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Relationship between oxygen concentration, respiration and filtration rate in blue mussel Mytilus edulis

Journal of Oceanology and Limnology 2018年第2期36卷 395-404页

作者： TANG Baojun Hans Ulrik RIISGARD Marine Biological Research Centre University of Southern Denmark Hindsholmvej 11 DK-5300 Kerteminde Denmark East China Sea Fisheries Research Institute Chinese Academy of Fishery Sciences Shanghai 200090 China

The large water-pumping and particle-capturing gills of the filter-feeding blue mussel Mytilus edulis are oversized for respiratory purposes. Consequently, the oxygen uptake rate of the mussel has been suggested to be rather insensitive to decreasing oxygen concentrations in the ambient water, since the diffusion rate of oxygen from water flowing through the mussel determines oxygen uptake. We tested this hypothesis by measuring the oxygen uptake in mussels exposed to various oxygen concentrations. These concentrations were established via N2-bubbling of the water in a respiration chamber with mussels fed algal cells to stimulate fully opening of the valves. It was found that mussels exposecl to oxygen concentrations decreasing from 9 to 2 mg O2/L resulted in a slow but significant reduction in the respiration rate, while the filtration rate remained high and constant. Thus, a decrease of oxygen concentration by 78% only resulted in a 25% decrease in respiration rate. However, at oxygen concentrations below 2 mg O2/L M. edulis responded by gradually closing its valves, resulting in a rapid decrease of filtration rate, concurrent with a rapid reduction of respiration rate. These observations indicated that M. edulis is no longer able to maintain its normal aerobic metabolism at oxygen concentration below 2 mg O2/L, and there seems to be an energy-saving mechanism in bivalve molluscs to strongly reduce their activity when exposed to low oxygen conditions.

关键词： Mytilus edulis filtration rate respiration rate oxygen concentration valve-opening degree

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In Situ Filtration Rates of Blue Mussels(Mytilus edulis)Measured by an Open-Top Chamber Method

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Open Journal of Marine Science 2018年第4期8卷 395-406页

作者： Florian Lüskow Hans Ulrik Riisgard Department of Earth Ocean and Atmospheric SciencesUniversity of British ColumbiaVancouverCanada Marine Biological Research Centre Department of BiologyUniversity of Southern DenmarkKertemindeDenmark

Blue mussels, Mytilus edulis , form dense beds of both commercial and ecological importance, and many attempts have been made to determine their filtration rate. The total time in which mussels actually utilise their filtration capacity in nature varies greatly, making in situ methods for filtration rate measurements relevant. Further, it is being debated to what extend filtration rates measured in the laboratory using cultivated algal cells may apply for mussels in nature. In the present study, we have used an open-top chamber setup in order to allow repeated in situ filtration rate measurements of M. edulis using ambient natural phytoplankton and free-living bacteria. We found that the in situ measured filtration rates are comparable to filtration rates obtained in laboratory studies using different methods and controlled diets of cultivated algal cells. Further, we found that the retention efficiency of free-living bacteria was between 22.2% and 29.9%, in good agreement with values from laboratory studies. Our findings support the assumption that mussels in nature tend to use their filtration capacity when the phytoplankton concentration is above a certain lower trigger level.

关键词： Bivalvia Filter-Feeding Zoobenthos valve-opening degree Cultivated Algal Cells Free-Living Bacteria Particle Retention Efficiency

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