggests a rather unremarkable area off the Costa Rican Pacific coast holds clues to better understand sea floor ecosystems.

The research team that has studied the region, located between 50 and 150 miles offshore and covering an area the size of Connecticut.

The sea floor, some two miles below, is marked by a collection of about 10 widely separated outcrops or mounts, rising from sediment covering crust made of extinct volcanic rock some 20-25 million years old.

Carol Stein, professor of earth and environmental sciences at the University of Illinois at Chicago, and her colleagues, found that seawater on this cold ocean floor is flowing through cracks and crevices faster and in greater quantity than what is typically found at mid-ocean ridges formed by rising lava.

Water temperatures, while not as hot as by the ridge lava outcrops, are surprisingly warm as well. Finding so much movement in a bland area of the ocean was surprising.

"When we went out to try to get a feel for how much heat was coming from the ocean floor and how much sea water might be moving through it, we found that there was much more heat than we expected at the outcrops," said Stein.

The water gushing from sea floor protrusions warms as it moves through the insulated volcanic rock and picks up heat.

"It's relatively warm and may have some of the nutrients needed to support some of the life forms we see on the sea floor," said Stein.

The earth scientists dropped probes from ships down to the pitch-dark ocean floor to collect temperature and heat-flow data to form images of what is happening in this area of the ocean.

Only in recent decades have earth scientists discovered such life forms as bacteria, clams and tubeworm species living near the hot water discharges along the mid-ocean volcanic ridges.

The rather flat undersea areas which Stein and her colleagues studied were thought to be lifeless, but the nutrient-enhanced warm water flows they discovered suggests this area too may be capable of supporting life.

"The sea floor may not be quite as much of a desert even as we thought maybe 20 or 10 years ago, but rather there may be a lot of locations similar to this well-studied area in terms of the water flow where there's a lot more biological activity," said Stein.

ANI

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