Evaluation of Hypotheses for Describing Temporal Trends in Atlantic Salmon Parr Densities in Northeast U.S. Rivers
Abstract Atlantic salmon Salmo salar in the USA have declined dramatically and their persistence is heavily dependent on stocking juvenile fish, predominantly fry. The success of stocking hatchery fry is evaluated annually throughout New England by electrofishing surveys targeting age‐1 parr. The ob...
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Online Access: | http://dx.doi.org/10.1080/02755947.2011.574081 https://afspubs.onlinelibrary.wiley.com/doi/pdf/10.1080/02755947.2011.574081 |
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crwiley:10.1080/02755947.2011.574081 2024-06-02T08:03:26+00:00 Evaluation of Hypotheses for Describing Temporal Trends in Atlantic Salmon Parr Densities in Northeast U.S. Rivers Wagner, Tyler Sweka, John A. 2011 http://dx.doi.org/10.1080/02755947.2011.574081 https://afspubs.onlinelibrary.wiley.com/doi/pdf/10.1080/02755947.2011.574081 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor North American Journal of Fisheries Management volume 31, issue 2, page 340-351 ISSN 0275-5947 1548-8675 journal-article 2011 crwiley https://doi.org/10.1080/02755947.2011.574081 2024-05-03T11:40:10Z Abstract Atlantic salmon Salmo salar in the USA have declined dramatically and their persistence is heavily dependent on stocking juvenile fish, predominantly fry. The success of stocking hatchery fry is evaluated annually throughout New England by electrofishing surveys targeting age‐1 parr. The objective of this study was to examine temporal trends in Atlantic salmon parr densities throughout New England and determine how trends vary among river basins. We fit generalized additive mixed models to investigate potential linear and nonlinear temporal trends in parr density. Akaike's information criterion was used to evaluate competing hypotheses about how temporal trends vary regionally. The top‐ranked model suggested two types of trends. The first type (the Penobscot River) showed a nonlinear trend in which parr densities increased until the 1990s and then rapidly decreased through 2008. The second type (all other rivers) showed a linear decrease throughout the time series. Parr density trends reflected trends in spawning escapement for each river group. We conclude that fry stocking has not been able to overcome the decrease in spawning escapement in altered stream ecosystems in New England and that additional management strategies should be considered. Received July 2, 2010; accepted January 9, 2011 Article in Journal/Newspaper Atlantic salmon Salmo salar Wiley Online Library North American Journal of Fisheries Management 31 2 340 351 |
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Open Polar |
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Wiley Online Library |
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crwiley |
language |
English |
description |
Abstract Atlantic salmon Salmo salar in the USA have declined dramatically and their persistence is heavily dependent on stocking juvenile fish, predominantly fry. The success of stocking hatchery fry is evaluated annually throughout New England by electrofishing surveys targeting age‐1 parr. The objective of this study was to examine temporal trends in Atlantic salmon parr densities throughout New England and determine how trends vary among river basins. We fit generalized additive mixed models to investigate potential linear and nonlinear temporal trends in parr density. Akaike's information criterion was used to evaluate competing hypotheses about how temporal trends vary regionally. The top‐ranked model suggested two types of trends. The first type (the Penobscot River) showed a nonlinear trend in which parr densities increased until the 1990s and then rapidly decreased through 2008. The second type (all other rivers) showed a linear decrease throughout the time series. Parr density trends reflected trends in spawning escapement for each river group. We conclude that fry stocking has not been able to overcome the decrease in spawning escapement in altered stream ecosystems in New England and that additional management strategies should be considered. Received July 2, 2010; accepted January 9, 2011 |
format |
Article in Journal/Newspaper |
author |
Wagner, Tyler Sweka, John A. |
spellingShingle |
Wagner, Tyler Sweka, John A. Evaluation of Hypotheses for Describing Temporal Trends in Atlantic Salmon Parr Densities in Northeast U.S. Rivers |
author_facet |
Wagner, Tyler Sweka, John A. |
author_sort |
Wagner, Tyler |
title |
Evaluation of Hypotheses for Describing Temporal Trends in Atlantic Salmon Parr Densities in Northeast U.S. Rivers |
title_short |
Evaluation of Hypotheses for Describing Temporal Trends in Atlantic Salmon Parr Densities in Northeast U.S. Rivers |
title_full |
Evaluation of Hypotheses for Describing Temporal Trends in Atlantic Salmon Parr Densities in Northeast U.S. Rivers |
title_fullStr |
Evaluation of Hypotheses for Describing Temporal Trends in Atlantic Salmon Parr Densities in Northeast U.S. Rivers |
title_full_unstemmed |
Evaluation of Hypotheses for Describing Temporal Trends in Atlantic Salmon Parr Densities in Northeast U.S. Rivers |
title_sort |
evaluation of hypotheses for describing temporal trends in atlantic salmon parr densities in northeast u.s. rivers |
publisher |
Wiley |
publishDate |
2011 |
url |
http://dx.doi.org/10.1080/02755947.2011.574081 https://afspubs.onlinelibrary.wiley.com/doi/pdf/10.1080/02755947.2011.574081 |
genre |
Atlantic salmon Salmo salar |
genre_facet |
Atlantic salmon Salmo salar |
op_source |
North American Journal of Fisheries Management volume 31, issue 2, page 340-351 ISSN 0275-5947 1548-8675 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1080/02755947.2011.574081 |
container_title |
North American Journal of Fisheries Management |
container_volume |
31 |
container_issue |
2 |
container_start_page |
340 |
op_container_end_page |
351 |
_version_ |
1800747958140928000 |