Compiled annual statewide Alaskan salmon escapement counts, 1921-2017
The number of mature salmon migrating from the marine environment to freshwater streams is defined as escapement. Escapement data are the enumeration of these migrating fish as they pass upstream, and are a widely used index of spawning salmon abundance. These data are important for fisheries manage...
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Knowledge Network for Biocomplexity
2018
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dataone:doi:10.5063/F1CV4FXG 2024-06-03T18:47:06+00:00 Compiled annual statewide Alaskan salmon escapement counts, 1921-2017 Jeanette Clark Rich Brenner Stephanie Freund Alaska, USA ENVELOPE(-176.0,-131.0,78.0,47.0) BEGINDATE: 1921-01-01T00:00:00Z ENDDATE: 2017-01-01T00:00:00Z 2018-02-12T00:00:00Z https://doi.org/10.5063/F1CV4FXG unknown Knowledge Network for Biocomplexity Oncorhynchus Oncorhynchus tshawytscha Oncorhynchus Oncorhynchus keta Oncorhynchus Oncorhynchus kisutch Oncorhynchus Oncorhynchus gorbuscha Oncorhynchus Oncorhynchus nerka Oncorhynchus tshawytscha Oncorhynchus keta Oncorhynchus kisutch Oncorhynchus gorbuscha Oncorhynchus nerka Dataset 2018 dataone:urn:node:KNB https://doi.org/10.5063/F1CV4FXG 2024-06-03T18:11:22Z The number of mature salmon migrating from the marine environment to freshwater streams is defined as escapement. Escapement data are the enumeration of these migrating fish as they pass upstream, and are a widely used index of spawning salmon abundance. These data are important for fisheries management, since most salmon harvest occurs near the mouths of rivers where salmon spawn during this migration. Escapement data are collected in a variety of ways. Stationary projects utilize observers stationed along freshwater corridors who count salmon as they pass upriver through weirs or past elevated towers. Sonar equipment placed in the river can also give a stationary escapement count. These counts usually represent a sample, and are expanded to represent a 24h period. Escapement data can also be collected using aerial surveys, where observers in an aircraft provide an index to estimate escapement. In general, escapement counts do not represent total abundance, but instead an index of abundance. Surveys are usually timed to coincide with peak spawning activity, generally in the summer, but in the case of Coho salmon in the fall as well. Some data about non-salmon species are also included. This dataset contains compiled annual data from multiple sources. The .Rmd merges all datasets, attaches location information from the escapement_locations.csv file, identifies and flags duplicate records, and performs quality assurance checks by filtering and graphing results. Dataset Oncorhynchus gorbuscha Alaska Knowledge Network for Biocomplexity (via DataONE) Keta ENVELOPE(-19.455,-19.455,65.656,65.656) ENVELOPE(-176.0,-131.0,78.0,47.0) |
institution |
Open Polar |
collection |
Knowledge Network for Biocomplexity (via DataONE) |
op_collection_id |
dataone:urn:node:KNB |
language |
unknown |
topic |
Oncorhynchus Oncorhynchus tshawytscha Oncorhynchus Oncorhynchus keta Oncorhynchus Oncorhynchus kisutch Oncorhynchus Oncorhynchus gorbuscha Oncorhynchus Oncorhynchus nerka Oncorhynchus tshawytscha Oncorhynchus keta Oncorhynchus kisutch Oncorhynchus gorbuscha Oncorhynchus nerka |
spellingShingle |
Oncorhynchus Oncorhynchus tshawytscha Oncorhynchus Oncorhynchus keta Oncorhynchus Oncorhynchus kisutch Oncorhynchus Oncorhynchus gorbuscha Oncorhynchus Oncorhynchus nerka Oncorhynchus tshawytscha Oncorhynchus keta Oncorhynchus kisutch Oncorhynchus gorbuscha Oncorhynchus nerka Jeanette Clark Rich Brenner Stephanie Freund Compiled annual statewide Alaskan salmon escapement counts, 1921-2017 |
topic_facet |
Oncorhynchus Oncorhynchus tshawytscha Oncorhynchus Oncorhynchus keta Oncorhynchus Oncorhynchus kisutch Oncorhynchus Oncorhynchus gorbuscha Oncorhynchus Oncorhynchus nerka Oncorhynchus tshawytscha Oncorhynchus keta Oncorhynchus kisutch Oncorhynchus gorbuscha Oncorhynchus nerka |
description |
The number of mature salmon migrating from the marine environment to freshwater streams is defined as escapement. Escapement data are the enumeration of these migrating fish as they pass upstream, and are a widely used index of spawning salmon abundance. These data are important for fisheries management, since most salmon harvest occurs near the mouths of rivers where salmon spawn during this migration. Escapement data are collected in a variety of ways. Stationary projects utilize observers stationed along freshwater corridors who count salmon as they pass upriver through weirs or past elevated towers. Sonar equipment placed in the river can also give a stationary escapement count. These counts usually represent a sample, and are expanded to represent a 24h period. Escapement data can also be collected using aerial surveys, where observers in an aircraft provide an index to estimate escapement. In general, escapement counts do not represent total abundance, but instead an index of abundance. Surveys are usually timed to coincide with peak spawning activity, generally in the summer, but in the case of Coho salmon in the fall as well. Some data about non-salmon species are also included. This dataset contains compiled annual data from multiple sources. The .Rmd merges all datasets, attaches location information from the escapement_locations.csv file, identifies and flags duplicate records, and performs quality assurance checks by filtering and graphing results. |
format |
Dataset |
author |
Jeanette Clark Rich Brenner Stephanie Freund |
author_facet |
Jeanette Clark Rich Brenner Stephanie Freund |
author_sort |
Jeanette Clark |
title |
Compiled annual statewide Alaskan salmon escapement counts, 1921-2017 |
title_short |
Compiled annual statewide Alaskan salmon escapement counts, 1921-2017 |
title_full |
Compiled annual statewide Alaskan salmon escapement counts, 1921-2017 |
title_fullStr |
Compiled annual statewide Alaskan salmon escapement counts, 1921-2017 |
title_full_unstemmed |
Compiled annual statewide Alaskan salmon escapement counts, 1921-2017 |
title_sort |
compiled annual statewide alaskan salmon escapement counts, 1921-2017 |
publisher |
Knowledge Network for Biocomplexity |
publishDate |
2018 |
url |
https://doi.org/10.5063/F1CV4FXG |
op_coverage |
Alaska, USA ENVELOPE(-176.0,-131.0,78.0,47.0) BEGINDATE: 1921-01-01T00:00:00Z ENDDATE: 2017-01-01T00:00:00Z |
long_lat |
ENVELOPE(-19.455,-19.455,65.656,65.656) ENVELOPE(-176.0,-131.0,78.0,47.0) |
geographic |
Keta |
geographic_facet |
Keta |
genre |
Oncorhynchus gorbuscha Alaska |
genre_facet |
Oncorhynchus gorbuscha Alaska |
op_doi |
https://doi.org/10.5063/F1CV4FXG |
_version_ |
1800876064007782400 |