Stock-Recruitment-Environment Relationship in a Portunus pelagicus Fishery in Western Australia

2011 ◽  
Author(s):  
S. de Lestang ◽  
L.M. Bellchambers ◽  
N. Caputi ◽  
A.W. Thomson ◽  
M.B. Pember ◽  
...  
Keyword(s):  
Western Australia ◽  
Portunus Pelagicus ◽  
Stock Recruitment

Stock-recruitment-environment relationships of invertebrate resources in Western Australia and their link to pro-active management harvest strategies

Marine Policy ◽  
2021 ◽  
Vol 133 ◽  
pp. 104728
Author(s):  
Nick Caputi ◽  
Arani Chandrapavan ◽  
Mervi Kangas ◽  
Simon de Lestang ◽  
Anthony Hart ◽  
...  
Keyword(s):  
Western Australia ◽  
Active Management ◽  
Stock Recruitment

Cadmium and other heavy metal concentrations in selected biota from Cockburn Sound, Western Australia

1982 ◽  
Vol 33 (5) ◽  
pp. 779 ◽  
Author(s):  
V Talbot ◽  
A Chegwidden
Keyword(s):  
Heavy Metal ◽  
Western Australia ◽  
Carapace Width ◽  
Industrial Effluent ◽  
Correlation Coefficients ◽  
Female Crab ◽  
Portunus Pelagicus ◽  
Heavy Metal Concentrations ◽  
Chaetopterus Variopedatus ◽  
Metal Levels

Concentrations of some heavy metals in Mytilus edulis (Cd, Cr, Cu, Fe, Mn, Pb and Zn), Ostrea angasi (Cd, Cr, Cu, Pb and Zn). Portunus pelagicus (Cd, Cu, Pb and Zn), Chaetopterus variopedatus (Cd, Cu and Zn), Posidonia spp. and their epiphytes (Cd, Cu, Fe and Zn), and Ulva lactuca (Cd, Cu, Fe. Mn, Pb and Zn) from Cockburn Sound, Western Australia, are reported. The highest concentrations of Cd; Cr and Pb in M. edulis and Cd and Zn in O. angasi were found in those animals taken from the vicinity of industrial effluent discharge points. Further, elevated concentrations of some metals were noted in the hepatopan- creas of Portunus pelagicus and in C. variopedatus and U. lactuca. Significant correlation coefficients for Cd-Cu, Cd-Fe, Cd-Zn, Cu-Fe, Cu-Zn and Fe-Zn in M. edulis indicated that elevated heavy metal levels resulted from industrial effluent discharges. Significant correlation coefficients for Cd-Zn and Cd-carapace width were found in the female crab P.pelagicus only. C. variopedatus and U. lactuca, unlike Posidonia spp. and their epiphytes, showed potential as trace metal indicators.

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.

Antipodean Aftershocks: Group Settlement of Hebridean and non-Hebridean Britons in Western Australia following World War One

2020 ◽  
Vol 11 (2) ◽  
pp. 188-203
Author(s):  
Roy Jones ◽  
Tod Jones
Keyword(s):  
New Zealand ◽  
British Empire ◽  
Western Australia ◽  
The Sun ◽  
World War ◽  
World War One ◽  
A Site

In the speech in which the phrase ‘land fit for heroes’ was coined, Lloyd George proclaimed ‘(l)et us make victory the motive power to link the old land up in such measure that it will be nearer the sunshine than ever before … it will lift those who have been living in the dark places to a plateau where they will get the rays of the sun’. This speech conflated the issues of the ‘debt of honour’ and the provision of land to those who had served. These ideals had ramifications throughout the British Empire. Here we proffer two Antipodean examples: the national Soldier Settlement Scheme in New Zealand and the Imperial Group Settlement of British migrants in Western Australia and, specifically, the fate and the legacy of a Group of Gaelic speaking Outer Hebrideans who relocated to a site which is now in the outer fringes of metropolitan Perth.

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