This paper describes the methods devised and used in rearing, transporting, sterilizing, and releasing Dacus tryoni for field experiments aimed at controlling natural populations of this pest with sterile males. The general principles of economical mass-rearing, including the management of breeding stocks, and quality and economy in larval rearing, and previous work on mass-rearing Dacus tryoni are discussed. Adults required exposure either to natural or artificial dusk to stimulate mating, 120 cages each stocked with 4000-5000 flies provided sufficient eggs to achieve a production rate of up to l0*6 pupae per week; eggs were collected in apple-hollows; larvae were reared in a medium whose basic components were yeast and dried powdered carrot; pupae were stored at 25�C and 70-80% R.H. until they were ready for irradiation; they were irradiated on the eighth day of pupal life using a 60Co source to produce doses between 6000 and 10,000 rads. After they had been irradiated the pupae were consigned by commercial aircraft to country airports near the points of release. The sites of release were trees; a release platform protected the pupae from rain, sun, and predators.
The life stages of Sisyra pedderensis are described and statistical data from laboratory rearing experiments discussed. Novel sampling methods were used to obtain pupae from the field since adults were not attracted to black lights and the larval life cycle closed in the laboratory. The diel cycles of egg eclosion, full-fed larval emergence from aquatic habitats, and adult emergence are examined and illustrated. Morphological data are provided to identify the three larval instars. A comprehensive comparison of the biology of S. pedderensis and closely related overseas species is made. In Lake Pedder, this species of spongillafly was proved to be bivoltine, with overwintering larvae becoming imagines in early summer which was followed by a single summer generation.
is the home of a number of relictual organisms. One of those, a new species of freshwater sponge of the genus Radiospongilla, is described herein. Radiospongilla pedderensis sp. nov. occurs throughout most of the lake and often is found in very large numbers in many bays. Radiospongilla is widely distributed in tropical and subtropical regions of all continents. The pneumatic layer of the gemmule contains numerous abnormal gemmoscleres a condition probably caused by the chemistry of the lake. The morphology and dimensions of the megascleres, gemmoscleres and aberrant gemmoscleres, as well as the location, structure and size of gemmules, are provided for R. pedderensis. The sponge is a bright green colour due to intracellular zoochlorellae. Their presence in local members of Radiospongilla has been the subject of considerable speculation but herein they are illustrated for the first time in an Australian species.
The genus Loamaggalangta gen. nov. is established to accommodate a species of leptophlebiid mayfly from Tasmania. Adults and nymphs of Loamaggalangta pedderensis sp. nov. are described and figured. Nymphs have only been collected from greater than 5 m below the surface in the impounded Lake Pedder. Nymphs of additional species from mainland south‐eastern and south‐western Australia probably also belong in the genus, but formal descriptions must await associations with adults.
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