2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/23/2018 | 10:00 AM - 10:15 AM | HOW DO SMALL BARRIERS AND STREAM FLOW INTERACT TO STRUCTURE PARTIALLY MIGRATORY FISH POPULATIONS? | 320
HOW DO SMALL BARRIERS AND STREAM FLOW INTERACT TO STRUCTURE PARTIALLY MIGRATORY FISH POPULATIONS?
Partial migration is a common phenomenon in migratory populations wherein only some individuals migrate. In Oncorhynchus mykiss, a partially migratory salmonid fish, migratory individuals travel to the ocean before returning to freshwater to breed (‘steelhead’), while resident individuals remain in freshwater (‘rainbow’ trout). We are studying how small waterfalls interact with stream flow to structure the spatial (upstream-downstream) distribution of resident and migratory fish in tributaries to the South Fork Eel River, California. We collected tissue samples from O. mykiss distributed along the entire length of two tributary streams in four years. We used >300 single nucleotide polymorphisms (SNPs) on a region of the genome that is strongly correlated with migration in O. mykiss to explore the spatial distribution of resident vs. migratory genotypes in these two streams. Our preliminary results suggest one waterfall, which is passable by adult steelhead under some stream flows, reduced the frequency of migratory alleles from 52% below to 38% above the waterfall. Our ongoing research explores how inter-annual variation in hydrologic conditions influences the ability of this waterfall to act as barrier to upstream migrating steelhead and, hence, the spatial distribution of migratory juveniles.
- Genetics
- Fish
- Life History
Presentation:
This presentation has not yet been uploaded.
Handouts:
Handout is not Available
Transcripts:
CART transcripts are NOT YET available, but will be posted shortly after the conference
Presenters/Authors
Suzanne Kelson
(), University of Nevada, Reno, skelson@unr.edu;
ASHA DISCLOSURE:
Financial -
Nonfinancial -
Michael Miller
(), University of California Davis, micmiller@ucdavis.edu ;
ASHA DISCLOSURE:
Financial -
Nonfinancial -
Stephanie Carlson
(), Department of Environmental Science, Policy, and Management, University of California, Berkeley, California, U.S., smcarlson@berkeley.edu;
ASHA DISCLOSURE:
Financial -
Nonfinancial -