Population ecology of the finless porpoise

江豚种群生态学

基本信息

  • 批准号:
    05660213
  • 负责人:
  • 金额:
    $ 1.09万
  • 依托单位:
  • 依托单位国家:
    日本
  • 项目类别:
    Grant-in-Aid for General Scientific Research (C)
  • 财政年份:
    1993
  • 资助国家:
    日本
  • 起止时间:
    1993 至 1994
  • 项目状态:
    已结题

项目摘要

This project aimed to estimate the ecological parameters of the finless porpoise (Neophocaena phocaenoides) populations in the coastal waters near Nagasaki by analysing photos taken from an airplane, examining specimens, and sighting surveys from the plane and boats.A total of photos for 46 individuals were taken. Estimates of body length ranged from 0.7 to 2.2m. Using these photos, the population size in Ariake Sound and Tachiban Bay was estimated to be more than 800 individuals. From airo sighting surveys, another estimate for this population was 3093 individuals.A paper was published on distribution and seasonal density evaluated from the boat sighting surveys. In the coastal waters near Nagasaki, the species is distributed mainly in Ariake Sound, Tachibana Bay and Omura Bay. Density was estimated 1.31-1.60 individuals/km^2 in the middle part of Ariake Sound. The mean school size was 1.7 individualsA paper was publised on age, growth and reproduction. The species is born at length of 80 cm and grows up to 140 cm at age of 5 years old. Females attain sexual maturity at ages of 6-9 years. Parturition near Nagasaki is from autumn spring.Two papers were published on morphology of skeltons. One describes development with age and sexual dimorphism. The other attempted to identify stocks based on geographical difference in the skull morphology. This species attains cranial maturity by 4 years. Sexual dimorphism was not detectable in most of cranial characters. We suggested two stocks exist in the coastal waters near Nakasaki, that is, Ariake Sound-Tachibana Bay stock and Omura Bay stock.
通过对长崎附近沿海沃茨的江豚(Neophocaena phocaenoides)进行飞机照片分析、标本检查、飞机和船只的观察调查,对江豚种群的生态参数进行了估算。体长估计为0.7至2.2米。根据这些照片,估计有明海峡和立番湾的种群数量超过800只。根据航空目击调查,这一种群的另一个估计是3093个个体。在长崎附近的沿海沃茨,主要分布在有明湾、立花湾和大村湾。有明湾中部的密度估计为1.31-1.60只/km^2。平均学校规模为1.7人。该物种出生时身长80厘米,5岁时可长至140厘米。女性在6-9岁时达到性成熟。在长崎附近的分娩是从秋天到春天。一种描述了随着年龄和性二型性的发展。另一个试图根据头骨形态的地理差异来识别种群。该物种在4年前达到头骨成熟。多数颅骨性状未见两性异形。我们认为,在中崎附近的沿海沃茨存在两个种群,即有明湾立花湾种群和大村湾种群。

项目成果

期刊论文数量(20)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Shirakihara et al: "Age,growth,and reproduction of the finless porpoise in the coastal waters of western Kyushu,Japan" Marine Mammal Science. 9. 392-406 (1993)
白木原等人:“日本九州西部沿海水域江豚的年龄、生长和繁殖”海洋哺乳动物科学。
  • DOI:
  • 发表时间:
  • 期刊:
  • 影响因子:
    0
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  • 通讯作者:
Yoshida,H.et al.: "Geographic varialion in the skull morphoiogy of the finless porpoise,Neophocaena phocaenoides,in the Japanese waters" Fisheries Science. (in press).
Yoshida, H.et al.:“日本水域江豚头骨形态的地理变异”渔业科学。
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    0
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  • 通讯作者:
Yoshida,H.et al.: "Development, sexual dimorphism,and individual variation in the skelton of the finless porpoise,Neophocaena phocaenoides, in the coastal waters of western Kyushu,Japan" Marine Mammal Science. 10. 266-282 (1994)
Yoshida, H.et al.:“日本九州西部沿海水域江豚骨骼的发育、性别二态性和个体变异”海洋哺乳动物科学。
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  • 影响因子:
    0
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Shirakihara,M.et al.: "Distribution and seasonal density of the finless porpolse,Neophocaena phocaenoides,in the coastal waters of western kyushu,Japan" Fisheries Science. 60. 41-46 (1994)
Shirakihara,M.et al.:“日本九州西部沿海水域无鳍江豚的分布和季节性密度”渔业科学。
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  • 影响因子:
    0
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  • 通讯作者:
Yoshida,H.et al.: "Development sexual dimorphism,and individual variation in the skelton of the tiniess porpoise,Neophocaena phocaennoides,in the coastal waters of western kyushu,Japan" Marine Mammal Science. 10. (1994)
Yoshida, H.et al.:“日本九州西部沿海水域小江豚(Neophocaena phocaennoides)骨骼的发育性别二态性和个体变异”海洋哺乳动物科学。
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    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:
    $ 1.09万
  • 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
  • 批准号:
    19580201
  • 财政年份:
    2007
  • 资助金额:
    $ 1.09万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
Conservation Ecology of Indo-Pacific bottlenose dolphins in Amakusa, western Kyushu, Japan
日本九州西部天草的印度太平洋宽吻海豚的保护生态
  • 批准号:
    13660182
  • 财政年份:
    2001
  • 资助金额:
    $ 1.09万
  • 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:
    $ 1.09万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B).
Population estimation of the bottlenose dolphin
宽吻海豚的种群估计
  • 批准号:
    07836010
  • 财政年份:
    1995
  • 资助金额:
    $ 1.09万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)

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  • 批准号:
    23K05361
  • 财政年份:
    2023
  • 资助金额:
    $ 1.09万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
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