Abstract
The shrew‐sized marsupial Tarsipes rostratus, endemic to south‐western Australia, eats only nectar and pollen. Tarsipes were caught at four sites, each with 100 pitfall traps, during 21 threeday periods over three years. On these occasions, the numbers of adult females, all adults and all Tarsipes caught were each significantly related to the estimated nectar production of the plants most frequently visited by Tarsipes. Sites with higher levels of nectar production had higher capture rates in each of the three years. Changes in the population density of the short‐lived ( 1 year) Tarsipes appeared directly related to changes in nectar levels through differential survival, rather than by migration or fecundity.
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