JOURNAL OF PLANKTON RESEARCH | VOLUME 9 | NUMBER 4 | PAGES 667-683 | 1987
© Oxford University Press
research-article |
Feeding by larval and post-larval ctenophores on microzooplankton
1Skidway Institute of Oceanography PO Box 13687, Savannah, GA 31416, USA Biology Department, Woods Hole Oceanographic Institution Woods Hole, MA 02543
Received on August 12, 1986; accepted on April 14, 1987 Feeding by the coastal ctenophorc, Mnemiopsis leidyi, on microplankton was investigated. Larval ctenophores (tentaculate stage) grew best and had the highest survival rates when offered a mixture of ciliates and copepod nauplii. Larvae did not survive when offered phytoplankton alone. Clearing of planktonjc ciliates by post-larval ctenophores was a function of the ciliate species and the size of the predator. Removal of small ciliates (<20 µm in size) and phytoplankton was negligible. Small post-larval ctenophores (volume <4 cm3) had higher biovolume-specific clearing rates (0.51.5 1 cm3 day1) than did larger ctenophores fed the same ciliate species. During in situ incubations, adult M. leidyi removed ciliates, rotifers and copepod nauplii from natural microplankton assemblages. The data indicate that non-crustacean microzooplanlctoo are an important component of the diet of larval and post-larval locate cteoophores, particularly when copepod standing stocks are low.
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