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dc.contributor.advisorJohnson, Steven Dene.
dc.creatorRambuda, Tendani Dennis.
dc.date.accessioned2014-02-04T09:39:08Z
dc.date.available2014-02-04T09:39:08Z
dc.date.created2001
dc.date.issued2001
dc.identifier.urihttp://hdl.handle.net/10413/10375
dc.descriptionThesis (M.Sc.)-University of Natal, Pietermaritzburg, 2001.en
dc.description.abstractAccording to Baker (1955), success of plant invasions can be attributed to autogamous breeding systems and generalist pollination systems. A test of Baker's rule was carried out on 19 invasive alien plant species in KwaZulu-Natal, South Africa. Natural levels of fruit set in these plants was high (median= 71.5% fruit set per plant). Breeding system experiments for 18 species showed that 17% of the species are allogamous, 72 % are autogamous and 11% are apomictic. This contrasts markedly with a general flora of 1472 species in which 65% are allogamous, only 14% are autogamous, and 21% are apomictic. Because the breeding systems of the alien species were largely autogamous, pollinators make only a small contribution to the overall reproductive success. Seventy one percent of the 14 alien species for which pollinators were obtained were pollinated by honeybees, which are super-generalists and ubiquitous in a generalist pollination systems. However, some species showed pre-adaptation to relatively specialized pollination systems, involving hawkmoths, butterflies and Xylocopa bees respectively. Thus, alien plants were not visited by a wide range of insects, but rather showed pre-adaption to one or more pre-existing guilds in the new habitat. Pollen limitation experiments showed no evidence that reproductive success in populations of the species is limited by pollen availability.en
dc.language.isoen_ZAen
dc.subjectPlant invasions--KwaZulu-Natal.en
dc.subjectInvasive plants--KwaZulu-Natal.en
dc.subjectAlien plants--KwaZulu-Natal.en
dc.subjectPollination.en
dc.subjectTheses--Botany.en
dc.titlePollination and breeding systems of alien invasive plants in KwaZulu - Natal in South Africa.en
dc.typeThesisen


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