High frequency Barium profiles in shells of the Great Scallop Pecten maximus : a methodical long-term and multi-site survey in Western Europe
High frequency Barium profiles in shells of the Great Scallop Pecten maximus : a methodical long-term and multi-site survey in Western Europe
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大扇贝壳中的高频钡分布：西欧系统性的长期多地点调查
DOI：
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
O. Donard
中科院分区：
文献类型：
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作者：
A. Barats;D. Amouroux;L. Chauvaud;C. Pécheyran;A. Lorrain;J. Thébault;T. Church;O. Donard
抽象的。在西欧温带沿海环境中收集的大扇贝扇贝的 39 个扁平瓣膜中，每隔三天测量一次骨骼钡/钙 ([Ba]/[Ca]) 壳比率。首次对 ([Ba]/[Ca]) 贝壳比率进行了系统评估，结果表明 ([Ba]/[Ca]) 贝壳剖面对于来自同一群体（2 岁；3 个贝壳/年）、7 年期间（1998-2004）以及来自法国不同沿海环境（北纬 42-49°）的多个扇贝个体是可重复的。正如之前在其他双壳类物种的壳中测定的那样，([Ba]/[Ca])壳剖面通常表现出由夏初和夏末发生的两个瞬时最大值所打断的背景比。背景分配系数（DBa = 0.11±0.03，2000 年）与之前报道的大虾贝壳相似，表明贝壳直接吸收溶解的海水 Ba（Gillikin 等，2008）。在布雷斯特湾对扇贝壳中的高频（[Ba]/[Ca]）壳剖面进行了为期 7 年的调查，以更好地限制受环境过程影响的夏季 Ba 相对富集的发生和幅度。 2000 年海水 Ba 含量强调了 ([Ba]/[Ca]) 壳峰事件期间沉积物水界面 (SWI) 处的大量颗粒 Ba 输入。因此，这些 Ba 输入被认为是随后由远洋生物过程引起的，该过程主要发生在夏季花后条件下，与颗粒有机物和相关 Ba 的循环有关。长期调查表明，这种远洋 Ba 循环过程是导致沉积物水界面 (SWI) 颗粒 Ba 输入的原因。随后双壳类对 Ba 的间接吸收导致较高的 ([Ba]/[Ca]) 壳比，因为壳内存档的 Ba 不能用作直接的古生产力示踪剂。我们的方法基于对扇贝双壳类 ([Ba]/[Ca]) 壳比的多年和多地点调查，使我们能够建立这种高频档案的潜在应用，以进一步对沿海环境中的双壳类进行生物地球化学和生态调查。
Abstract. Skeletal barium/calcium ([Ba]/[Ca])shell ratios were measured every third daily striae in 39 flat valves of the Great Scallop Pecten maximus collected in temperate coastal environments of Western Europe. A methodical evaluation of the ([Ba]/[Ca])shell ratio was performed for the first time and demonstrates that ([Ba]/[Ca])shell profiles are reproducible for several scallop individuals from the same population (2-year old; 3 shells/year), over a 7-year period (1998–2004), and from different coastal environments in France (42–49° N). As previously determined in the shells of other bivalve species, ([Ba]/[Ca])shell profiles generally exhibited a background ratio punctuated by two transient maxima occurring in early and late summer. Background partition coefficient (DBa=0.11±0.03, in 2000) was similar to that previously reported in P. maximus shells, suggesting a direct shell uptake of dissolved seawater Ba (Gillikin et al., 2008). The 7-year survey in the Bay of Brest of the high frequency ([Ba]/[Ca])shell profiles in the scallop's shell was exploited to better constrain both the occurrence and the amplitude of the summer Ba relative enrichments as influenced by environmental processes. Seawater Ba contents in 2000 underlined significant particulate Ba inputs at the sediment water interface (SWI) during ([Ba]/[Ca])shell peak events. These Ba inputs are thus suggested to be subsequently induced by a pelagic biogenic process, which mainly occurs under summer post-bloom conditions in relationship to the cycling of particulate organic matter and associated Ba. The long term survey reveals that such pelagic Ba cycling processes are responsible for particulate Ba inputs to the sediment water interface (SWI). Subsequent indirect Ba uptake by the bivalve results in higher ([Ba]/[Ca])shell ratios, in that archived Ba within the shell cannot be used as a direct paleo productivity tracer. Our methodical approach, based on a multi-year and multi-site-survey of ([Ba]/[Ca])shell ratio in Scallop bivalves, allows us to establish the potential application of such high frequency archives for further biogeochemical and ecological investigations of bivalves in the coastal environment.