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Presence of skeletal banding in a reef-building tropical crustose coralline alga

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dc.contributor Australian Institute Of Marine Science
dc.contributor Australian National University
dc.contributor Griffith Univ
dc.contributor Australian Inst Marine Sci
dc.contributor Griffith University
dc.contributor Arc Ctr Excellence Coral Reef Studies
dc.contributor Griffith Sch Environm
dc.contributor Australian Natl Univ
dc.contributor Australian Rivers Inst Coast & Estuaries
dc.contributor Res Sch Phys & Engn DIAZ-PULIDO, GUILLERMO LEWIS, BONNIE LOUGH, JANICE M. NASH, MERINDA C. 2017-11-05T18:46:40Z 2017-11-05T18:46:40Z 2019-05-09T01:07:45Z 2017-11-05T18:46:40Z 2017-11-05T18:46:40Z 2019-05-09T01:07:45Z 2017-10-04
dc.identifier.citation Lewis B, Lough JM, Nash MC, Diaz-Pulido G (2017) Presence of skeletal banding in a reef-building tropical crustose coralline alga. PLoS ONE 12(10): e0185124
dc.identifier.issn 1932-6203
dc.description.abstract The presence of banding in the skeleton of coralline algae has been reported in many species, primarily from temperate and polar regions. Similar to tree rings, skeletal banding can provide information on growth rate, age, and longevity; as well as records of past environmental conditions and the coralline alga's growth responses to such changes. The aim of this study was to explore the presence and characterise the nature of banding in the tropical coralline alga Porolithon onkodes, an abundant and key reef-building species on the Great Barrier Reef (GBR) Australia, and the Indo-Pacific in general. To achieve this we employed various methods including X-ray diffraction (XRD) to determine seasonal mol% magnesium (Mg), mineralogy mapping to investigate changes in dominant mineral phases, scanning electron microscopy-electron dispersive spectroscopy (SEM-EDS), and micro-computed tomography (micro-CT) scanning to examine changes in cell size and density banding, and UV light to examine reproductive (conceptacle) banding. Seasonal variation in the Mg content of the skeleton did occur and followed previously recorded variations with the highest mol% MgCO3 in summer and lowest in winter, confirming the positive relationship between seawater temperature and mol% MgCO3. Rows of conceptacles viewed under UV light provided easily distinguishable bands that could be used to measure vertical growth rate (1.4 mm year(-1)) and age of the organism. Micro-CT scanning showed obvious banding patterns in relation to skeletal density, and mineralogical mapping revealed patterns of banding created by changes in Mg content. Thus, we present new evidence for seasonal banding patterns in the tropical coralline alga P. onkodes. This banding in the P. onkodes skeleton can provide valuable information into the present and past life history of this important reef-building species, and is essential to assess and predict the response of these organisms to future climate and environmental changes.
dc.description.sponsorship This research was funded by the Great Barrier Reef Foundation (https:/www/ and the Australian Research Council (DP 120101778) grants awarded to GDP.
dc.language English
dc.subject Multidisciplinary Sciences
dc.subject Ocean Acidification
dc.subject Sea
dc.subject Temperature
dc.subject Reconstruction
dc.subject Luminescence
dc.subject Science & Technology - Other Topics
dc.subject Rhodophyta
dc.subject Red Algae
dc.subject Dolomite
dc.subject Resolution
dc.subject Growth-rates
dc.title Presence of skeletal banding in a reef-building tropical crustose coralline alga
dc.type journal article
dc.identifier.doi 10.1371/journal.pone.0185124
dc.identifier.wos WOS:000412163100017

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