Suchergebnisse

The length of the oestrous cycle of the bandicoot Isoodon macrourus was determined. Pouch young were
removed from lactating bandicoots at day 30 of lactation and the mothers were subsequently housed in
enclosures without males (for oestrous cycle) and with males (for pregnancy). Births were observed 32-48 d
after removal of young. The period of removal of young until ovulation was shown to be 6 d, the gestation
length was known to be 12.5 d and the length of an oestrous cycle was calculated to be 22.1 � 1.6 d
(mean � s.e., N=10), with a range of 14-30 d.

Regular brood surveys on a population of maned ducks, Chenonetta jubata, in south-eastern Australia
provided information on the timing of breeding, brood sizes, duckling survival and production for this
species. Over three years (1981-83), most breeding was during the spring, ducklings hatching between
late August and late November. Some autumn (March-May) breeding also occurred. Timing of breeding
appeared to be more closely related to the abundance of food than to rainfall alone. There were clear
differences in reproductive success between the drought year of 1982 and the two years of similar
weather, 1981 and 1983. Breeding began later in 1982, with a mean hatch date of 18 � 5.1 November,
compared with 7 � 3.6 October in 1981 and 21 � 5.1 September in 1983. Broods hatched over 43 days
in 1982 compared with 69 days in 1981 and 101 days in 1983. Also, duckling survival was lowest in
1982, with about a 20% probability of survival to fledging compared with 89% in 1981 and 82% in
1983. Only six broods were found in 1982 compared with 33 in 1981 and 30 in 1983. An estimated
158 and 176 ducklings survived to fledging compared with seven in 1982. Brood sizes at hatching did
not show the same clear annual differences. In 1981 and 1983 there were seasonal differences in brood
size at hatching. Broods were smaller late in the season (4.1) compared with early (7.2) and mid-season
(7.2). Broods were also larger in 1983 (7.2) than in 1981 (5.4). Brood size at hatching in 1982 was 6.0.

British colonial thinking was already well developed before the Stamp Act crisis of 1765-6 and this work traces the evolution of such thought from a period of relative neglect through a period of virtual renaissance in the 1750s to the formation of the North Ministry. Based upon both private and public opinion, the analysis concludes that the vision of Empire developed by 1770 was, in essence, the mercantile conceptualism which first encouraged the birth of Empire itself. Thus the work illustrates the strong degree of continuity in British colonial thinking, while at the same time, it provides a basis from which to interpret later British responses to the final crisis of Empire. Colonial theory did not exist in a political vacuum divorced from action, expediency or interest. The successive agencies which aided an awareness of colonial problems - the Board of Trade, the colonial expert, the Seven Years War, the Canada-Guadeloupe debate and the Stamp Act crisis are investigated in a series of interlinked chapters. The advocates of all interests constantly justified their relative positions through an appeal to history, precedent and preconception. This prevented any real progress in British attitudes towards Empire. Paradoxically, as British opinion became more concerned with the Empire its vision had little to do with colonial actualities. In short, even colonial expert opinion was illusory.

"31 January 1983." ; Shipping list no.: 89-469-P. ; "Supersedes TM 11-5820-401-34P-2-1, 1 March 1978"--P. i. ; Cover title. ; Mode of access: Internet. ; 14

Includes indexes. ; "2 May 1983." ; Shipping list no.: 91-027-P. ; "Supersedes TM 11-5820-401-34P-2-2, 17 May 1978"--P. i. ; Cover title. ; Mode of access: Internet. ; 14