| Autor: |
BISHOP, A. L., McKENZIE, H. J., BARCHIA, I. M., MURISON, R., SPOHR, L. J. |
| Zdroj: |
Australian Journal of Entomology; August 1996, Vol. 35 Issue: 3 p209-212, 4p |
| Abstrakt: |
A study was made of the positions of juvenile stages of Culicoides brevitarsisand of four other species of flies (Diptera) breeding in bovine dung. The objective was to provide information on sampling cores of dung for laboratory experiments and to study fly behaviour associated with the breeding habitat. Oviposition and field exposure of dung were restricted to 2 d and this enabled relatively discrete populations of flies to be investigated. All species were reasonably abundant after 2 d of oviposition. Distributions were contrasted by dividing the dung into vertical and horizontal segments. C. brevitarsis, A ustralosepsis niveipennisand Leptocera mirabilisoviposited mainly in the top of the dung, while Sepsis nitensand Psychodasp. oviposited mainly in the lower half. After hatching, the proportions of flies varied between positions and over time. Except for C. brevitarsis, the adult flies were reared from the half of the pat associated with oviposition. C. brevitarsisand A. niveipennisrearings were evenly distributed in centre and outer positions 4 d after dung deposition and C. brevitarsisshowed clear changes in vertical position over time. Moisture content in the dung decreased by 16.1% after 10 d, mainly in the upper half of the pat. Greater numbers of C. brevitarsiswere associated with areas of higher moisture. The fly species varied in their times of emergence with C. brevitarsisemerging later in the lower half positions than in the upper half positions 10 d after deposition of the dung. A procedure for sampling cores of dung is proposed. |
| Databáze: |
Supplemental Index |
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