EARLY HEARING DETECTION AND INTERVENTION VIRTUAL CONFERENCE
MARCH 2-5, 2021

(Virtually the same conference, without elevators, airplane tickets, or hotel room keys)

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5/23/2018 | 9:00 AM - 9:15 AM | LANDSCAPE AND REACH SCALE INFLUENCES ON RESIDENT CUTTHROAT TROUT AND DOLLY VARDEN POPULATIONS IN SOUTHEAST ALASKA | 330 A

LANDSCAPE AND REACH SCALE INFLUENCES ON RESIDENT CUTTHROAT TROUT AND DOLLY VARDEN POPULATIONS IN SOUTHEAST ALASKA

Identifying and understanding relationships between fish and their physical habitat is key to managing watersheds and maintaining fish populations. Studies in the Pacific Northwest USA have focused on anadromous salmonids in watersheds subjected to multiple stressors such as logging, agriculture, or urbanization. We modeled resident cutthroat trout and Dolly Varden at 24 sites above barriers to upstream access in SE Alaska and over eleven years. These fish provide a unique opportunity to examine the influence of landscape conditions on fish distribution and morphology in relatively pristine habitats with unexploited fish populations and without the effects of the marine environment. We present models linking both instream characteristics, e.g., pool area or width depth ratio, and landscape drivers, e.g. elevation or distance to migration barrier, to the probability of fish presence, to the abundance of fish where present, and to fish length. We contrast models for the two species and explore landscape drivers of sympatry and competition. Results from this study provide both a clearer understanding of how landscapes control species distributions and important baseline information for management of forested watersheds.

Fish
Watershed
Modeling

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Presenters/Authors

E. Ashley Steel (), PNW Research Station, US Forest Service, asteel@fs.fed.us;