SWFSC Marine Mammal Survey, CADDIS 1995, Cruise 1601

Original provider: NOAA Southwest Fisheries Science Center (SWFSC) Dataset credits: Marine Mammal and Turtle Division, Southwest Fisheries Science Center, NMFS, NOAA Abstract: The Cetacean Acoustic Detection and Dive Interval Studies (CADDIS) survey was conducted by the NOAA Southwest Fisheries Science Center primarily in the southern Gulf of California aboard NOAA research ship McArthur from early September to early November 1995 for a total of approximately 6,000 kilometers surveyed. The project focused on two potential approaches to improve abundance estimates of long-diving whales: (1) acoustic detection of diving animals, and (2) collecting dive interval data on those species to serve as a basis for a model-based abundance correction factor. This dataset provides the time-date and geographical coordinates, by species/stock, of all cetaceans detected during the survey, as well as the daily and intra-daily start and end points of the line-transect survey. Purpose: The primary purpose of this research was to learn how to better estimate the abundance of long-diving whales during ship line-transect surveys. These whale species, including beaked whales and dwarf and pygmy sperm whales, dive for such long periods of time that there is a high probability that they will never surface within the visual range of observers searching from a moving survey vessel with 25X binoculars.

原始提供方：美国国家海洋和大气管理局（National Oceanic and Atmospheric Administration，NOAA）西南渔业科学中心（Southwest Fisheries Science Center，SWFSC）
数据集贡献单位：海洋哺乳动物与海龟分部、美国国家海洋和大气管理局西南渔业科学中心、国家海洋渔业局（National Marine Fisheries Service，NMFS）、美国国家海洋和大气管理局（NOAA）
摘要：鲸类声学探测与潜水间隔研究（Cetacean Acoustic Detection and Dive Interval Studies，CADDIS）调查由美国国家海洋和大气管理局西南渔业科学中心实施，主要作业区域为加利福尼亚湾南部，搭载调查船为NOAA“麦克阿瑟”号（McArthur）研究船，调查时段为1995年9月初至11月初，总调查航程约6000公里。本项目聚焦两种可提升长潜鲸类种群丰度估算精度的潜在方法：（1）潜水动物的声学探测；（2）采集目标物种的潜水间隔数据，以此作为构建基于模型的丰度校正因子的基础。本数据集提供了本次调查中探测到的所有鲸类按物种/类群划分的时间-日期信息与地理坐标，同时包含样线调查（line-transect survey）的单日及单日内部的作业起止点。
研究目的：本研究的核心目标是探索如何在船舶样线调查中更精准地估算长潜鲸类的种群丰度。此类鲸类包含喙鲸、矮抹香鲸与小抹香鲸，其潜水时长极长，在使用25倍双筒望远镜的移动观测船的视觉搜索范围内，它们几乎不会露出水面。