Individual Characteristics and Abiotic Factors Influence Out-Migration Dynamics of Juvenile Bull Trout
Fragmentation of rivers through anthropogenic modifications poses an imminent threat to the persistence of migratory fish, necessitating direct actions such as trap-and-haul programs to restore and conserve the migratory life-history component in populations of partially migratory species such as bu...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-11-01
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| Series: | Fishes |
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| Online Access: | https://www.mdpi.com/2410-3888/7/6/331 |
| _version_ | 1827639728079372288 |
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| author | Madeline C. Lewis Christopher S. Guy Eric W. Oldenburg Thomas E. McMahon |
| author_facet | Madeline C. Lewis Christopher S. Guy Eric W. Oldenburg Thomas E. McMahon |
| author_sort | Madeline C. Lewis |
| collection | DOAJ |
| description | Fragmentation of rivers through anthropogenic modifications poses an imminent threat to the persistence of migratory fish, necessitating direct actions such as trap-and-haul programs to restore and conserve the migratory life-history component in populations of partially migratory species such as bull trout <i>Salvelinus confluentus.</i> We used a PIT-tag system to assess how biological and abiotic factors influence the out-migration dynamics of juvenile bull trout in Graves Creek, Montana, USA. The largest fish within a cohort were more likely to out-migrate at age 1 when compared to smaller fish within the cohort, and this was particularly evident in a high-density year-class (2018), where large bull trout out-migrated an average of 115 days earlier than bull trout in the medium size category, and 181 days earlier than bull trout in the small size category. Relative changes in abiotic factors, including discharge, water temperature, and photoperiod, appeared to act as cues to out-migration, with the direction of change varying by season. These results highlight the complex interplay between individual characteristics, population dynamics, and environmental conditions, which influence out-migration dynamics and can be used to inform management actions to conserve the migratory component in bull trout populations. |
| first_indexed | 2024-03-09T16:45:13Z |
| format | Article |
| id | doaj.art-a14e3febb33b4310b37c054e9ede5935 |
| institution | Directory Open Access Journal |
| issn | 2410-3888 |
| language | English |
| last_indexed | 2024-03-09T16:45:13Z |
| publishDate | 2022-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Fishes |
| spelling | doaj.art-a14e3febb33b4310b37c054e9ede59352023-11-24T14:47:51ZengMDPI AGFishes2410-38882022-11-017633110.3390/fishes7060331Individual Characteristics and Abiotic Factors Influence Out-Migration Dynamics of Juvenile Bull TroutMadeline C. Lewis0Christopher S. Guy1Eric W. Oldenburg2Thomas E. McMahon3Montana Cooperative Fishery Research Unit, Department of Ecology, Montana State University, P.O. Box 173460, Bozeman, MT 59717, USAU.S. Geological Survey, Montana Cooperative Fishery Research Unit, Department of Ecology, Montana State University, P.O. Box 173460, Bozeman, MT 59717, USAAvista, Noxon Natural Resources Office, 94 Avista Power Road, Noxon, MT 59853, USADepartment of Ecology, Fish and Wildlife Ecology and Management Program, Montana State University, P.O. Box 173460, Bozeman, MT 59717, USAFragmentation of rivers through anthropogenic modifications poses an imminent threat to the persistence of migratory fish, necessitating direct actions such as trap-and-haul programs to restore and conserve the migratory life-history component in populations of partially migratory species such as bull trout <i>Salvelinus confluentus.</i> We used a PIT-tag system to assess how biological and abiotic factors influence the out-migration dynamics of juvenile bull trout in Graves Creek, Montana, USA. The largest fish within a cohort were more likely to out-migrate at age 1 when compared to smaller fish within the cohort, and this was particularly evident in a high-density year-class (2018), where large bull trout out-migrated an average of 115 days earlier than bull trout in the medium size category, and 181 days earlier than bull trout in the small size category. Relative changes in abiotic factors, including discharge, water temperature, and photoperiod, appeared to act as cues to out-migration, with the direction of change varying by season. These results highlight the complex interplay between individual characteristics, population dynamics, and environmental conditions, which influence out-migration dynamics and can be used to inform management actions to conserve the migratory component in bull trout populations.https://www.mdpi.com/2410-3888/7/6/331conservationmigrationlife-history |
| spellingShingle | Madeline C. Lewis Christopher S. Guy Eric W. Oldenburg Thomas E. McMahon Individual Characteristics and Abiotic Factors Influence Out-Migration Dynamics of Juvenile Bull Trout Fishes conservation migration life-history |
| title | Individual Characteristics and Abiotic Factors Influence Out-Migration Dynamics of Juvenile Bull Trout |
| title_full | Individual Characteristics and Abiotic Factors Influence Out-Migration Dynamics of Juvenile Bull Trout |
| title_fullStr | Individual Characteristics and Abiotic Factors Influence Out-Migration Dynamics of Juvenile Bull Trout |
| title_full_unstemmed | Individual Characteristics and Abiotic Factors Influence Out-Migration Dynamics of Juvenile Bull Trout |
| title_short | Individual Characteristics and Abiotic Factors Influence Out-Migration Dynamics of Juvenile Bull Trout |
| title_sort | individual characteristics and abiotic factors influence out migration dynamics of juvenile bull trout |
| topic | conservation migration life-history |
| url | https://www.mdpi.com/2410-3888/7/6/331 |
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