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Type: Journal article
Title: Variation in reproductive effort, genetic diversity and mating systems across Posidonia australis seagrass meadows in Western Australia
Author: Sinclair, E.A.
Edgeloe, J.M.
Anthony, J.M.
Statton, J.
Breed, M.F.
Kendrick, G.A.
Citation: AoB Plants, 2020; 12(4):plaa038-1-plaa038-12
Publisher: Oxford University Press
Issue Date: 2020
ISSN: 2041-2851
Statement of
Elizabeth A. Sinclair, Jane M. Edgeloe, Janet M. Anthony, John Statton, Martin F. Breed and Gary A. Kendrick
Abstract: Populations at the edges of their geographical range tend to have lower genetic diversity, smaller effective population sizes and limited connectivity relative to centre of range populations. Range edge populations are also likely to be better adapted to more extreme conditions for future survival and resilience in warming environments. However, they may also be most at risk of extinction from changing climate. We compare reproductive and genetic data of the temperate seagrass, Posidonia australis on the west coast of Australia. Measures of reproductive effort (flowering and fruit production and seed to ovule ratios) and estimates of genetic diversity and mating patterns (nuclear microsatellite DNA loci) were used to assess sexual reproduction in northern range edge (low latitude, elevated salinities, Shark Bay World Heritage Site) and centre of range (mid-latitude, oceanic salinity, Perth metropolitan waters) meadows in Western Australia. Flower and fruit production were highly variable among meadows and there was no significant relationship between seed to ovule ratio and clonal diversity. However, Shark Bay meadows were two orders of magnitude less fecund than those in Perth metropolitan waters. Shark Bay meadows were characterized by significantly lower levels of genetic diversity and a mixed mating system relative to meadows in Perth metropolitan waters, which had high genetic diversity and a completely outcrossed mating system. The combination of reproductive and genetic data showed overall lower sexual productivity in Shark Bay meadows relative to Perth metropolitan waters. The mixed mating system is likely driven by a combination of local environmental conditions and pollen limitation. These results indicate that seagrass restoration in Shark Bay may benefit from sourcing plant material from multiple reproductive meadows to increase outcrossed pollen availability and seed production for natural recruitment.
Keywords: Environmental gradient; mating system; microsatellite DNA loci; monoecy; outcrossing rate; Posidonia australis; restoration; seed abortion
Rights: © The Author(s) 2020. Published by Oxford University Press on behalf of the Annals of Botany Company. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (, which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.
RMID: 1000026523
DOI: 10.1093/aobpla/plaa038
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Appears in Collections:Earth and Environmental Sciences publications

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