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Space Use And Nesting Ecology Of Common Ravens (Corvus Corax) In Central Washignton State, Brandon A. Rossi
Space Use And Nesting Ecology Of Common Ravens (Corvus Corax) In Central Washignton State, Brandon A. Rossi
Master of Biology Theses
The ecology and space use of Common ravens (Corvus corax; hereafter ravens) is not well understood in the shrub-steppe of central Washington State. Raven populations have increased by more than 254% since 1990 in Washington State (North American Breeding Bird Survey; www.mbr-pwrc.usgs.gov/bbs/). Ravens in central Washington are implicated as top predators of a small endemic population of greater sage-grouse (Centrocercus urophasianus). Researchers have related increased raven populations to anthropogenic subsidies such as landfills, agriculture, and livestock operations. Analyzing movement can help researchers understand the characteristics of habitat that are important and potentially drive population fluctuations. We found that daily and …
Spacial Ecology, Behavior, And Habitat Use Of Terrestrial Coastal Giant Salamanders (Dicamptodon Tenebrosus) In The Central Washington Cascades, Brandon Fessler
Spacial Ecology, Behavior, And Habitat Use Of Terrestrial Coastal Giant Salamanders (Dicamptodon Tenebrosus) In The Central Washington Cascades, Brandon Fessler
Master of Biology Theses
I used radio-telemetry and remote camera monitoring ot investigate the terrestrial ecology Coastal Giant Salamanders (Dicamptodon tenebrosus). I tracked twelve salamanders an average of 319 days (range: 85-470) between June 2010 and September 2011. The majority of movements between tracking sessions were <20 m(85%, n= 209). The maximum movement distance observed was 271 m over three days. Camera monitoring showed D. tenebrosus move nocturnally, typically between 1900h and 0500h. Upland habitat use was common for D. tenebrosus, although all animals remained within 50 mof streams or seeps. Salamanders exhibited both range and refuge site fidelity; animals returned to previously occupied locations with wide variation ni the time (range: 6-381 days) and total distance traveled (range: 3-259 m) since last occupation. Salamanders were visible (both day and night) during 33.8% of radio-telemetry and 56.5% of camera monitoring sessions, typically seen facing out of refuge entrances.