Pacific Northwest

A catchment-scale assessment of stream temperature response to contemporary forest harvesting in the Oregon Coast Range
Bladon, K.D., N.A. Cook, J.T. Light, and C. Segura

The Alsea Watershed Study Revisited in the Oregon Coast Range provided a unique opportunity to investigate and compare the stream temperature responses to contemporary forest harvesting practices (i.e., maintenance of riparian vegetation) with the impacts from historical (1960s) harvesting practices (i.e., no riparian vegetation).

DISCIPLINE: Hydrology & Water Quality    STUDY: Alsea    TYPE: Journal Articles    TAGS: Alsea, Forest management, Headwater stream, Pacific Northwest, Riparian buffers, Thermal regime, Water temperature
Post-breeding habitat selection by songbirds in the headwaters of the Trask River, northwestern Oregon
Jenkins, Stephanie R.

Little is known on the importance of riparian areas to birds near small headwater streams in mesic forests. Progress towards understanding limiting factors that affect bird populations has been difficult because of lack of information beyond the breeding period. I compared bird assemblages between headwater riparian and upland areas throughout the post-breeding period by capturing birds using mist-nets in six paired riparian and upland locations along six headwater streams of the Trask River in northwestern Oregon. In order to assess whether birds prefer headwater riparian areas, I also examined factors affecting habitat selection by juvenile Swainson's thrushes (n=37) using radio telemetry. While riparian and upland locations had similar coarse wood volume and fruiting and tall (> 1.3 m tall) shrub cover, riparian locations had less shrub cover (< 1.3 m tall) and different shrub composition than upland locations. Total capture rate was double that of upland in riparian locations, while bird species richness was similar. Similar numbers of birds were captured in mist-nets oriented perpendicular and parallel to the stream suggesting that birds were not using riparian areas as movement corridors. Adult capture rate was greater in riparian locations than adjacent uplands while results of juvenile capture rates were ambiguous. Riparian locations supported higher capture rates of Swainson's thrushes and winter wrens than adjacent uplands.

DISCIPLINE: Wildlife    STUDY: Trask    TYPE: Theses    TAGS: Songbirds, habitat, Breeding, Wildlife, Oregon, Trask, Riparian, Bird, Pacific Northwest, Landscape Ecology, Radio Telemetry, Bird Assemblages, Forest management, Mist Net
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