. Wildlife and range research needs in northern Mexico and southwestern United States : workshop proceedings, April 20-24, 1981, Rio Rico, Arizona. Wildlife management Southwestern States Congresses; Wildlife management Mexico Congresses. NORTH AND SOUTH AREA: MINIMAL CONDITIONS North: Tecomate Jamoncillo Pozo Cayetano South: Las Cruces El Sausal DISCUSSION AND RECOMMENDATIONS the next year, with a density of ; three years later (1974) it decreased to This self- control phenomenon was very drastic and almost endangered the population. The evidence of
. Wildlife and range research needs in northern Mexico and southwestern United States : workshop proceedings, April 20-24, 1981, Rio Rico, Arizona. Wildlife management Southwestern States Congresses; Wildlife management Mexico Congresses. NORTH AND SOUTH AREA: MINIMAL CONDITIONS North: Tecomate Jamoncillo Pozo Cayetano South: Las Cruces El Sausal DISCUSSION AND RECOMMENDATIONS the next year, with a density of ; three years later (1974) it decreased to This self- control phenomenon was very drastic and almost endangered the population. The evidence of this phenomenon is very strong. In the years following 1974, biologists collected many antlered skulls, and they found many animal skeletons. Another extrinsic factor which contributed to the decrease in population was illegal hunting. Tiburon Island is a limited ecosystem that allows a satisfactory study of the biology and ecology of wild animals because the observation of the development of its populations can be controlled. Ecology of mule deer has been studied very extensively, and its population dynamics has been observed for a decade. The curve of population growth during 10 years shows critical variation in the rate of population change. The highest population registered was in 1971, with a density of , and a peak of 1,631 animals. During this period, the biotic potential created an overpopu- lation and the supporting capacity of the habitat was exceeded. Then environmental resistance (famine, competition) acted drastically, affecting reproduction and individual survival in such a way that the population decreased considerably. Average conditions ~rrf> id Minimal condi-t'ions 3• Currently the population is recovering with a density of , close to the density recorded in 1970 () when the first study was conducted. During the last two years we have established a vigilance plan around the island in order to protect the wildlife by avoiding the huma
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