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    <title>UTas ePrints - Assessing the ecological impacts of an introduced seastar: the importance of multiple methods</title>
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ecological change, management priorities should be based on the severity of immediate and anticipated impacts on
native assemblages and commercial species. This paper synthesizes work on the current and predicted impacts of an
introduced predatory seastar (Asterias amurensis) on soft sediment assemblages, including native species subject to
commercial fishing, in the Derwent Estuary and other areas of southeast Tasmania. Due to the absence of baseline
data prior to the arrival of the seastar and the presence of other anthropogenic stressors in the estuary, estimating
the impact of the seastar is difficult. To help overcome the weaknesses of any single method, our assessment of
impact rests on 'weight of evidence' from multiple approaches. Results from experimental manipulations at small
scales, detailed observations of feeding, and field surveys over a range of spatial scales in areas with and without
the seastar provide strong evidence that predation by the seastar is likely to be responsible for the decline and
subsequent rarity of bivalve species that live just below or on the sediment surface in the Derwent Estuary. The data
suggest that should seastar densities in other areas on the Tasmanian coast attain the current levels in the Derwent
Estuary, there are likely to be large direct effects on native assemblages, particularly on populations of large surface
dwelling bivalves, including several commercial species. Given the seastar's ability to exploit a broad range of food
resources other than bivalves, and the functional importance of bivalves in native systems, we predict broader direct
and indirect effects on native assemblages. We would be unable to reach these same conclusions from a single
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native assemblages and commercial species. This paper synthesizes work on the current and predicted impacts of an
introduced predatory seastar (Asterias amurensis) on soft sediment assemblages, including native species subject to
commercial fishing, in the Derwent Estuary and other areas of southeast Tasmania. Due to the absence of baseline
data prior to the arrival of the seastar and the presence of other anthropogenic stressors in the estuary, estimating
the impact of the seastar is difficult. To help overcome the weaknesses of any single method, our assessment of
impact rests on 'weight of evidence' from multiple approaches. Results from experimental manipulations at small
scales, detailed observations of feeding, and field surveys over a range of spatial scales in areas with and without
the seastar provide strong evidence that predation by the seastar is likely to be responsible for the decline and
subsequent rarity of bivalve species that live just below or on the sediment surface in the Derwent Estuary. The data
suggest that should seastar densities in other areas on the Tasmanian coast attain the current levels in the Derwent
Estuary, there are likely to be large direct effects on native assemblages, particularly on populations of large surface
dwelling bivalves, including several commercial species. Given the seastar's ability to exploit a broad range of food
resources other than bivalves, and the functional importance of bivalves in native systems, we predict broader direct
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    <h1 class="ep_tm_pagetitle">Assessing the ecological impacts of an introduced seastar: the importance of multiple methods</h1>
    <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>Assessing the ecological impacts of an introduced seastar: the importance of multiple methods.</xhtml:em> Biological Invasions, 5 (1-2). pp. 3-21.</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/1186/1/2003_Ross%2C_Johnson_%26_Hewitt_BiologicalInvasions.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/1186/1/2003_Ross%2C_Johnson_%26_Hewitt_BiologicalInvasions.pdf"><span class="ep_document_citation">PDF</span></a> - Full text restricted - Requires a PDF viewer<br />1032Kb</td><td><form method="get" accept-charset="utf-8" action="http://eprints.utas.edu.au/cgi/request_doc"><input accept-charset="utf-8" value="1530" 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/10.1023/A:1024019428616">http://dx.doi.org/10.1023/A:1024019428616</a></p><div class="not_ep_block"><h2>Abstract</h2><p style="padding-bottom: 16px; text-align: left; margin: 1em auto 0em auto">Introduced species are having major impacts in terrestrial, freshwater, and marine ecosystems worldwide. Given&#13;
that resources for management are limited and that only a small percentage of invaders are likely to cause large&#13;
ecological change, management priorities should be based on the severity of immediate and anticipated impacts on&#13;
native assemblages and commercial species. This paper synthesizes work on the current and predicted impacts of an&#13;
introduced predatory seastar (Asterias amurensis) on soft sediment assemblages, including native species subject to&#13;
commercial fishing, in the Derwent Estuary and other areas of southeast Tasmania. Due to the absence of baseline&#13;
data prior to the arrival of the seastar and the presence of other anthropogenic stressors in the estuary, estimating&#13;
the impact of the seastar is difficult. To help overcome the weaknesses of any single method, our assessment of&#13;
impact rests on 'weight of evidence' from multiple approaches. Results from experimental manipulations at small&#13;
scales, detailed observations of feeding, and field surveys over a range of spatial scales in areas with and without&#13;
the seastar provide strong evidence that predation by the seastar is likely to be responsible for the decline and&#13;
subsequent rarity of bivalve species that live just below or on the sediment surface in the Derwent Estuary. The data&#13;
suggest that should seastar densities in other areas on the Tasmanian coast attain the current levels in the Derwent&#13;
Estuary, there are likely to be large direct effects on native assemblages, particularly on populations of large surface&#13;
dwelling bivalves, including several commercial species. Given the seastar's ability to exploit a broad range of food&#13;
resources other than bivalves, and the functional importance of bivalves in native systems, we predict broader direct&#13;
and indirect effects on native assemblages. We would be unable to reach these same conclusions from a single&#13;
approach to assessing impacts. The overall picture from the combination of methods at different scales provides&#13;
more information than the sum of the results of the separate lines of investigation.</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">The original publication is available at www.springerlink.com</td></tr><tr><th valign="top" class="ep_row">Keywords:</th><td valign="top" class="ep_row">Asterias amurensis, ecological variability, impacts, introduced species, multiple methods, predation,&#13;
seastar, soft sediments, Tasmania</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">1186</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 16:33</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=1186;">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=1186">item control page</a></p>
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