Restoration of the habitat-forming fucoid alga Hormosira banksii at effluent-affected sites : competitive exclusion by coralline turfs

Bellgrove, Alecia, McKenzie, Prudence F., McKenzie, Jessica L. and Sfiligoj, Bianca J. 2010, Restoration of the habitat-forming fucoid alga Hormosira banksii at effluent-affected sites : competitive exclusion by coralline turfs, Marine ecology - progress series, vol. 419, pp. 47-56.

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Title Restoration of the habitat-forming fucoid alga Hormosira banksii at effluent-affected sites : competitive exclusion by coralline turfs
Formatted title Restoration of the habitat-forming fucoid alga Hormosira banksii at effluent-affected sites: competitive exclusion by coralline turfs.
Author(s) Bellgrove, Alecia
McKenzie, Prudence F.
McKenzie, Jessica L.
Sfiligoj, Bianca J.
Journal name Marine ecology - progress series
Volume number 419
Start page 47
End page 56
Total pages 10
Publisher Inter-Research
Place of publication Oldendorf, Germany
Publication date 2010-11-30
ISSN 0171-8630
1616-1599
Keyword(s) Hormosira banksii
Restoration
Sewage effluent
Recruitment
Competition
Ecosystem engineer
Alternative stable states
Summary Fucoid algae often dominate intertidal rocky shores, providing habitat and modifying ecosystem resources for other species, but are susceptible to discharge of sewage effluent. In this study we assessed the potential for competition from coralline turfs to inhibit restoration of the intertidal fucoid macroalga Hormosira banksii at sites associated with an ocean outfall a scenario of improving following water quality in the nearshore coastal environment. The percentage cover and number of individuals of H. banksii were negatively correlated with both the percentage cover and turf height of Corallina officinalis. In contrast, H. banksii was positively associated with rocky substrata and recruited well to rock-surface substrata. Importantly, there appears to be a threshold abundance where the percentage cover of H. banksii rarely reaches above 20% cover amongst coralline turfs with >40% cover. These data support a model of alternative community states: H. banksii dominated canopy on rocky substrata versus C. officinalis turf. In field and laboratory experiments, extensive coralline turfs (up to 4 cm thick) were shown to inhibit recruitment of H. banksii. This study shows competitive exclusion by coralline turfs may limit the successful restoration of habitat provided by H. banksii to shores that have been affected by sustained discharge of secondarily treated sewage effluent. We suggest potential strategies for management authorities to consider when seeking ways of restoring fucoid communities affected by anthropogenic disturbances such as wastewater disposal.
Language eng
Field of Research 060205 Marine and Estuarine Ecology (incl Marine Ichthyology)
050207 Environmental Rehabilitation (excl Bioremediation)
060701 Phycology (incl Marine Grasses)
Socio Economic Objective 961201 Rehabilitation of Degraded Coastal and Estuarine Environments
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
HERDC collection year 2010
Copyright notice ©2010, Inter-Research
Persistent URL http://hdl.handle.net/10536/DRO/DU:30032270

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