Breeding Systems and Genetic Diversity in Acacia auriculiformis and A. crassicarpa

Moran, G. F.; Muona, Outi; Bell, J. C.

doi:10.2307/2388652

Cited by 91 publications

(50 citation statements)

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“…There is also evidence for bi-parental inbreeding in A. sciophanes and the smaller Koonadgin population of A. anfractuosa. These data contrast with the relatively few mating system studies on other Acacia species where very high outcrossing rates with insignificant levels of selfing have been found (Moran et al 1989a;Casiva et al 2004).…”

Section: Mating Systemcontrasting

confidence: 99%

Genetic variation and the mating system in the rare Acacia sciophanes compared with its common sister species Acacia anfractuosa (Mimosaceae)

Coates¹,

Tischler

McComb

2006

Conserv Genet

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Acacia sciophanes is an extremely rare and Critically Endangered species known from two small populations separated by less than 7 km. Specifically we aimed to investigate whether rarity in A. sciophanes is associated with decreased levels of genetic variation and increased levels of selfing by comparing patterns of genetic variation and mating system parameters with its widespread and common sister species A. anfractuosa. Fourteen polymorphic allozyme loci were used to assess genetic diversity with four of these used in the estimation of mating system parameters. At the species level A. sciophanes has lower allelic richness, polymorphism, observed heterozygosity and gene diversity than A. anfractuosa and significantly lower levels of gene diversity at the population level. Both species have a mixed mating system but the largest population of A. sciophanes has lower levels of outcrossing, higher correlated paternity and increased bi-parental inbreeding compared with two A. anfractuosa populations. However, both correlated paternity and bi-parental inbreeding appear to be at least partly influenced by population size regardless of the species. We suggest that A. sciophanes is likely to be an intrinsically rare species and that in particular the lower levels of genetic diversity and increased selfing are a feature of a species that has the ability to persist in a few localised small populations. Despite recent extensive habitat destruction our comparative study provided no clear evidence that such events have contributed to the lower genetic diversity and increased selfing in A. sciophanes and we believe its ability to exist in small populations may not only be an important factor in its survival as a rare species but also indicates that it may be less susceptible to the impacts of habitat loss and fragmentation. The key to this species conservation will be the maintenance of suitable habitat, particularly through improved fire regimes and control of invasive weeds, that will allow the two small populations to continue to persist in extremely restricted areas of remnant vegetation.

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Section: Mating Systemcontrasting

confidence: 99%

Genetic variation and the mating system in the rare Acacia sciophanes compared with its common sister species Acacia anfractuosa (Mimosaceae)

Coates¹,

Tischler

McComb

2006

Conserv Genet

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“…Ex Benth. (Moran et al 1989), plantations of the important tannin-producing species A. mearnsii (Kenrick and Knox 1989) and some populations of A. mangium Willd. (Butcher et al 2000).…”

Section: Discussionmentioning

confidence: 99%

High outcrossing and random pollen dispersal in a planted stand of Acacia saligna subsp. saligna revealed by paternity analysis using microsatellites

Millar

Byrne

Nuberg

et al. 2007

Tree Genetics & Genomes

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“…Although mating system studies were not carried out on the taxa in the A. acuminata complex, studies on other Acacia species indicate very high rates of outcrossing (Moran et al, 1989a;McGranahan et al, 1997). Large population size typical of taxa within this complex combined with high outcrossing rates may provide one explanation for the high levels of genetic diversity observed.…”

Section: Hereditymentioning

confidence: 99%

Genetic diversity within and divergence between rare and geographically widespread taxa of the Acacia acuminata Benth. (Mimosaceae) complex

Broadhurst¹,

Coates²

2002

Heredity

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Breeding Systems and Genetic Diversity in Acacia auriculiformis and A. crassicarpa

Cited by 91 publications

References 0 publications

Genetic variation and the mating system in the rare Acacia sciophanes compared with its common sister species Acacia anfractuosa (Mimosaceae)

Genetic variation and the mating system in the rare Acacia sciophanes compared with its common sister species Acacia anfractuosa (Mimosaceae)

High outcrossing and random pollen dispersal in a planted stand of Acacia saligna subsp. saligna revealed by paternity analysis using microsatellites

Genetic diversity within and divergence between rare and geographically widespread taxa of the Acacia acuminata Benth. (Mimosaceae) complex

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