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Data from: Fish carcasses alter subyearling Chinook salmon dispersal behavior and density but not growth in experimental mesocosms

Similar to many fish, juvenile Pacific salmon rearing in temperate streams face a growth and survival bottleneck early in their first summer due to limitations in space and food. Fish carcasses have been shown to affect juvenile salmon growth in many systems, but carcasses likely also alter behavioral and dispersal response of hatchery-origin young-of-the-year salmon. We tested the social and emigration response of subyearling chinook salmon to carcasses of Pacific lamprey or rainbow trout using semi-open flow-through mesocosm experiments. We expected the presence of carcasses to increase salmon growth and density while decreasing intraspecific aggression and downstream emigration compared to controls without carcasses. Consistent with expectations, salmon emigrated at lower rates when carcasses were present, resulting in significantly higher holding densities. Contrary to our expectations and results from previous studies, we did not detect differences in growth rate of juvenile salmon among treatments. Our findings suggest that indirect responses of consumers to concentrated resources may have measurable effects on density mediated by movement behaviors. Differences in lamprey and trout decomposition also suggest that carcass traits mediate the behavioral responses of consumers and incorporation of carcass subsidies into food webs.

Data and Resources

FieldValue
Modified
2021-07-19
Release Date
2021-07-15
Publisher
Identifier
081528e1-7dc8-471d-8c71-e3d4e49c2333
Spatial / Geographical Coverage Area
POLYGON ((-118.86962 45.656941, -118.86962 45.933181, -118.386061 45.933181, -118.386061 45.656941))
Spatial / Geographical Coverage Location
northeast Oregon
Temporal Coverage
Sunday, May 15, 2016 - 00:00 to Tuesday, August 15, 2017 - 00:00
Language
English (United States)
License
Author
Matthew R. Dunkle, Ryan A. Dunbeck, Christopher C. Caudill
Contact Name
Matthew R. Dunkle
Contact Email
Public Access Level
Public
DOI
10.7923/j1ns-ws38
Data available on:: 
Thursday, July 15, 2021