AFSC/MML: Distribution and abundance of Southeast Alaska harbor porpoise, 2019

Alaska Fisheries Science Center
Data Set (DS) | ID: 69383 | Published / External
Created: 2023-03-01   |   Last Modified: 2024-10-03

Parent: Cetacean Assessment and Ecology Program
Project (PRJ) | ID: 23107

ID: 69383
Data Set (DS)

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Item Identification

* » Title AFSC/MML: Distribution and abundance of Southeast Alaska harbor porpoise, 2019
Short Name  
* Status Completed
Creation Date 2019
Revision Date  
• Publication Date 2023
* » Abstract

As currently defined, the Southeast Alaska (SEAK) harbor porpoise (Phocoena phocoena) stock ranges from Dixon entrance to Cape Suckling, including inland waterways. Since the early 1990s, the Marine Mammal Laboratory (MML) has conducted ship and aerial surveys to assess abundance and status of harbor porpoise in this region (Dahlheim et al., 2009; Hobbs and Waite, 2010). In recent years, analysis of ship survey sighting data from inland waters has indicated the potential for substructure within this stock. Trends in abundance between 1991 and 2012 suggested that numbers of harbor porpoise in the northern portion of the study area (Glacier Bay/Icy Strait) were stable. However, in the southern portion of the range (Wrangell and Zarembo), numbers declined significantly in the mid-2000s and subsequently increased again in early 2010 (Dahlheim et al., 2015). The decline was observed only in a region where gillnet fisheries operate. Such contrasting trends in abundance between the northern and southern portions of the range suggest the possible existence of multiple populations within the currently recognized SEAK stock.

There is evidence that incidental mortality of harbor porpoise in the salmon driftnet fishery in SEAK may exceed the maximum allowable level under the Marine Mammal Protection Act (MMPA) (Muto et al., 2018). The most recent estimate of abundance for the whole stock is more than 8 years old and cannot be used to estimate PBR. In addition, estimates of abundance from inland waters from 2011 are now outdated and are no longer applicable for management. Therefore, a new estimate was needed to update estimates of the maximum allowable bycatch levels.
* Purpose

The purpose of this ship survey was to assess distribution of harbor porpoise in inland waters of SEAK, including areas never previously surveyed by the MML cruises, and to collect visual line transect survey data to compute a new estimate of abundance.
Notes
Other Citation Details
• Supplemental Information
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Keywords

Theme Keywords

Thesaurus Keyword
ISO 19115 Topic Category biota
ISO 19115 Topic Category oceans
World Register of Marine Species (WoRMS) Phocoena phocoena
None Abundance estimate
None Distance sampling
None Line transect
   
   
   

Temporal Keywords

Thesaurus Keyword
None Summer
   
   
   

* Spatial Keywords

Thesaurus Keyword
Global Change Master Directory (GCMD) Location Keywords CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > ALASKA
   
   
   

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Physical Location

• » Organization National Marine Mammal Laboratory
• » City Seattle
• » State/Province WA
• Country  
• » Location Description

Data Set Information

* Data Set Scope Code Data Set
• Data Set Type Spreadsheet
• Maintenance Frequency None Planned
Maintenance Note
» Data Presentation Form Table (digital)
• Entity Attribute Overview
Entity Attribute Detail Citation
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» At least one Distributor Org, one Metadata Contact, one Point of Contact, and one Data Steward should be listed.
* » Support Role Data Steward
* » Date Effective From 2019
Date Effective To
Person Zerbini, Alexandre
Email Address alex.zerbini@noaa.gov
Phone  
Fax  
Mobile  
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Contact Instructions
* » Support Role Distributor
* » Date Effective From 2016-03-23
Date Effective To
Organization NOAA National Centers for Environmental Information (NCEI)
Email Address ncei.info@noaa.gov
Phone  
Fax  
Mobile  
URL https://www.ncei.noaa.gov/contact
Business Hours  
Contact Instructions
* » Support Role Metadata Contact
* » Date Effective From 2016-03-23
Date Effective To
Person MC, Metadata Coordinators
Email Address AFSC.metadata@noaa.gov
Phone  
Fax  
Mobile  
URL  
Business Hours  
Contact Instructions
* » Support Role Originator
* » Date Effective From 2016-03-23
Date Effective To
Organization Alaska Fisheries Science Center (AFSC)
Address 7600 Sand Point Way N.E., Building 4
Seattle, WA 98115
USA
Email Address afsc.webmaster@noaa.gov
Phone (206) 526-4000
Fax (206) 526-4004
Mobile  
URL https://www.fisheries.noaa.gov/about/alaska-fisheries-science-center
Business Hours 0700-1700 Pacific Time
Contact Instructions
* » Support Role Point of Contact
* » Date Effective From 2016-03-23
Date Effective To
Person Angliss, Robyn
Address 7600 Sand Point Way, NE
Seattle, WA 98115-6349
Email Address robyn.angliss@noaa.gov
Phone 206-526-4032
Fax 206-526-6615
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* » Date Effective From
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* Contact Instructions
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* » Date Effective From
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* » Date Effective From
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* Contact Instructions

Extents

Currentness Reference Ground Condition

Extent Group 1

Extent Description

Extent Group 1 / Geographic Area 1

* » W° Bound -137.16666666667
* » E° Bound -131
* » N° Bound 59.5
* » S° Bound 54.5
* » Description

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* » W° Bound
* » E° Bound
* » N° Bound
* » S° Bound
* » Description

Southeast Alaska

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Vertical Maximum

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* » Time Frame Type Range
* » Start 2019-07-19
End 2019-08-12
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Description

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* » Security Class Unclassified
* Security Classification System
Security Handling Description
• Data Access Policy
» Data Access Procedure
• » Data Access Constraints

There are no legal restrictions on access to the data. They reside in public domain and can be freely distributed.
• Data Use Constraints

User must read and fully comprehend the metadata prior to use. Applications or inferences derived from the data should be carefully considered for accuracy. Acknowledgement of NOAA/NMFS/AFSC, as the source from which these data were obtained in any publications and/or other representations of these, data is suggested.
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Distribution Information

Start Date  
» Download URL https://www.ncei.noaa.gov/access/metadata/landing-page/bin/iso?id=gov.noaa.nodc:0277244
Distributor NOAA National Centers for Environmental Information (NCEI) (2016-03-23 - Present)
File Name HP_SEAK_2019 dataset.csv
Description

csv files with effort and sighting data.
File Date/Time  
File Type (Deprecated) .csv
Distribution Format CSV - Comma Separated Values (Text)
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» Download URL
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URLs

URL https://www.frontiersin.org/articles/10.3389/fmars.2022.966489/full
Name Estimating abundance of an elusive cetacean in a complex environment: Harbor porpoises (Phocoena phocoena) in inland waters of Southeast Alaska
URL Type Online Resource
File Resource Format  
Description

Publication of abundance estimate from the 2019 harbor porpoise survey
URL https://repository.library.noaa.gov/view/noaa/46442
Name Identification of demographically independent populations within the currently designated Southeast Alaska harbor porpoise stock.
URL Type Online Resource
File Resource Format  
Description

Publication on Southeast Alaska harbor porpoise demographically

independent populations.
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Survey data was collected with Wincruz (Windows Real Time Sighting-Effort Event Logger developed by Robert Holland at Southwest Fisheries Science Center).

Conceptual Consistency
» Quality Control Procedures Employed

Accuracy was ensured by reviewing and editing the data in the field on a daily basis. Post cruise processing included data extraction and error checking using customized software (written by Paul Wade, Marine Mammal Laboratory). Tracklines and sightings were plotted in ArcMap to check for accuracy.

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» If World Data Center or Other, Specify  
» If To Be Determined, Unable to Archive, or No Archiving Intended, Explain  
 
» Approximate Delay Between Data Collection and Archiving  
» How Will the Data Be Protected from Accidental or Malicious Modification or Deletion Prior to Receipt by the Archive?  
 

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» Lineage Statement

Methods are described in publication: https://www.frontiersin.org/articles/10.3389/fmars.2022.966489/full

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  Entity (ENT) HP_SEAK_2019 dataset.csv
     
     
     

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Catalog Details

Catalog Item ID 69383
Metadata Record Created By Janice Waite
Metadata Record Created 2023-03-01 18:46+0000
Metadata Record Last Modified By SysAdmin InPortAdmin
» Metadata Record Last Modified 2024-10-03 18:16+0000
Metadata Record Published 2023-03-08
Owner Org AFSC
Metadata Publication Status Published Externally
Do Not Publish? N
Metadata Workflow State Published / External
Metadata Last Review Date 2023-03-08
Metadata Review Frequency 1 Year
Metadata Next Review Date 2024-03-08
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