Enhancing nutrient retention in soils through management of microbial biomass. Soil microbial-processes are generally studied in relation to mineralisation of nutrients but rarely for their potential to retain nutrients and reduce nutrient leaching. We hypothesise that management of microbial immobilisation will enhance nutrient retention in nutrient enriched soils during seasonal rains. This hypothesis will be tested under strongly seasonal environments of southwest Australia where nutrient lea ....Enhancing nutrient retention in soils through management of microbial biomass. Soil microbial-processes are generally studied in relation to mineralisation of nutrients but rarely for their potential to retain nutrients and reduce nutrient leaching. We hypothesise that management of microbial immobilisation will enhance nutrient retention in nutrient enriched soils during seasonal rains. This hypothesis will be tested under strongly seasonal environments of southwest Australia where nutrient leaching from soils degrades quality of surface and groundwater. We will first investigate pathways and conditions leading to microbial immobilisation. We will then explore the regulation of substrate and nutrient conditions to promote such retention, and subsequently develop management interventions based on microbially-mediated nutrient retention.Read moreRead less
Ecological responses of native fishes to dynamic water flows in northwest arid Australia. This project will investigate the biological adaptations and ecology of native fishes of northwest Australia in order to assess their resilience to altered water flows due to mining activities and changing climate. The project findings will contribute to sustainable management of water and biodiversity in arid environments.
Detecting ecological impacts of water extraction on river ecosystem structure and function: Validating a novel decision-making protocol. Reliable assessment of ecological responses to flow alteration coupled with management triggers to prevent unacceptable impact is essential in rivers where water extraction occurs. Most regulated rivers lack optimal monitoring programs to provide early indications of over-extraction. We aim to apply a novel framework (Downes et al. 2002) to optimize sampling ....Detecting ecological impacts of water extraction on river ecosystem structure and function: Validating a novel decision-making protocol. Reliable assessment of ecological responses to flow alteration coupled with management triggers to prevent unacceptable impact is essential in rivers where water extraction occurs. Most regulated rivers lack optimal monitoring programs to provide early indications of over-extraction. We aim to apply a novel framework (Downes et al. 2002) to optimize sampling efficiency of structural and functional variables to determine whether extractions from the Nymboida River, NSW, are preventing the system from achieving its desired ?target?. If validated, this innovative framework that specifies effect size, statistical power, and management triggers will be invaluable for common situations where pre-impact data are lacking.Read moreRead less
Bad tastes, odours and toxins in our drinking water reservoirs: are benthic cyanobacteria the culprits? Cyanobacteria (blue-green algae) produce toxins and bad tastes that contaminate drinking water sources, cause public concern about water quality. This project will address a critical knowledge gap by investigating species that grow on the sediments of reservoirs, thus providing more comprehensive management solutions to the water industry.