Carbon and nitrogen isotopic composition of the fauna from the Broken Spur hydrothermal vent field |
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| Authors: | A L Vereshchaka G M Vinogradov A Yu Lein S Dalton F Dehairs |
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| Institution: | (1) Institute of Oceanology, Russian Academy of Sciences, Nakhimov Prospekt 36, Moscow, 117851 Russia, RU;(2) Institute of the Problems of Evolution, Russian Academy of Sciences, Leninsky Prospekt 33, Moscow, 117071 Russia, RU;(3) Vrije University, Pleinlaan 2, B-1050 Brussels, Belgium, BE |
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| Abstract: | The carbon and nitrogen isotopic composition of 18 faunistic groups collected during the 39th cruise of the R.V. “Akademik
Mstislav Keldysh” in September 1996 at the Broken Spur vent field, MAR, was studied. The trophic structure of the Broken Spur
vent community is considered. All age stages of the shrimp Rimicaris exoculata living 5 m below the main aggregations at black smokers show higher δ15N and more depleted δ13C values than the same stages inhabiting the black smokers themselves. The shrimps R. exoculata and Chorocaris chacei demonstrate ontogenetic changes in δ13C (the former also in δ15N), with smaller individuals showing higher δ15N and more depleted δ13C values than larger shrimps. Benthopelagic and benthic components of the vent community differ significantly in δ13C and δ15N, the benthic fauna being less dependent upon chemosynthetic production.
Received: 30 March 1999 / Accepted: 28 September 1999 |
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