Abundance and biomass of nano- and microplankton during the 1995 Northeast Monsoon and Spring Intermonsoon in the Arabian Sea |
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| Institution: | 1. Marine Radionuclide Research Center, Korea Institute of Ocean Science and Technology, Ansan 15627, South Korea;2. Department of Oceanography, Pusan National University, Busan 46241, South Korea;3. Division of Polar Ocean Sciences, Korea Polar Research Institute, Incheon 21990, South Korea;4. Key Laboratory of Global Change and Marine-Atmospheric Chemistry, Third Institute of Oceanography, Xiamen 361005, PR China;5. Unit of Arctic Sea-Ice Prediction, Korea Polar Research Institute, Incheon 21990, South Korea;1. Département de biologie, Québec-Océan, Université Laval, Québec, Québec G1V 0A6, Canada;2. Centre for Earth Observation Science (CEOS), Faculty of Environment, Earth and Resources, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada;3. Institut des sciences de la mer de Rimouski (ISMER), Université du Québec à Rimouski, Rimouski, Québec G5L 3A1, Canada;4. Maurice Lamontagne Institute, Fisheries and Oceans Canada, Mont-Joli, Québec G5H 3Z4, Canada;5. University of Groningen, Groningen Institute for Evolutionary Life Sciences, Plant Ecophysiology, P.O. Box 11103, 9700 CC Groningen, The Netherlands;1. Posgrado en Ciencias del Mar y Limnología, Instituto de Ciencias del Mar y Limnología, Universidad Nacional Autónoma de México;2. Unidad Académica Mazatlán, Instituto de Ciencias del Mar y Limnología, Universidad Nacional Autónoma de México, Mazatlán, Sinaloa 82000, Mexico;3. Centro de Investigaciones Biológicas del Noroeste, Laboratorio UAS-CIBNOR, Mazatlán, Sinaloa 82000, Mexico;4. Centro de Investigaciones Biológicas del Noroeste (CIBNOR), La Paz, Baja California Sur 23096, Mexico;2. Institut National des Sciences et Technologies de la Mer, Salammbô, Tunisie;3. Institut Supérieur de Pêche et d’Aquaculture de Bizerte, Bizerte, Tunisie;4. Université de Tunis El Manar, Tunis, Tunisie;5. Universidade do Estado do Rio de Janeiro—UERJ, Rio de Janeiro, Brazil;6. Institut National des Sciences et Technologies de la Mer, Monastir, Tunisie;11. Institut National des Sciences et Technologies de la Mer, La Goulette, Tunisie |
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| Abstract: | Phototrophic and heterotrophic nanoplankton (PNAN, HNAN; 2–20 μm protists) and microplankton (PMIC, HMIC; 20–200 μm protists and micrometazoa) are major components of the producer and consumer assemblages in oceanic plankton communities. Abundances and biomasses of these microorganisms were determined from samples collected along two transects during the Northeast Monsoon and Spring Intermonsoon process cruises of the US JGOFS Arabian Sea Program in 1995. Vertical profiles of these assemblages were strongly affected by the presence of a subsurface oxygen minimum layer. Abundances of all four assemblages decreased dramatically below the top of this layer. Depth-integrated (0–160 m) abundances and biomasses of nanoplankton and microplankton were of similar magnitude for most samples. Exceptions to this rule were primarily due to PMIC (mostly diatom) species which dominated phytoplankton assemblages at a few stations during each season. Depth-integrated biomasses for the combined nano- and microplankton averaged over all stations for each cruise were surprisingly similar for the Northeast Monsoon and Spring Intermonsoon seasons in this ecosystem (2.0 and 1.8 g C m?2 170 and 150 m moles C m?2] for the two seasons, respectively). Nano- and microplankton biomass for these two time periods constituted a signficant portion of the total amount of the particulate organic carbon (POC) in the water column. Summed over all stations, these assemblages constituted approximately 25–35% of the POC in the top 160 m of the northern Arabian Sea. |
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