Detecting marine pests using eDNA and Biophysical models.

Mr Morgan Ellis¹

¹Deakin University, Queenscliff, Aus

Abstract:

Invasive species are one of the leading causes of biodiversity loss globally. Being able to locate invasive species in a timely and cost-effective manner is essential to managing their spread. Environmental DNA (eDNA) is an emerging technology that is providing an effective, low-cost tool as an alternative to higher cost, traditional surveys. eDNA decays at varying rates depending on the target species, together with numerous other physico-chemical variables. This can affect the likelihood of detection and the distance eDNA may travel in the environment. Knowledge of the eDNA decay rate can be combined with biophysical modelling to help identify the likely source of eDNA release. The aim of this study was to determine the eDNA decay rates of two invasive species in south-eastern Australia: wakame (Undaria pinnatifida) and the Northern Pacific seastar (Asterias amurensis). The laboratory decay rate assays were then added to biophysical models to determine the distance eDNA may travel after release and still be detected in the environment. Finally, eDNA samples were taken at various ports, harbours, and Marine Protected Areas along the Victorian Coastline to determine the contemporary distribution of these two highly invasive species.

Biography:

Morgan is a PhD Candidate with EcoGenetics lab at Deakin University’s Marine Science Centre in Queenscliff. Morgan’s PhD uses Molecular tools and behavioral studies to better understand invasive species ecology with a focus on the Northern Pacific Seastar. This includes metabarcoding to understand diets, behavioural studies of key prey species, and the use of eDNA to detect invasive pests.