Post-dispersal fate of Acacia seeds in an African savanna

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dc.contributor.authorWalters, Michele
dc.contributor.authorMilton, Suzanne J
dc.contributor.authorSomers, Michael J
dc.contributor.authorMidgley, Jeremy J
dc.date.accessioned2017-04-12T06:38:20Z
dc.date.available2017-04-12T06:38:20Z
dc.date.issued2005
dc.date.updated2016-01-05T10:22:27Z
dc.description.abstractAfrican Acacia species are often major contributors to the progressive increase in the woody component of savannas, a phenomenon commonly referred to as bush encroachment. In Hluhluwe-iMfolozi Park, the numbers of adult Acacia nilotica (L.) Willd. Ex Del. subsp. kraussiana (Benth.) Brenan trees per hectare far exceed those of A. karroo Hayne adults. The relative dominance is reversed in the juvenile stage with A. karroo outnumbering A. nilotica threefold outside closed woodlands. We experimentally investigated the effects of location, structural habitat type, species, predator type and rodent presence on the level of post-dispersal seed predation in an attempt to explain species dominance in HluhluweiMfolozi Park. Post-dispersal predation of A. karroo seeds (21.8%) was higher than that of A. nilotica (12.7%). Predation levels depended on site, structural habitat type, level of protection from different predator types and rodent presence/absence. There was more rodent predation in tall grass areas (26.0%) than grazing lawn (10.7%) or canopy areas (15.2%), and most seeds (19.7%) were lost from unprotected control groups. Rodent presence was a significant factor in a model aiming to determine reasons for unexplained seed disappearance.Post-dispersal predation of seeds could not account for the differences in success between A. karroo and A. nilotica in Hluhluwe-iMfolozi Park.
dc.identifier.apacitationWalters, M., Milton, S. J., Somers, M. J., & Midgley, J. J. (2005). Post-dispersal fate of Acacia seeds in an African savanna. <i>South African Journal of Wildlife Research</i>, http://hdl.handle.net/11427/24181en_ZA
dc.identifier.chicagocitationWalters, Michele, Suzanne J Milton, Michael J Somers, and Jeremy J Midgley "Post-dispersal fate of Acacia seeds in an African savanna." <i>South African Journal of Wildlife Research</i> (2005) http://hdl.handle.net/11427/24181en_ZA
dc.identifier.citationWalters, M., Milton, S. J., Somers, M. J., & Midgley, J. J. (2005). Post-dispersal fate of Acacia seeds in an African savanna. South African Journal of Wildlife Research-24-month delayed open access, 35(2), 191-199.
dc.identifier.ris TY - AU - Walters, Michele AU - Milton, Suzanne J AU - Somers, Michael J AU - Midgley, Jeremy J AB - African Acacia species are often major contributors to the progressive increase in the woody component of savannas, a phenomenon commonly referred to as bush encroachment. In Hluhluwe-iMfolozi Park, the numbers of adult Acacia nilotica (L.) Willd. Ex Del. subsp. kraussiana (Benth.) Brenan trees per hectare far exceed those of A. karroo Hayne adults. The relative dominance is reversed in the juvenile stage with A. karroo outnumbering A. nilotica threefold outside closed woodlands. We experimentally investigated the effects of location, structural habitat type, species, predator type and rodent presence on the level of post-dispersal seed predation in an attempt to explain species dominance in HluhluweiMfolozi Park. Post-dispersal predation of A. karroo seeds (21.8%) was higher than that of A. nilotica (12.7%). Predation levels depended on site, structural habitat type, level of protection from different predator types and rodent presence/absence. There was more rodent predation in tall grass areas (26.0%) than grazing lawn (10.7%) or canopy areas (15.2%), and most seeds (19.7%) were lost from unprotected control groups. Rodent presence was a significant factor in a model aiming to determine reasons for unexplained seed disappearance.Post-dispersal predation of seeds could not account for the differences in success between A. karroo and A. nilotica in Hluhluwe-iMfolozi Park. DA - 2005 DB - OpenUCT DP - University of Cape Town J1 - South African Journal of Wildlife Research LK - https://open.uct.ac.za PB - University of Cape Town PY - 2005 T1 - Post-dispersal fate of Acacia seeds in an African savanna TI - Post-dispersal fate of Acacia seeds in an African savanna UR - http://hdl.handle.net/11427/24181 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/24181
dc.identifier.vancouvercitationWalters M, Milton SJ, Somers MJ, Midgley JJ. Post-dispersal fate of Acacia seeds in an African savanna. South African Journal of Wildlife Research. 2005; http://hdl.handle.net/11427/24181.en_ZA
dc.language.isoeng
dc.publisher.departmentDepartment of Biological Sciencesen_ZA
dc.publisher.facultyFaculty of Scienceen_ZA
dc.publisher.institutionUniversity of Cape Town
dc.sourceSouth African Journal of Wildlife Research
dc.source.urihttps://journals.co.za/content/journal/wild
dc.subject.otherAcacia
dc.subject.otherbush encroachment
dc.subject.othergrassland invasion
dc.subject.otherHluhluwe-iMfolozi Park
dc.subject.otherrodents
dc.subject.otherseed predation
dc.titlePost-dispersal fate of Acacia seeds in an African savanna
dc.typeJournal Article
uct.type.filetypeText
uct.type.filetypeImage
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