Juvenile Salmonid Monitoring In Coastal Oregon and Lower Columbia Streams, 2012 Report Number: OPSW-ODFW-2013-1

Identification Information

Citation

Originator: Suring, E. and R. Constable

Publish Date: 2012

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 provides analysis of data from juvenile salmonid surveys in 2012, comparisons with results from previous years, and information on trends in juvenile salmonid distribution and abundance. Distribution metrics are specific to species and include site occupancy (the percent of sites with fish present) and pool frequency (average percent of pools per site with fish) for each Monitoring Area (MA), Evolutionarily Significant Unit (ESU) or Distinct Population Segment (DPS) in the project area. Abundance metrics are also specific to species and include the average density and population estimates in pools for each MA and ESU/DPS. Prior reports can be found at https://nrimp.dfw.state.or.us/crl/default.aspx?pn=WORP. Oregon Coast Coho (OCC) ESU density estimates were lower than in 2011. Pool population estimates and site occupancies were similar to 2011. We observed a small, but positive trend in occupancy and pool population estimates for coho across the ESU from 1998-2012. Within the four coastal monitoring areas, density and occupancy estimates were higher than the average from 1998-2011 in the Mid Coast MA, similar to the average in the Umpqua and North Coast, and lower in the Mid South. Pooling of data into three year “brood groups” indicated the current group had higher combined population estimates than the earliest two groups but was similar to 2004-2006 and 2007-2009. Site occupancy was higher in the current brood group than in any other group. Southern Oregon Northern California Coho (SONCC) ESU density and site occupancy estimates were the lowest recorded. Pool population estimates were similar to the average from 1998-2011. The current brood group had a higher population estimate than for 1998-2000, but the estimate was lower than all other brood groups. Site occupancy for current brood group was also lower than the other brood groups. Lower Columbia River Coho (LCR) density and pool population estimates were similar to 2011 and to the average from 2006-2011. Site occupancy was slightly below the average recorded from 2006-2011. Steelhead density, pool population, and pool occupancy estimates were similar to previous years in the Oregon Coast DPS. Site occupancies for the Oregon Coast DPS were the higher than average and similar to 2011. In the Klamath Mountain Province (KMP) DPS, steelhead density and pool frequency estimates were the lowest recorded. Population estimates were similar to the average and to 2011. Site occupancy was similar to the average condition and to 2011, however the estimates for the past 3 years have been the 2nd, 3rd, and 4th lowest estimates, respectively. Steelhead density estimates in the LCR and the Southwest Washington (SWW) DPSs were similar to each other and to the average and 2011 estimates for the DPSs. Site occupancy in the LCR was similar to 2011 and to the overall average. Site occupancy in SWW was higher than in 2011 and the overall average. Population estimates for both DPSs were similar to 2011 and to the overall average. Analyses which included shallower pools produced higher site occupancies in the Umpqua, Mid Coast and LCR for coho and in the Umpqua and the KMP for steelhead. Pool population estimates also increased with the addition of the smaller pools and had proportionately smaller confidence intervals.

Purpose:

Time Period of Content: 2004-2012

Geographic Extent: Klamath Mountain Province, Lower Columbia River

Status: Final

Use Constraints:

Format: PDF File

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Is a physical copy maintained for reference at Headquarters? Yes