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Title: Preliminary Mark-Recapture Abundance Estimates of Humpback Whales on a Breeding Area in the Mariana Archipelago
Status: Completed
Publication Date: 2020-06
Abstract:

The Pacific Islands Fisheries Science Center conducted small-boat surveys for endangered Western North Pacific humpback whales off Saipan and neighboring islands in the Mariana Archipelago during the winter months of 2015 to 2019. A total of 42 non-calf whales and 14 calves were observed, and individual resight durations ranged from 1 to 10 d during the 10-18 d survey periods. Preliminary annual mark-recapture abundance estimates of humpback whales within the study area were obtained using photo-identification data collected during the surveys and were adjusted to account for calves. Yearly abundance estimates ranged from 34 (SE, 19; 95% CI, 12 to 92) whales in 2019 to 126 (SE, 44; 95% CI, 65 to 246) whales in 2017, with an

average of 61 (SE, 13; 95% CI, 41 to 91) whales across all years. Density estimates were calculated by year for the full study area where surveys were conducted, as well as a truncated area where most of the survey effort and all of the humpback whale sightings occurred. Yearly density estimates for the truncated survey area ranged from 0.09 to 0.33 whales/km2, and the average density estimate across years was 0.16 whales/km2. Care should be taken in the interpretation of the density estimates as they may be biased given they were derived from mark-recapture abundance estimates that are likely associated with sampling biases and that are not spatially-explicit. They cannot be used to estimate humpback whale density throughout the

Mariana Archipelago or beyond. Regardless, the study area off Saipan represents an important area for an endangered population of humpback whales that should be considered in protection and conservation efforts.

Other Citation Details:

Hill MC, Bradford AL, Oleson EM. 2020. Preliminary mark-recapture abundance estimates of humpback whales on a breeding area in the Mariana Archipelago. Pacific Islands Fisheries Science Center, PIFSC Administrative Report. H-20-07, 18 p. doi:10.25923/v3fd-yf59

DOI (Digital Object Identifier): 10.25923/v3fd-yf59

Keywords

Theme Keywords

Thesaurus Keyword
UNCONTROLLED
None abundance
None density
None humpback whales
None mark-recapture
None Megaptera novaeangliae
None photo-identification

Spatial Keywords

Thesaurus Keyword
UNCONTROLLED
None Mariana Archipelago

Physical Location

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

Document Information

Document Type: Administrative Report
Format: Acrobat Portable Document Format
Status Code: Published

Support Roles

Author

CC ID: 909387
Date Effective From: 2020
Date Effective To:
Contact (Person): Hill, Marie C
Address: 1845 Wasp Blvd.
Honolulu, HI 96818
USA
Email Address: marie.hill@noaa.gov
Phone: (808)725-5710

Co-Author

CC ID: 1171007
Date Effective From: 2020
Date Effective To:
Contact (Person): Oleson, Erin M
Address: 1845 Wasp Blvd.
Honolulu, HI 96818
USA
Email Address: erin.oleson@noaa.gov
Phone: (808)725-5712
Business Hours: 9:00 a.m. - 5:00 p.m.

Co-Author

CC ID: 909390
Date Effective From: 2020
Date Effective To:
Contact (Person): Bradford, Amanda L
Address: 1845 Wasp Blvd.
Honolulu, HI 96818
USA
Email Address: amanda.bradford@noaa.gov
Phone: (808)725-5714
Business Hours: 8:30 AM - 5:00 PM

Data Steward

CC ID: 909391
Date Effective From: 2015
Date Effective To:
Contact (Person): Hill, Marie C
Address: 1845 Wasp Blvd.
Honolulu, HI 96818
USA
Email Address: marie.hill@noaa.gov
Phone: (808)725-5710

Distributor

CC ID: 909389
Date Effective From: 2020
Date Effective To:
Contact (Organization): Pacific Islands Fisheries Science Center (PIFSC)
Address: 1845 Wasp Blvd.
Honolulu, HI 96818
USA
Email Address: pifsc.info@noaa.gov
Phone: 808-725-5360
URL: https://www.pifsc.noaa.gov
Business Hours: 8:00 a.m. - 4:30 p.m.

Metadata Contact

CC ID: 909388
Date Effective From: 2020
Date Effective To:
Contact (Person): Hill, Marie C
Address: 1845 Wasp Blvd.
Honolulu, HI 96818
USA
Email Address: marie.hill@noaa.gov
Phone: (808)725-5710

Extents

Currentness Reference: Ground Condition

Extent Group 1

Extent Group 1 / Geographic Area 1

CC ID: 909394
W° Bound: 145.5
E° Bound: 146
N° Bound: 15.5
S° Bound: 14.7
Description

Three-Islands area (Saipan, Tinian, Aguijan), CNMI.

Extent Group 1 / Time Frame 1

CC ID: 909393
Time Frame Type: Range
Start: 2015
End: 2019

Access Information

Security Class: Unclassified
Data Access Policy:

Requestor will be asked to submit a request by email to Erin Oleson {erin.oleson@noaa.gov) or Marie Hill (marie.hill@noaa.gov)

Data Access Procedure:

Requestor will be asked to submit a request by email to Erin Oleson {erin.oleson@noaa.gov) or Marie Hill (marie.hill@noaa.gov)

Data Access Constraints:

Requestor will be asked to submit a request by email to Erin Oleson {erin.oleson@noaa.gov) or Marie Hill (marie.hill@noaa.gov)

Data Use Constraints:

Requestor will be asked to submit a request by email to Erin Oleson {erin.oleson@noaa.gov) or Marie Hill (marie.hill@noaa.gov)

Metadata Access Constraints:

None

Metadata Use Constraints:

None

Distribution Information

Distribution 1

CC ID: 1171008
Start Date: 2020-06
End Date: Present
Download URL: https://repository.library.noaa.gov/view/noaa/24965
Distributor:
File Type: PDF

Catalog Details

Catalog Item ID: 59909
GUID: gov.noaa.nmfs.inport:59909
Metadata Record Created By: Marie C Hill
Metadata Record Created: 2020-06-01 21:17+0000
Metadata Record Last Modified By: SysAdmin InPortAdmin
Metadata Record Last Modified: 2022-10-20 02:17+0000
Metadata Record Published: 2022-05-06
Owner Org: PIFSC
Metadata Publication Status: Published Externally
Do Not Publish?: N
Metadata Last Review Date: 2022-05-06
Metadata Review Frequency: 1 Year
Metadata Next Review Date: 2023-05-06