東華大學圖書館 |

語系: 繁體中文

說明(常見問題)

回圖書館首頁

手機版館藏查詢

登入

回首頁

切換: 標籤 | MARC模式 | ISBD

Influence of Freshwater Processes on...

Edwards, Olivia N.

FindBook

Google Book

Amazon

博客來

Influence of Freshwater Processes on Juvenile Chinook Salmon Size, Movement, and Outmigration Timing in the Chena River, Alaska.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Influence of Freshwater Processes on Juvenile Chinook Salmon Size, Movement, and Outmigration Timing in the Chena River, Alaska./
作者:	Edwards, Olivia N.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2023,
面頁冊數:	107 p.
附註:	Source: Masters Abstracts International, Volume: 85-01.
Contained By:	Masters Abstracts International85-01.
標題:	Aquatic sciences. -
電子資源:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=30569229
ISBN:	9798379951962

Influence of Freshwater Processes on Juvenile Chinook Salmon Size, Movement, and Outmigration Timing in the Chena River, Alaska.
Edwards, Olivia N.

Influence of Freshwater Processes on Juvenile Chinook Salmon Size, Movement, and Outmigration Timing in the Chena River, Alaska. - Ann Arbor : ProQuest Dissertations & Theses, 2023 - 107 p.

Source: Masters Abstracts International, Volume: 85-01.

Thesis (M.S.)--University of Alaska Fairbanks, 2023.

This item must not be sold to any third party vendors.

Chinook Salmon Oncorhynchus tshawytscha have experienced population declines across their range in recent decades, including Alaska where they are a critical subsistence, commercial, and sport fish species. The Alaska Board of Fisheries has listed Yukon River Chinook salmon as a "stock of yield concern" since 2000 prompting the implementation of escapement goals for key spawning tributaries in 2001. Additionally, research efforts across the basin have increased to better understand potential mechanisms behind these declines and provide information to facilitate management decisions. To help fill a critical data gap in the overall understanding of the fishery, this research investigated various freshwater juvenile life history factors including patterns in post-emergence summer body size, movement, and fish size during spring outmigration in the Chena River, Alaska. This research also identified links between these biological factors and freshwater processes that are affected by climate change, including stream temperature and discharge, with the intention of documenting benchmark information as conditions continue to change. Juvenile Chinook Salmon movement among four key rearing areas was observed during summer and fall 2019 and early spring 2020. Despite differences in early summer size patterns, by the end of September mean fork lengths were not statistically different among all rearing areas (ANOVA; all P > 0.05). Additionally, mean September weight varied among six years of empirical data and ranged from 3.19 g in 2018 (0.03 SE) to a maximum of 5.10 g in 2009 (0.05 SE). September weight was simulated across years with variable stream temperatures and discharge (2003 to 2020) using a bioenergetics model, and compared to observed data. Weight simulations were within <0.40 g of observed mean end of summer weight for all years except in 2019 when the predicted weight was 1.38 g greater than the observed mean September weight. Generally, both observed and simulated weights were lower in years with higher flows. Peak spring outmigration dates ranged from 13 to 29 May (mean = May 18 ± 2.6 d; 95% CI). Fish length, weight, and body condition during outmigration varied among years; fish were smallest in 2019 and largest in 2014. Catch per unit effort also varied with discharge and among years; typically, fewer fish were caught on days with higher discharge. In Spring 2020, catches were compared between minnow traps fished in close proximity to a continuously operating screw trap and found that the screw trap caught more and larger fish than minnow traps and was able to operate during periods of high discharge, while minnow traps had to be pulled. Climate change will continue to affect Chinook Salmon in the northern extent of their range via increasing variability in flow regimes and increasing water temperatures. Understanding how these changes to key freshwater processes may impact the juvenile life stage and ultimately population productivity is critical for conservation and management of this important species. Specifically, the results of this study will help optimize sampling methods for future monitoring and provide benchmark information to track changes in summer fish size and peak outmigration timing. This information may be useful for making in-season management decisions and forecasting future changes in Yukon River Chinook Salmon production.

ISBN: 9798379951962Subjects--Topical Terms:

3174300
Aquatic sciences.
Subjects--Index Terms:

Alaska

Influence of Freshwater Processes on Juvenile Chinook Salmon Size, Movement, and Outmigration Timing in the Chena River, Alaska.
LDR:04661nmm a2200409 4500 001 2393345
005 20240315085541.5
006 m o d
007 cr#unu||||||||
008 251215s2023 ||||||||||||||||| ||eng d
020 $a 9798379951962
035 $a (MiAaPQ)AAI30569229
035 $a AAI30569229
040 $a MiAaPQ $c MiAaPQ
100 1 $a Edwards, Olivia N. $3 3762798
245 1 0 $a Influence of Freshwater Processes on Juvenile Chinook Salmon Size, Movement, and Outmigration Timing in the Chena River, Alaska.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2023
300 $a 107 p.
500 $a Source: Masters Abstracts International, Volume: 85-01.
500 $a Advisor: Falke, Jeffrey.
502 $a Thesis (M.S.)--University of Alaska Fairbanks, 2023.
506 $a This item must not be sold to any third party vendors.
520 $a Chinook Salmon Oncorhynchus tshawytscha have experienced population declines across their range in recent decades, including Alaska where they are a critical subsistence, commercial, and sport fish species. The Alaska Board of Fisheries has listed Yukon River Chinook salmon as a "stock of yield concern" since 2000 prompting the implementation of escapement goals for key spawning tributaries in 2001. Additionally, research efforts across the basin have increased to better understand potential mechanisms behind these declines and provide information to facilitate management decisions. To help fill a critical data gap in the overall understanding of the fishery, this research investigated various freshwater juvenile life history factors including patterns in post-emergence summer body size, movement, and fish size during spring outmigration in the Chena River, Alaska. This research also identified links between these biological factors and freshwater processes that are affected by climate change, including stream temperature and discharge, with the intention of documenting benchmark information as conditions continue to change. Juvenile Chinook Salmon movement among four key rearing areas was observed during summer and fall 2019 and early spring 2020. Despite differences in early summer size patterns, by the end of September mean fork lengths were not statistically different among all rearing areas (ANOVA; all P > 0.05). Additionally, mean September weight varied among six years of empirical data and ranged from 3.19 g in 2018 (0.03 SE) to a maximum of 5.10 g in 2009 (0.05 SE). September weight was simulated across years with variable stream temperatures and discharge (2003 to 2020) using a bioenergetics model, and compared to observed data. Weight simulations were within <0.40 g of observed mean end of summer weight for all years except in 2019 when the predicted weight was 1.38 g greater than the observed mean September weight. Generally, both observed and simulated weights were lower in years with higher flows. Peak spring outmigration dates ranged from 13 to 29 May (mean = May 18 ± 2.6 d; 95% CI). Fish length, weight, and body condition during outmigration varied among years; fish were smallest in 2019 and largest in 2014. Catch per unit effort also varied with discharge and among years; typically, fewer fish were caught on days with higher discharge. In Spring 2020, catches were compared between minnow traps fished in close proximity to a continuously operating screw trap and found that the screw trap caught more and larger fish than minnow traps and was able to operate during periods of high discharge, while minnow traps had to be pulled. Climate change will continue to affect Chinook Salmon in the northern extent of their range via increasing variability in flow regimes and increasing water temperatures. Understanding how these changes to key freshwater processes may impact the juvenile life stage and ultimately population productivity is critical for conservation and management of this important species. Specifically, the results of this study will help optimize sampling methods for future monitoring and provide benchmark information to track changes in summer fish size and peak outmigration timing. This information may be useful for making in-season management decisions and forecasting future changes in Yukon River Chinook Salmon production.
590 $a School code: 0006.
650 4 $a Aquatic sciences. $3 3174300
650 4 $a Environmental science. $3 677245
650 4 $a Natural resource management. $3 589570
653 $a Alaska
653 $a Chena River
653 $a Chinook Salmon
653 $a Fisheries
653 $a Juvenile
653 $a Outmigration
690 $a 0792
690 $a 0768
690 $a 0528
710 2 $a University of Alaska Fairbanks. $b Fisheries. $3 3169766
773 0 $t Masters Abstracts International $g 85-01.
790 $a 0006
791 $a M.S.
792 $a 2023
793 $a English
856 4 0 $u https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=30569229