Morphology and formation of relict coral reef on the shelf around Lord Howe Island.

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dc.contributor.authorWoodroffe, CDen_AU
dc.contributor.authorBrooke, BPen_AU
dc.contributor.authorLinklater, Men_AU
dc.contributor.authorKennedy, DMen_AU
dc.contributor.authorJones, BGen_AU
dc.contributor.authorBuchanan, Cen_AU
dc.contributor.authorMleczko, Ren_AU
dc.contributor.authorHua, Qen_AU
dc.contributor.authorZhao, JXen_AU
dc.date.accessioned2010-08-31T01:37:28Zen_AU
dc.date.available2010-08-31T01:37:28Zen_AU
dc.date.issued2010-05-06en_AU
dc.date.statistics2010-05-06en_AU
dc.description.abstractCoral reefs track sea level and are particularly sensitive to changes in climate. Reefs are threatened by global warming, with those in tropical waters experiencing increased incidences of bleaching. Although it has been suggested that reefs may extend poleward at their latitudinal limit, there has been little evidence to support this contention. In this paper, we report on a much more extensive coral reef that flourished around Lord Howe Island, which presently supports the southernmost coral reef in the Pacific. Multibeam swath mapping and sub-bottom profiling reveal an extensive reef that encircled the island, in the middle of the shelf, rising from water depths of around 50 m to 30 m, with isolated peaks reaching 23.5 m. Coring has indicated that this relict reef is composed of corals that grew between 9200 and 7100 years ago, and that the main phase of reef growth had terminated and the reef backstepped by 7000 years BP. Localised re-establishment of corals over the surface around 2500 and in the past few hundred years provides some indication that corals may be able to recolonise the relict reef and extend further in response to warmer temperatures anticipated later this century and beyond. However, this will depend on the availability of suitable substrate, as well as other environmental factors, as the relict reef is now in greater water depths than when it was most actively growing.en_AU
dc.description.sponsorshipNational Institute of Water & Atmospheric Researchen_AU
dc.identifier.citationWoodroffe, C. D., Brooke, B. P., Linklater, M., Kennedy, D. M., Jones, D. M., Buchanan, C., Mleczko, R., Hua, Q., Zhao, J. X. (2010). Morphology and formation of relict coral reef on the shelf around Lord Howe Island. Poster presented to the Marine Geological and Biological Habitat Mapping Annual Forum (GEOHAB 2010), 4th – 7th May 2010. Town Hall: Wellington, New Zealand, (pp. 145).en_AU
dc.identifier.conferenceenddate7 May 2010en_AU
dc.identifier.conferencenameMarine Geological and Biological Habitat Mapping Annual Forum (GEOHAB 2010)en_AU
dc.identifier.conferenceplaceWellington, New Zealanden_AU
dc.identifier.conferencestartdate4 May 2010en_AU
dc.identifier.govdoc2363en_AU
dc.identifier.pagination145en_AU
dc.identifier.urihttps://niwa.co.nz/sites/niwa.co.nz/files/import/attachments/GEOHAB2010Handbook.pdfen_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/2381en_AU
dc.language.isoenen_AU
dc.publisherGeoHab (Marine Geological and Biological Habitat Mapping)en_AU
dc.subjectMorphologyen_AU
dc.subjectCoralsen_AU
dc.subjectContinental shelfen_AU
dc.subjectClimatic changeen_AU
dc.subjectSea levelen_AU
dc.subjectIslandsen_AU
dc.titleMorphology and formation of relict coral reef on the shelf around Lord Howe Island.en_AU
dc.typeConference Posteren_AU
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