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Role of zooxanthellae in the thermal tolerance of corals, Great Barrier Reef

Created 24/06/2017

Updated 09/10/2017

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The acclimatization potential of Acropora millepora was investigated through transplantation and experimental manipulation. Twenty-two colonies were sourced from each of a cool southern inshore reef (North Keppel Island) and a cool central offshore reef (Davies Reef) and transplanted to a warm inshore bay (Magnetic Island). A further 22 colonies from each of Magnetic Island, Davies Reef and North Keppel Island were kept at their respective 'native' reefs until their thermal tolerance limits could be experimentally tested together with the transplanted corals kept at Magnetic Island for 9 (Keppels) and 14 months (Davies).

Corals were sampled for zooxanthella genotyping at the time of transplantation and again just before the temperature experiments. Zooxanthellae were identified based on the nuclear ribosomal DNA internal transcribed spacer 1 (ITS1) region using single stranded conformation polymorphism (SSCP) and sequencing analysis.

Twelve nubbins (3-5 cm long) were cut from each of 6 colonies of A. millepora from each of 5 populations (Magnetic Island, North Keppel Island native, North Keppel Island transplants, Davies Reef native and Davies Reef transplants) and distributed equally among 4 temperature treatments (27.5, the non-bleaching control treatment; 30; 31 and 32°C each with 3 treatment replicates) in an indoor aquarium system.

The fluorescence yield (dark-adapted) of zooxanthellae was measured using a Diving-PAM. Dead corals and white bleached corals that could not return a reliable yield were assigned a value of 0. Corals were designated healthy, bleached, dead.

Data loggers have continuously recorded temperatures at half-hourly intervals at Magnetic Island since 1992, and at Davies Reef and Halfway Island (about 15 km from North Keppel Island) since 1995.

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Title Role of zooxanthellae in the thermal tolerance of corals, Great Barrier Reef
Language English
Licence Other
Landing Page https://devweb.dga.links.com.au/data/dataset/6104503e-1044-4e02-9e98-99844ea6d227
Contact Point
Australian Institute of Marine Science
adc@aims.gov.au
Geospatial Coverage {"type": "Polygon", "coordinates": [[[146.0, -21.0], [147.0, -21.0], [147.0, -18.0], [146.0, -18.0], [146.0, -21.0]]]}
Data Portal data.gov.au

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This dataset was originally found on data.gov.au "Role of zooxanthellae in the thermal tolerance of corals, Great Barrier Reef". Please visit the source to access the original metadata of the dataset:
https://devweb.dga.links.com.au/data/dataset/role-of-zooxanthellae-in-the-thermal-tolerance-of-corals-great-barrier-reef

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