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Accueil du site → Doctorat → Australie → < 1990 → Factors influencing movement patterns of the euro (Macropus robustus erubescens) in the arid zone

University of New South Wales (1989)

Factors influencing movement patterns of the euro (Macropus robustus erubescens) in the arid zone

Clancy, Timothy Francis

Titre : Factors influencing movement patterns of the euro (Macropus robustus erubescens) in the arid zone

Auteur : Clancy, Timothy Francis

Université de soutenance : University of New South Wales

Grade :Doctor of Philosophy (PhD) 1989

Résumé
Aspects of space-use patterns and social organisation of the euro (Macropus robustus erubescens) were studied over a three year period in arid N.S.W. Forty adults (21 males and 19 females) from two adjacent study sites were captured and fitted with radio-transmitters and their movements monitored. An additional 91 individuals of varying age/sex classes were marked to that details on individual associative behaviour could be gathered. Locations of radio-collared animals were recorded on a weekly basis and data were simultaneous collected on behaviour, habitat preference and on associations with conspecifics. Intensive diel monitoring of 15 to 20 animals from fixed radio-tracking stations was undertaken in six 2-week sessions. Various parameters describing this species’ home range were investigated (viz. size, location of core areas and activity centres, shifts in home-range position, rate of home-range use) and several intrinsic and extrinsic factors influencing movement patterns were identified. There were significant differences between the sexes in all parameters of home range measured due to their differing ecological and social requirements. Euros were essentially sedentary ; however, a long term basis some individuals were more dispersive. The different size/sex classes of euros exhibited differences in their associative and social spacing behavior and these patterns of social organisation varied over the period of the study. A range of reproductive and survival strategies were recorded in the different classes and these appear to be specific adaptations to the harsh and unpredictable nature of their arid environment. Population structures and densities and also vegetation changes in the two study sites were monitored on a three monthly basis. Survivorship of adult euros and reproductive output of females were both strongly related with the abundance of grass. Male and female euros differed in their fine grain selection of habitat. Females showed a much stronger preference for higher/steeper ground compared with males ; however, individuals of both sexes tended to move down the contour gradient as conditions deteriorated. Evidence is presented to support the hypothesis that the macropodid mode of locomotion leads to a more heterogeneous pattern of habitat use compared to eurtherian herbivores and that this is a factor in the comparatively lower level of sociality observed in macropods.

Subject words : Macropus robustus erubescens • Territoriality (Zoology) • Arid regions ecology

Présentation (National Library of Australia)

Accès au document : Proquest Dissertations & Theses

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