field energetics and the estimation of pollen and nectar intake in the marsupial honey possum, tarsipes rostratus, in heathland habitats of south-western australia. | a method is described, based on the simultaneous turnover of both stable (18o) and radioactive isotopes (3h and 22na), whereby the daily nectar and pollen intake of free-ranging marsupial honey possums (tarsipes rostratus) may be estimated. the field metabolic rate is measured using doubly labelled water and nectar intake is estimated independently from the measured water and sodium fluxes. the method assumes that free-water intake is negligible (but may be accounted for if not the case), that v ... | 1999 | 10633562 |