. Bulletin. Science; Natural history; Natural history. 128 SOUTHERN CALIFORNIA ACADEMY OF SCIENCES le 12- >- TOP UPSWEEP ORIGIN. TERMINAL PULSE BOTTOM OF DOWNSWEEP LENGTH (S) Fig. 2. Diagram of the parameters of the chip used for statistical analysis in this study. The terminal pulse was found to follow the chip of the San Jacinto populations of Tamias merriami. Calls of both species were recorded in areas of sympatry of Tamias obscurus and T. merriami. Calls recorded at Columbia are from a population of Tamias mer- riami whose distribution is continuous with T. merriami and T. obscurus in
. Bulletin. Science; Natural history; Natural history. 128 SOUTHERN CALIFORNIA ACADEMY OF SCIENCES le 12- >- TOP UPSWEEP ORIGIN. TERMINAL PULSE BOTTOM OF DOWNSWEEP LENGTH (S) Fig. 2. Diagram of the parameters of the chip used for statistical analysis in this study. The terminal pulse was found to follow the chip of the San Jacinto populations of Tamias merriami. Calls of both species were recorded in areas of sympatry of Tamias obscurus and T. merriami. Calls recorded at Columbia are from a population of Tamias mer- riami whose distribution is continuous with T. merriami and T. obscurus in the San Bernardino Mountains and allopatric with respect to Tamias obscurus and T. merriami in the San Jacinto Mountains (see Fig. 1, Hall 1981). Methods Spontaneous vocalizations were recorded while traversing roads and trails in the San Bernardino and San Jacinto Mountains. Calls of chipmunks were recorded from individuals spontaneously vocalizing as we approached within recording range. All chipmunks calling in this context were recorded without our knowledge of sex and weight during the same season in all of the study sites in an effort to avoid collecting data representing entirely individuals of any one age or size class. The distribution of the chipmunks and their cryptic coloration required that animals be collected and identified and bacula preserved according to Friley (1947) in the study areas prior to recording. Recording areas were selected in which species boundaries were sharp enough (see Blankenship 1985 for habitat descrip- tion and distribution of the two species) in areas of sympatry (or parapatry) and recording was done away from these borders as was necessary to ensure the identity of the callers. In order to avoid recording calls repeatedly from the same individual, each area was traversed for several Km only once. These recordings were then compared with populations of Tamias merriami from Columbia and the San Bernardino Mountains (Brand 1970, and unpubli
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