Woody debris and channel morphology in first- and second-order forested channels in Washington's coast ranges

2002 ◽  
Vol 38 (9) ◽  
pp. 16-1-16-14 ◽  
Author(s):  
C. Rhett Jackson ◽  
Christopher A. Sturm
Keyword(s):  
Woody Debris ◽  
Channel Morphology ◽  
Second Order ◽  
Coast Ranges

Function and dynamics of woody debris in stream reaches in the central Sierra Nevada, California

1998 ◽  
Vol 55 (8) ◽  
pp. 1807-1820 ◽  
Author(s):  
Neil Berg ◽  
Ann Carlson ◽  
David Azuma
Keyword(s):  
Sierra Nevada ◽  
Deep Water ◽  
Stream Flow ◽  
Woody Debris ◽  
Channel Morphology ◽  
High Flow ◽  
Cover Type ◽  
Sediment Volume ◽  
The Stability ◽  
Channel Type

In 1993, we located, measured, and tagged almost 1700 woody debris pieces on six streams in California’s central Sierra Nevada. The stability, geomorphic function, and use by fish for cover of each piece were recorded. In 1994 and 1995, piece movement was quantified and new debris pieces were measured. In the 60 study reaches, debris was not influential in shaping channel morphology and fish cover. Although woody debris was often associated with habitat units, few pieces deflected flow or contributed to the formation of pools or steps. Fish used deep water as cover more often than debris or any other cover type. Medium-sized debris was, however, used in a greater proportion than its availability to fish. Little sediment was stored by debris, and five large pieces stored 85% of the sediment volume measured. Debris frequency and volume did not differ significantly by channel type. After a low stream flow year (1993–1994), few pieces had moved and few new pieces were identified. After a high-flow season (1994–1995), 31% of the pieces had either moved or were not found and new pieces represented over 5% of the originally surveyed volume of wood.

Influence of large woody debris on retention, immigration, and growth of coastal cutthroat trout (Oncorhynchus clarki clarki) in stream pools

1998 ◽  
Vol 55 (8) ◽  
pp. 1902-1908 ◽  
Author(s):  
Bret C Harvey
Keyword(s):  
Woody Debris ◽  
Cutthroat Trout ◽  
Second Order ◽  
Large Woody Debris ◽  
Anadromous Fish ◽  
Oncorhynchus Clarki ◽  
Third Order ◽  
The Third ◽  
Oncorhynchus Clarki Clarki ◽  
Coastal Cutthroat Trout

Over 4 months and about 1 year, coastal cutthroat trout (Oncorhynchus clarki clarki) age-1 in Little Jones Creek, California, remained at similar rates in pools with and without large woody debris. This result was based on attempts in July and November 1995 to collect and tag all fish in 22 pools and three collections of fish from the same pools in November 1995, May 1996, and August 1996. Retention of fish appeared to be greater in pools with large woody debris in May 1996. The presence of large woody debris in pools did not influence immigration or growth of cutthroat trout. However, both immigration and growth increased downstream over the 3850-m study reach. Low retention and substantial immigration of cutthroat trout into experimental pools indicate that movement is important in the dynamics of this population. First- and second-order channels appear to be important sources of fish for the third-order study reach, while the study reach may export significant numbers of fish to downstream reaches accessible to anadromous fish.

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