Chemical composition,metabolic rates and feeding behavior of the midwater ctenophore Bathocyroe fosteri |
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| Authors: | M. J. Youngbluth P. Kremer T. G. Bailey C. A. Jacoby |
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| Affiliation: | (1) Harbor Branch Oceanographic Institution, 5600 Old Dixie Highway, 34 946 Fort Pierce, Florida, USA;(2) Allan Hancock Foundation, University of Southern California, 90089-0371 Los Angeles, California, USA;(3) Present address: Marine Laboratory RD, University of Auckland, Leigh, New Zealand |
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| Abstract: | Individuals of the midwater ctenophore Bathocyroe fosteri (0.01 to 1.6 g dry weight, DW) were collected from Bahamian waters by the submersible  Johnson-Sea-Link during May and September/October 1983 and October/November 1984 from 530 to 700 m depth. Metabolic rates were measured and showed oxygen consumption to be in the range of 0.01 to 0.18 mg O2 g-1 DW h-1 at temperatures ranging from 9° to 12°C. Ammonium excretion (0.01 to 0.14  g-at N g-1 DW h-1) was typically low. Energy expenditures estimated from respiration data (ca. 7% body C d-1) indicated that one to three midwater crustacean prey (ca. 150 g C d-1) could provide the daily maintenance ration required by a 40 mm ctenophore. These metabolic characteristics complemented in situ observations of poor locomotor ability and passive feeding behavior. |
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