thumbnail

Spatial consistency of chinook salmon redd distribution within and among years in the Cowlitz River, Washington

North American Journal of Fisheries Management

By:
, , , and
DOI: 10.1080/02755947.2013.778924

Links

Abstract

We investigated the spawning patterns of Chinook Salmon Oncorhynchus tshawytscha on the lower Cowlitz River, Washington, using a unique set of fine- and coarse-scale temporal and spatial data collected during biweekly aerial surveys conducted in 1991–2009 (500 m to 28 km resolution) and 2008–2009 (100–500 m resolution). Redd locations were mapped from a helicopter during 2008 and 2009 with a hand-held GPS synchronized with in-flight audio recordings. We examined spatial patterns of Chinook Salmon redd reoccupation among and within years in relation to segment-scale geomorphic features. Chinook Salmon spawned in the same sections each year with little variation among years. On a coarse scale, 5 years (1993, 1998, 2000, 2002, and 2009) were compared for reoccupation. Redd locations were highly correlated among years. Comparisons on a fine scale (500 m) between 2008 and 2009 also revealed a high degree of consistency among redd locations. On a finer temporal scale, we observed that Chinook Salmon spawned in the same sections during the first and last week. Redds were clustered in both 2008 and 2009. Regression analysis with a generalized linear model at the 500-m scale indicated that river kilometer and channel bifurcation were positively associated with redd density, whereas sinuosity was negatively associated with redd density. Collecting data on specific redd locations with a GPS during aerial surveys was logistically feasible and cost effective and greatly enhanced the spatial precision of Chinook Salmon spawning surveys.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Spatial consistency of chinook salmon redd distribution within and among years in the Cowlitz River, Washington
Series title:
North American Journal of Fisheries Management
DOI:
10.1080/02755947.2013.778924
Volume
33
Issue:
3
Year Published:
2013
Language:
English
Publisher:
Taylor & Francis
Contributing office(s):
Forest and Rangeland Ecosystem Science Center
Description:
11 p.
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
North American Journal of Fisheries Management
First page:
508
Last page:
518
Country:
United States