Science Keywords>BIOLOGICAL CLASSIFICATION
Vulnerability of Antarctic marine benthos to increased temperatures and ocean acidification associated with climate change - x-ray diffractometry of sea urchin skeletonsEntry ID: AAS_3134_XRD
Ocean acidification and warming are global phenomena that will impact marine biota through the 21st century. This project will provide urgently needed predictive information on the likely survivorship of benthic invertebrates in near shore Antarctic environments that is crucial for risk assessment of potential future changes to oceans. As oceans acidify carbonate saturation decreases, ... reducing the material required to produce marine skeletons. By examining the effects of increased ocean temperature and acidification on planktonic and benthic life stages of both calcifying and non-calcifying ecologically important organisms, predictions can be made on the potential vulnerability of marine biota to climatic change.
This project aims to deliver one of the first assessments of the impacts that ocean warming and acidification through rising CO2 levels will have on Antarctic benthic marine invertebrates and of the adaptive capacity of common Antarctic biota to climate change. The developmental success of species that have a skeleton will be compared to those that do not under controlled conditions of increased sea water temperature and CO2. A comparison of the responses and sensitivity of developmental stages of calcifiers (echinoids, bivalves) and non-calcifiers (asteroids) to elevated CO2 and temperature will generate much needed empirical data for assessment of risk and adaptive capacity of Antarctica's marine biota and will enable predictions of how benthic invertebrates will fare with respect to climate change scenarios.
This dataset addresses objective 3, and part of objective 5:
3 - compare the dynamics of biomineralisation with respect to the elemental composition in response to increased temperature and CO2 in species with aragonite and calcite exoskeletons (bivalves) and porous high magnesium calcite endoskeletons (echinoids) to assess the potential for an in-built adaptive response in calcification
5 - compare biomineralisation and elemental signatures in skeletons in larvae of Antarctic molluscs and echinoderms under climate change scenarios with that determined for related species at lower latitudes to assess the relative sensitivity and vulnerability of Antarctic biota.
These data are XRD - x-ray diffractometry of the skeleton to provide data on the element content of the calcite mineral. The Mg2+ level is of interest because the higher the Mg content the more vulnerable the skeleton is to ocean acidification.
Wt% MgCO3 in the calcite sample - for each category; test (- "shell"); Spines (-= lg primary spines) and secondary spines
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Data Set Citation
Dataset Release Date: 2013-03-21
Dataset DOI: http://dx.doi.org/10.4225/15/514A60643769C
This data set description is a member of a collection. The collection is described in
Start Date: 2009-09-30Stop Date: 2012-03-31
Access Constraints These data are publicly available for download from the provided URL.
Use Constraints This data set conforms to the PICCCBY Attribution License
Please follow instructions listed in the citation reference provided at http://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=AAS_3134... when using these data.
Data Set Progress
Distribution Media: HTTP
Distribution Size: 6 kb
Distribution Format: Word
Role: TECHNICAL CONTACT
Phone: +61 2 9351 2222
Email: mel at anatomy.usyd.edu.au
University of Sydney
Province or State: NSW
Postal Code: 2006
Role: DIF AUTHOR
Phone: +61 3 6232 3244
Fax: +61 3 6232 3351
Email: dave.connell at aad.gov.au
Australian Antarctic Division 203 Channel Highway
Province or State: Tasmania
Postal Code: 7050
Extended Metadata Properties
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Creation and Review Dates
DIF Creation Date: 2012-12-23
Last DIF Revision Date: 2013-03-25