Survey of the Lotus Root Habitats in the Sediment Using Acoustic Coring System
Survey of the Lotus Root Habitats in the Sediment Using Acoustic Coring System
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利用声波取芯系统调查沉积物中的莲藕栖息地
DOI：
10.1109/oceanskobe.2018.8559081
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
Shimada Tetsuo
中科院分区：
文献类型：
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作者：
Mizuno Katsunori;Yu Zhang;Murakoshi Makoto;Suganuma Hiroki;Asada Akira;Fujimoto Yasufumi;Takahashi Yusuke;Shimada Tetsuo
荷花植物（Nelumbo nuciferaGaertn.）是一种水生新兴被子植物，分布于湿地。在日本，荷花广泛分布于日本富营养化水域。出沼湖以荷花为主的湖泊占很大比例，荷花覆盖的湖泊面积有所增加。该湖于1985年根据拉姆萨尔公约被登记为湿地，因此非常需要保护该湖的生物多样性。出云-内沼湖也被指定为国家鸟类和动物保护区，是日本最著名的大天鹅和鹅的越冬地之一。此外，在调查区域经常观察到大天鹅的觅食行为。因此，莲藕是大天鹅越冬的重要食物，湖中的莲藕分布影响着大天鹅的行为。然而，荷花植物通常是在水底下靠藕的营养繁殖生长，只有挖出藕才能清楚荷花分布的真实情况。为了克服这些问题，我们开发了一种新的监测系统，名为“声学取心系统”[4]。本研究利用声学取心系统对沉积物中的藕生境进行监测，研究了大天鹅越冬期间的藕分布情况和觅食压力。
The lotus plant (Nelumbo nuciferaGaertn.) is an aquatic emergent angiosperm that is distributed in wetlands. In Japan, the lotus is widely distributed in Japanese eutrophic waters [1]. A large proportion of Lake Izunuma has been dominated by lotus, and the area of the lake covered by lotus has increased. The lake was registered as a wetland under the Ramsar Convention in 1985, and therefore, there is a great need to conserve the biodiversity at the lake. Lake Izunuma-Uchinuma is also designated as a National Bird and Animal Protection Region, and it is one of the most famous wintering grounds for whooper swans and geese in Japan [2]. Additionally, foraging behavior of whooper swans was observed often at the survey areas. Therefore, the lotus root is important food for the whooper swans during overwinter and the lotus distribution in the lake affects their behavior [3]. However, the lotus plant usually grows by vegetative reproduction of the lotus root under the water bottom, and the real situation of the lotus distribution is not clear unless the lotus root is dug up. To overcome the problems, we have developed a new monitoring system, named “acoustic coring system” [4]. In this study, the lotus root habitats in the sediment is monitored using the acoustic coring system to investigate the lotus root distribution and estimate the foraging pressure of whooper swan during overwinter.