Type of Presentation

Poster

Session Title

General Habitat Topics

Description

Juvenile Chinook use non-natal coastal streams in Puget Sound as rearing habitat. In 2013 an extensive sampling effort was conducted to identify key landscape and site characteristics that might be used to predict which coastal streams juvenile Chinook would use for rearing. Distance from natal river systems, stream gradient where juvenile Chinook were present, and watershed area characteristics were used to develop a preliminary multiple regression model to predict log transformed Chinook presence in coastal streams in the Whidbey Basin. Results of the model run did not provide reliable probability values due to the limited amount of sampling data (only one year of extensive data and many streams with no fish due to culverts) that could be used in calculating the regression coefficients for the model. However, the model does provide a gradational reference for identifying coastal streams more or less likely to have juvenile Chinook rearing and has potential application in prioritizing streams for investigation of juvenile Chinook presence, restoration, and protection.

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Developing a Predictive Multiple Regression Model to Identify Non-Natal Coastal Streams in the Puget Sound Utilized by Juvenile Chinook

2016SSEC

Juvenile Chinook use non-natal coastal streams in Puget Sound as rearing habitat. In 2013 an extensive sampling effort was conducted to identify key landscape and site characteristics that might be used to predict which coastal streams juvenile Chinook would use for rearing. Distance from natal river systems, stream gradient where juvenile Chinook were present, and watershed area characteristics were used to develop a preliminary multiple regression model to predict log transformed Chinook presence in coastal streams in the Whidbey Basin. Results of the model run did not provide reliable probability values due to the limited amount of sampling data (only one year of extensive data and many streams with no fish due to culverts) that could be used in calculating the regression coefficients for the model. However, the model does provide a gradational reference for identifying coastal streams more or less likely to have juvenile Chinook rearing and has potential application in prioritizing streams for investigation of juvenile Chinook presence, restoration, and protection.