MEPS 286:293-305 (2005)  -  doi:10.3354/meps286293

Colloquium on diatom-copepod interactions

G. A. Paffenhöfer1,*,+, ♦, A. Ianora2,+, ♦, A. Miralto2,+, J. T. Turner3, ♦, G. S. Kleppel4, ♦, M. Ribera d’Alcalà2, ♦, R. Casotti2,♦, G. S. Caldwell5,♦, G. Pohnert6,♦, A. Fontana7,♦,D. Müller-Navarra8,♦, S. Jónasdóttir9,♦, V. Armbrust10,#,U. Båmstedt11,#, S. Ban12,#,M. G. Bentley5,#, M. Boersma13,#, M. Bundy14,#, I. Buttino2,#, A. Calbet15,#, F. Carlotti16,#, Y. Carotenuto2,#, G. d’Ippolito2,#, B. Frost10,#, C. Guisande17,#, W. Lampert18,#, R. F. Lee1,#, S. Mazza2,#, M. G. Mazzocchi2,#, J. C. Nejstgaard11,#, S. A. Poulet19,#, G. Romano2,#, V. Smetacek20,#, S. Uye21,#, S. Wakeham1,#, S. Watson22,#, T. Wichard6,#

1Skidaway Institute of Oceanography, Savannah, Georgia 31411, USA; 2Stazione Zoologica Anton Dohrn, 80121 Napoli, Italy; 3Biology Department, University of Massachusetts Dartmouth, North Dartmouth, Massachusetts 02747, USA; 4Department of Biological Sciences, University at Albany, State University of New York, Albany, New York 12222, USA; 5Marine Science and Technology, University of Newcastle upon Tyne, Newcastle upon Tyne NE1 7RU, UK; 6Max-Planck-Institut für Chemische Ökologie, 07745 Jena, Germany; 7Istituto per la Chimica Biomolecolare del CNR, 80121 Napoli, Italy; 8Institut für Hydrobiologie und Fischereiwissenschaft, 22767 Hamburg, Germany; 9Department of Marine Ecology and Aquaculture, Danish Institute for Fisheries Research, 2920 Charlottenlund, Denmark; 10School of Oceanography, University of Washington, Seattle, Washington 98195-7940, USA; 11Department of Fisheries and Marine Biology, University of Bergen, 5020 Bergen, Norway; 12University of Shiga Prefecture, Hikone, Tokyo 164, Japan; 13AWI-Biologische Anstalt Helgoland, 27498 Helgoland, Germany; 14Academy of Natural Sciences Estuarine Research Center, St. Leonard, Maryland 20685, USA; 15Institut de Ciències del Mar - CMIMA (CSIC), 08003 Barcelona, Spain; 16Station Marine d'Arcachon, CNRS, Université de Bordeaux, 33120 Arcachon, France; 17Facultad de Ciencias, Universidad de Vigo, 36200 Vigo, Spain; 18Max-Planck-Institut für Limnologie, 24302 Plön, Germany; 19Station Biologique, CNRS, 29682 Roscoff, France; 20Alfred-Wegener-Institut für Polar- und Meeresforschung, 27515 Bremerhaven, Germany; 21Hiroshima University, Higashi-Hiroshima 739-8528, Japan; 22Environment Canada and University of Calgary, Alberta T2N 1N4, Canada
*Email: +Convener, Contributing author, #Other participant

ABSTRACT: From 3 to 6 November 2002, a colloquium was convened at the Benthos Laboratory of the Stazione Zoologica Anton Dohrn on Ischia, Italy, with the goal of evaluating the present status of the effects of diatoms on their main consumers, the planktonic copepods, and to develop future research strategies to enhance our understanding of such interactions. These included (1) toxic effects of diatom metabolites on copepods, particularly reproduction, and (2) nutritional effects of diatoms on juvenile to adult copepods. Key issues involved in the impact of diatoms on the dynamics of natural plankton communities in situ were also addressed. During the plenary session, the most recent advances on this topic were presented. The plenary session was followed by 3 working groups on (1) production of aldehydes by phytoplankton, (2) toxic and nutritional effects of diatoms on zooplankton, and (3) the chemistry of diatom defense, as well as of their nutritional quality. These working groups focused on suggesting future research needs for the different topics. As a result, several recommendations were outlined, including experimental studies. It became evident that interdisciplinary efforts are needed, involving chemists, oceanographers and experimentalists, since many of the biological observations under controlled conditions and in situ require an integrated approach, including chemical causation. Extensive field observations based on common protocols are also recommended for investigation of the intrinsic variability of such effects and their environmental controls. Laboratory experiments are seen to be essential for the full understanding of environmentally occurring processes.

KEY WORDS: Diatoms · Copepods · Toxicity · Nutrition

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