Feeding by the heterotrophic dinoflagellate Protoperidinium bipes on the diatom Skeletonema costatum
2004; Inter-Research Science Center; Volume: 36; Linguagem: Inglês
10.3354/ame036171
ISSN1616-1564
AutoresHae Jin Jeong, Yeong Du Yoo, ST Kim, NS Kang,
Tópico(s)Microbial Community Ecology and Physiology
ResumoAME Aquatic Microbial Ecology Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsSpecials AME 36:171-179 (2004) - doi:10.3354/ame036171 Feeding by the heterotrophic dinoflagellate Protoperidinium bipes on the diatom Skeletonema costatum Hae Jin Jeong1,*, Yeong Du Yoo2, Seong Taek Kim2, Nam Seon Kang2 1School of Earth and Environmental Science, College of Natural Sciences, Seoul National University, Seoul 151-747, RO Korea 2Department of Oceanography, Kunsan National University, San 68, Miryong-dong, Kunsan 573-701, RO Korea *Email: hjjeong@snu.ac.kr ABSTRACT: The heterotrophic dinoflagellate Protoperidinium bipes is a predominant heterotrophic dinoflagellate (maximum density = 137 cells ml-1) during diatom blooms. To investigate its role as a grazer in the population dynamics of diatoms, we measured growth and ingestion rates of P. bipes when feeding on the common diatom Skeletonema costatum. We also calculated grazing coefficients by combining field data on abundances of P. bipes and co-occurring S. costatum with laboratory data on ingestion rates obtained in the present study. Specific growth rates of P. bipes increased continuously with increasing concentration of S. costatum. The maximum specific growth rate of P. bipes on S. costatum was 1.37 d-1 when data for the growth rate were fitted to a Michaelis-Menten equation. The threshold prey concentration (where net growth = 0) was 111 ng C ml-1 (4270 cells ml-1). Maximum ingestion and clearance rates of P. bipes on this diatom were 2.9 ng C grazer-1 d-1 (112 cells grazer-1 d-1) and 1.0 μl grazer-1 h-1, respectively. P. bipes exhibited the highest maximum swimming speed (ca. 8.3 mm s-1) and maximum volume-specific clearance rate (5.4 × 106 h-1) among Protoperidinium species so far reported. Calculated grazing coefficients by P. bipes on S. costatum (0.001 to 0.034 h-1, i.e. 0.1 to 3.4% of S. costatum populations were removed by a P. bipes population in 1 h) were much higher than those by co-occurring Acartia spp. (<0.002 h-1). The results of the present study suggest that P. bipes sometimes has a considerable grazing impact on populations of S. costatum. KEY WORDS: Algal bloom · Growth · Grazing · Impact · Ingestion · Protist · Arcartia · Copepod Full article in pdf format PreviousNextExport citation RSS - Facebook - Tweet - linkedIn Cited by Published in AME Vol. 36, No. 2. Online publication date: July 21, 2004 Print ISSN: 0948-3055; Online ISSN: 1616-1564 Copyright © 2004 Inter-Research.
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