Changes in species composition has major impacts on the persistence of ecological communities. These changes can occur as a result of natural fluctuations, ecological disturbances, and restoration efforts, and can lead to unstable interactions between naturally co-occurring species, and result in declines and possible local extinctions, especially if the change is the result of disturbance. One example is competition between naturally co-occurring taxa after the abundances of one or more of the species involved has changed (e.g., overabundance).

Aurelie’s project aims to quantify potential competition between two naturally co-occurring species, the common brushtail possum (Trichosurus vulpecula) and the bush rat (Rattus fuscipes) in Booderee National Park (BNP), using multiple experimental methods. There have been recent, rapid population expansions of T. vulpecula, following successful fox baiting. There have also been significant declines of R. fuscipes, with no clear cause.

About the Speaker

Aurelie Kanishka is a PhD candidate at the Australian National University, investigating potential competition between common brushtail possums and bush rats. Her background includes research into wasp oviposition, canine skull morphology, focusing on dingoes and domestic dogs, and research assistant work quantifying the online pet trade.