Title page for ETD etd-11212005-142925


Document Type Master's Dissertation
Author Elwen, Simon Harvey
URN etd-11212005-142925
Document Title Environmental factors influencing the distribution of southern right whales (Eubalaena australis) on the South African coast
Degree MSc (Zoology)
Department Zoology and Entomology
Supervisor
Advisor Name Title
Dr P B Best
Keywords
  • southern white whale environmental geography
  • southern right whale zoogeography
Date 2002-04-19
Availability unrestricted
Abstract
Distributional data from 32 years of aerial surveys of southern right whales (Eubalaena australis) along the south coast of South Africa were investigated using GIS, over a variety of spatial and temporal scales to test whether their discontinuous yet predictable distribution is related to environmental characteristics. Most whales were found in areas that provided reasonable protection from open ocean swell and seasonal winds as well as having sedimentary floors with gentle slopes, despite these characteristics being less common. Correlation type analyses with whale density only showed significance at the broadest scale. Cow-calf pairs were found significantly closer to shore and in shallower water than unaccompanied whales; they also segregated longshore in nursery areas. No relationship between reproductive success and distribution was found except a higher than expected incidence of neonatal strandings in areas dominated by unaccompanied whales. Habitat choice at this time of year was concluded to be related both to energy conservation for calves and lactating females and protection of neonates.

2001, University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria.

Please cite as follows:

Elwen, SH 2001, Environmental factors influencing the distribution of southern right whales (Eubalaena australis) on the South African coast, MSc dissertation, University of Pretoria, Pretoria, viewed yymmdd < http://upetd.up.ac.za/thesis/available/etd-11212005-142925/ >

H206/ag

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