Pygmy Possum Project

Sufficient Rainfall

I modified (in red) the map below from figure 22 page 18 of Leeper, G.W., CSIRO The Australian Environment (Fourth Edition), 1970. Shows the length of the growing period in months during which rainfall was calculated as effective. The red zone within the 5-9 period in Queensland represents climates where the five months of effective rainfall are not consecutive and therefore ineffective. This zone has moved south to NSW with the weather system that brings reliable cooler season rain.


This map from the Wikipedia article on Banksias shows the distribution of Banksias in Australia. Note that Banksias grow only in the zones of effective rainfall where there are consecutive months of effective rainfall forming a growing season (i.e. low enough monthly variability). Of concern for Ku-ring-gai Banksias is the movement south into NSW of the zone without Banksias shown in central and southern Queensland initially leaving only a very coastal fringe where rainfall bearing clouds just graze the very coastal areas (such as Northern Beaches) and later very little in the way of Banksia-containing habitat. As a long term regular bushwalker I have noticed the gradual thinning out of Banksias from areas where they were thick so anecdotally it appears that change in underway. This is confirmed by my recent documentation of Banksia Death (see menu link of that title).

The following series of distribution maps from the Atlas of Living Australia (ALA) shows the close association of nectar-feeding non-airborne marsupials and Banksias in their distribution. This makes it unlikely that these fauna can survive without Banksias being present in their habitat.

Pygmy Possums (Cercartetus spp.):

Honey Possum:

Northern Glider:

So, you can see from the above 3 distribution maps that these 3 marsupial fauna distributions cover the range of Banksias in Australia.