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Effects of marine snow (transparent exopolymer particles, TEP) on coral recruits, Great Barrier Reef

Created 24/06/2017

Updated 09/10/2017

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The effects on the survivorship of recruits of the hard coral Acropora willisae of muddy coastal sediments, with and without enrichment by 'marine snow', were examined.

The experiment exposed four-week-old recruits to 4 treatments : muddy coastal sediments; transparent exopolymer particles (TEP); TEP-enriched muddy coastal sediments; and unfiltered sea water (control), for 43 h in aerated flow chambers. The recruits survival experiment was run five times, each time using eight new tiles (2 for each treatment). The position, number of polyps, and state (alive, i.e. healthy tissue visible; and dead, i.e. bare skeleton without tissue) of each recruit was mapped on the upper side of each tile before and after exposure using a dissecting microscope. Thirty-three percent of coral recruits died after 43-h exposure to TEP-enriched muddy coastal sediments (~14 mg cm-2 sediments enriched with 3.8 microg cm-2 gum xanthan equivalents [GX] TEP). In contrast, no or minimal mortality was observed in the other three treatments. Mortality increased to >80% when the amount of deposited TEP was almost tripled (10.9 microg cm-2 GX) and sediment increased by 50%. Thus, coral recruits survived short-term exposure to low levels of TEP and low levels of muddy sediments, but sediments enriched with TEP at concentrations recorded at some of the inshore stations proved to be detrimental.

Concentrations were measured in the central Great Barrier Reef in summer (the season of coral spawning and recruitment) for values of TEP (GX L-1), suspended solids, chlorophyll a, phaeopigments, and particulate phosphorus. Samples were taken 200m away from coral reefs ('Ship') during 2 voyages; and 1m above coral reefs ('Reef') on inshore (<10 km from the coast), midshelf (10-25 km) and offshore reefs (40 km or more) only during the first voyage. The station number, date, reef name, distance to coast (km), and number of samples taken were recorded. Within 40 km off the coast.

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Title Effects of marine snow (transparent exopolymer particles, TEP) on coral recruits, Great Barrier Reef
Language English
Licence Other
Landing Page https://devweb.dga.links.com.au/data/dataset/0ee2937a-ea9c-4abe-b148-0cc9d321ed52
Contact Point
Australian Institute of Marine Science
adc@aims.gov.au
Geospatial Coverage {"type": "Polygon", "coordinates": [[[145.4, -18.0], [146.2, -18.0], [146.2, -16.0], [145.4, -16.0], [145.4, -18.0]]]}
Data Portal data.gov.au

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This dataset was originally found on data.gov.au "Effects of marine snow (transparent exopolymer particles, TEP) on coral recruits, Great Barrier Reef". Please visit the source to access the original metadata of the dataset:
https://devweb.dga.links.com.au/data/dataset/effects-of-marine-snow-transparent-exopolymer-particles-tep-on-coral-recruits-great-barrier-ree

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