Poster Presentation Australian Society for Limnology Conference 2017

Effects of Simulated Browsing on Brisbane Riparian Seedlings (#103)

Amanda M McArthur 1 , Amy George 1 , Fran Sheldon 1
  1. Griffith University, Mount Gravatt, QLD, Australia

Ecological restoration aims to assist in the recovery of an ecosystem that has been disturbed by human activity or natural disaster. Cattle are a serious threat to restoration efforts, shown to stunt seedling growth and reduce survival, preventing restoration from reaching success. Riparian areas h at higher risk, as fencing around riparian sites is often incomplete on the water-facing side, leaving that point open to browsers. Additionally, the maintenance and monitoring of restoration sites is often underfunded, leading fencing, particularly on leased land, to fall into ill-repair. Along the Brisbane River, many restoration sites are on land used for pasture, making cattle an immediate hazard. In the past, studies on the effects of cattle browsing have focused on North American species and their responses when grown in the field. In this study we examine the effects of simulated browsing on seedlings of three tree species, Melaleuca viminalis, Casuarina cunninghamiana, and Eucalyptus tereticornis. These species have been used in recent Brisbane riparian restoration projects are native to the Brisbane area. The seedlings will be grown in controlled conditions, with browsing simulated by 'pulling' photosynthetic material. There will be six levels of browsing intensity: 0%, 15%, 30%, 60%, 90%, and 100%. We aim to present the impacts of these simulated browsing regimes on absolute and relative above- and below-ground biomass, as well as observed morphological differences in species responses. Our results may be of use to inform future restoration projects about the relative resilience of the selected species to browsing damage.