Temporal variations in transparent exopolymer particles (TEP) associated with a diatom spring bloom in a subarctic ria in Japan
Temporal variations in transparent exopolymer particles (TEP) associated with a diatom spring bloom in a subarctic ria in Japan
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DOI：
10.3354/meps212079
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发表时间：
2001-03
影响因子：
2.5
通讯作者：
N. Ramaiah;T. Yoshikawa;K. Furuya
中科院分区：
文献类型：
--
作者：
N. Ramaiah;T. Yoshikawa;K. Furuya
透明外聚合物颗粒（TEP）的时间变化进行了研究，在春季水华（1998年1月至4月）在亚北极地区的日本东北海岸。从二月中旬开始，硅藻占主导地位。在3月的第一周和最后一周记录了两个主要峰值，在此期间叶绿素浓度达到最大值12 µg l-1。TEP浓度在第一个峰值后急剧增加，开花前平均值为901，上升到1442 µg黄原胶当量。l-1。最大TEP值为2321 µg黄原胶当量。l-1与第二次水华高峰相吻合。在这个峰值之后，TEP浓度继续相对较高。颗粒物的数量在1 ~ 3.4 × 10 5 ml-1（尺寸= 4 ~ 520 µm）之间波动，随着水华的减少，小尺寸颗粒物的数量增加。TEP浓度在这个海湾要高得多（平均。1344 µg黄原胶当量l-1）比其他地方报告的（avg. 147至308 µg黄原胶当量l-1）。虽然在水华之后，总环境污染物大量增加，但值得注意的是，尽管叶绿素浓度较低，但水华前的浓度却很高。这意味着除了浮游植物外，还有其他来源的分泌物导致TEP的形成。实验室实验证实了我们的假设，即显著高的背景TEP是由于在该海湾商业化种植的大型裙带菜释放的细胞外分泌物中额外形成这些颗粒。因此，除了首次提供来自日本亚北极沿海沃茨的信息外，我们的研究还证实了大型藻类分泌物作为形成TEP的重要额外来源的作用。
Temporal variations in transparent exopolymer particles (TEP) were studied during a spring bloom (January to April 1998) in a subarctic ria on the northeast coast of Japan. A diatom- dominated bloom developed from mid-February. Two major peaks were recorded in the first and last week of March, during which chlorophyll concentrations reached the maximum of 12 µg l -1 . The TEP concentration increased sharply after the first peak, the pre-bloom average of 901 rising to 1442 µg xanthan equiv. l -1 . The maximum TEP value of 2321 µg xanthan equiv. l -1 recorded at the surface coincided with the second bloom peak. After this peak, TEP concentration continued to be relatively high. The number of particles fluctuated between 1 and 3.4 〈 10 5 ml -1 (size = 4 to 520 µm) with an increase in small-sized particles following the bloom decline. TEP concentrations in this bay were much higher (avg. 1344 µg xanthan equiv. l -1 ) than reported elsewhere (avg. 147 to 308 µg xanthan equiv. l -1 ). Although TEP increased considerably following the bloom, it was interesting to note the high pre-bloom concentrations despite low chlorophyll concentrations. This implied that a source other than phytoplankton was responsible for the release of exudates leading to TEP formation. Lab- oratory experiments confirmed our assumption that the significantly high background TEP was due to the additional formation of these particles from the extracellular exudates released by the macroalga Undaria pinnatifida, cultivated commercially in this bay. Thus, besides providing infor- mation from the subarctic coastal waters of Japan for the first time, our study also confirms the role of macroalgal exudates as an important additional source for the formation of TEP.