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Article: Temperate and tropical brown macroalgae thrive, despite decalcification, along natural CO 2 gradients

TitleTemperate and tropical brown macroalgae thrive, despite decalcification, along natural CO 2 gradients
Authors
KeywordsTemperate and tropical coastal ecosystems
Photosynthesis
Ocean acidification
Calcification
Issue Date2012
Citation
Global Change Biology, 2012, v. 18, n. 9, p. 2792-2803 How to Cite?
AbstractPredicting the impacts of ocean acidification on coastal ecosystems requires an understanding of the effects on macroalgae and their grazers, as these underpin the ecology of rocky shores. Whilst calcified coralline algae (Rhodophyta) appear to be especially vulnerable to ocean acidification, there is a lack of information concerning calcified brown algae (Phaeophyta), which are not obligate calcifiers but are still important producers of calcium carbonate and organic matter in shallow coastal waters. Here, we compare ecological shifts in subtidal rocky shore systems along CO 2 gradients created by volcanic seeps in the Mediterranean and Papua New Guinea, focussing on abundant macroalgae and grazing sea urchins. In both the temperate and tropical systems the abundances of grazing sea urchins declined dramatically along CO 2 gradients. Temperate and tropical species of the calcifying macroalgal genus Padina (Dictyoaceae, Phaeophyta) showed reductions in CaCO 3 content with CO 2 enrichment. In contrast to other studies of calcified macroalgae, however, we observed an increase in the abundance of Padina spp. in acidified conditions. Reduced sea urchin grazing pressure and significant increases in photosynthetic rates may explain the unexpected success of decalcified Padina spp. at elevated levels of CO 2. This is the first study to provide a comparison of ecological changes along CO 2 gradients between temperate and tropical rocky shores. The similarities we found in the responses of Padina spp. and sea urchin abundance at several vent systems increases confidence in predictions of the ecological impacts of ocean acidification over a large geographical range. © 2012 Blackwell Publishing Ltd.
Persistent Identifierhttp://hdl.handle.net/10722/213258
ISSN
2015 Impact Factor: 8.444
2015 SCImago Journal Rankings: 5.379

 

DC FieldValueLanguage
dc.contributor.authorJohnson, Vivienne R.-
dc.contributor.authorRussell, Bayden D.-
dc.contributor.authorFabricius, Katharina E.-
dc.contributor.authorBrownlee, Colin-
dc.contributor.authorHall-Spencer, Jason M.-
dc.date.accessioned2015-07-28T04:06:41Z-
dc.date.available2015-07-28T04:06:41Z-
dc.date.issued2012-
dc.identifier.citationGlobal Change Biology, 2012, v. 18, n. 9, p. 2792-2803-
dc.identifier.issn1354-1013-
dc.identifier.urihttp://hdl.handle.net/10722/213258-
dc.description.abstractPredicting the impacts of ocean acidification on coastal ecosystems requires an understanding of the effects on macroalgae and their grazers, as these underpin the ecology of rocky shores. Whilst calcified coralline algae (Rhodophyta) appear to be especially vulnerable to ocean acidification, there is a lack of information concerning calcified brown algae (Phaeophyta), which are not obligate calcifiers but are still important producers of calcium carbonate and organic matter in shallow coastal waters. Here, we compare ecological shifts in subtidal rocky shore systems along CO 2 gradients created by volcanic seeps in the Mediterranean and Papua New Guinea, focussing on abundant macroalgae and grazing sea urchins. In both the temperate and tropical systems the abundances of grazing sea urchins declined dramatically along CO 2 gradients. Temperate and tropical species of the calcifying macroalgal genus Padina (Dictyoaceae, Phaeophyta) showed reductions in CaCO 3 content with CO 2 enrichment. In contrast to other studies of calcified macroalgae, however, we observed an increase in the abundance of Padina spp. in acidified conditions. Reduced sea urchin grazing pressure and significant increases in photosynthetic rates may explain the unexpected success of decalcified Padina spp. at elevated levels of CO 2. This is the first study to provide a comparison of ecological changes along CO 2 gradients between temperate and tropical rocky shores. The similarities we found in the responses of Padina spp. and sea urchin abundance at several vent systems increases confidence in predictions of the ecological impacts of ocean acidification over a large geographical range. © 2012 Blackwell Publishing Ltd.-
dc.languageeng-
dc.relation.ispartofGlobal Change Biology-
dc.subjectTemperate and tropical coastal ecosystems-
dc.subjectPhotosynthesis-
dc.subjectOcean acidification-
dc.subjectCalcification-
dc.titleTemperate and tropical brown macroalgae thrive, despite decalcification, along natural CO 2 gradients-
dc.typeArticle-
dc.description.natureLink_to_subscribed_fulltext-
dc.identifier.doi10.1111/j.1365-2486.2012.02716.x-
dc.identifier.scopuseid_2-s2.0-84864598629-
dc.identifier.volume18-
dc.identifier.issue9-
dc.identifier.spage2792-
dc.identifier.epage2803-
dc.identifier.eissn1365-2486-

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