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Restoration of the habitat-forming fucoid alga Hormosira banksii at effluent-affected sites : competitive exclusion by coralline turfs
journal contribution
posted on 2010-11-30, 00:00 authored by Alecia BellgroveAlecia Bellgrove, Prudence McKenzie, J McKenzie, Bianca SfiligojFucoid 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.
History
Journal
Marine ecology - progress seriesVolume
419Pagination
47 - 56Publisher
Inter-ResearchLocation
Oldendorf, GermanyISSN
0171-8630eISSN
1616-1599Language
engPublication classification
C1 Refereed article in a scholarly journal; C Journal articleCopyright notice
2010, Inter-ResearchUsage metrics
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Keywords
Hormosira banksiiRestorationSewage effluentRecruitmentCompetitionEcosystem engineerAlternative stable statesScience & TechnologyLife Sciences & BiomedicinePhysical SciencesEcologyMarine & Freshwater BiologyOceanographyEnvironmental Sciences & EcologyTREATED SEWAGE EFFLUENTCANOPY ALGAEINTERTIDAL COMMUNITIESPOSTSETTLEMENT STAGESROCKY SHOREASSEMBLAGESSURVIVALEMBRYOSGROWTHZoologyOceanographyEcology
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