Dispersal of Hormosira banksii (phaeophyceae) via detached fragments : reproductive viability and longevity

McKenzie, Prudence F. and Bellgrove, Alecia 2008, Dispersal of Hormosira banksii (phaeophyceae) via detached fragments : reproductive viability and longevity, Journal of phycology, vol. 44, no. 5, pp. 1108-1115.

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Title Dispersal of Hormosira banksii (phaeophyceae) via detached fragments : reproductive viability and longevity
Formatted title Dispersal of Hormosira banksii (phaeophyceae) via detached fragments : reproductive viability and longevity
Author(s) McKenzie, Prudence F.
Bellgrove, Alecia
Journal name Journal of phycology
Volume number 44
Issue number 5
Start page 1108
End page 1115
Publisher Wiley-Blackwell Publishing
Place of publication New York, N.Y.
Publication date 2008-10
ISSN 0022-3646
1529-8817
Keyword(s) dispersal
drifting
floating
fucoid
gene flow
intertidal
macroalgae
reproduction
Summary Drifting, fertile thalli are well documented to be the primary long-distance dispersal vector for many marine macroalgae, but little information about reproductive viability of drift is known. This study examined the reproductive viability and longevity of floating fragments of the intertidal Australasian fucoid Hormosira banksii (Turner) Decne. Beach wrack surveys and field experiments were conducted to test the model that long-distance dispersal is achieved in H. banksii via floating, fertile fronds. High densities of beach wrack fragments were evident during summer compared to autumn. The majority of beach wrack occurred on sandy beaches rather than rocky shores. Both male and female fragments were present in the beach wrack. Detached fronds were capable of releasing gametes up to 8 weeks after detachment. Beach wrack produced high fertilization rates and recruited successfully onto artificial panels. Results suggest that detached fragments are reproductively viable and that floating, fertile fronds may be an important mechanism for facilitating long-distance dispersal in this species. Nevertheless, the frequency of fronds reaching a suitable habitat and contributing to gene flow between populations, or colonizing new populations, may not be proportional to the total density of beach wrack.
Language eng
Field of Research 060701 Phycology (incl Marine Grasses)
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2008, Phycological Society of America
Persistent URL http://hdl.handle.net/10536/DRO/DU:30017423

Document type: Journal Article
Collection: School of Life and Environmental Sciences
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