Ecology of burrowing bettongs, Bettongia lesueur (Marsupialia: Potoroidae), on Dorre and Bernier Islands, Western Australia

摘要: Population structure, reproduction, condition, morphology, movements, habitat preference, and dynamics of the burrowing bettong were assessed on Dorre Bernier Islands between 1988 1995. The data come from 982 captures bettongs in 2661 trap-nights (an average 37 per 100 trap-nights). Recaptures within a trip made up 39% captures. Bettongs more abundant, as indexed by trap success, than western barred bandicoots (the other species caught considerable numbers trapping grids). Sex ratio (excluding recaptures) skewed heavily towards males at 1.43: 1 despite approximate parity pouch young. Production young was concentrated wetter winter months appeared to fall well below their theoretical capacity 3 year. Bettong females capable producing 880–900 g (approximately 7–8 age) but incidence with or showing signs recent lactation increased 40% for 881–1000 62% > 1000 g. sub-adult population peaked spring, varied years (range 0–14% population). There an excess over population. showed little sexual dimorphism there significant differences morphology two island populations. suffer substantial reductions prolonged drought extending October 1986 April 1989, reducing success this 19% 1989 survey. Numbers grew strongly both islands after breaking May observed rate increase r = 0.75 Island. Trap had 45% September 1991. high turnover grids – 25–40% 6 80% years. Movements limited: median distance moved captured once 8-day session 160 m. Only 4% recorded movements greater km. no difference sexes. widely dispersed through four habitats surveyed tended concentrate dune Triodia sandplain autumn spring.