摘要:

SummaryThe habitat ofLalage sueurii tricolorin north-western Australia is described and, after some notes about locomotion and comfort movements, details on food and feeding habits are given. The food consists mainly of large insects (especially grasshoppers and caterpillars) which are captured on the ground. The male song primarily serves to advertise the territory and is given usually while on the wing. The species breeds during the summer rains. Its breeding season is considerably longer than in other insect eaters, which may be connected with the wide variety of food taken. Within the prolonged breeding season of the species individual breeding and moulting cycles may vary considerably and males in nuptial and eclipse plumage may be found at the same time. In coastal areas Trillers vigorously defend a fairly large territory. In the interior of the continent, there is a trend towards colony breeding, the biological significance of which is discussed. Nesting site and nest are described. Both sexes participate in nest-construction, the male doing 60–70 per cent of the work. Incubation starts the day the second egg is laid. Male and female incubate alternately, with the average period on being 10–15 minutes. All clutches found consisted of 2 eggs. Incubation takes 14 days. The young are fed and covered by both parents until the eighth day after hatching, when the male suddenly ceases to participate in the care of the young. The fledging period is 12 days. Near permanent water the breeding pairs tend to keep their territories all the year round. In drier regions they may be forced to leave their breeding grounds owing to lack of food and water. Some obvious discrepancies between sexual dimorphism and participation in parental care are discussed.

ISSN:0158-4197    

DOI:10.1071/MU966001

出版商:Taylor&Francis    

年代:1966

数据来源: Taylor

ISSN:0158-4197    

DOI:10.1071/MU966016a

出版商:Taylor&Francis    

年代:1966

数据来源: Taylor

摘要:

SummaryThe relation of habitat and food preferences to relative size of the nasal salt glands and adrenal glands in 5 Australian cormorant species has been investigated. The diet of the Little Pied Cormorant in particular differs in the marine/estuarine and fresh-water habitats. The mean relative nasal gland size of both Black and Little Pied Cormorants is significantly different in these contrasting habitats, while other species show apparently consistent trends. Within species there is no significant correlation of relative adrenal size with relative nasal salt gland size. Implications of the data in relation to population movement and the hormonal regulation of extrarenal excretion are discussed.

ISSN:0158-4197    

DOI:10.1071/MU966017

出版商:Taylor&Francis    

年代:1966

数据来源: Taylor

ISSN:0158-4197    

DOI:10.1071/MU966026a

出版商:Taylor&Francis    

年代:1966

数据来源: Taylor

ISSN:0158-4197    

DOI:10.1071/MU966026c

出版商:Taylor&Francis    

年代:1966

数据来源: Taylor

ISSN:0158-4197    

DOI:10.1071/MU966028

出版商:Taylor&Francis    

年代:1966

数据来源: Taylor

ISSN:0158-4197    

DOI:10.1071/MU966029

出版商:Taylor&Francis    

年代:1966

数据来源: Taylor

ISSN:0158-4197    

DOI:10.1071/MU966032

出版商:Taylor&Francis    

年代:1966

数据来源: Taylor

ISSN:0158-4197    

DOI:10.1071/MU966033

出版商:Taylor&Francis    

年代:1966

数据来源: Taylor

ISSN:0158-4197    

DOI:10.1071/MU966038

出版商:Taylor&Francis    

年代:1966

数据来源: Taylor