國立虎尾科技大學 |

Evaluation of Growth and Migration Trends on the Survival and Recruitment of Chinook Salmon in Southeastern Alaska Rivers.

紀錄類型:	書目-語言資料,手稿 : Monograph/item
正題名/作者:	Evaluation of Growth and Migration Trends on the Survival and Recruitment of Chinook Salmon in Southeastern Alaska Rivers./
作者:	Berkman, Stephanie.
面頁冊數:	1 online resource (124 pages)
附註:	Source: Masters Abstracts International, Volume: 57-01.
標題:	Biology. -
電子資源:	click for full text (PQDT)
ISBN:	9780355538717

Evaluation of Growth and Migration Trends on the Survival and Recruitment of Chinook Salmon in Southeastern Alaska Rivers.
Berkman, Stephanie.

Evaluation of Growth and Migration Trends on the Survival and Recruitment of Chinook Salmon in Southeastern Alaska Rivers. - 1 online resource (124 pages)

Source: Masters Abstracts International, Volume: 57-01.

Thesis (M.S.)--University of Alaska Fairbanks, 2017.

Includes bibliographical references

Highly variable recruitment and declines in productivity and abundance of Chinook Salmon Oncorhynchus tshawytscha have created economic and cultural hardships for communities throughout Alaska. Although pre- and post-smolt growth are important for determining brood-year (BY) survival and productivity for Pacific salmon through size-mediated mortality, these relationships remain unclear for Chinook Salmon. As a result, it is necessary to better understand the relationships between environmental and biological factors that influence freshwater and marine growth, smolt outmigrations, and recruitment success. This study used retrospective growth to identify the importance of annual growth in determining BY survival and recruitment, determine if growth dependency between growth zones was present, and examine growth differences among age classes for Chinook Salmon in the Chilkat (BYs 1985--2007) and Stikine (BYs 1991--1998 and 2000--2007) rivers. Biological and environmental factors were also assessed to determine their influence on freshwater smolt production, smolt outmigration, and marine survival. Greater first-year marine growth was correlated with higher BY total return and productivity for Chinook Salmon from the Chilkat River and higher BY marine survival for Chinook Salmon from the Stikine River. Daily smolt outmigration of Chilkat River Chinook Salmon was positively correlated to water temperature and negatively correlated to discharge (Deviance explained = 68.5%), while timing of the start of outmigration was influenced by nearshore sea surface temperatures (R2 = 0.57) and timing of the mid and end points were positively related to smolt length (R2 = 0.72 and 0.34, respectively). Freshwater smolt production was negatively correlated to parr length and fall discharge and positively correlated to spring temperature and discharge (R 2adj = 0.52). Marine survival of Stikine River Chinook Salmon was significantly related to smolt size (R2 = 0.26), while Chilkat River Chinook Salmon were positively related to migration timing and smolt length and negatively related to discharge (R2 = 0.5). These results support the importance of the early marine period in determining year-class strength and highlight the variation in mechanisms that influence recruitment success of Chinook Salmon stocks.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2018

Mode of access: World Wide Web

ISBN: 9780355538717Subjects--Topical Terms:

599573
Biology.
Index Terms--Genre/Form:

554714
Electronic books.

Evaluation of Growth and Migration Trends on the Survival and Recruitment of Chinook Salmon in Southeastern Alaska Rivers.
LDR:03538ntm a2200337K 4500 001 913363
005 20180618102637.5
006 m o u
007 cr mn||||a|a||
008 190606s2017 xx obm 000 0 eng d
020 $a 9780355538717
035 $a (MiAaPQ)AAI10639925
035 $a (MiAaPQ)uaf:10726
035 $a AAI10639925
040 $a MiAaPQ $b eng $c MiAaPQ
100 1 $a Berkman, Stephanie. $3 1186174
245 1 0 $a Evaluation of Growth and Migration Trends on the Survival and Recruitment of Chinook Salmon in Southeastern Alaska Rivers.
264 0 $c 2017
300 $a 1 online resource (124 pages)
336 $a text $b txt $2 rdacontent
337 $a computer $b c $2 rdamedia
338 $a online resource $b cr $2 rdacarrier
500 $a Source: Masters Abstracts International, Volume: 57-01.
500 $a Adviser: Trent M. Sutton.
502 $a Thesis (M.S.)--University of Alaska Fairbanks, 2017.
504 $a Includes bibliographical references
520 $a Highly variable recruitment and declines in productivity and abundance of Chinook Salmon Oncorhynchus tshawytscha have created economic and cultural hardships for communities throughout Alaska. Although pre- and post-smolt growth are important for determining brood-year (BY) survival and productivity for Pacific salmon through size-mediated mortality, these relationships remain unclear for Chinook Salmon. As a result, it is necessary to better understand the relationships between environmental and biological factors that influence freshwater and marine growth, smolt outmigrations, and recruitment success. This study used retrospective growth to identify the importance of annual growth in determining BY survival and recruitment, determine if growth dependency between growth zones was present, and examine growth differences among age classes for Chinook Salmon in the Chilkat (BYs 1985--2007) and Stikine (BYs 1991--1998 and 2000--2007) rivers. Biological and environmental factors were also assessed to determine their influence on freshwater smolt production, smolt outmigration, and marine survival. Greater first-year marine growth was correlated with higher BY total return and productivity for Chinook Salmon from the Chilkat River and higher BY marine survival for Chinook Salmon from the Stikine River. Daily smolt outmigration of Chilkat River Chinook Salmon was positively correlated to water temperature and negatively correlated to discharge (Deviance explained = 68.5%), while timing of the start of outmigration was influenced by nearshore sea surface temperatures (R2 = 0.57) and timing of the mid and end points were positively related to smolt length (R2 = 0.72 and 0.34, respectively). Freshwater smolt production was negatively correlated to parr length and fall discharge and positively correlated to spring temperature and discharge (R 2adj = 0.52). Marine survival of Stikine River Chinook Salmon was significantly related to smolt size (R2 = 0.26), while Chilkat River Chinook Salmon were positively related to migration timing and smolt length and negatively related to discharge (R2 = 0.5). These results support the importance of the early marine period in determining year-class strength and highlight the variation in mechanisms that influence recruitment success of Chinook Salmon stocks.
533 $a Electronic reproduction. $b Ann Arbor, Mich. : $c ProQuest, $d 2018
538 $a Mode of access: World Wide Web
650 4 $a Biology. $3 599573
650 4 $a Natural resource management. $3 1178831
650 4 $a Ecology. $3 575279
655 7 $a Electronic books. $2 local $3 554714
690 $a 0306
690 $a 0528
690 $a 0329
710 2 $a ProQuest Information and Learning Co. $3 1178819
710 2 $a University of Alaska Fairbanks. $b Fisheries. $3 1186029
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10639925 $z click for full text (PQDT)