Juvenile Salmonid Monitoring In Coastal Oregon and Lower Columbia Streams, 2014 Report Number: OPSW-ODFW-2015-1

Identification Information

Citation

Originator: Suring, E., and R. Constable

Publish Date: 2014

Online Link: None

BPA Project #:

Contact Information

Agency: Oregon Department of Fish and Wildlife

Name: Ronald Constable

Job Position: NRS-2 Assistant Project Leader

Telephone: 541-757-5107

E-Mail Address: ron.constable@oregonstate.edu

Description

Abstract: This report analyzes data from juvenile salmonid surveys across coastal Oregon in 2014. Results from 2014 are compared with results from previous years and used to describe trends in juvenile salmonid distribution and abundance for the three coho Evolutionarily Significant Units (ESU) and the four steelhead Distinct Population Segments (DPS) in coastal Oregon. For prior reports visit https://nrimp.dfw.state.or.us/crl/default.aspx?pn=WORP. The Oregon Coast Coho (OCC) ESU density estimate in 2014 was lower than the recorded high estimate in 2013. The 2014 density estimate was also lower than the 1998-2013 average for the ESU. Site occupancy in 2014 was similar to 2013. Occupancy rates appear to be increasing for the ESU since the start of monitoring in 1998. The pool population estimate in 2014 was lower than in 2013 and lower than the average of the cohorts from 2010-2012. In the OCC ESU plots of parr abundance with female spawner abundance suggest limits in freshwater habitat to parr production when spawner abundance exceeds approximately 80,000 females. Parr production rates typically decrease when female spawner abundance increases. The Southern Oregon Northern California Coho (SONCC) ESU density estimate in 2014 was similar to the 2013 estimate. The 2014 density estimate was lower than the average for the ESU from 1998-2013. Site occupancy in 2014 was similar to 2013. Occupancy estimates for the last 3 cohorts have been the lowest recorded since monitoring began. Pool population estimates were similar to 2013, but lower than in most years, with the exception of the estimates from 1998-2000. Lower Columbia River Coho (LCR) density, site occupancy, and pool population estimates were similar to 2013 and to the average since 2006. The Oregon Coast Steelhead DPS density estimate in 2014 was lower than 2013 but similar to the average from 2002-2013. Pool population estimates in 2014 were similar to 2013 and to the 2002-2013 average. The site occupancy estimate in 2014 was the highest recorded. The last four cohorts have had the four highest occupancy estimates. In the Klamath Mountain Province (KMP) DPS, steelhead density in 2014 was higher than the record low estimate in 2013 and similar to the DPS average from 2002-2013. The pool population estimate in 2014 was lower than 2013, but similar to the average from 2002-2013. Site occupancy was similar to 2013 and to the 2002-2013 average for the DPS. Steelhead density estimates in the LCR and the Southwest Washington (SWW) DPSs in 2014 were similar to each other, to averages for each DPS since 2006, and to the 2013 estimates. Site occupancy in 2014 for the LCR DPS was the highest recorded. In the SWW DPS site occupancy was similar to 2013 and to the 2006-2013 average estimates. Pool population estimates for LCR and SWW were similar to the 2006-2013 average of the estimates for the DPSs and to 2013 estimates. The original pool depth criteria was =40cm in maximum depth. This was changed to =20cm in 2010. Analyses based on the =20cm maximum depth criteria produced larger pool population estimates with proportionately smaller confidence intervals than analyses based on the =40cm maximum depth criteria. Population estimate trends that included shallow pools tracked with those based on the former pool criteria.

Purpose:

Time Period of Content: 1998-2014

Geographic Extent: Klamath Mountain Province, Oregon Coast

Status: Final

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Format: PDF File

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Is a physical copy maintained for reference at Headquarters? No