scholarly journals Developing Field Cage Tests to Measure Mating Competitiveness of Sterile Light Brown Apple Moths (Lepidoptera: Tortricidae) in Western Australia

2016 ◽  
Vol 99 (sp1) ◽  
pp. 138-145 ◽  
Author(s):  
Bill Woods ◽  
Donald McInnis ◽  
Ernie Steiner ◽  
Alven Soopaya ◽  
Jeremy Lindsey ◽  
...  
Keyword(s):  
Western Australia ◽  
Field Cage ◽  
Mating Competitiveness

The Sterile Insect Release Method and the Importance of Thermal Conditioning Before Release - Field-Cage Experiments With Dacus-Tryoni in Spring Weather

1987 ◽  
Vol 35 (2) ◽  
pp. 197 ◽  
Author(s):  
HAC Fay ◽  
A Meats
Keyword(s):  
Target Population ◽  
Cold Weather ◽  
Large Field ◽  
Field Cage ◽  
Mating Competitiveness ◽  
Rate Of Increase ◽  
Conditioned State ◽  
Males And Females ◽  
Sterile Insect Release ◽  
Release Method

We present a rationale for the strategy of suppressing the fertility and hence the rate of increase of target populations in spring by the release of sterile insects. Insects for mass release are normally reared in warm conditions and are potentially unsuitable for use in cold weather. A comparison was made of the effectiveness of warm- and cold-conditioned sterile flies in experiments in large field-cages during three successive spring seasons. Sterile males and females, and wild males and females were released into the cages in the ratio 2:2:1:1, respectively. Warm-conditioned sterile flies survived poorly between release and mating. Their mating competitiveness was inferior to that of the wild flies, and they were relatively ineffective in reducing their fertility. Sterile flies released in a cold-conditioned state (equal to that of the wild flies), survived as well as wild flies, and suppressed their fertility to an extent which indicates that their mating competitiveness can be equal to that of the wild flies, if the weather is not too severe. The concept of total competitiveness is introduced. If competitiveness is calculated by means of the ratio of sterile to wild flies that exists at release (rather than at mating), the resulting value is a measure of the potential of the sterile flies to survive to mating age, and to mate in competition with the wild flies. This value is especially pertinent to situations such as a puparial release, when there is a delay between release and mating. In such circumstances, it is needed for calculating the required ratio of sterile to wild insects to achieve the desired reduction of fertility (and thus rate of increase) in the target population.

Mating Competitiveness of Culex tarsalis1 Double Translocation Heterozygote Males in Laboratory and Field Cage Trials3

1977 ◽  
Vol 70 (6) ◽  
pp. 849-854 ◽  
Author(s):  
H. A. Terwedow ◽  
S. M. Asman ◽  
P. T. McDonald ◽  
R. L. Nelson ◽  
W. C. Reeves
Keyword(s):  
Field Cage ◽  
Translocation Heterozygote ◽  
Mating Competitiveness

Codling Moth: Field-Cage Mating Competitiveness of Radiosterilized Males123

1977 ◽  
Vol 70 (1) ◽  
pp. 64-65 ◽  
Author(s):  
L. D. White ◽  
M. Koslinska ◽  
Z. W. Suski
Keyword(s):  
Codling Moth ◽  
Field Cage ◽  
Mating Competitiveness

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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