The NOAA IR serves as an archival repository of NOAA-published products including scientific findings, journal articles, guidelines, recommendations, or other information authored or co-authored by NOAA or funded partners.
As a repository, the NOAA IR retains documents in their original published format to ensure public access to scientific information.
i
Abundance of eastern North Pacific gray whales 2022/2023
-
2023
[PDF-1.22 MB]
Details:
-
Personal Author:
-
Corporate Authors:
-
NOAA Program & Office:
-
Description:The Southwest Fisheries Science Center (SWFSC) regularly conducts shore-based surveys of eastern North Pacific (ENP) gray whales (Eschrichtius robustus) to estimate abundance. These estimates are obtained from visual survey data collected off central California between December and February during the gray whale southward migration and provide regular updates to a time series of abundance estimates that began in 1967 (Laake et al. 2012, Durban et al. 2015). The estimated abundance in the 2015/2016 season was 26,960 whales (95%CI1 = 24,420-29,830; Table 1), indicating that the population had roughly doubled since 1967, when it was estimated at 13,426 whales (95% CI = 10,952-15,900; CV = 0.094). Since 2015/2016, however, the population declined to 20,580 whales (95% CI = 18,700-22,870) in 2019/2020 (Stewart and Weller 2021a) and 16,650 (95% CI = 15,170 - 18,335) in 2021/2022 (Eguchi et al. 2022a). This report presents a new estimate of abundance for ENP gray whales migrating southward off the central California coast between December 2022 and February 2023.
-
Keywords:
-
Series:
-
DOI:
-
Format:
-
Document Type:
-
License:
-
Rights Information:CC0 Public Domain
-
Compliance:Submitted
-
Main Document Checksum:
-
Download URL:
-
File Type:
