Population Dynamics Of Small Mammals In Relation To Production Of Cones In Four Types Of Forests In the Northern Sierra Nevada, California

摘要: We studied assemblages of small mammals in four types coniferous forest (white fir, red mixed-fir, and pine-cedar) the Sierra Nevada California for 2 field seasons (2003-2004). assessed production cones by dominant species conifers both years. Production was greater overall autumn 2003, but varied within type between conifers. Parallel to this, mean maximum densities North American deermice (Peromyscus maniculatus) increased 2004 (from 0.7-7.3 individuals/ha 65.7-112.7 individuals/ha). Size populations golden-mantled ground squirrels (Spermophilus lateralis) were similar years; typical hibernating species, this taxon occurred at low May (6.6 6 0.2), peak September (24.5-32.5 individuals/ha), their declined October (9.2 4.8). Long-eared chipmunks (Tamias quadrimaculatus) reached higher fir (48.2 13.4 individuals/ha) mixed-fir forests (36.0 13.5 than white (7.6 2.7 all peaked September. Shadow senex) remained lower T. quadrimaculatus except during 2004, when they high (54.6 26.8 Survival P. maniculatus dependant on an interaction month, with additive effects over-winter survival 2003. S. lateralis whereas Tamias plus additional