Nutrient and Phytoplankton Dynamics in Harima-Nada, Eastern Seto Inland Sea, Japan During a 35-Year Period from 1973 to 2007
Nutrient and Phytoplankton Dynamics in Harima-Nada, Eastern Seto Inland Sea, Japan During a 35-Year Period from 1973 to 2007
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DOI：
10.1007/s12237-009-9198-0
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发表时间：
2010-03-01
影响因子：
2.7
通讯作者：
Tada, Kuninao
中科院分区：
文献类型：
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作者：
Nishikawa, Tetsuya;Hori, Yutaka;Tada, Kuninao
从1973年到2007年，在日本东部内陆海的Harima-Nada的19个采样点进行了长达35年的水质和浮游植物长期监测。有两个重大的长期变化，冬季水温上升了0.042a摄氏度(-1)，由于养分输入的减少，溶解无机氮(DIN)从20世纪70年代的约10亩M下降到90年代末的约5亩M。DIN浓度和浮游植物细胞总密度在20世纪70年代至80年代初均较高，然后在80年代中期显着下降，此后保持相对恒定。在35年的时间里，硅藻是占主导地位的浮游植物类群(90%)，在20世纪80年代中期，硅藻的优势从骨架藻(接近70%)转变为角毛藻。硅藻种类的这种转变可能归因于骨架藻和角毛藻生活史的不同以及对DIN浓度下降的反应。
Long-term monitoring of water quality and phytoplankton was conducted at 19 sampling stations in Harima-Nada, eastern Seto Inland Sea, Japan for 35 years from 1973 to 2007. There were two significant long-term changes, an increase in winter water temperatures of 0.042A degrees C year(-1), and a decrease in dissolved inorganic nitrogen (DIN) from about 10 mu M in the 1970s to similar to 5 mu M in the late 1990s due to the reduction in nutrient inputs. DIN concentrations and total phytoplankton cell density were both higher during the 1970s to the early 1980s and then exhibited a significant decrease in the mid 1980s and remained relatively constant thereafter. Diatoms were the dominant phytoplankton group (> 90%) over the 35-year period, and there was a dramatic shift from Skeletonema dominance (similar to 70%) to Chaetoceros in the mid 1980s. This shift in diatom species may be attributed to differences in the life cycle of Skeletonema and Chaetoceros and the response to the decrease in DIN concentration.