Channels that were scoured to bedrock by debris flows provided unique
opportunities to calculate the rate of sediment and wood accumulation, to make
inferences about processes associated with input and transport of sediment, and to gain
insight into the temporal succession of channel morphology following disturbance. In an
In an effort to identify seasonal distribution patterns and habitat requirements of coastal
cutthroat trout Oncorhynchus clarki clarki, movement of tagged and marked individuals
(35 radio-tagged, 753 PIT-tagged, and 5,322 fin-clipped) was monitored over a 14-month
period in an isolated watershed in southwestern Oregon. Emigration out of the basin was...
Mark-recapture methods were used to examine watershed-scale survival rates of coastal cutthroat trout (Oncorhynchus clarkii clarkii) from two headwater stream networks located in the foothills of the Cascade Mountain Range, Oregon. Differences in survival were explored among spatial (stream segment, stream network [main stem or tributaries], and watershed) and temporal...
Wildfire is a largely terrestrial perturbation broadly recognized as an agent of disturbance and ecological change in forested biomes. Effects of post-fire conditions on biotic components of aquatic systems have been less well-documented, although hypothetically, the two are strongly connected. In fact, the influence of wildfire may be most profound...
Radiotelemetry was used to study the seasonal movements and habitat use
of adult westslope cutthroat trout Oncorhynchus clarki lewisi in Roberts
Creek and Rail Creek, headwater tributaries of the John Day River, Oregon,
from September 2000 to December 2001. The objectives were to (1)
describe adult cutthroat trout life history...
The distribution of Lahontan cutthroat trout Oncorhynchus clarki henshawi was assessed
in a high-desert stream in southeastern Oregon where beaver Castor canadensis are
abundant. Longitudinal patterns of beaver ponds, habitat, temperature, and Lahontan
cutthroat trout age group distribution were identified throughout Willow Creek. Three
distinct stream segments were classified based...
Current riparian management objectives in the Pacific Northwest promote both
retention of existing conifers and conversion of hardwood-dominated areas to conifers.
Although understanding of relationships between riparian vegetation and salmonid
prey availability is growing, temporal variation in these relationships is poorly
understood. Seasonal fluxes in availability of aquatic and terrestrial...
Although the effects of extrinsic barriers to dispersal have increasingly been shown to
play a large role in the structuring of contemporary genetic diversity, describing the
relationship between landscape structure, stochastic disturbance, and genetic diversity
remains a major challenge. Here, environmental features for 27 barrier-isolated
populations (2,232 individuals) of coastal...
Seasonal emergent wetlands in the Pacific Northwest have not been regarded
traditionally as fish rearing habitat, despite access to such habitat when river flows
overtop riverbanks and connect to the floodplain. As a result, restoration and
enhancement projects to remediate for the loss of such wetland habitat are being
Because human land use activities often result in increased fragmentation of
headwater stream habitats, a better understanding of the effects of fragmentation on
the genetic heterogeneity of stream salmonids is useful for effective management.
We used eight microsatellites to examine the genetic structure of potamodromous
coastal cutthroat trout (Oncorhynchus clarki...