Algal concentration profiles above mussel beds |
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| Institution: | 1. DMA, Universidade Federal do Espírito Santo, São Mateus, ES, Brazil;2. LNCC, Laboratório Nacional de Computação Científica, Petrópolis, RJ, Brazil;3. DI, Universidade Federal do Espírito Santo, Vitória, ES, Brazil;1. LCAD, Universidade Federal do Espírito Santo, Vitória, ES, Brazil;2. DMA, Universidade Federal do Espírito Santo, São Mateus, ES, Brazil;3. LNCC, Laboratório Nacional de Computação Científica, Petrópolis, RJ, Brazil;4. NACAD, Programa de Engenharia Civil, COPPE, Universidade Federal do Rio de Janeiro, RJ, Brazil |
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| Abstract: | The distribution of phytoplankton was measured in vertical profiles at three stations in Limfjorden (Denmark) within and above Mytilus edulis beds (?5 to 200 cm above the bed surface) and related to the filtration capacity of the mussels and hydrodynamic conditions. The density of phytoplankton was 2690 to 10 600 cells cm?3 at 200 cm above the bottom (～1.4 to 3.2 mg Chl-a m?3), declining towards the bottom to about 1000 cells cm?3 at two of the stations. This is a threshold of minimum algal concentration below which mussels are reported to stop feeding. The results of the present study further demonstrate that the near-bed phytoplankton concentrations observed in the field often remained below the concentration level at which mussels reduce their maximal filtration activity. |
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