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Contributed by Museum of Vertebrate Zoology, University of California, Berkeley.
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Transcription
Koford, R.
1926
Journal
White Cloud campground, 4300 ft., 11 mi. E Nevada City (by rd.), Nevada Co., Calif.
16 April That was the only call I heard all day. I saw one other squirrel go into a hole in an oak near F2. It was a cold, windy day. Wind was gusty, up to over 20 mph. Cloud cover ~50%, moving rapidly to the south, clearing up in the late afternoon. Temp. 47° F at 1400, 38° F at 1830.
There was a light layer of crusty snow over about 50% of the ground – walking was crunchy in the morning. Little pieces of ice fell from the trees all day. I found several mushrooms frozen in place. Also, tips from Douglas Fir's littered the ground in places.
The sun left the tree tops at 1845.
17 April I spent 0540-0815, 0930-1330, 1500-1545, 1630-1835 in the study area, hearing 12 chirring calls. I opened the traps at 0200, closed them at 1630. In order to determine how much, if at all, the Flying Squirrel are contributing to the Douglas Fir tips which litter the ground and to see what the rate of cutting by Clickerers was, I cleared the ground under 14 Douglas Fir of tips. 2956 were removed by 1300 hrs. Others which appeared in the afternoon were cleared at 1830. Also, I timed how long it took a squirrel to eat the strobili. 7 were eaten in 67 seconds; 8 in about 75 seconds; 2 in 25 seconds. Thus, it seems that ~10 sec. is the typical time per strobilus.
Not all Douglas Fir are hit as hard as the tree I cleared under. Some have only a couple tips under them.
Wind light, sky overcast most of day. Temp. 32° F at 0545, 51° F at 1330, 48° F at 1845.
First frost on tree tops at 1545.