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Full-Text Articles in Social and Behavioral Sciences
An Evaluation Of Ferrihydrite- And Metsorb™-Dgt Techniques For Measuring Oxyanion Species (As, Se, V, P): Effective Capacity, Competition And Diffusion Coefficients, Helen L. Price, Peter R. Teasdale, Dianne F. Jolley
An Evaluation Of Ferrihydrite- And Metsorb™-Dgt Techniques For Measuring Oxyanion Species (As, Se, V, P): Effective Capacity, Competition And Diffusion Coefficients, Helen L. Price, Peter R. Teasdale, Dianne F. Jolley
Faculty of Science, Medicine and Health - Papers: part A
tThis study investigated several knowledge gaps with respect to the diffusive gradients in thin films(DGT) technique for measurement of oxyanions (As(III), As(V), Se(IV), Se(VI), PO43−, and V(V)) usingthe ferrihydrite and MetsorbTMbinding layers. Elution efficiencies for each binding layer were higherwith 1:20 dilutions, as analytical interferences for ICP-MS were minimised. Diffusion coefficients mea-sured by diffusion cell and by DGT time-series experiments were found to agree well and generallyagreed with previously reported values, although a range of diffusion coefficients have been reportedfor inorganic As and Se species. The relative binding affinity for both ferrihydrite and MetsorbTMwasPO43−≈ As(V) > V(V) ≈ As(III) > Se(IV) ≫ …
Bitou Bush Invasion Is Facilitated By Soil Chemistry Changes Which Inhibit The Growth Of Native Plants, Emilie-Jane Ens, Kris French, John B. Bremner
Bitou Bush Invasion Is Facilitated By Soil Chemistry Changes Which Inhibit The Growth Of Native Plants, Emilie-Jane Ens, Kris French, John B. Bremner
Faculty of Science, Medicine and Health - Papers: part A
Bitou bush is a weed of national significance and has been declared as a key threatening process in NSW. We aimed to strengthen the scientific understanding of the mechanisms of invasion by investigating potential allelopathy and indirect soil chemical effects. Our study compared whether extracts of bitou bush leaves, roots and soil had a different effect on the seedling growth of a range of native species compared to comparable extracts from an acacia, the native dominant in the non-invaded system. We found that bitou bush roots released significantly higher concentrations of sesquiterpenes into the soil, compared to the acacia. Corresponding …
How Much Do Kangaroos Of Differing Age And Size Eat Relative To Domestic Stock?: Implications For The Arid Rangelands, Terence Dawson, Adam Munn
How Much Do Kangaroos Of Differing Age And Size Eat Relative To Domestic Stock?: Implications For The Arid Rangelands, Terence Dawson, Adam Munn
Faculty of Science, Medicine and Health - Papers: part A
Over more than a century there has been debate about the interactions of kangaroos and introduced domestic stock, especially sheep, in the semi-arid and arid rangelands. The potential for competition between the species is still controversial, with pastoralists generally assuming that exploitative competition is a continuing feature of the rangelands, with competition by kangaroos leading to reduced stock production and carrying capacity. The current scientific consensus is that in the arid rangelands such competition is not common and occurs largely during dry periods when pasture is sparse. Competition is probably most persistent in more degraded environments. There is still debate …
Disturbance-Mediated Competition And The Spread Of Phragmites Australis In A Coastal Marsh, Todd Minchinton, Mark D. Bertness
Disturbance-Mediated Competition And The Spread Of Phragmites Australis In A Coastal Marsh, Todd Minchinton, Mark D. Bertness
Faculty of Science, Medicine and Health - Papers: part A
In recent decades the grass Phragmites australis has been aggressively invading coastal, tidal marshes of North America, and in many areas it is now considered a nuisance species. While P. australis has historically been restricted to the relatively benign upper border of brackish and salt marshes, it has been expanding seaward into more physiologically stressful regions. Here we test a leading hypothesis that the spread of P. australis is due to anthropogenic modification of coastal marshes. We did a field experiment along natural borders between stands of P. australis and the other dominant grasses and rushes (i.e., matrix vegetation) in …