Technical Report
 

Pine regeneration in Oregon : habits and control of seed-eating mammals

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  • A 4-year investigation of the habits and population densities of small seed-eating mammals was made in central Oregon as a basis for possible control measures to encourage regeneration of economically desirable tree species. The study concentrated on the chipmunk, ground squirrel, and mouse in an area chosen as average in ability to regener­ate naturally. Live-trapping and tagging determined estimates of population. Baiting the area with wheat soaked in 1080 or thallous sulfate and further trapping produced data which indicated that these poisons may be only initially effective in reducing populations of seed-eating animals, because the area was soon invaded by outside populations. More fre­quent baiting on a larger area might produce better results. Success in population reduction depends upon place and time of baiting in relation to habits of different animals. Chemical treatment of pine seed with tetramine or endrin as a repellent appeared to offer some protection for the individual seed. The most effective assistance to regeneration in central Oregon is probably a combination of baiting for population reduction, treating seed to repel seed eaters, and removing debris which provides protection for them.
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