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<title>UTas ePrints - Substantial allozyme diversity in the freshwater crayfish Parastacoides tasmanicus supports extensive cryptic speciation</title>
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<meta content="Allozyme electrophoretic studies on the freshwater crayfish genus Parastacoides Clark suggest the
presence of several cryptic species within this morphologically conservative taxon. Two independent allozyme
studies were undertaken to assess the validity of the current taxonomy of this monotypic genus. An initial study
examined 42 individuals from 10 sample sets for allozyme variation at 22 putative loci, and a subsequent study
surveyed an additional 72 specimens from 20 sample sets at 16 putative loci. Both studies revealed the same general
outcomes, namely: (1) several instances of sympatric species diagnosable at multiple allozyme loci; (2) numerous
examples of putative allopatric species with significant levels of genetic divergence (25–81% fixed difference,
0.30–1.67 Nei distance) well beyond those found between conspecific populations of any parastacid; (3) broad
genetic affinities among putative species are inconsistent with currently recognised morphotypes; and (4) low levels
of within-population genetic variability, typical of parastacids. Although it is not possible to determine how many
species are represented on the basis of these two preliminary studies, the allozyme data nevertheless indicate that
an absolute minimum of 11 species and perhaps as many as 19 species are likely to be present in the genus. They
indicate the need for a thorough taxonomic revision of the genus using both molecular and morphological data." name="eprints.abstract" />
<meta content="2001" name="eprints.date" />
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<meta content="Invertebrate Systematics" name="eprints.publication" />
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Manuscript received 8 December 2000; revised and accepted 25 May
2001." name="eprints.referencetext" />
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<meta content="Allozyme electrophoretic studies on the freshwater crayfish genus Parastacoides Clark suggest the
presence of several cryptic species within this morphologically conservative taxon. Two independent allozyme
studies were undertaken to assess the validity of the current taxonomy of this monotypic genus. An initial study
examined 42 individuals from 10 sample sets for allozyme variation at 22 putative loci, and a subsequent study
surveyed an additional 72 specimens from 20 sample sets at 16 putative loci. Both studies revealed the same general
outcomes, namely: (1) several instances of sympatric species diagnosable at multiple allozyme loci; (2) numerous
examples of putative allopatric species with significant levels of genetic divergence (25–81% fixed difference,
0.30–1.67 Nei distance) well beyond those found between conspecific populations of any parastacid; (3) broad
genetic affinities among putative species are inconsistent with currently recognised morphotypes; and (4) low levels
of within-population genetic variability, typical of parastacids. Although it is not possible to determine how many
species are represented on the basis of these two preliminary studies, the allozyme data nevertheless indicate that
an absolute minimum of 11 species and perhaps as many as 19 species are likely to be present in the genus. They
indicate the need for a thorough taxonomic revision of the genus using both molecular and morphological data." name="DC.description" />
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<h1 class="ep_tm_pagetitle">Substantial allozyme diversity in the freshwater crayfish Parastacoides tasmanicus supports extensive cryptic speciation</h1>
<p style="margin-bottom: 1em" class="not_ep_block"><span class="person_name">Hansen, Brita</span> and <span class="person_name">Krasnicki, Tom</span> and <span class="person_name">Richardson, A.M.M.</span> (2001) <xhtml:em>Substantial allozyme diversity in the freshwater crayfish Parastacoides tasmanicus supports extensive cryptic speciation.</xhtml:em> Invertebrate Systematics, 15 (5). pp. 667-679.</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/2292/1/AllozymeInvTax.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/2292/1/AllozymeInvTax.pdf"><span class="ep_document_citation">PDF</span></a> - Full text restricted - Requires a PDF viewer<br />525Kb</td><td><form method="get" accept-charset="utf-8" action="http://eprints.utas.edu.au/cgi/request_doc"><input accept-charset="utf-8" value="2928" 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://www.publish.csiro.au/index.cfm">http://www.publish.csiro.au/index.cfm</a></p><div class="not_ep_block"><h2>Abstract</h2><p style="padding-bottom: 16px; text-align: left; margin: 1em auto 0em auto">Allozyme electrophoretic studies on the freshwater crayfish genus Parastacoides Clark suggest the
presence of several cryptic species within this morphologically conservative taxon. Two independent allozyme
studies were undertaken to assess the validity of the current taxonomy of this monotypic genus. An initial study
examined 42 individuals from 10 sample sets for allozyme variation at 22 putative loci, and a subsequent study
surveyed an additional 72 specimens from 20 sample sets at 16 putative loci. Both studies revealed the same general
outcomes, namely: (1) several instances of sympatric species diagnosable at multiple allozyme loci; (2) numerous
examples of putative allopatric species with significant levels of genetic divergence (25–81% fixed difference,
0.30–1.67 Nei distance) well beyond those found between conspecific populations of any parastacid; (3) broad
genetic affinities among putative species are inconsistent with currently recognised morphotypes; and (4) low levels
of within-population genetic variability, typical of parastacids. Although it is not possible to determine how many
species are represented on the basis of these two preliminary studies, the allozyme data nevertheless indicate that
an absolute minimum of 11 species and perhaps as many as 19 species are likely to be present in the genus. They
indicate the need for a thorough taxonomic revision of the genus using both molecular and morphological data.</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">Subjects:</th><td valign="top" class="ep_row"><a href="http://eprints.utas.edu.au/view/subjects/270000.html">270000 Biological Sciences</a></td></tr><tr><th valign="top" class="ep_row">ID Code:</th><td valign="top" class="ep_row">2292</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">A/Prof Alastair Richardson</span></span></td></tr><tr><th valign="top" class="ep_row">Deposited On:</th><td valign="top" class="ep_row">23 Oct 2007 08:56</td></tr><tr><th valign="top" class="ep_row">Last Modified:</th><td valign="top" class="ep_row">09 Jan 2008 02:30</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=2292;">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&eprintid=2292">item control page</a></p>
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