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  5.     <title>UTas ePrints - Effects of simulated green turtle regrazing on seagrass abundance, growth and nutritional status in Moreton Bay, south-east Queensland, Australia</title>
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  13.     <meta content="Kuiper-Linley, Marianne" name="eprints.creators_name" />
  14. <meta content="Johnson, Craig R." name="eprints.creators_name" />
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  23. <meta content="Effects of simulated green turtle regrazing on seagrass abundance, growth and nutritional status in Moreton Bay, south-east Queensland, Australia" name="eprints.title" />
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  27. <meta content="Chelonia mydas, disturbance, green turtle, regrazing, seagrass" name="eprints.keywords" />
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  29. <meta content="In some parts of their range, green turtles maintain grazing plots in seagrass beds by regular regrazing.
  30. The effects of simulated repeated grazing on subtropical seagrasses in Moreton Bay, Australia were investigated in
  31. a manipulative experiment over summer. Three seagrass species were subjected to two different clipping frequencies
  32. (simulating turtle cropping) and compared with unclipped controls over a 3.5-month summer period for the effects on
  33. seagrass biomass, leaf size and regrowth rates and water-soluble carbohydrate (WSC) and starch content. The order of
  34. the seagrass species' relative tolerance to simulated grazing was Halophila ovalis>Zostera capricorni>Cymodocea
  35. serrulata. Frequent regrazing of the green turtle's preferred seagrass, H. ovalis, resulted in an increase in leaf regrowth
  36. rate so that standing biomass of leaves and total plant material was maintained, suggesting an increase in productivity.
  37. Furthermore, whole-plant concentrations of WSC increased significantly in clipped H. ovalis plants relative to unclipped
  38. controls. In contrast, leaf biomass of the seagrass species less preferred by turtles, Z. capricorni and C. serrulata, decreased
  39. in response to repeated leaf removal relative to controls, despite maintenance of leaf regrowth rates. C. serrulata responded
  40. to repeated clipping with a reduction in leaf size and a decrease in rhizomeWSCconcentration. Z. capricorni also produced
  41. fewer and smaller newleaves.The ability of the preferred species, H. ovalis, to increase production of nutrient-rich standing
  42. crop in response to regrazing has major implications for green turtles and other seagrass grazers.
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  54. <meta content="Aragones, L. (1996). Dugongs and green turtles: grazers in the tropical
  55. seagrass ecosystem. Ph.D. Thesis, James Cook University, Townsville.
  56. Aragones, L., and Marsh, H. (2000). Impact of dugong grazing and turtle
  57. cropping on tropical seagrass communities. Pacific Conservation
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  75. by immature green turtles Chelonia mydas, in sub-tropical Moreton
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  220. Progress Series 15, 151-158." name="eprints.referencetext" />
  221. <meta content="Kuiper-Linley, Marianne and Johnson, Craig R. and Lanyon, Janet M. (2007) Effects of simulated green turtle regrazing on seagrass abundance, growth and nutritional status in Moreton Bay, south-east Queensland, Australia. Marine and Freshwater Research, 58 (5). pp. 492-503." name="eprints.citation" />
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  225. <meta content="Kuiper-Linley, Marianne" name="DC.creator" />
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  229. <meta content="In some parts of their range, green turtles maintain grazing plots in seagrass beds by regular regrazing.
  230. The effects of simulated repeated grazing on subtropical seagrasses in Moreton Bay, Australia were investigated in
  231. a manipulative experiment over summer. Three seagrass species were subjected to two different clipping frequencies
  232. (simulating turtle cropping) and compared with unclipped controls over a 3.5-month summer period for the effects on
  233. seagrass biomass, leaf size and regrowth rates and water-soluble carbohydrate (WSC) and starch content. The order of
  234. the seagrass species' relative tolerance to simulated grazing was Halophila ovalis>Zostera capricorni>Cymodocea
  235. serrulata. Frequent regrazing of the green turtle's preferred seagrass, H. ovalis, resulted in an increase in leaf regrowth
  236. rate so that standing biomass of leaves and total plant material was maintained, suggesting an increase in productivity.
  237. Furthermore, whole-plant concentrations of WSC increased significantly in clipped H. ovalis plants relative to unclipped
  238. controls. In contrast, leaf biomass of the seagrass species less preferred by turtles, Z. capricorni and C. serrulata, decreased
  239. in response to repeated leaf removal relative to controls, despite maintenance of leaf regrowth rates. C. serrulata responded
  240. to repeated clipping with a reduction in leaf size and a decrease in rhizomeWSCconcentration. Z. capricorni also produced
  241. fewer and smaller newleaves.The ability of the preferred species, H. ovalis, to increase production of nutrient-rich standing
  242. crop in response to regrazing has major implications for green turtles and other seagrass grazers.
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  357.     <h1 class="ep_tm_pagetitle">Effects of simulated green turtle regrazing on seagrass abundance, growth and nutritional status in Moreton Bay, south-east Queensland, Australia</h1>
  358.     <p style="margin-bottom: 1em" class="not_ep_block"><span class="person_name">Kuiper-Linley, Marianne</span> and <span class="person_name">Johnson, Craig R.</span> and <span class="person_name">Lanyon, Janet M.</span> (2007) <xhtml:em>Effects of simulated green turtle regrazing on seagrass abundance, growth and nutritional status in Moreton Bay, south-east Queensland, Australia.</xhtml:em> Marine and Freshwater Research, 58 (5). pp. 492-503.</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 href="http://eprints.utas.edu.au/1100/1/2007_Kuiper-Linley%2C_Johnson_%26_Lanyon_Mar_%26__Freshwat_Res.pdf"><img alt="[img]" src="http://eprints.utas.edu.au/style/images/fileicons/application_pdf.png" class="ep_doc_icon" border="0" /></a></td><td valign="top"><a href="http://eprints.utas.edu.au/1100/1/2007_Kuiper-Linley%2C_Johnson_%26_Lanyon_Mar_%26__Freshwat_Res.pdf"><span class="ep_document_citation">PDF</span></a> - Full text restricted - Requires a PDF viewer<br />254Kb</td><td><form method="get" accept-charset="utf-8" action="http://eprints.utas.edu.au/cgi/request_doc"><input accept-charset="utf-8" value="1348" name="docid" type="hidden" /><div class=""><input value="Request a copy" name="_action_null" class="ep_form_action_button" onclick="return EPJS_button_pushed( '_action_null' )" type="submit" /> </div></form></td></tr></table><p style="margin-bottom: 1em" class="not_ep_block">Official URL: <a href="http://dx.doi.org/10.1071/MF06241">http://dx.doi.org/10.1071/MF06241</a></p><div class="not_ep_block"><h2>Abstract</h2><p style="padding-bottom: 16px; text-align: left; margin: 1em auto 0em auto">In some parts of their range, green turtles maintain grazing plots in seagrass beds by regular regrazing.&#13;
  359. The effects of simulated repeated grazing on subtropical seagrasses in Moreton Bay, Australia were investigated in&#13;
  360. a manipulative experiment over summer. Three seagrass species were subjected to two different clipping frequencies&#13;
  361. (simulating turtle cropping) and compared with unclipped controls over a 3.5-month summer period for the effects on&#13;
  362. seagrass biomass, leaf size and regrowth rates and water-soluble carbohydrate (WSC) and starch content. The order of&#13;
  363. the seagrass species' relative tolerance to simulated grazing was Halophila ovalis&gt;Zostera capricorni&gt;Cymodocea&#13;
  364. serrulata. Frequent regrazing of the green turtle's preferred seagrass, H. ovalis, resulted in an increase in leaf regrowth&#13;
  365. rate so that standing biomass of leaves and total plant material was maintained, suggesting an increase in productivity.&#13;
  366. Furthermore, whole-plant concentrations of WSC increased significantly in clipped H. ovalis plants relative to unclipped&#13;
  367. controls. In contrast, leaf biomass of the seagrass species less preferred by turtles, Z. capricorni and C. serrulata, decreased&#13;
  368. in response to repeated leaf removal relative to controls, despite maintenance of leaf regrowth rates. C. serrulata responded&#13;
  369. to repeated clipping with a reduction in leaf size and a decrease in rhizomeWSCconcentration. Z. capricorni also produced&#13;
  370. fewer and smaller newleaves.The ability of the preferred species, H. ovalis, to increase production of nutrient-rich standing&#13;
  371. crop in response to regrazing has major implications for green turtles and other seagrass grazers.&#13;
  372. </p></div><table style="margin-bottom: 1em" cellpadding="3" class="not_ep_block" border="0"><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">Additional Information:</th><td valign="top" class="ep_row">http://www.publish.csiro.au/nid/126/issue/3710.htm</td></tr><tr><th valign="top" class="ep_row">Keywords:</th><td valign="top" class="ep_row">Chelonia mydas, disturbance, green turtle, regrazing, seagrass</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">1100</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">31 May 2007</td></tr><tr><th valign="top" class="ep_row">Last Modified:</th><td valign="top" class="ep_row">04 Feb 2008 14:28</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=1100;">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=1100">item control page</a></p>
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