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dc.contributor.authorKubanek, Juliaen_US
dc.contributor.authorLester, Sarah E.en_US
dc.contributor.authorFenical, Williamen_US
dc.contributor.authorHay, Mark E.en_US
dc.date.accessioned2010-06-25T20:11:55Z
dc.date.available2010-06-25T20:11:55Z
dc.date.issued2004-08-16
dc.identifier.citationJulia Kubanek, Sarah E. Lester, William Fenical, Mark E. Hay, "Ambiguous role of phlorotannins as chemical defenses in the brown alga Fucus vesiculosus," Marine Ecology Progress Series, 277: 79–93en_US
dc.identifier.issn0171-8630
dc.identifier.urihttp://hdl.handle.net/1853/34055
dc.description© Inter-Research 2004en_US
dc.descriptionDOI: 10.3354/meps277079
dc.description.abstractBrown seaweeds (Fucales) produce phlorotannins that are often considered chemical defenses against herbivores. The many correlative and fewer direct tests conducted have shown effects of phlorotannins on herbivore feeding behavior to be variable. In an attempt to clarify the roles of phlorotannins versus other metabolites in defending brown algae, we conducted bioassay-guided fractionation of herbivore-deterrent extracts from the commonly studied brown alga Fucus vesiculosus. Feeding by the amphipods Ampithoe valida and A. longimana and the sea urchin Arbacia punctulata was suppressed by crude and water-soluble extracts of F. vesiculosus, but this deterrence was lost following storage or fractionation of the active, water-soluble extract. Phlorotannins in these extracts did not decompose in parallel with the loss of feeding deterrence. F. vesiculosus phlorotannins were fed to herbivores at 3 to 12× the isolated yield (or 4.2 to 16.8% of plant dry mass). No herbivore was deterred from feeding by concentrations of 3 or 6×, but A. valida (the only test herbivore that readily consumes F. vesiculosus in the field) was deterred at 12× isolated yield. When juvenile A. valida were raised on an artificial diet containing F. vesiculosus phlorotannins at 3× isolated yield, the phlorotannin-rich diet significantly enhanced, rather than reduced, amphipod survivorship and growth relative to an equivalent diet without phlorotannins. Females ovulated only on the phlorotannin-rich diet. Compounds other than phlorotannins appear to defend the F. vesiculosus populations we investigated, but we were unable to identify these unstable compounds.en_US
dc.language.isoen_USen_US
dc.publisherGeorgia Institute of Technologyen_US
dc.subjectPhlorotanninen_US
dc.subjectFucus vesiculosusen_US
dc.subjectChemical defenseen_US
dc.subjectPlant-herbivore interactionsen_US
dc.subjectAmphipoden_US
dc.subjectUrchinen_US
dc.titleAmbiguous role of phlorotannins as chemical defenses in the brown alga Fucus vesiculosusen_US
dc.typeArticleen_US
dc.contributor.corporatenameGeorgia Institute of Technology. School of Biologyen_US
dc.contributor.corporatenameGeorgia Institute of Technology. School of Chemistry and Biochemistryen_US
dc.contributor.corporatenameUniversity of California, Santa Barbara. Dept. of Ecology, Evolution and Marine Biologyen_US
dc.contributor.corporatenameScripps Institution of Oceanography. Center for Marine Biotechnology and Biomedicineen_US
dc.publisher.originalInter-Research
dc.identifier.doi10.3354/meps277079


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