Population estimation of the bottlenose dolphin
宽吻海豚的种群估计
基本信息
- 批准号:07836010
- 负责人:
- 金额:$ 1.47万
- 依托单位:
- 依托单位国家:日本
- 项目类别:Grant-in-Aid for Scientific Research (C)
- 财政年份:1995
- 资助国家:日本
- 起止时间:1995 至 1996
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
The bottlenose dolphin (Tursiops truncatus) is found throughout the year in the waters near Tsujishima island, Amakusa, Kyushu, Japan. Recently number of watching boats have increased in the waters. It is now suspected that their approaching to the dolphins may some bad effects on this wild animal. The objective of this study is to obtain ecological information associated with conservation and management of the Tsujishima bottlenose dolphin population.Theodolite tracking was carried out on the hill of Tsujishima island. Number of the dolphin schools was commonly one. The dolphin school moved longitudinally in parallel with coast lines. Its occurrence concentrated in the waters off 1-2 km from the shore and of depth less than 20m. A regular diurnal pattern in its movement was recognized, that is, it moves in the eastern part of the waters in the morning, stays in front of the island near noon, and moves westward near sunset.Photo-identification was attempted using notches of the dorsal fin. A total of 192 individuals was identified. Some of them resighted in every season and some of them resighted continuously in 9 seasons. In consideration that the school was found on all the days of theodolite survey and that no information on common findings was available in adjacent waters, the dolphins occurring in the Tsujishima island waters constitute a resident population.Population size was estimated by a capturerecapture method. Preliminary estimates by month ranged 201-323 individuals (cv : 11.4-22.9%)
短吻海豚(Tursiops truncatus)全年都在日本九州岛阿马库萨的Tsujishima岛附近的沃茨被发现。最近,在沃茨观察船只的数量有所增加。现在人们怀疑他们接近海豚可能会对这种野生动物产生不良影响。本研究的目的是为了获得与岛海豚种群的保护和管理相关的生态信息,在岛的山上进行了经纬仪跟踪。海豚群的数量一般为一个。海豚群沿着与海岸线平行的纵向移动。主要分布在距海岸1- 2km的沃茨,水深小于20 m。它的运动具有一定的日变化规律,即上午在沃茨东部运动,中午在岛前停留,日落时向西运动。共查出192人。有的在每个季节都进行了再访,有的在9个季节连续进行了再访。考虑到在经纬仪调查的所有日子里都发现了海豚群,并且在邻近的沃茨中没有共同发现的信息,因此,出现在Tsujishima岛沃茨的海豚构成了一个常住种群。按月份的初步估计数为201-323只(变异系数:11.4-22.9%)
项目成果
期刊论文数量(0)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
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SHIRAKIHARA Kunio其他文献
SHIRAKIHARA Kunio的其他文献
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{{ truncateString('SHIRAKIHARA Kunio', 18)}}的其他基金
Estimating detection probability and population changes for conservation of finless porpoises
估计江豚保护的检测概率和种群变化
- 批准号:
21380120 - 财政年份:2009
- 资助金额:
$ 1.47万 - 项目类别:
Grant-in-Aid for Scientific Research (B)
Finless porpoise (Neophocaena phocaenoides)- habitat modellingfor its conservation
江豚 (Neophocaena phocaenoides) - 保护栖息地模型
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19580201 - 财政年份:2007
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$ 1.47万 - 项目类别:
Grant-in-Aid for Scientific Research (C)
Conservation Ecology of Indo-Pacific bottlenose dolphins in Amakusa, western Kyushu, Japan
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- 批准号:
13660182 - 财政年份:2001
- 资助金额:
$ 1.47万 - 项目类别:
Grant-in-Aid for Scientific Research (C)
Development of monitoring systems for studying ecology and behavior of bottlenose dolphins-taking aerial pictures of schools using a captive balloon system and recording underwater vocalizations using a sonobuoy system-
开发用于研究宽吻海豚生态和行为的监测系统——使用系留气球系统拍摄学校的航拍照片并使用声纳浮标系统记录水下发声——
- 批准号:
10460086 - 财政年份:1998
- 资助金额:
$ 1.47万 - 项目类别:
Grant-in-Aid for Scientific Research (B).
Population ecology of the finless porpoise
江豚种群生态学
- 批准号:
05660213 - 财政年份:1993
- 资助金额:
$ 1.47万 - 项目类别:
Grant-in-Aid for General Scientific Research (C)
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