Preliminary Mark-Recapture Abundance Estimates of Humpback Whales on a Breeding Area in the Mariana Archipelago
Pacific Islands Fisheries Science Center
Document
(DOC)
| ID: 59909
| Published / External
Created: 2020-06-01
|
Last Modified: 2023-10-17
Project (PRJ) | ID: 30990
ID: 59909
Document (DOC)
* Discovery• First Pass
» Metadata Rubric
Item Identification
* » Title | Preliminary Mark-Recapture Abundance Estimates of Humpback Whales on a Breeding Area in the Mariana Archipelago |
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Short Name | |
* Status | Completed |
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• 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. |
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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 |
• Supplemental Information | |
DOI (Digital Object Identifier) | 10.25923/v3fd-yf59 |
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DOI Issue Date |
Keywords
Theme Keywords
Thesaurus | Keyword |
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None | abundance |
None | density |
None | humpback whales |
None | mark-recapture |
None | Megaptera novaeangliae |
None | photo-identification |
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* Spatial Keywords
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None | Mariana Archipelago |
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Physical Location
• » Organization | Pacific Islands Fisheries Science Center |
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• » City | Honolulu |
• » State/Province | HI |
• Country | USA |
• » Location Description |
Document Information
Document Type | Administrative Report |
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Format | Acrobat Portable Document Format |
Format Version | |
Status Code | Published |
Support Roles
* » Support Role | Author |
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* » Date Effective From | 2020 |
Date Effective To | |
Person | Hill, Marie C |
Address |
1845 Wasp Blvd. Honolulu, HI 96818 USA |
Email Address | marie.hill@noaa.gov |
Phone | (808)725-5710 |
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Contact Instructions |
* » Support Role | Co-Author |
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* » Date Effective From | 2020 |
Date Effective To | |
Person | Bradford, Amanda L |
Address |
1845 Wasp Blvd. Honolulu, HI 96818 USA |
Email Address | amanda.bradford@noaa.gov |
Phone | (808)725-5714 |
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URL | |
Business Hours | 8:30 AM - 5:00 PM |
Contact Instructions |
* » Support Role | Co-Author |
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* » Date Effective From | 2020 |
Date Effective To | |
Person | Oleson, Erin M |
Address |
1845 Wasp Blvd. Honolulu, HI 96818 USA |
Email Address | erin.oleson@noaa.gov |
Phone | (808)725-5712 |
Fax | |
Mobile | |
URL | |
Business Hours | 9:00 a.m. - 5:00 p.m. |
Contact Instructions |
* » Support Role | Data Steward |
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* » Date Effective From | 2015 |
Date Effective To | |
Person | Hill, Marie C |
Address |
1845 Wasp Blvd. Honolulu, HI 96818 USA |
Email Address | marie.hill@noaa.gov |
Phone | (808)725-5710 |
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* » Support Role | Distributor |
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* » Date Effective From | 2020 |
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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 |
Fax | |
Mobile | |
URL | https://www.pifsc.noaa.gov |
Business Hours | 8:00 a.m. - 4:30 p.m. |
Contact Instructions |
* » Support Role | Metadata Contact |
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* » Date Effective From | 2020 |
Date Effective To | |
Person | Hill, Marie C |
Address |
1845 Wasp Blvd. Honolulu, HI 96818 USA |
Email Address | marie.hill@noaa.gov |
Phone | (808)725-5710 |
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Extents
Currentness Reference | Ground Condition |
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Extent Group 1
Extent Description |
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Extent Group 1 / Geographic Area 1
* » W° Bound | 145.5 |
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* » E° Bound | 146 |
* » N° Bound | 15.5 |
* » S° Bound | 14.7 |
* » Description |
Three-Islands area (Saipan, Tinian, Aguijan), CNMI. |
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Extent Group 1 / Time Frame 1
* » Time Frame Type | Range |
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* » Start | 2015 |
End | 2019 |
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Description |
Access Information
* » Security Class | Unclassified |
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* Security Classification System | |
Security Handling Description | |
• 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 |
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None |
Distribution Information
Start Date | 2020-06 |
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End Date | Present |
» Download URL | https://repository.library.noaa.gov/view/noaa/24965 |
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Catalog Details
Catalog Item ID | 59909 |
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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 | 2023-10-17 16:12+0000 |
Metadata Record Published | 2022-05-06 |
Owner Org | PIFSC |
Metadata Publication Status | Published Externally |
Do Not Publish? | N |
Metadata Workflow State | Published / External |
Metadata Last Review Date | 2022-05-06 |
Metadata Review Frequency | 1 Year |
Metadata Next Review Date | 2023-05-06 |
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