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AME 17:99-103 (1999)
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Abstract
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Feeding by the small calanoid copepod Paracalanus sp. on heterotrophic dinoflagellates and ciliates
Kentaro Suzuki1,*, Yasuo Nakamura2,**, Juro Hiromi1
1College of Bioresource Sciences, Nihon University, Kameino, Fujisawa, Kanagawa 252-0813, Japan
2National Institute for Environmental Studies, Tsukuba, Ibaraki 305-0053, Japan
*Present address: Institute of General Science for Environment, Shin-Nippon Meteorological and Oceanographical Consultant, Riemon, Ohi-gawa, Shida, Shidzuoka 421-0212, Japan
**Addressee for correspondence. E-mail: yasuo@nies.go.jp
ABSTRACT: Feeding of the calanoid copepod Paracalanus sp. on natural populations of heterotrophic (h-) dinoflagellates and ciliates was examined during the summer in the Seto Inland Sea, Japan. Paracalanus sp. ingested h-dinoflagellates with
clearance rates of 35 to 146 ml ind.-1 d-1, comparable to those for autotrophic (a-) dinoflagellates. Feeding rates of the copepod on h-dinoflagellates (0.35 to 0.93 µg C ind.-1 d-1) were close to, or in some
cases exceeded, the basic metabolic demands (0.5 µg C ind.-1 d-1) of the copepod. Ciliates were also ingested by Paracalanus sp., but the corresponding clearance rates (23 to 60 ml ind.-1 d-1) were lower
than those for h-dinoflagellates. These results, together with data on the abundance/biomass of Paracalanus sp. and h-dinoflagellates in the study area, indicate that the population of Paracalanus sp. can have a significant feeding impact on
h-dinoflagellates.
KEY WORDS: Copepod · Heterotrophic dinoflagellate · Ciliate · Predation · Paracalanus
Published in AME Vol.
17, No. 1
(1999) on April 30
ISSN: 0948-3055.
Copyright © Inter-Research, Oldendorf/Luhe, 1999
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