Gasheer- en lokaliteitsgebondenheid van die Suid-Afrikaanse verteenwoordigers van die Loranthaceae en Viscaceae
Date
1989
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Stellenbosch : Stellenbosch University
Abstract
ENGLISH ABSTRACT: The various distribution patterns exhibited by the South
African mistletoe species were investigated. On the basis
of distribution area (number of grids) and the distribution
density (averag~ number of
were distinguished, viz.
records per grid), four groups
1. Species with a wide distribution and a high collection
density
2. Species with a wide distribution and a low collection
density
3. Species with a restricted distribution and a high
collection density
4. Species with a restricted distribution and a low
collection density
The degree of association between selected mistletoes and
their hosts were investigated and tested using different
chi2 probability indices . .
No host taxon was found to be exclusively parasitised by a
single mistletoe taxon although a few mistletoe species were
found to have strong positive associations with a singl~
host taxon. The association between Viscum combreticola and
members of the genus Combretum illustrates the latter case.
The taxonomic affinities between parasitised taxa (at order
level) were examined based on the classification of Stebbins
(1974) and Dahlgren (1980). The factors influencing the
compatability between a mistletoe and its host were
investigated and brought into context with the taxa that are
not parasitised.
Description
Proefskrif (M. Sc.) -- Universiteit van Stellenbosch, 1989.
Keywords
Loranthaceae -- South Africa, Mistletoes -- South Africa -- Geographical distribution, Host-parasite relationships, Dissertations -- Botany, UCTD