Behavioral and demographic parameters were studied in Microtus longicaudus and M. mexicanus during 1969 and 1970. Microtus longicaudus was at peak density (120/ha) in 1969 and decline density (30/ha) in 1970. Microtus mexicanus remained at low density (30/ha) during both years. Sex ratios, and survival rates were different between years in M. longicaudus, not different in M. mexicanus. Intraspecific agonistic behavior in M. longicaudus was consistent with hypotheses of intrinsic regulation. Behavioral reactions related to contention for space were measured. These values support an hypothesis relating space to interspecific competition in these species.
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Walt Conley (1976) studied this question.
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