2012 International Symposium on Geomatics for Integrated Water Resource Management, 2012
ABSTRACT The ecological viability of mudflat habitats in the Coorong, South Australia, was assess... more ABSTRACT The ecological viability of mudflat habitats in the Coorong, South Australia, was assessed through modeling spatio-temporal patterns of inundation across three long-term (114 year) flow scenarios. High resolution Digital Elevation Models were used with water level and salinity outputs from a hydrodynamic model of the Coorong to predict temporal frequency of inundation, inundation area through time and under a salinity threshold. Results show greatly reduced habitat availability under a no action scenario and marginally improved availability under the proposed 2800 GL/year scenario, relative to natural pre-European conditions.
... calculated as a percentage outside the sum (Fig. 4). The Plant nomenclature fol-lowsCurtis (1... more ... calculated as a percentage outside the sum (Fig. 4). The Plant nomenclature fol-lowsCurtis (1963, 1967), Curtis and Morris (1975), Willis (1970), and Wakefield (1975). The relative diagram (Fig. 4) can be divided into three pollen ...
This work contributes to the optimization of a macroalgal bioassay to map nutrient plumes in coas... more This work contributes to the optimization of a macroalgal bioassay to map nutrient plumes in coastal waters based on δ 15 N signatures in tissues. Species with low nitrogen content and high rates of uptake showed faster incorporation of the isotopic signature of dissolved ...
The definition of the spatial footprint of land-derived nutrient plumes is a key element to the d... more The definition of the spatial footprint of land-derived nutrient plumes is a key element to the design of initiatives to combat eutrophication in urbanised coastal regions. These plumes, however, are difficult to monitor because of their inherent high-frequency temporal and spatial variability. Biomonitoring with macroalgae provides time-integration of bioavailable nitrogen inputs through the measurement of δ¹⁵N signatures in tissues, and adequate spatial coverage through translocation to desirable monitoring locations. In this study, we used laboratory incubations to compare three different species of macroalgae as bioindicators, and a field experiment to investigate the applicability of the technique for the large-scale mapping of nutrient plumes. Cladophora valonioides was selected for the field experiment as it showed rapid changes in δ¹⁵N values in the laboratory incubations, was abundant in shallow depths making collection cost-efficient, and had tough thalli capable of withstanding deployment in open water. Ecklonia radiata also performed well in the laboratory incubations, but field harvest from subtidal depths was comparatively more expensive. Ulva lactuca had fragile thalli, and large nitrogen reserves that acted to mask the isotopic signal of newly acquired nitrogen. Cladophora valonioides was translocated to 246 sites covering an area of ∼445 km² along the highly urbanized temperate coast of Adelaide, South Australia. The resulting isotopic signatures of nitrogen in tissues were spatially interpolated to produce maps of land-derived nutrient plumes, to model probability and standard error in the predictive surface, and to optimize sampling design.
2012 International Symposium on Geomatics for Integrated Water Resource Management, 2012
ABSTRACT The ecological viability of mudflat habitats in the Coorong, South Australia, was assess... more ABSTRACT The ecological viability of mudflat habitats in the Coorong, South Australia, was assessed through modeling spatio-temporal patterns of inundation across three long-term (114 year) flow scenarios. High resolution Digital Elevation Models were used with water level and salinity outputs from a hydrodynamic model of the Coorong to predict temporal frequency of inundation, inundation area through time and under a salinity threshold. Results show greatly reduced habitat availability under a no action scenario and marginally improved availability under the proposed 2800 GL/year scenario, relative to natural pre-European conditions.
... calculated as a percentage outside the sum (Fig. 4). The Plant nomenclature fol-lowsCurtis (1... more ... calculated as a percentage outside the sum (Fig. 4). The Plant nomenclature fol-lowsCurtis (1963, 1967), Curtis and Morris (1975), Willis (1970), and Wakefield (1975). The relative diagram (Fig. 4) can be divided into three pollen ...
This work contributes to the optimization of a macroalgal bioassay to map nutrient plumes in coas... more This work contributes to the optimization of a macroalgal bioassay to map nutrient plumes in coastal waters based on δ 15 N signatures in tissues. Species with low nitrogen content and high rates of uptake showed faster incorporation of the isotopic signature of dissolved ...
The definition of the spatial footprint of land-derived nutrient plumes is a key element to the d... more The definition of the spatial footprint of land-derived nutrient plumes is a key element to the design of initiatives to combat eutrophication in urbanised coastal regions. These plumes, however, are difficult to monitor because of their inherent high-frequency temporal and spatial variability. Biomonitoring with macroalgae provides time-integration of bioavailable nitrogen inputs through the measurement of δ¹⁵N signatures in tissues, and adequate spatial coverage through translocation to desirable monitoring locations. In this study, we used laboratory incubations to compare three different species of macroalgae as bioindicators, and a field experiment to investigate the applicability of the technique for the large-scale mapping of nutrient plumes. Cladophora valonioides was selected for the field experiment as it showed rapid changes in δ¹⁵N values in the laboratory incubations, was abundant in shallow depths making collection cost-efficient, and had tough thalli capable of withstanding deployment in open water. Ecklonia radiata also performed well in the laboratory incubations, but field harvest from subtidal depths was comparatively more expensive. Ulva lactuca had fragile thalli, and large nitrogen reserves that acted to mask the isotopic signal of newly acquired nitrogen. Cladophora valonioides was translocated to 246 sites covering an area of ∼445 km² along the highly urbanized temperate coast of Adelaide, South Australia. The resulting isotopic signatures of nitrogen in tissues were spatially interpolated to produce maps of land-derived nutrient plumes, to model probability and standard error in the predictive surface, and to optimize sampling design.
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