Position-dependent radiocarbon content of the macroalgae Undaria pinnatifida as an indicator of oceanographic conditions during algal growth
Position-dependent radiocarbon content of the macroalgae Undaria pinnatifida as an indicator of oceanographic conditions during algal growth
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DOI：
10.1007/s10872-019-00508-7
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发表时间：
2019-03
影响因子：
2.3
通讯作者：
N. Satoh;H. Fukuda;Y. Miyairi;Y. Yokoyama;T. Nagata
中科院分区：
文献类型：
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作者：
N. Satoh;H. Fukuda;Y. Miyairi;Y. Yokoyama;T. Nagata
在日本东北部太平洋沿岸的大槌湾，研究了大型棕色大型海藻裙带菜（Undaria pinnatifida）的放射性碳含量（~（14）C），作为藻类生长期间海洋环境的指标。在该区域，以高溶解无机碳（DIC）为特征的暖边界流和冷的亚北极亲潮流（低DIC）季节性流入海湾。我们假设，在U. pinnatifidapinalgae（小叶状结构出现顺序沿着垂直轴的叶片）的β 14 C值反映β 14 C-DIC值在光合生产过程中的海湾水。在U. pinnatifidativation期间（2013年11月至2014年4月），Oyashio入侵发生在3月上旬至4月上旬，伴随着海湾水14 C-DIC从15.7 ± 8.6‰下降到− 57.1 ± 20.7‰。3月上旬形成的松质藻的δ 14 C含量（3.0 ± 5.4‰）显著高于4月上旬形成的松质藻（-23.6 ± 7.5‰），反映了δ 14 C-DIC。这些结果表明，U. pinnatifidapinarum的δ 14 C可以作为藻类生长期间Oyashio入侵海湾的记录。
The radiocarbon content (∆14C) of the large brown macroalgaUndaria pinnatifidawas investigated as an indicator of oceanographic conditions during algal growth in Otsuchi Bay on the Pacific coast of northeastern Japan. In this region, warm boundary currents characterized by high dissolved inorganic carbon (DIC) ∆14C and cold subarctic Oyashio Current (low ∆14C-DIC) flow into the bay seasonally. We hypothesized that ∆14C values inU.pinnatifidapinnae (leaflet-like structures arising sequentially along the vertical axis of the blade) reflect ∆14C-DIC values in bay water during photosynthetic production. During theU.pinnatifidacultivation period (November 2013–April 2014), the Oyashio intrusion occurred from early March to early April, accompanied by a decrease in bay water ∆14C-DIC, from 15.7 ± 8.6‰ to − 57.1 ± 20.7‰. The ∆14C of the pinnae reflected ∆14C-DIC, as pinnae that formed in early March had significantly higher ∆14C (3.0 ± 5.4‰) than those that formed in early April (− 23.6 ± 7.5‰). These results indicate that the ∆14C ofU.pinnatifidapinnae can serve as a record of Oyashio intrusion into the bay during algal growth.