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Population dynamics of the shrub Acacia suaveolens (Sm.) Willd.: Seed production and predispersal seed predation
TONY D. AULD,
PETER J. MYERSCOUGH,
TONY D. AULD
School of Biological Sciences, University of Sydney, Sydney. NSW 2006, Australia
National Parks and Wildlife Service NSW, PO Box N189, Grosvenor Street, Sydney, NSW 2000, Australia.
Search for more papers by this authorPETER J. MYERSCOUGH
School of Biological Sciences, University of Sydney, Sydney. NSW 2006, Australia
Search for more papers by this authorTONY D. AULD,
PETER J. MYERSCOUGH,
TONY D. AULD
School of Biological Sciences, University of Sydney, Sydney. NSW 2006, Australia
National Parks and Wildlife Service NSW, PO Box N189, Grosvenor Street, Sydney, NSW 2000, Australia.
Search for more papers by this authorPETER J. MYERSCOUGH
School of Biological Sciences, University of Sydney, Sydney. NSW 2006, Australia
Search for more papers by this authorAbstract
Seed production and predispersal seed predation in the shrub Acacia suaveolens were examined over 3 consecutive years in eight populations in south-eastern Australia. Seed-crop sizes varied both between and within populations of different ages. Seed production was maximal in the first one to four flowering seasons after establishment, and then declined with plant age. The size of the annual seed-crop was also influenced by rainfall for that year.
Predispersal seed predation varies between populations over fruiting seasons with the initial large seed-crops resulting in predator satiation. Within one fruiting season, no significant variation in the extent of predispersal seed predation was found in any of three populations studied. There were two major forms of predispersal seed loss: toss of whole fruits to Melanterius corosus (Coleoptera: Curculionidae) and external insect seed grazers, and loss of individual seeds within fruits to M. corosus. Exclusion experiments showed that seeds lost to these predispersal seed predators would otherwise have been matured by the parent plant. The effects of predispersal seed predation cannot be directly related to seedling recruitment. Indirectly, such predation may influence the dispersion of seeds in the soil profile and hence, subsequent recruitment.
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