Dislodgment and attachment strength of the intertidal macroalga Hormosira banksii (Fucales, Phaeophyceae)

McKenzie, Prudence F. and Bellgrove, Alecia 2009, Dislodgment and attachment strength of the intertidal macroalga Hormosira banksii (Fucales, Phaeophyceae), Phycologia, vol. 48, no. 5, pp. 335-343.

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Title Dislodgment and attachment strength of the intertidal macroalga Hormosira banksii (Fucales, Phaeophyceae)
Formatted title Dislodgment and attachment strength of the intertidal macroalga Hormosira banksii (Fucales, Phaeophyceae)
Author(s) McKenzie, Prudence F.
Bellgrove, Alecia
Journal name Phycologia
Volume number 48
Issue number 5
Start page 335
End page 343
Publisher International Phycological Society
Place of publication Lawrence, Kan.
Publication date 2009-09
ISSN 0031-8884
Keyword(s) dislodgment
dispersal
drifting
floating
fucoid
intertidal
macroalgae
Summary Hormosira banksii is a dominant intertidal alga characterised by limited dispersal of propagules, yet it has a broad distribution throughout temperate Australasia. However, the high abundance of beach wrack of H. banksii on sandy beaches along southwest Victoria, the frequency of frond dislodgment and the force required to break it from the substratum remain unknown. Dislodgment of macroalgae has been shown to influence dispersal processes; therefore, we tested the model that long-distance dispersal of H. banksii is facilitated by weak attachment to the substratum and frequent dislodgment of fertile fronds. We monitored the dislodgment of H. banksii individuals and conducted in situ pull tests to determine the attachment strength of fronds of H. banksii. We further tested whether thallus size or pull direction influenced attachment strength of H. banksii. We found that breakage of vesicles and fronds was a regular event during the survey period and that the mean attachment strength of fronds of H. banksii was weak compared to other intertidal algae. Furthermore, we found that thallus size did not influence the force required to break fronds of H.banksii from the substratum but that the direction that fronds were pulled from the substratum did. We suggest that fronds of H. banksii do drift frequently and that long-distance dispersal is likely to be an important mechanism for the distributional success of this species.
Language eng
Field of Research 060205 Marine and Estuarine Ecology (incl Marine Ichthyology)
Socio Economic Objective 961201 Rehabilitation of Degraded Coastal and Estuarine Environments
HERDC Research category C1 Refereed article in a scholarly journal
HERDC collection year 2009
Copyright notice ©2009, International Phycological Society
Persistent URL http://hdl.handle.net/10536/DRO/DU:30026204

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