Factors influencing chinook salmon spawning distribution in the Togiak River, Alaska

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Show simple item record Meggers, Stephanie L. 2019-06-06T23:51:55Z 2019-06-06T23:51:55Z 2018-12
dc.description Thesis (M.S.) University of Alaska Fairbanks, 2018 en_US
dc.description.abstract Salmonids are heavily dependent on specific habitat characteristics for survival, yet few studies in Alaska have examined the relationship between habitat and spawning distribution, using remote sensing approaches. To better understand the relationship between Chinook Salmon Oncorhynchus tshawytscha spawning distribution and environmental variables like habitat type (e.g., run, riffle, pool), temperature, and proximity to channel islands, optical and thermal imagery were collected on the Togiak and Ongivinuk rivers in southwest Alaska. Object-based image analysis was used to classify and quantify habitat types, while thermal characteristics and the proximity of spawning locations to channel islands were determined in a GIS framework. Object-based image analysis was useful for classifying habitat and may provide a better alternative to pixel-based image analysis. However, rule sets were nontransferable and inconsistent among river reaches, and caution should be taken when these methods are used on large river sections. Chinook Salmon showed a preference for spawning in river runs, 80% of fish spawned in water temperatures between 8.6° and 9.4°C, and nearly 61% of Chinook Salmon spawned within 100 m of a channel island. This study provided a baseline understanding of environmental correlates of spawning for Chinook Salmon at the northern extent of their range. en_US
dc.description.sponsorship U.S. Fish and Wildlife Service Office of Subsistence Management and the National Fish Habitat Action Plan en_US
dc.language.iso en en_US
dc.subject Chinook salmon en_US
dc.subject habitat en_US
dc.subject spawning en_US
dc.subject Alaska en_US
dc.subject Togiak National Wildlife Refuge en_US
dc.title Factors influencing chinook salmon spawning distribution in the Togiak River, Alaska en_US
dc.type Thesis en_US ms en_US
dc.identifier.department Department of Fisheries en_US
dc.contributor.chair Seitz, Andrew
dc.contributor.chair Prakash, Anupma
dc.contributor.committee Lopez, Andres
dc.contributor.committee Tanner, Theresa

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