Many have heard about the connection between spotted owls and forest management in the Pacific Northwest, but most have no idea of the scientific studies that take place in the forest before management decisions are made.
This spring and summer, a small mammal study took place in the forests of Northern California. A research crew set out to study and document small mammal species occurrence and compare population estimates among various forest age classes.
Some of the small mammal species are recognized as prey for northern spotted owls. The researchers compared population estimates among different forest age classes. They also documented the correlation between small mammal species population estimates and various forest stand features like riparian zones and leave patches in managed stands.
Small mammals were trapped from early May to the middle of August with a web-based trapping design. Each web consisted of 5 spokes and 7 rows, for a total of 35 trapping nodes. The nodes were spaced from each other, with each node containing one small and one medium-sized (i.e., woodrat sized) live trap. Traps are baited with whole oats, sunflower seeds and raisins laced with peanut butter, the “icing on the cake”. The traps are set under or beside ground cover such as logs or heavy foliage and those at risk of exposure to direct sunlight are shaded.
Cotton bedding is supplied to all traps. Don’t want the little buggers getting cold at night. Traps are checked between sunrise and 11:00 and are locked open for the day after they are checked.
When a small mammal is caught, several procedures take place. First they are identified by specie, their weights are taken, their feet are measured (presumably for shoe size).
Their sex and reproductive age is determined and then they are tagged with a passive integrated transponder (PIT) tag. PIT tags are small capsules that contain microchips and are implanted under the skin on the hip of each animal as a marking method. Each tag has a unique identification code, which is recognized by a portable reader. Marked animals are released on site for potential recapture.
Studies like the Small Mammal Study are necessary for forest landowners to know how to make sound science-based management decisions. Our goal is to provide good habitat for all the species that live in the forest while providing the quality wood products we all use on a daily basis.
























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