Abstract
Densities of populations of Microtus californicus inhabiting North Coastal perennial grasslands were found to be consistently less than 60 per acre over a 5-year period. There is no evidence of multiyear cyclicity in the fluctuations of this population. Another unusual feature of the population is the extremely low level of recruitment. Adults in this habitat appear to weigh more than similar animals in cycling populations in annual grasslands. Smaller litter sizes in perennial grasslands and perhaps higher juvenile mortality are thought to contribute to the low recruitment rates and the absence of cycling.
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