Microzooplankton grazing and selective feeding during bloom periods in the Tolo Harbour area as revealed by HPLC pigment analysis |
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| Institution: | 1. Department of Geology, University of Salamanca, 37008 Salamanca, Spain;2. Institute of Earth Sciences, Université de Lausanne, CH-1015 Lausanne, Switzerland;3. Oceanología, Centro de Investigación Científica y de Educación Superior de Ensenada (CICESE), 22860 Ensenada, Mexico;1. Centre de Recherche Développement de la Gendarmerie Nationale, Algiers, Algeria;2. Electrical Engineering and Computer Engineering Department, Laval University, Quebec city, QC, G1K 7P4, Canada;3. Department of Electrical and Computer Engineering, Western University, London, Ontario, Canada;4. School of Electronics, EE and CS Department, Queen’s University, Belfast, Northern Ireland, UK;1. Instituto Geológico del Sur, Universidad Nacional del Sur, Departamento de Geología, San Juan 670, B8000ICN Bahía Blanca, Argentina;2. Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Argentina |
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| Abstract: | Dilution experiments were conducted to investigate microzooplankton grazing impact on phytoplankton of different taxonomic groups and size fractions (< 5, 5–20, 20–200 μm) during spring and summer bloom periods at two different sites (inner Tolo Harbour and Tolo Channel) in the Tolo Harbour area, the northeastern coastal area of Hong Kong. Experiments combined with HPLC pigment analysis in three phytoplankton size fractions measured pigment and size specific phytoplankton growth rates and microzooplankton grazing rates. Pigment-specific phytoplankton growth rates ranged between 0.08 and 3.53 d? 1, while specific grazing rates of microzooplankton ranged between 0.07 and 2.82 d? 1. Highest specific rates of phytoplankton growth and microzooplankton grazing were both measured in fucoxanthin in 5–20 μm size fraction in inner Tolo Harbour in summer, which coincided with the occurrence of diatom bloom. Results showed significant correlations between phytoplankton growth and microzooplankton grazing rates. Microzooplankton placed high grazing pressure on phytoplankton community. High microzooplankton grazing impact on alloxanthin (2.63–5.13) suggested strong selection toward cryptophytes. Our results provided no evidence for size selective grazing on phytoplankton by microzooplankton. |
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