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  5.     <title>UTas ePrints - Variability in the impact of an introduced predator (Asterias amurensis: Asteroidea) on soft-sediment assemblages</title>
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  13.     <meta content="Ross, D. Jeff" name="eprints.creators_name" />
  14. <meta content="Johnson, Craig R." name="eprints.creators_name" />
  15. <meta content="Hewitt, Chad L." name="eprints.creators_name" />
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  23. <meta content="Variability in the impact of an introduced predator (Asterias amurensis: Asteroidea) on soft-sediment assemblages" name="eprints.title" />
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  27. <meta content="Asterias amurensis; Introduced species; Predation; Soft sediments; Variability " name="eprints.keywords" />
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  29. <meta content="The introduction and establishment of the predatory asteroid Asterias amurensis in coastal waters
  30. of southern Australia is considered a major threat to benthic marine assemblages and commercial
  31. bivalve species. We compare the impact of the seastar in experiments on three soft-sediment
  32. assemblages. The experiments were carried out immediately beyond the current range of the seastar
  33. in southeast Tasmania. This allows us to assess the repeatability, and hence predictability, of the type
  34. and magnitude of the impact of A. amurensis on soft-sediment assemblages. Responses to
  35. manipulations at the species level were dissimilar across the three experiments, reflecting marked
  36. initial differences in the three assemblages at both the species and functional group levels. However,
  37. at the functional group level, there were notable similarities in the impact of the seastar on the
  38. different assemblages. When potential prey taxa were separated into functional groups reflecting
  39. ecological availability (e.g. surface dwelling vs. deep burrowing bivalves), seastar effects were
  40. largely restricted to the surface bivalves. While the effect of seastar predation on surface bivalves
  41. was common in all three assemblages, the magnitude of the impact varied both among and within
  42. assemblages. Variability in the impact of A. amurensis at both levels appeared to be largely due to
  43. differences in relative availability of prey species. Overall, the results of these experiments indicate
  44. that while the impact of the seastar is broadly predictable at the functional group level, the exact nature of seastar effects is likely to be site- and time-specific given the inherent natural variability in
  45. soft-sediment assemblages and the seastar's responses to them." name="eprints.abstract" />
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  182. " name="eprints.referencetext" />
  183. <meta content="Ross, D. Jeff and Johnson, Craig R. and Hewitt, Chad L. (2003) Variability in the impact of an introduced predator (Asterias amurensis: Asteroidea) on soft-sediment assemblages. Journal of Experimental Marine Biology and Ecology, 288 (2). pp. 257-278. ISSN 0022-0981" name="eprints.citation" />
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  187. <meta content="Ross, D. Jeff" name="DC.creator" />
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  190. <meta content="270702 Marine and Estuarine Ecology (incl. Marine Ichthyology)" name="DC.subject" />
  191. <meta content="The introduction and establishment of the predatory asteroid Asterias amurensis in coastal waters
  192. of southern Australia is considered a major threat to benthic marine assemblages and commercial
  193. bivalve species. We compare the impact of the seastar in experiments on three soft-sediment
  194. assemblages. The experiments were carried out immediately beyond the current range of the seastar
  195. in southeast Tasmania. This allows us to assess the repeatability, and hence predictability, of the type
  196. and magnitude of the impact of A. amurensis on soft-sediment assemblages. Responses to
  197. manipulations at the species level were dissimilar across the three experiments, reflecting marked
  198. initial differences in the three assemblages at both the species and functional group levels. However,
  199. at the functional group level, there were notable similarities in the impact of the seastar on the
  200. different assemblages. When potential prey taxa were separated into functional groups reflecting
  201. ecological availability (e.g. surface dwelling vs. deep burrowing bivalves), seastar effects were
  202. largely restricted to the surface bivalves. While the effect of seastar predation on surface bivalves
  203. was common in all three assemblages, the magnitude of the impact varied both among and within
  204. assemblages. Variability in the impact of A. amurensis at both levels appeared to be largely due to
  205. differences in relative availability of prey species. Overall, the results of these experiments indicate
  206. that while the impact of the seastar is broadly predictable at the functional group level, the exact nature of seastar effects is likely to be site- and time-specific given the inherent natural variability in
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  321.     <h1 class="ep_tm_pagetitle">Variability in the impact of an introduced predator (Asterias amurensis: Asteroidea) on soft-sediment assemblages</h1>
  322.     <p style="margin-bottom: 1em" class="not_ep_block"><span class="person_name">Ross, D. Jeff</span> and <span class="person_name">Johnson, Craig R.</span> and <span class="person_name">Hewitt, Chad L.</span> (2003) <xhtml:em>Variability in the impact of an introduced predator (Asterias amurensis: Asteroidea) on soft-sediment assemblages.</xhtml:em> Journal of Experimental Marine Biology and Ecology, 288 (2). pp. 257-278. ISSN 0022-0981</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/1187/1/2003_Ross%2C_Johnson_%26_Hewitt_JEMBE.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/1187/1/2003_Ross%2C_Johnson_%26_Hewitt_JEMBE.pdf"><span class="ep_document_citation">PDF</span></a> - Full text restricted - Requires a PDF viewer<br />769Kb</td><td><form method="get" accept-charset="utf-8" action="http://eprints.utas.edu.au/cgi/request_doc"><input accept-charset="utf-8" value="1531" 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/10.1016/S0022-0981(03)00022-4">http://dx.doi.org/10.1016/S0022-0981(03)00022-4</a></p><div class="not_ep_block"><h2>Abstract</h2><p style="padding-bottom: 16px; text-align: left; margin: 1em auto 0em auto">The introduction and establishment of the predatory asteroid Asterias amurensis in coastal waters&#13;
  323. of southern Australia is considered a major threat to benthic marine assemblages and commercial&#13;
  324. bivalve species. We compare the impact of the seastar in experiments on three soft-sediment&#13;
  325. assemblages. The experiments were carried out immediately beyond the current range of the seastar&#13;
  326. in southeast Tasmania. This allows us to assess the repeatability, and hence predictability, of the type&#13;
  327. and magnitude of the impact of A. amurensis on soft-sediment assemblages. Responses to&#13;
  328. manipulations at the species level were dissimilar across the three experiments, reflecting marked&#13;
  329. initial differences in the three assemblages at both the species and functional group levels. However,&#13;
  330. at the functional group level, there were notable similarities in the impact of the seastar on the&#13;
  331. different assemblages. When potential prey taxa were separated into functional groups reflecting&#13;
  332. ecological availability (e.g. surface dwelling vs. deep burrowing bivalves), seastar effects were&#13;
  333. largely restricted to the surface bivalves. While the effect of seastar predation on surface bivalves&#13;
  334. was common in all three assemblages, the magnitude of the impact varied both among and within&#13;
  335. assemblages. Variability in the impact of A. amurensis at both levels appeared to be largely due to&#13;
  336. differences in relative availability of prey species. Overall, the results of these experiments indicate&#13;
  337. that while the impact of the seastar is broadly predictable at the functional group level, the exact nature of seastar effects is likely to be site- and time-specific given the inherent natural variability in&#13;
  338. soft-sediment assemblages and the seastar's responses to them.</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">Definitive version is available online at http://www.sciencedirect.com/</td></tr><tr><th valign="top" class="ep_row">Keywords:</th><td valign="top" class="ep_row">Asterias amurensis; Introduced species; Predation; Soft sediments; Variability </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">1187</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">21 Jun 2007</td></tr><tr><th valign="top" class="ep_row">Last Modified:</th><td valign="top" class="ep_row">04 Feb 2008 16:32</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=1187;">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=1187">item control page</a></p>
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