Integrating research and management for an urban estuarine system: the Swan-Canning Estuary, Western Australia

2001 ◽  
Vol 15 (13) ◽  
pp. 2383-2385 ◽  
Author(s):  
David P. Hamilton ◽  
Jeffrey V. Turner
Keyword(s):  
Western Australia ◽  
Estuarine System

Phosphorus export from coastal plain drainage into the Peel-Harvey estuarine system of Western Australia

1982 ◽  
Vol 33 (1) ◽  
pp. 23 ◽  
Author(s):  
PB Birch
Keyword(s):  
Western Australia ◽  
Coastal Plain ◽  
Dairy Farms ◽  
Dairy Farming ◽  
Benthic Alga ◽  
Clay Soils ◽  
Estuarine System ◽  
Phosphorus Export ◽  
Alluvial Clay

Excessive growth of the benthic alga Cladophora aff. albida in the Peel-Harvey estuarine system has coincided with greatly increased inputs of phosphorus from rivers over the last 20-25 years. At present, about 90%, of phosphorus input is derived from rural coastal plain catchments, where use of superphosphate increased fourfold over the period 1945-1975. The present export of phosphorus from these catchments was found to be positively correlated with rates of superphosphate application, dairy farming, and presence of alluvial clay soils, and negatively correlated with beef farming. Reduction of phosphorus input to the estuary from the coastal plain, therefore, could be achieved by reducing or modifying the present use of superphosphate, and reducing runoff from dairy farms into waterways.

Eutrophication in the Peel-Harvey Estuarine System, Western Australia

1981 ◽  
pp. 323-342 ◽  
Author(s):  
A. J. McComb ◽  
R. P. Atkins ◽  
P. B. Birch ◽  
D. M. Gordon ◽  
R. J. Lukatelich
Keyword(s):  
Western Australia ◽  
Estuarine System

Persistence of giants: population dynamics of the limpet Scutellastra laticostata on rocky shores in Western Australia

2020 ◽  
Vol 646 ◽  
pp. 79-92
Author(s):  
RE Scheibling ◽  
R Black
Keyword(s):  
Population Dynamics ◽  
Western Australia ◽  
Size Structure ◽  
Survival Rates ◽  
Maximum Size ◽  
High Rate ◽  
Adult Survival ◽  
Rocky Shores ◽  
Adult Size ◽  
Decadal Time Scale

Population dynamics and life history traits of the ‘giant’ limpet Scutellastra laticostata on intertidal limestone platforms at Rottnest Island, Western Australia, were recorded by interannual (January/February) monitoring of limpet density and size structure, and relocation of marked individuals, at 3 locations over periods of 13-16 yr between 1993 and 2020. Limpet densities ranged from 4 to 9 ind. m-2 on wave-swept seaward margins of platforms at 2 locations and on a rocky notch at the landward margin of the platform at a third. Juvenile recruits (25-55 mm shell length) were present each year, usually at low densities (<1 m-2), but localized pulses of recruitment occurred in some years. Annual survival rates of marked limpets varied among sites and cohorts, ranging from 0.42 yr-1 at the notch to 0.79 and 0.87 yr-1 on the platforms. A mass mortality of limpets on the platforms occurred in 2003, likely mediated by thermal stress during daytime low tides, coincident with high air temperatures and calm seas. Juveniles grew rapidly to adult size within 2 yr. Asymptotic size (L∞, von Bertalanffy growth model) ranged from 89 to 97 mm, and maximum size from 100 to 113 mm, on platforms. Growth rate and maximum size were lower on the notch. Our empirical observations and simulation models suggest that these populations are relatively stable on a decadal time scale. The frequency and magnitude of recruitment pulses and high rate of adult survival provide considerable inertia, enabling persistence of these populations in the face of sporadic climatic extremes.

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