gov.noaa.nmfs.inport:28202
eng
UTF8
dataset
Alaska Fisheries Science Center
7600 Sand Point Way N.E., Building 4
Seattle
WA
98115
USA
http://www.afsc.noaa.gov
WWW:LINK-1.0-http--link
Website
Website for this organization
information
0700-1700 Pacific Time
resourceProvider
Intelmann, Steve
(206) 526-4157
(206) 526-6723
7600 Sand Point Way N.E., Building 4
Seattle
WA
98115
steve.intelmann@noaa.gov
pointOfContact
2024-02-29T00:00:00
ISO 19115-2 Geographic Information - Metadata Part 2 Extensions for imagery and gridded data
ISO 19115-2:2009(E)
AFSC/RACE/GAP/McConnaughey: Trawlex Chronic Effects-1996-Other
AFSC/RACE/GAP/McConnaughey: Trawlex Chronic Effects-1996- Other
2000-01-01
publication
NOAA/NMFS/EDM
28202
https://www.fisheries.noaa.gov/inport/item/28202
WWW:LINK-1.0-http--link
Full Metadata Record
View the complete metadata record on InPort for more information about this dataset.
information
mapDigital
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. Data were merged with a 1nm grid that covered fisheries management area 512. The total number of hauls were summed for all points falling within each 1nm cell.
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.
McConnaughey, Bob
bob.mcconnaughey@noaa.gov
pointOfContact
McConnaughey, Bob
bob.mcconnaughey@noaa.gov
custodian
notPlanned
Bottom trawling
theme
DOC/NOAA/NMFS/AFSC > Alaska Fisheries Science Center, National Marine Fisheries Service, NOAA, U.S. Department of Commerce
dataCentre
Global Change Master Directory (GCMD) Data Center Keywords
2017-04-24
publication
8.5
AFSC/RACE/GAP/McConnaughey:Trawlex chronic effects-1996-Other
project
InPort
otherRestrictions
Cite As: Alaska Fisheries Science Center, [Date of Access]: AFSC/RACE/GAP/McConnaughey: Trawlex Chronic Effects-1996-Other [Data Date Range], https://www.fisheries.noaa.gov/inport/item/28202.
NOAA provides no warranty, nor accepts any liability occurring from any incomplete, incorrect, or misleading data, or from any incorrect, incomplete, or misleading use of the data. It is the responsibility of the user to determine whether or not the data is suitable for the intended purpose.
otherRestrictions
Access Constraints: None
otherRestrictions
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.
otherRestrictions
Distribution Liability: See access and use constraints information.
unclassified
NOAA Data Management Plan (DMP)
NOAA/NMFS/EDM
28202
https://www.fisheries.noaa.gov/inportserve/waf/noaa/nmfs/afsc/dmp/pdf/28202.pdf
WWW:LINK-1.0-http--link
NOAA Data Management Plan (DMP)
NOAA Data Management Plan for this record on InPort.
information
crossReference
eng; US
oceans
Microsoft Windows 7 Version 6.1 (Build 7601) Service Pack 1; Esri ArcGIS 10.3.0.4322
-163.866919
-158.670692
55.468882
59.056487
1996
1997
Effects of Chronic Bottom Trawling on the Size Structure of Soft-Bottom Benthic Invertebrates. American Fisheries Society Symposium 41:425?437, 2005
false
eng
false
bottomtrawl_alleffort_grid
2019-05-31
publication
Zip
Zip
Alaska Fisheries Science Center
(206) 526-4000
(206) 526-4004
7600 Sand Point Way N.E., Building 4
Seattle
WA
98115
afsc.webmaster@noaa.gov
https://www.fisheries.noaa.gov/about/alaska-fisheries-science-center
WWW:LINK-1.0-http--link
Alaska Fisheries Science Center Website
AKFSC Home Page
information
0700-1700 Pacific Time
distributor
https://access.afsc.noaa.gov/data-zips/32318_GAP_1996_Trawlex_chronic-effects-other.zip
WWW:LINK-1.0-http--link
https://access.afsc.noaa.gov/data-zips/32318_GAP_1996_Trawlex_chronic-effects-other.zip
Data bundled in 32318 parent project archive including:
28202-AFSC/RACE/GAP/McConnaughey: Trawlex Chronic Effects-1996-Other
28204-AFSC/RACE/GAP/McConnaughey: Trawlex Chronic Effects: Bottom Trawl Catch Effort Data from NORPAC for Years 1973-2001
28208-AFSC/RACE/GAP/McConnaughey: Trawlex Chronic Effects: Trawlex (1996) Macrofauna CPUE (count/hectare)
28210-AFSC/RACE/GAP/McConnaughey: Trawlex Chronic Effects: Trawlex (1996) Macrofauna CPUE (weight/hectare) ---
download
dataset
Historical trawl catch data were retrieved from the NORPAC database and converted to a separate point feature.
The trawl effort point file was spatially joined with the 1 nm square lattice
The number of NTOWS (see metadata for bottomtrawl_allefort_pts) were summed for each 1nm cell.
A 1 square nautical mile lattice was created
1997-01-10T00:00:00