OREGON STATE UNIVERSITY

Trask

WRC Conference Abstracts
Apr-18-2013

Abstracts for (most) of the presentations given at the WRC Conference in April 2013.

DISCIPLINE: Disciplinary Results    STUDY: Alsea, Hinkle Creek, Trask    TYPE: Reports    TAGS: Abstracts, Conference
WRC Conference Agenda
Apr-18-2013

The agenda of the 2013 WRC Conference with presentation titles and speakers listed.

DISCIPLINE: Disciplinary Results    STUDY: Alsea, Hinkle Creek, Trask    TYPE: Reports    TAGS: Agenda, Conference, WRC
Arthropod Prey for Riparian Associated Birds in Headwater Forests of the Oregon Coast Range
Hagar J.C., J. Li, J. Sobota, S. Jenkins
Aug-19-2012

Streamside habitat is important for many terrestrial wildlife species. However, mechanisms underlying the riparian associations of some terrestrial species have not been well studied, particularly for headwater drainages. We investigated the diets of and food availability for four bird species associated with riparian habitats in montane coastal forests of western Oregon, USA. We examined variation in the availability of arthropod prey as a function of distance from stream. Specifically, we tested the hypotheses that (1) emergent aquatic insects were a food source for insectivorous birds in headwater riparian areas, and (2) the abundances of aquatic and terrestrial arthropod prey did not differ between streamside and upland areas during the bird breeding season. We found that although adult aquatic insects were available for consumption throughout the study period, they represented a relatively small proportion of available prey abundance and biomass and were present in only 1% of the diet samples from only one of the four riparian-associated bird species. Nonetheless, arthropod prey, comprised primarily of insects of terrestrial origin, was more abundant in streamside than upland samples. We conclude that food resources for birds in headwater riparian areas are primarily associated with terrestrial vegetation, and that bird distributions along the gradient from streamside to upland may be related to variation in arthropod prey availability.

DISCIPLINE: Wildlife    STUDY: Trask    TYPE: Journal Articles    TAGS: Bird, arthropod prey, aquatic insects, understory

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