Long-term change in water transparency before and after the loss of eelgrass beds in an estuarine lagoon, Lake Nakaumi, Japan
Long-term change in water transparency before and after the loss of eelgrass beds in an estuarine lagoon, Lake Nakaumi, Japan
复制标题
日本中海湖河口泻湖鳗草床消失前后水体透明度的长期变化
DOI：
10.1007/s10201-006-0198-5
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发表时间：
2007
期刊：
影响因子：
1.6
通讯作者：
Yu Ishitobi
中科院分区：
文献类型：
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作者：
J. Hiratsuka;M. Yamamuro;Yu Ishitobi
长期的变化Secchi磁盘透明度在日本湖Nakaumi，从1932年到现在，其中包括之前和之后的时间损失的大叶藻（Zostera marinaL.）床，是从以前的报告编制。在第一（1932年7月至1934年2月）和第二（1949年1月至1950年11月）期间，所有观测站的平均透明度均大于3米。第三个时期（1954年7月至1956年3月）的数据仅可用于湖中心的车站。第三阶段的平均透明度显著低于第二阶段，但高于第四阶段的平均值。这一观察结果表明，透明度的下降发生在第三个时期。由于中海湖鳗草床的减少发生在20世纪50年代中期，因此透明度的下降很可能是由于初级生产者从沉水植物转向浮游植物造成的。虽然最大透明度有时超过3米，在第四个时期（1975年5月至2003年12月）的平均反射率小于2米，在所有站，显着低于第一和第二时期。主要初级生产者从底栖大型植物向浮游植物的转变，引起了次级生产者随后的转变。机会主义的滤食性双壳类Musculista senhousia，被认为是当地渔业的生物污损物种，增加了在湖Nakaumi。透明度的长期监测数据表明，沉水植被的恢复可能是必不可少的修复湖泊环境在这个浅富营养化泻湖。
Long-term changes in Secchi disk transparency in Lake Nakaumi, Japan, from 1932 to the present, which includes the periods before and after the loss of eelgrass (Zostera marinaL.) beds, were compiled from previous reports. During the first (July 1932–February 1934) and the second (January 1949–November 1950) periods, the mean transparency was greater than 3 m at all observed stations. Data during the third period (July 1954–March 1956) are only available for the station at the center of the lake. The mean transparency during the third period was significantly lower than that of the second period but higher than the mean during the fourth period. This observation suggests that the decrease of transparency occurred during the third period. Because the decline of eelgrass beds in Lake Nakaumi occurred in the mid-1950s, the decrease of transparency most likely resulted from the shift in primary producers from submerged macrophytes to phytoplankton. Although the maximum transparency sometimes exceeded 3 m, mean transparencies during the fourth period (May 1975–December 2003) were less than 2 m at all stations, significantly lower than those during the first and second periods. The shift in the chief primary producer, from benthic macrophytes to phytoplankton, caused a subsequent shift in secondary producers. The opportunistic filter-feeding bivalveMusculista senhousia, regarded as a biofouling species of local fisheries, increased in Lake Nakaumi. The long-term monitoring data of transparency suggested that restoration of submerged aquatic vegetation may be indispensable for the remediation of the lake environment in this shallow eutrophic lagoon.
日本中海泻湖的水生孢粉类动物。
DOI：
--
发表时间：
2021
期刊：
影响因子：
--
作者：
Takuto Ando;Kazumi Matsuoka;Koji Seto;Yoshiki Saito
通讯作者：
Yoshiki Saito