Abstract
In a subtropical Hawaiian ecosystem, phytoplanton size structure analyses (November–December, 1980) showed that ultraplankton (>3μm), nanoplankton (>20μm) and netplankton (>20μm) accounted for ca. 80, 98, and 2% of total chlorophyll standing stock, respectively, on the basis of chlorophyll. Similar trends were evident, for other biomass indices (e.g. cell numbers, total cell volume, ATP, particulate organic carbon, particulate organic nitrogen). The ultraplankton fraction consisted primarily of small flagellates (1 to 3 μm diam) and coccoid cells (≊1 μm diam); the 3 to 20 μm fraction was represented by dinoflagellates, coccolithophores, diatoms, and chrysophytes; and the netplankton fraction consisted principally of dinoflagellates and centric diatoms. Community photosynthesis had a size distribution similar to that of biomass. Sinking rates for the 3 μm, 3 to 20 μm, and >20 μm fractions averaged 0.0, 0.09, and 0.29m d−1, respectively. The absence of measurable sinking rates for the ultraplankton, together with the relative abundance of biomass in this fraction, result in very small phytoplankton losses due to sinking in such subtropical surface waters.
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Communicated by N. D. Holland, La Jolla
Oceanic Institute Contribution No. 180.
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Takahashi, M., Bienfang, P.K. Size structure of phytoplankton biomass and photosynthesis in subtropical Hawaiian waters. Mar. Biol. 76, 203–211 (1983). https://doi.org/10.1007/BF00392736
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DOI: https://doi.org/10.1007/BF00392736