Item Identification

Title: Abundance estimates of cetaceans from a line-transect survey in the U.S Hawaiian Islands Exclusive Economic Zone
Status: Completed
Publication Date: 2017-01-19

A ship-based line-transect survey was conducted during the summer and fall of 2010 to obtain abundance estimates of cetaceans in the U.S. Hawaiian Islands Exclusive Economic Zone (EEZ). Given the low sighting rates for cetaceans in the study area, sightings from 2010 were pooled with sightings made during previous line-transect surveys with-in the central Pacific for calculating detection functions, which were estimated by using a multiple-covariate approach. The trackline detection probabilities used in this study are the first to reflect the effect of sighting conditions in the central Pacific and are markedly lower than estimates used in previous studies. During the survey, 23 cetacean species (17 odontocetes and 6 mysticetes) were seen, and abundance was estimated for 19 of them (15 odontocetes and 4 mysticetes). Group size and Beaufort sea state were the most important factors affecting the detectability of cetacean groups. Across all species, abundance estimates and coefficients of variation range from 133 to 72,528 and from 0.29 to 1.13, respectively. Estimated abundance is highest for delphinid species and lowest for the killer whale (Orcinus orca) and rorqual species. Overall, cetacean density in the Hawaiian Islands EEZ is low in comparison with highly productive oceanic regions.

Other Citation Details:

Bradford, A.L., K.A. Forney, E.M. Oleson, J. Barlow. 2017. Abundance estimates of cetaceans from a line-transect survey in the U.S Hawaiian Islands Exclusive Economic Zone. Fishery Bulletin. 11(2):129-142. doi: 10.7755/FB.115.2.1

Physical Location

Organization: Pacific Islands Fisheries Science Center
City: Honolulu
State/Province: HI
Country: USA

Document Information

Format: Adobe Portable Document Format
Status Code: Published


Currentness Reference: Publication Date

Access Information

Security Class: Unclassified



CC ID: 387771

Published paper.

Catalog Details

Catalog Item ID: 30992
Metadata Record Created By: Erin M Oleson
Metadata Record Created: 2016-03-02 19:10+0000
Metadata Record Last Modified By: Erin M Oleson
Metadata Record Last Modified: 2020-05-12 23:31+0000
Metadata Record Published: 2017-03-09
Owner Org: PIFSC
Metadata Publication Status: Published Externally
Do Not Publish?: N
Metadata Next Review Date: 2018-03-10