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No outbreeding depression at a regional scale for a habitat-forming intertidal alga with limited dispersal
journal contribution
posted on 2006-08-31, 00:00 authored by Prudence McKenzie, Alecia BellgroveAlecia BellgroveHormosira banksii is distributed throughout southern Australasia, but dispersal of propagules is thought to be limited. In the present study, the hypothesis that outbreeding depression occurs in H. banksii was tested by assessing fertilisation success and early development of embryos in crosses between populations at local to regional spatial scales. Hierarchical experiments were conducted at three spatial scales with nesting present within each scale: small scale (within a rocky shore population), intermediate scale (regions separated by 70 km) and large scale (450-km separation between two states: Victoria and Tasmania). In each experiment, eggs and sperm were crossed within and between each population located in the spatial scale of interest. There were no consistent patterns of variable fertilisation success and subsequent development within a population or at different spatial scales. It was concluded that outbreeding depression is not detected in analyses of fertilisation success or early development processes in H. banksii. The results suggest one of the following to be likely: (1) H. banksii is capable of longer distance dispersal than previously considered, thus maintaining gene flow between distant populations, (2) gene flow is restricted by limited dispersal, but populations have not been isolated for a sufficient length of time to cause genetic divergence or (3) outbreeding depression is manifested as effects on later life-history stages.
History
Journal
Marine & freshwater researchVolume
57Issue
6Pagination
655 - 663Publisher
CSIRO PublishingLocation
Collingwood, Vic.Publisher DOI
ISSN
1323-1650eISSN
1448-6059Language
engPublication classification
C1 Refereed article in a scholarly journalCopyright notice
2006, CSIROUsage metrics
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No categories selectedKeywords
cross-fertilisationdispersalfucoidgametesHormosira banksiiScience & TechnologyLife Sciences & BiomedicinePhysical SciencesFisheriesLimnologyMarine & Freshwater BiologyOceanographyTREATED SEWAGE EFFLUENTHORMOSIRA-BANKSIIINBREEDING DEPRESSIONIPOMOPSIS-AGGREGATADELPHINIUM-NELSONIISELF-FERTILIZATIONPROGENY FITNESSMATING SUCCESSRECRUITMENTPHAEOPHYTA
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