From Corals to Canyons: The Great Barrier Reef Margin

Webster, Jody M.; Beaman, Robin J.; Bridge, Thomas; Davies, Peter J.; Byrne, Maria; Williams, Stefan B.; Manning, P.B.; Pizarro, Oscar; Thornborough, Kate; Woolsey, Erika; Thomas, Alex L.; Tudhope, Sandy

doi:10.1029/2008eo240002

Cited by 31 publications

(17 citation statements)

References 5 publications

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“…The distinct clades may represent either different GBR refugial populations or immigrants from genetically differentiated locations outside the GBR or a combination of the two, as was also suggested for the two deeply divergent A. polyacanthus lineages along the length of the GBR (van Herwerden and Doherty, 2006). We have no evidence to favour either hypothesis over the others, but note that fossil reefs on the GBR would have been likely candidates for refugial populations to persist at times when the GBR was emergent (Webster et al, 2008). Further analysis of other individuals from locations further to the north (e.g.…”

Section: Discussionmentioning

confidence: 69%

Strong genetic but not spatial subdivision of two reef fish species targeted by fishers on the Great Barrier Reef

et al. 2010

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Section: Discussionmentioning

confidence: 69%

Strong genetic but not spatial subdivision of two reef fish species targeted by fishers on the Great Barrier Reef

et al. 2010

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“…; Webster et al. ). However, when the current zoning plan was enacted in 2004, environmental and ecological data were heavily skewed toward shallow‐water coral reefs, which occupy only 7% of the park's area.…”

Section: Introductionmentioning

confidence: 99%

Factors influencing incidental representation of previously unknown conservation features in marine protected areas

Bridge

Grech

Pressey

2015

Conservation Biology

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Spatially explicit information on species distributions for conservation planning is invariably incomplete; therefore, the use of surrogates is required to represent broad-scale patterns of biodiversity. Despite significant interest in the effectiveness of surrogates for predicting spatial distributions of biodiversity, few researchers have explored questions involving the ability of surrogates to incidentally represent unknown features of conservation interest. We used the Great Barrier Reef marine reserve network to examine factors affecting incidental representation of conservation features that were unknown at the time the reserve network was established. We used spatially explicit information on the distribution of 39 seabed habitats and biological assemblages and the conservation planning software Marxan to examine how incidental representation was affected by the spatial characteristics of the features; the conservation objectives (the minimum proportion of each feature included in no-take areas); the spatial configuration of no-take areas; and the opportunity cost of conservation. Cost was closely and inversely correlated to incidental representation. However, incidental representation was achieved, even in a region with only coarse-scale environmental data, by adopting a precautionary approach that explicitly considered the potential for unknown features. Our results indicate that incidental representation is enhanced by partitioning selection units along biophysical gradients to account for unknown within-feature variability and ensuring that no-take areas are well distributed throughout the region; by setting high conservation objectives that (in this case >33%) maximize the chances of capturing unknown features incidentally; and by carefully considering the designation of cost to planning units when using decision-support tools for reserve design. The lessons learned from incidental representation in the Great Barrier Reef have implications for conservation planning in other regions, particularly those that lack detailed environmental and ecological data.

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“…Specimens (n = 45) collected on a research expedition (Webster et al 2008) were used to assess symbiont diversity from MCEs using denaturing gradient gel electrophoresis (DGGE) fingerprinting of the internal transcribed spacer region 2 (ITS2) of the ribosomal DNA. Symbiodinium diversity was compared to previously published information on related coral taxa from shallower GBR locations to provide a first indication of whether mesophotic corals associate with a distinct deep-water Symbiodinium community and whether known patterns of host-symbiont specificity are maintained across broad bathymetric ranges.…”

Section: Introductionmentioning

confidence: 99%

Symbiodinium diversity in mesophotic coral communities on the Great Barrier Reef: a first assessment

Bongaerts¹,

Sampayo²,

Bridge³

et al. 2011

Mar. Ecol. Prog. Ser.

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Despite a growing interest in mesophotic coral ecosystems (MCEs), information on the photosynthetic endosymbionts (genus Symbiodinium) associated with scleractinian corals inhabiting deep reef ecosystems is sparse. Here, the deep-water Symbiodinium diversity is assessed from 10 different coral genera at a depth range of 45 to 70 m on the Great Barrier Reef (GBR), Australia. Symbiodinium identity was established using denaturing gradient gel electrophoresis (DGGE) fingerprinting of the internal transcribed spacer region 2 (ITS2) of the ribosomal DNA. Except for the novel Symbiodinium type C131 (found in Porites), all Symbiodinium types have previously been identified in shallow reef corals across the Pacific. Specimens of Seriatopora, Montipora, and Porites harboured similar symbionts as reported in shallow water (e.g. C3n, C3n-hh, C15, and C17), thus adhering to patterns of host-specificity across a wide depth range. However, several other Symbiodinium types were found to transcend previously established patterns of host-specificity at mesophotic depths. For example, 'host-specialist' types C3i and C3k (previously only reported in Acropora spp.) were found here to associate with a range of different genera (Leptoseris, Pachyseris, Fungia, and Echinophyllia). Although limited in sample size, this preliminary survey indicates that mesophotic habitats on the GBR may not represent an isolated community in terms of Symbiodinium diversity, which has significant relevance to their potential to act as refugia. Moreover, the present study identifies the need to examine symbiont diversity across broad environmental ranges (including MCEs) in order to gain an accurate understanding of symbiosis specificity and distribution range of specific coral-Symbiodinium associations. KEY WORDS: Symbiodinium · Mesophotic · Deep reefs · Coral · ITS2 · DGGE · Great Barrier ReefResale or republication not permitted without written consent of the publisher Mar Ecol Prog Ser 439: 117-126, 2011 118 zation of Symbiodinium into cladal (e.g. Rowan & Powers 1991, Baker & Rowan 1997 and subcladal types (e.g. van Oppen et al. 2001, LaJeunesse 2002 has greatly enhanced our understanding of the symbiosis. Studies of Symbiodinium diversity on broad latitudinal or longitudinal gradients have shown distinct biogeographical patterns (e.g. LaJeunesse et al. 2003, Silverstein et al. 2011), whereas more local or species-specific studies have highlighted ecological zonation, physiological diversification, and host-specificity of distinct symbionts (e.g. Rowan & Knowlton 1995, LaJeunesse et al. 2003, 2004, Iglesias-Prieto et al. 2004, Sampayo et al. 2007, Frade et al. 2008a.Community-wide shifts in symbiont diversity occur with increasing depth (LaJeunesse 2002, LaJeunesse et al. 2003, 2004, but this observation is likely to be, in part, the result of host community composition changes over depth. Nonetheless, studies focusing on single coral species show a similar pattern, and depth zonation of symbionts has been shown to occur on a cladal...

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From Corals to Canyons: The Great Barrier Reef Margin

Cited by 31 publications

References 5 publications

Strong genetic but not spatial subdivision of two reef fish species targeted by fishers on the Great Barrier Reef

Strong genetic but not spatial subdivision of two reef fish species targeted by fishers on the Great Barrier Reef

Factors influencing incidental representation of previously unknown conservation features in marine protected areas

Symbiodinium diversity in mesophotic coral communities on the Great Barrier Reef: a first assessment

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