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Physical Location
Data Set Info
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Catalog Details

Summary

Short Citation
Alaska Fisheries Science Center, 2024: AFSC/RACE/GAP/McConnaughey:Trawlex chronic effects-1996-Mbt & Scanmar, https://www.fisheries.noaa.gov/inport/item/32320.
Full Citation Examples

Abstract

The eastern Bering Sea has experienced rapid and intensive development of commercial trawl fisheries. Because of good record keeping and the relatively brief history of fishing it is possible to reconstruct the spatial and temporal patterns of exploitation. Previously unfished (UF) areas can be identified and directly compared with heavily fished (HF) areas to investigate long-term consequences for the benthos. Using this approach, macrofauna populations in a shallow (48 m average) soft-bottom area were studied during 1996. Catch data were extracted from the AFSC NORPAC database for years 1973-2001 to provide a summary of trawl catch effort, specific focus was placed on the area within Fisheries Management Area 512. The total number of hauls and tonnage for each data point are provided. Foreign, domestic, and Joint Venture fishing vessels are also described.

Distribution Information

Access Constraints:

None

Use Constraints:

The United States Government shall not be held liable for improper or incorrect use of data described and/or contained herein. These data and related graphics are not legal documents and are not intended to be used as such. The Alaska Fisheries Science Center gives no warranty, expressed or implied, as to the accuracy, reliability, or completeness of these data. Spatial information may not meet National Map Accuracy Standards. The information contained in these data is dynamic and may change over time. Original data were compiled from various sources. The data are not better than the original sources from which they were derived. It is the responsibility of the data user to use the data appropriately and consistent within the limitations of geospatial data in general and these data in particular. It is strongly recommended that these data are directly acquired from an Alaska Fisheries Science Center server and not indirectly through other sources which may have changed the data in some way. Although these data have been used (processed) successfully on a computer system at the Alaska Fisheries Science Center, no warranty expressed or implied is made regarding the utility of the data on another system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. This disclaimer applies both to individual use of the data and aggregate use with other data.

Child Items

No Child Items for this record.

Contact Information

Point of Contact
Bob McConnaughey
bob.mcconnaughey@noaa.gov

Metadata Contact
Steve Intelmann
steve.intelmann@noaa.gov
(206) 526-4157

Extents

Geographic Area 1

-180° W, 180° E, 64.415838° N, 50.498977° S

Time Frame 1
1996 - 1997

Item Identification

Title: AFSC/RACE/GAP/McConnaughey:Trawlex chronic effects-1996-Mbt & Scanmar
Short Name: AFSC/RACE/GAP/McConnaughey:Trawlex chronic effects-1996-Mbt & Scanmar
Status: Completed
Abstract:

The eastern Bering Sea has experienced rapid and intensive development of commercial trawl fisheries. Because of good record keeping and the relatively brief history of fishing it is possible to reconstruct the spatial and temporal patterns of exploitation. Previously unfished (UF) areas can be identified and directly compared with heavily fished (HF) areas to investigate long-term consequences for the benthos. Using this approach, macrofauna populations in a shallow (48 m average) soft-bottom area were studied during 1996. Catch data were extracted from the AFSC NORPAC database for years 1973-2001 to provide a summary of trawl catch effort, specific focus was placed on the area within Fisheries Management Area 512. The total number of hauls and tonnage for each data point are provided. Foreign, domestic, and Joint Venture fishing vessels are also described.

Purpose:

Benthic communities are structured by dynamically interacting factors that determine habitat quality. Since benthic macrofauna demonstrate strong and often narrowly defined affinities, forces altering (or disturbing) the environment will be of considerable importance to their distribution and abundance. Commercial fishing with mobile gear, such as bottom trawls and dredges, and the physical disturbance that results, is widespread in continental shelf areas. Because of its prevalence and the potential for adverse effects, there have been numerous attempts to quantify sea-floor exposure at various spatial scales. The well documented development of commerical fisheries in the eastern Bering Sea (EBS) since 1954 presents a unique opportunity for studying trawling impacts. The Crab and Halibut Protection Zone 1 (CHPZ1; also known as management area 512), located north of the Alaska Peninsula in Bristol Bay, has a long and complex history of trawl prohibitions that extend from 1959 to the present. Using detailed accounts of closures and fishing activity, it is possible to reconstruct historical effort and identify essentially pristine areas immediately adjacent to areas that have been heavily fished with bottom trawls. This physical arrangement permits an examination of chronic disturbance by bottom trawls, without confounding environmental effects that result from geographic separation. Sampling locations were preselected on the basis of historical fish effort. Starting positions for commercial bottom trawls (n=392 743 through July 1996) were spatially joined with a 1 nm2 grid to calculate total number of trawls per nm2, and thus identify heavily fished (HF) and unfished (UF) areas along the boundary of the CHPZ1 (NORPAC fishery observer database maintained at the NMFS Alaska Fisheries ScienceCenter, Seattle, Washington). HF and UF cells on opposite sides of the boundary line were paired a priori on the basis of spatial proximity and were generally separated by 1 nm to allow for prior navigational discrepancies. A total of 42 pairs was identified at the northeastern corner of the CHPZ1. Catch data were extracted from the AFSC NORPAC database for years 1973-2001 to provide a summary of trawl catch effort. The points in this feature dataset represent the initial trawl set point for a given haul.

Supplemental Information:

Effects of Chronic Bottom Trawling on the Size Structure of Soft-Bottom Benthic Invertebrates. American Fisheries Society Symposium 41:425?437, 2005

Keywords Edit

Physical Location

Organization: Alaska Fisheries Science Center
City: Seattle
State/Province: WA
Country: USA

Data Set Information

Data Set Scope Code: Data Set
Maintenance Frequency: None Planned
Data Presentation Form: unknown

Support Roles

Data Steward

CC ID: 322561
Date Effective From: 2015
Date Effective To:
Contact (Person): McConnaughey, Bob
Email Address: bob.mcconnaughey@noaa.gov

Distributor

CC ID: 322562
Date Effective From: 2015
Date Effective To:
Contact (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
URL: https://www.fisheries.noaa.gov/about/alaska-fisheries-science-center
Business Hours: 0700-1700 Pacific Time

Metadata Contact

CC ID: 322559
Date Effective From: 2015-10-27
Date Effective To:
Contact (Person): Intelmann, Steve
Address: 7600 Sand Point Way N.E., Building 4
Seattle, WA 98115
USA
Email Address: steve.intelmann@noaa.gov
Phone: (206) 526-4157
Fax: (206) 526-6723

Point of Contact

CC ID: 322560
Date Effective From: 2015-10-27
Date Effective To:
Contact (Person): McConnaughey, Bob
Email Address: bob.mcconnaughey@noaa.gov

Extents

Extent Group 1

Extent Group 1 / Geographic Area 1

CC ID: 322565
W° Bound: -180
E° Bound: 180
N° Bound: 64.415838
S° Bound: 50.498977

Extent Group 1 / Time Frame 1

CC ID: 322566
Time Frame Type: Range
Start: 1996
End: 1997

Access Information

Security Class: Unclassified
Data Access Procedure:

unknown

Data Access Constraints:

None

Data Use Constraints:

The United States Government shall not be held liable for improper or incorrect use of data described and/or contained herein. These data and related graphics are not legal documents and are not intended to be used as such. The Alaska Fisheries Science Center gives no warranty, expressed or implied, as to the accuracy, reliability, or completeness of these data. Spatial information may not meet National Map Accuracy Standards. The information contained in these data is dynamic and may change over time. Original data were compiled from various sources. The data are not better than the original sources from which they were derived. It is the responsibility of the data user to use the data appropriately and consistent within the limitations of geospatial data in general and these data in particular. It is strongly recommended that these data are directly acquired from an Alaska Fisheries Science Center server and not indirectly through other sources which may have changed the data in some way. Although these data have been used (processed) successfully on a computer system at the Alaska Fisheries Science Center, no warranty expressed or implied is made regarding the utility of the data on another system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. This disclaimer applies both to individual use of the data and aggregate use with other data.

Distribution Information

Distribution 1

CC ID: 322563
Download URL: https://access.afsc.noaa.gov/data-zips/32320_GAP_1996_Trawlex_chronic-effects-Mbt_and_Scanmar.zip
Distributor:
File Type (Deprecated): Zip
Compression: Zip

Data Quality

Quality Control Procedures Employed:

unknown

Data Management

Have Resources for Management of these Data Been Identified?: No
Approximate Percentage of Budget for these Data Devoted to Data Management: Unknown
Do these Data Comply with the Data Access Directive?: No
Is Access to the Data Limited Based on an Approved Waiver?: No
If Distributor (Data Hosting Service) is Needed, Please Indicate: Yes
Approximate Delay Between Data Collection and Dissemination: unknown
Actual or Planned Long-Term Data Archive Location: NCEI-MD
Approximate Delay Between Data Collection and Archiving: unknown
How Will the Data Be Protected from Accidental or Malicious Modification or Deletion Prior to Receipt by the Archive?:

IT Security and Contingency Plan for the system establishes procedures and applies to the functions, operations, and resources necessary to recover and restore data as hosted in the Western Regional Support Center in Seattle, Washington, following a disruption.

Lineage

Lineage Statement:

unknown

Catalog Details

Catalog Item ID: 32320
GUID: gov.noaa.nmfs.inport:32320
Metadata Record Created By: Theresa A Smith
Metadata Record Created: 2016-04-15 14:49+0000
Metadata Record Last Modified By: SysAdmin InPortAdmin
Metadata Record Last Modified: 2024-01-15 12:08+0000
Metadata Record Published: 2019-05-31
Owner Org: AFSC
Metadata Publication Status: Published Externally
Do Not Publish?: N
Metadata Last Review Date: 2019-05-31
Metadata Review Frequency: 1 Year
Metadata Next Review Date: 2020-05-31