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  In situ experimental evidence of the fate of a phytodetritus pulse at the abyssal sea floor

Witte, U., Wenzhöfer, F., Sommer, S., Boetius, A., Heinz, P., Aberle, N., et al. (2003). In situ experimental evidence of the fate of a phytodetritus pulse at the abyssal sea floor. Nature, 424(6950), 763-766.

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Witte, U., Author
Wenzhöfer, F., Author
Sommer, S., Author
Boetius, A., Author
Heinz, P., Author
Aberle, N.1, Author
Sand, M., Author
Cremer, A., Author
Abraham, W.-R., Author
Jørgensen, B. B., Author
Pfannkuche, O., Author
Affiliations:
1Department Ecophysiology, Max Planck Institute for Limnology, Max Planck Institute for Evolutionary Biology, Max Planck Society, ou_persistent22              

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 Abstract: More than 50% of the Earth's surface is sea floor below 3,000 m of water. Most of this major reservoir in the global carbon cycle and final repository for anthropogenic wastes is characterized by severe food limitation. Phytodetritus is the major food source for abyssal benthic communities, and a large fraction of the annual food load can arrive in pulses within a few days(1,2). Owing to logistical constraints, the available data concerning the fate of such a pulse are scattered(3,4) and often contradictory(5-10), hampering global carbon modelling and anthropogenic impact assessments. We quantified (over a period of 2.5 to 23 days) the response of an abyssal benthic community to a phytodetritus pulse, on the basis of 11 in situ experiments. Here we report that, in contrast to previous hypotheses(5-11), the sediment community oxygen consumption doubled immediately, and that macrofauna were very important for initial carbon degradation. The retarded response of bacteria and Foraminifera, the restriction of microbial carbon degradation to the sediment surface, and the low total carbon turnover distinguish abyssal from continental-slope 'deep-sea' sediments

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Language(s): eng - English
 Dates: 2003-08-14
 Publication Status: Issued
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 Identifiers: eDoc: 208109
Other: 2347/S 38276
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Title: Nature
Source Genre: Journal
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Pages: - Volume / Issue: 424 (6950) Sequence Number: - Start / End Page: 763 - 766 Identifier: ISSN: 0028-0836