Show simple item record

dc.contributor.authorCoombs, G.
dc.contributor.authorPeter, C.I.
dc.contributor.authorJohnson, S.D.
dc.date.accessioned2010-11-15T08:32:00Z
dc.date.available2010-11-15T08:32:00Z
dc.date.issued2009
dc.identifier.citationCoombs, G., Peter, C.I. and Johnson, S.D. (2009). A test for Allee effects in the self-incompatible wasp-pollinated milkweed Gomphocarpus physocarpus. Austral Ecology, 34, 688-697en
dc.identifier.urihttp://hdl.handle.net/123456789/793
dc.description.abstractIt has been suggested that plants that are good colonizers will generally have either an ability to self-fertilize or a generalist pollination system. This prediction is based on the idea that these reproductive traits should confer resistance to Allee effects in founder populations and was tested using Gomphocarpus physocarpus (Asclepiadoideae: Apocynaceae), a species native to South Africa that is invasive in other parts of the world.We found no significant relationships between the size of G. physocarpus populations and various measures of pollination success (pollen deposition, pollen removal and pollen transfer efficiency) and fruit set. A breeding system experiment showed that plants in a South African population are genetically self-incompatible and thus obligate outcrossers. Outcrossing is further enhanced by mechanical reconfiguration of removed pollinaria before the pollinia can be deposited. Self-pollination is reduced when such reconfiguration exceeds the average duration of pollinator visits to a plant. Observations suggest that a wide variety of wasp species in the genera Belonogaster and Polistes (Vespidae) are the primary pollinators.We conclude that efficient pollination of plants in small founding populations, resulting from their generalist wasp-pollination system, contributes in part to the colonizing success of G. physocarpus.The presence of similar wasps in other parts of the world has evidently facilitated the expansion of the range of this milkweed.en
dc.description.sponsorshipCentre of Excellence for Invasion Biologyen
dc.format.extent457710 bytes
dc.format.mimetypeapplication/pdf
dc.language.isoenen
dc.publisherEcological Society of Australiaen
dc.subjectAllee effecten
dc.subjectAsclepiadoideaeen
dc.subjectGomphocarpus physocarpusen
dc.subjectpollen transfer efficiencyen
dc.subjectpollinarium reconfigurationen
dc.subjectself-incompatibleen
dc.subjectwasp pollinationen
dc.titleA test for Allee effects in the self-incompatible wasp-pollinated milkweed Gomphocarpus physocarpusen
dc.typeJournalArticlesen
dc.cibjournalAustral Ecologyen
dc.cibprojectNAen


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record