
%0 Journal Article
%A Martin, RW 
%T Age-Specific Fertility in Three Populations of the Koala,  Phascolarctos cinereus Goldfuss, in Victoria
%J Wildlife Research
%D 1981/06/01
%V 8
%N 2
%P 275-283
%K 
%R https://doi.org/10.1071/WR9810275
%U https://www.publish.csiro.au/paper/WR9810275 
%X Mean fertility in three koala populations in Victoria in 1979 varied from 63% on French I, to 13% at Walkerville and 22% on Phillip I. Similar differences between the two island populations have existed for at least 30 y. A method of assigning animals to age classes on the basis of the wear patterns on the premolar was devised and reproduction in 1979 examined on an age-specific basis. The low fertility was associated with a reproductive failure among females older than 3 y. On Phillip I. this is thought to be due to a widespread reproductive tract disease in females, possibly caused by ingestion of phytooestrogens from eucalypt foliage. At Walkerville a combination of reproductive tract disease, poor nutrition and heavy tick burdens is thought to be the cause. 
