Algal concentration profiles above mussel beds |
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| Affiliation: | 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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