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    <title>UTas ePrints - Carbon flux on coral reefs: effects of large shifts in community structure</title>
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    <meta content="Johnson, Craig R." name="eprints.creators_name" />
<meta content="Klumpp, David" name="eprints.creators_name" />
<meta content="Field, John" name="eprints.creators_name" />
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<meta content="Carbon flux on coral reefs: effects of large
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<meta content="Carbon flux; Coral reef; Coral dominated; Algae dominated; Crown-of-thorns star-
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<meta content="The effect of replacement of live coral cover by epilithic algae on patterns and magnitudes
of carbon flux is examined for the shallow front slope of a midshelf reef in the Great Barrier Reef (GBR)
complex of Australia. A steady-state network of carbon exchange among 19 trophic compartments is
constructed for the coral-dominated state. From this, 2 scenarios for patterns of carbon flux when algae
dominate are derived, viz. (1) the increase in algal production is channeled to detrital pathways
(grazers do not respond), and (2) grazers utilise the increase in production of algal carbon so that
transfers to detritus and grazers are in the same proportion as occurs when coral cover is high. The
3 models summarise current knowledge of carbon flux on GBR reef fronts and are compared using
network analysis. Because fluxes in the reef front zone are dominated by exogenous imports and
exports as a result of the high volume of water passing around and over the reef, the analyses ignore
advective fluxes across the zone that are not internalised.The shift in structure to an algae-dominated
system realises lower rates of benthic primary production, and thus system slze and activity (i.e. total
system throughput, internal throughput, development capacity and ascendancy) are reduced, suggest-
ing a disturbed system. With loss of coral cover, the proportion of the total flow that is recycled and
transferred to the detritus pool increases (although the structure of recycling is not affected), and the
balance of pathways in the network is changed: average path length increases, while the average
trophic level of most of the second order consumers, and trophic efiiciencies of most trophic categories,
decreases. Also, there are marked changes in dependencies of particular trophic groups on others. The
analysis shows that, in the coral-dominated state, carbon fixed by zooxanthellae is used indirectly by
most organisms in the system, even those seemingly remotely connected. Differences between the
coral- and algae-dominated systems were much greater than differences between the 2 scenarios for
the algae-dominated state. However, the exact fate of additional algae-derived carbon In the system is
an important consideration since the 2 scenarios for the algae-dominated state yielded dissimilar values
for some parameters (e.g. flow diversity, trophic dependencies and effective trophic levels of some com-
partments, relative importance of recycling, trophic efficiency of some trophic categories).
" name="eprints.abstract" />
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shifts in community structure" name="DC.title" />
<meta content="Johnson, Craig R." name="DC.creator" />
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<meta content="Field, John" name="DC.creator" />
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<meta content="The effect of replacement of live coral cover by epilithic algae on patterns and magnitudes
of carbon flux is examined for the shallow front slope of a midshelf reef in the Great Barrier Reef (GBR)
complex of Australia. A steady-state network of carbon exchange among 19 trophic compartments is
constructed for the coral-dominated state. From this, 2 scenarios for patterns of carbon flux when algae
dominate are derived, viz. (1) the increase in algal production is channeled to detrital pathways
(grazers do not respond), and (2) grazers utilise the increase in production of algal carbon so that
transfers to detritus and grazers are in the same proportion as occurs when coral cover is high. The
3 models summarise current knowledge of carbon flux on GBR reef fronts and are compared using
network analysis. Because fluxes in the reef front zone are dominated by exogenous imports and
exports as a result of the high volume of water passing around and over the reef, the analyses ignore
advective fluxes across the zone that are not internalised.The shift in structure to an algae-dominated
system realises lower rates of benthic primary production, and thus system slze and activity (i.e. total
system throughput, internal throughput, development capacity and ascendancy) are reduced, suggest-
ing a disturbed system. With loss of coral cover, the proportion of the total flow that is recycled and
transferred to the detritus pool increases (although the structure of recycling is not affected), and the
balance of pathways in the network is changed: average path length increases, while the average
trophic level of most of the second order consumers, and trophic efiiciencies of most trophic categories,
decreases. Also, there are marked changes in dependencies of particular trophic groups on others. The
analysis shows that, in the coral-dominated state, carbon fixed by zooxanthellae is used indirectly by
most organisms in the system, even those seemingly remotely connected. Differences between the
coral- and algae-dominated systems were much greater than differences between the 2 scenarios for
the algae-dominated state. However, the exact fate of additional algae-derived carbon In the system is
an important consideration since the 2 scenarios for the algae-dominated state yielded dissimilar values
for some parameters (e.g. flow diversity, trophic dependencies and effective trophic levels of some com-
partments, relative importance of recycling, trophic efficiency of some trophic categories).
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    <h1 class="ep_tm_pagetitle">Carbon flux on coral reefs: effects of large shifts in community structure</h1>
    <p style="margin-bottom: 1em" class="not_ep_block"><span class="person_name">Johnson, Craig R.</span> and <span class="person_name">Klumpp, David</span> and <span class="person_name">Field, John</span> and <span class="person_name">Bradbury, Roger</span> (1995) <xhtml:em>Carbon flux on coral reefs: effects of large shifts in community structure.</xhtml:em> Marine Ecology Progress Series, 126 (1-3). pp. 123-143. ISSN 0171-8630</p><p style="margin-bottom: 1em" class="not_ep_block"></p><table style="margin-bottom: 1em" class="not_ep_block"><tr><td valign="top" style="text-align:center"><a onmouseover="EPJS_ShowPreview( event, 'doc_preview_1645' );" onmouseout="EPJS_HidePreview( event, 'doc_preview_1645' );" href="http://eprints.utas.edu.au/1263/1/johnson-klumpp95.pdf"><img alt="[img]" src="http://eprints.utas.edu.au/style/images/fileicons/application_pdf.png" border="0" class="ep_doc_icon" /></a><div class="ep_preview" id="doc_preview_1645"><table><tr><td><img alt="" src="http://eprints.utas.edu.au/1263/thumbnails/1/preview.png" border="0" class="ep_preview_image" /><div class="ep_preview_title">Preview</div></td></tr></table></div></td><td valign="top"><a href="http://eprints.utas.edu.au/1263/1/johnson-klumpp95.pdf"><span class="ep_document_citation">PDF</span></a> - Requires a PDF viewer<br />2805Kb</td></tr></table><p style="margin-bottom: 1em" class="not_ep_block">Official URL: <a href="http://www.int-res.com/abstracts/meps/v126/p123-143/">http://www.int-res.com/abstracts/meps/v126/p123-143/</a></p><div class="not_ep_block"><h2>Abstract</h2><p style="padding-bottom: 16px; text-align: left; margin: 1em auto 0em auto">The effect of replacement of live coral cover by epilithic algae on patterns and magnitudes&#13;
of carbon flux is examined for the shallow front slope of a midshelf reef in the Great Barrier Reef (GBR)&#13;
complex of Australia. A steady-state network of carbon exchange among 19 trophic compartments is&#13;
constructed for the coral-dominated state. From this, 2 scenarios for patterns of carbon flux when algae&#13;
dominate are derived, viz. (1) the increase in algal production is channeled to detrital pathways&#13;
(grazers do not respond), and (2) grazers utilise the increase in production of algal carbon so that&#13;
transfers to detritus and grazers are in the same proportion as occurs when coral cover is high. The&#13;
3 models summarise current knowledge of carbon flux on GBR reef fronts and are compared using&#13;
network analysis. Because fluxes in the reef front zone are dominated by exogenous imports and&#13;
exports as a result of the high volume of water passing around and over the reef, the analyses ignore&#13;
advective fluxes across the zone that are not internalised.The shift in structure to an algae-dominated&#13;
system realises lower rates of benthic primary production, and thus system slze and activity (i.e. total&#13;
system throughput, internal throughput, development capacity and ascendancy) are reduced, suggest-&#13;
ing a disturbed system. With loss of coral cover, the proportion of the total flow that is recycled and&#13;
transferred to the detritus pool increases (although the structure of recycling is not affected), and the&#13;
balance of pathways in the network is changed: average path length increases, while the average&#13;
trophic level of most of the second order consumers, and trophic efiiciencies of most trophic categories,&#13;
decreases. Also, there are marked changes in dependencies of particular trophic groups on others. The&#13;
analysis shows that, in the coral-dominated state, carbon fixed by zooxanthellae is used indirectly by&#13;
most organisms in the system, even those seemingly remotely connected. Differences between the&#13;
coral- and algae-dominated systems were much greater than differences between the 2 scenarios for&#13;
the algae-dominated state. However, the exact fate of additional algae-derived carbon In the system is&#13;
an important consideration since the 2 scenarios for the algae-dominated state yielded dissimilar values&#13;
for some parameters (e.g. flow diversity, trophic dependencies and effective trophic levels of some com-&#13;
partments, relative importance of recycling, trophic efficiency of some trophic categories).&#13;
</p></div><table style="margin-bottom: 1em" border="0" cellpadding="3" class="not_ep_block"><tr><th valign="top" class="ep_row">Item Type:</th><td valign="top" class="ep_row">Article</td></tr><tr><th valign="top" class="ep_row">Keywords:</th><td valign="top" class="ep_row">Carbon flux; Coral reef; Coral dominated; Algae dominated; Crown-of-thorns star-&#13;
fish; Network analysis</td></tr><tr><th valign="top" class="ep_row">Subjects:</th><td valign="top" class="ep_row"><a href="http://eprints.utas.edu.au/view/subjects/270702.html">270000 Biological Sciences &gt; 270700 Ecology and Evolution &gt; 270702 Marine and Estuarine Ecology (incl. Marine Ichthyology)</a></td></tr><tr><th valign="top" class="ep_row">Collections:</th><td valign="top" class="ep_row">UNSPECIFIED</td></tr><tr><th valign="top" class="ep_row">ID Code:</th><td valign="top" class="ep_row">1263</td></tr><tr><th valign="top" class="ep_row">Deposited By:</th><td valign="top" class="ep_row"><span class="ep_name_citation"><span class="person_name">Professor Craig R. Johnson</span></span></td></tr><tr><th valign="top" class="ep_row">Deposited On:</th><td valign="top" class="ep_row">25 Jun 2007</td></tr><tr><th valign="top" class="ep_row">Last Modified:</th><td valign="top" class="ep_row">04 Feb 2008 17:12</td></tr><tr><th valign="top" class="ep_row">ePrint Statistics:</th><td valign="top" class="ep_row"><a target="ePrintStats" href="/es/index.php?action=show_detail_eprint;id=1263;">View statistics for this ePrint</a></td></tr></table><p align="right">Repository Staff Only: <a href="http://eprints.utas.edu.au/cgi/users/home?screen=EPrint::View&amp;eprintid=1263">item control page</a></p>
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