Abundance estimates of cetaceans from a line-transect survey within the U.S. Hawaiian Islands Exclusive Economic Zone
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چکیده
منابع مشابه
Accounting for Subgroup Structure in Line-Transect Abundance Estimates of False Killer Whales (Pseudorca crassidens) in Hawaiian Waters
For biological populations that form aggregations (or clusters) of individuals, cluster size is an important parameter in line-transect abundance estimation and should be accurately measured. Cluster size in cetaceans has traditionally been represented as the total number of individuals in a group, but group size may be underestimated if group members are spatially diffuse. Groups of false kill...
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A method is developed to account for effects of animal movement in response to sighting platforms in line transect density estimates using data on animal orientation. Models of expected distributions of animal orientation show that presence of responsive movement is determined by the ratio of animal sightings with angles of orientation in the third quadrant relative to the first quadrant. The d...
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1 Department of Geography and Environment, Romberg Tiburon Center for Environmental Studies, San Francisco State University, Tiburon, CA, USA, 2 Wildlife Conservation Society, Bronx, NY, USA, 3 Department of Marine and Coastal Resources, Eastern Marine and Coastal Resources Research Center, Rayong, Thailand, 4 Institute of Ocean and Earth Sciences, University of Malaya, Kuala Lumpur, Malaysia, ...
متن کاملThe Effect of Animal Movement on Line Transect Estimates of Abundance
Line transect sampling is a distance sampling method for estimating the abundance of wild animal populations. One key assumption of this method is that all animals are detected at their initial location. Animal movement independent of the transect and observer can thus cause substantial bias. We present an analytic expression for this bias when detection within the transect is certain (strip tr...
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ژورنال
عنوان ژورنال: Fishery Bulletin
سال: 2017
ISSN: 0090-0656
DOI: 10.7755/fb.115.2.1