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Luxuriant life on the Galápagos seafloor |
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Eos, Transactions American Geophysical Union,
Volume 62,
Issue 52,
1981,
Page 1201-1201
Peter M. Bell,
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摘要:
Marine life found unexpectedly in 1977 in the vicinity of hydrothermal vents along the Galápagos Rift has proven to be of considerable interest because of newly discovered growth mechanisms. Among the life forms observed were giant tube worms, clams, mussels, and plantlike animals. If the sizes alone were beyond belief, the hostility of the living environment—noxious, hydrogen sulfide‐rich warm pockets—appeared bizarre. Even though life at depths of 2.5 km on the seafloor is known normally to be sparse in comparison with shallow‐water biological systems, the heated water pockets seem to account for the localized contradictions. What was difficult to explain was the toxic environment and the apparent lack of nutrients. Furthermore, the tube worms had no mouths, not even digestive systems. Recent reports inScience(November 20, 1981), and by the Smithsonian Institution (Research Reports), describe findings on bivalves studied at the hydrothermal vents and tube worms returned to the laboratory by the U.S. Navy research submersibleAlvin.The growth rates are among the highest known for deep‐sea life. The way the deep seafloor marine life are understood to ‘eat’ (absorb nutrients would be a better description) involves mechanisms never observed before that breakdown hydrogen sulfide
ISSN:0002-8606
DOI:10.1029/EO062i052p01201-01
年代:1981
数据来源: WILEY
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Nation's water picture better but southeast still dry |
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Eos, Transactions American Geophysical Union,
Volume 62,
Issue 52,
1981,
Page 1202-1202
Anonymous,
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PDF (130KB)
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摘要:
The flow of the nation's ‘Big Five’ rivers, representing stream runoff from about half of the conterminous United States, increased during November and was 13% above normal for the month, according to the U.S. Geological Survey. USGS scientists said flow of these rivers—the Mississippi, St. Lawrence, Ohio, Columbia, and Missouri—increased from 483 billion gallons per day (bgd) during October, a rate which was 2% above normal for the month, to 553 bgd during November. Because of the large area draining into the Big Five, their combined flow provides a quick, useful check on the pulse of the nation's water resources. The Big Five flow has been above average for the last
ISSN:0002-8606
DOI:10.1029/EO062i052p01202-01
年代:1981
数据来源: WILEY
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