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首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >New insight into light-enhanced calcification in mytilid mussels, Mytilus sp., infected with photosynthetic algae Coccomyxa sp.: δ~(13)C value and metabolic carbon record in shells
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New insight into light-enhanced calcification in mytilid mussels, Mytilus sp., infected with photosynthetic algae Coccomyxa sp.: δ~(13)C value and metabolic carbon record in shells

机译：对光合藻科球孢菌感染的贻贝贻贝的光增强钙化的新见解：壳中的δ〜（13）C值和代谢碳记录

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摘要

The posterior shell edge (PSE) of wild mytilid mussels that are highly infected with unicellular photosynthetic green algae Coccomyxa sp. exhibits an extra shell material (ESM). A recently proposed mechanism of ESM formation shows similarity with light-enhanced calcification (LEC), i.e., algae photosynthesis mediates low respiratory CO2 level in shell calcification site (PSE) to promote ESM precipitation. The present study evaluates if infection with algae may affect the delta C-1(3) content and metabolic carbon (C-M) contribution to shells (PSE) in mussels from the Lower St. Lawrence Estuary, Quebec, Canada. Environmental conditions may influence shell delta C-13 records. To underline possible algae photosynthesis effects, mantle, adductor muscle and shell delta C-13 are analyzed in infected and non-infected mussels collected from two sites with different salinities, seawater dissolved inorganic carbon (DIC) content, and hydrodynamic regimes. Shell delta C-13 and tissue delta C-13 correlate with seawater DIC and salinity. Shell delta C-13 values are lowest in non-infected mussels, whereas tissues delta C-13 values show the opposite relationship; in both cases, differences between delta C-13 values in non-infected and infected mussels are about 0.5 parts per thousand. The percentage of C-M incorporated into shell is higher (ca. 18%) for non-infected mussels than infected mussels (ca. 15%). Literature on the subject suggests that increased delta C-13 content and decreased %C-M in shells of infected mussels must be related to algal photosynthetic activity. Our findings show that shell delta C-13 records permit the interpretation of ESM formation via LEC.
机译：野生的贻贝贻贝的后壳边缘（PSE）被单细胞光合绿藻Coccomyxa sp高度感染。展示了额外的外壳材料（ESM）。最近提出的ESM形成机理显示出与光增强钙化（LEC）相似，即藻类光合作用介导壳钙化位点（PSE）的呼吸CO2水平低，以促进ESM沉淀。本研究评估了藻类感染是否会影响加拿大魁北克下圣劳伦斯河口贻贝中的三角洲C-1（3）含量和代谢碳对壳（PSE）的贡献。环境条件可能会影响壳牌三角洲C-13记录。为了强调可能的藻类光合作用，分析了从两个盐度不同，海水溶解的无机碳（DIC）含量和水动力机制不同的地点收集的受感染和未感染的贻贝的地幔，内收肌和壳三角洲C-13。贝壳δC-13和组织δC-13与海水DIC和盐度相关。在未感染的贻贝中，壳delta C-13值最低，而组织delta C-13值显示相反的关系。在这两种情况下，未感染贻贝和已感染贻贝的δC-13值之间的差异约为千分之0.5。对于未感染的贻贝，掺入壳中的C-M百分比（约18％）要高于受感染的贻贝（约15％）。关于该主题的文献表明，受感染贻贝的壳中δC-13含量的增加和％C-M的降低必须与藻类的光合作用活性有关。我们的发现表明，壳层C-13记录可以通过LEC解释ESM的形成。

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