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Linkages between coral assemblages and coral proxies of terrestrial exposure along a cross-shelf gradient on the southern Great Barrier Reef

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dc.contributor Australian Institute Of Marine Science
dc.contributor Australian National University
dc.contributor Wcs S Pacific Country Program
dc.contributor Australian Natl Univ
dc.contributor University Of Queensland
dc.contributor Ctr Marine Studies
dc.contributor Univ Queensland
dc.contributor Australian Inst Marine Sci
dc.contributor Arc Ctr Excellence Coral Reef Studies
dc.contributor Australian Institute Of Marine Science (aims) en HOEGH-GULDBERG, O. JUPITER, S. ROFF, G. MARION, G. HENDERSON, M. SCHRAMEYER, V. MCCULLOCH, M. 2013-02-28T06:50:03Z 2017-03-21T01:20:28Z 2017-03-21T01:20:28Z 2019-07-08T02:45:13Z 2013-02-28T06:50:03Z 2017-03-21T01:20:28Z 2017-03-21T01:20:28Z 2019-07-08T02:45:13Z 2008-12-01
dc.identifier 7877 en
dc.identifier.citation Jupiter SD, Roff G, Marion G, Henderson M, Schrameyer V, McCulloch MT and Hoegh-Guldberg O (2008) Linkages between coral assemblages and coral proxies of terrestrial exposure along a cross-shelf gradient on the southern Great Barrier Reef. Coral Reefs. 27: 887-903. en
dc.identifier.issn 0722-4028
dc.description Link to abstract/full text - en
dc.description.abstract Coral core records, combined with measurements of coral community structure, were used to assess the long-term impact of multiple environmental stressors on reef assemblages along an environmental gradient. Multiple proxies (luminescent lines, Ba/Ca, delta(15) N) that reflect different environmental conditions (freshwater discharge, sediment delivery to the nearshore, nutrient availability and transformations) were measured in Porites coral cores collected from nearshore reefs at increasing distance from the intensively agricultural region of Mackay (Queensland, Australia). The corals provide a record (1968-2002) of the frequency and intensity of exposure to terrestrial runoff and fertilizer-derived nitrogen and were used to assess how the present-day coral community composition may have been influenced by flood-related disturbance. Reefs closest to the mainland (5-32 km offshore) were characterized by low hard coral cover (<= 10%), with no significant differences among locations. Distinct annual luminescent lines and elevated Ba/Ca values (4.98 +/- 0.63 mu mol mol(-1); mean +/- SD) in the most inshore corals (Round Top Island; 5 km offshore) indicated chronic, sub-annual exposure to freshwater and resuspended terrestrial sediment that may have historically prevented reef formation. By contrast, corals from Keswick Island (32 km offshore) indicated episodic, high-magnitude exposure to Pioneer River discharge during extreme flood events (e. g., 1974, 1991), with strongly luminescent lines and substantially enriched coral skeletal delta(15)N (12-14%). The reef assemblages at Keswick and St. Bees islands were categorically different from all other locations, with high fleshy macroalgal cover (80.1 +/- 7.2% and 62.7 +/- 7.1%, respective mean +/- SE) overgrowing dead reef matrix. Coral records from Scawfell Island (51 km offshore) indicated little exposure to Pioneer catchment influence: all locations from Scawfell and further offshore had total hard and soft coral cover comparable to largely undisturbed nearshore to middle shelf reefs of the southern Great Barrier Reef.
dc.description.sponsorship Funding for this project was provided through an ARC Linkage grant (LP050896) to O. Hoegh-Guldberg and M. McCulloch, with significant contributions from the Mackay City Council, the Mackay Whitsunday Natural Resource Management Group and the Great Barrier Reef Marine Park Authority. Fieldwork was conducted aboard the Lara Star, operated by Warren and Barbara Hill, to whom we are very grateful. We thank Les Kinsley, Dave Mucciarone, and Eric Matson for laboratory assistance, and Janice Lough and Terry Done for helpful comments on the manuscript.
dc.description.uri en
dc.language English
dc.language en en
dc.relation.ispartof Coral Reefs - pages: 27: 887-903 en
dc.relation.ispartof Null
dc.subject Behavior
dc.subject Community Structure
dc.subject Algal
dc.subject Disturbance Frequency
dc.subject River
dc.subject Barium
dc.subject Nitrogen
dc.subject Luminescence
dc.subject Lagoon
dc.subject Porites
dc.subject Nitrogen Isotope
dc.subject Record
dc.subject Runoff
dc.subject Marine & Freshwater Biology
dc.subject Coral Assemblage
dc.subject Phase-shifts
dc.title Linkages between coral assemblages and coral proxies of terrestrial exposure along a cross-shelf gradient on the southern Great Barrier Reef
dc.type journal article en
dc.identifier.doi 10.1007/s00338-008-0422-3
dc.identifier.wos WOS:000260616400020

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