Abstract
1. Spiny rat Proechimys semispinosus populations on eight small islands in Gatun Lake (central Panama) were censused monthly for 1 year by live-trapping to examine seasonal patterns of demography in a fragmented landscape. 2. The annual fluctuation in density, breeding activity, age structure, and sex ratio from all populations combined was similar to populations studied previously in central Panama. Densities were lowest at the beginning of the rainy season and peaked in the late rainy season. Breeding occurred all year, but the number of births was greatest in April. The proportion of adults peaked in mid-dry season and was lowest in mid-rainy season. 3. Each separate population also showed distinct fluctuations, but the timing of peaks and lows varied among populations
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