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首页> 外文学位 >Blue whale (Balaenoptera musculus) vocalizations recorded in the North Pacific Ocean: Geographic, seasonal and diel variation.
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Blue whale (Balaenoptera musculus) vocalizations recorded in the North Pacific Ocean: Geographic, seasonal and diel variation.

机译：在北太平洋记录的蓝鲸（Balaenoptera musculus）发声：地理，季节和diel变化。

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摘要

The objective of this research was to improve our understanding of blue whale distribution and seasonality by use of acoustic detection of blue whale vocalizations. Blue whale vocalizations are long (>15 s), low-frequency (∼20 Hz) sounds that are often repeated in stereotypic patterns. Recordings from hydrophones located in the North Pacific were examined for the presence of known blue whale sounds in order to assess geographic, seasonal and diel variation within these patterns. This effort began with an acoustic survey of the eastern tropical Pacific (ETP) to document the acoustic presence of low-frequency whale sounds. Two call types that have been attributed to blue whales were detected often and these different types appear to represent northern and southern hemisphere populations. Another broad survey was undertaken but rather than enumerate the showed similar seasonal patterns in the North Pacific but east-west geographic differences. The last survey in this study compared data on a north-south basis to study the acoustic range of the northeastern Pacific call type. This call type is recorded in the northeast Pacific from Vancouver Island, Canada to the equator. It is possible that this call type represents a unique population of blue whales that migrate along the west coast of North America. A closer examination of vocalizing behavior in blue whales was undertaken to study whether or not there is diel variation in blue whale calls in the ETP. More blue whale calls were detected during twilight and dark hours than during light hours.
机译：这项研究的目的是通过使用蓝鲸发声的声学检测来增进我们对蓝鲸分布和季节性的了解。蓝鲸发声很长（> 15 s），低频（〜20 Hz），通常以定型模式重复出现。检查了位于北太平洋的水听器的记录中是否存在已知的蓝鲸声音，以便评估这些模式中的地理，季节和diel变化。这项工作始于对东部热带太平洋（ETP）的声学调查，以记录低频鲸鱼声音的声学存在。经常发现两种归因于蓝鲸的呼叫类型，这些不同类型似乎代表北半球和南半球的种群。进行了另一项广泛的调查，但没有列举北太平洋显示的相似的季节性模式，但东西向的地理差异。本研究中的最后一项调查以南北为基础对数据进行了比较，以研究东北太平洋呼唤类型的声学范围。此呼叫类型记录在从加拿大温哥华岛到赤道的东北太平洋中。这种呼叫类型可能代表了在北美西海岸迁移的独特蓝鲸种群。仔细检查了蓝鲸的发声行为，以研究ETP中蓝鲸鸣叫是否存在diel变化。在暮色和黑暗时间检测到的蓝鲸鸣叫次数要多于光明时间。

著录项

  • 作者

    Stafford, Kathleen Mary.;

  • 作者单位

    Oregon State University.;

  • 授予单位 Oregon State University.;
  • 学科 Biology Oceanography.
  • 学位 Ph.D.
  • 年度 2001
  • 页码 149 p.
  • 总页数 149
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 海洋生物;
  • 关键词

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