| dialects in elephatn seals. | threat vocalizations of male elephant seals mirounga angustirostris vary among four populations on islands off the coast of california and baja california, mexico. males at san nicolas island in southern california emit sound pulses at more than double the rate of males at aũo nuevo island, 528 kilometers north. mean pulse rates at san miguel island and isla de guadalupe (408 and 944 kilometers south of aũo nuevo, respectively) are intermediate to these two. pulse rate is homogeneous within each ... | 1969 | 5360593 |