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<title>UTas ePrints - The effects of turbidity and complex habitats on the feeding of a galaxiid fish are clear and simple</title>
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<meta content="Stuart-Smith, Rick D." name="eprints.creators_name" />
<meta content="Stuart-Smith, Jemina F." name="eprints.creators_name" />
<meta content="White, R.W.G." name="eprints.creators_name" />
<meta content="Barmuta, Leon A." name="eprints.creators_name" />
<meta content="rstuarts@utas.edu.au" name="eprints.creators_id" />
<meta content="jfduraj@utas.edu.au" name="eprints.creators_id" />
<meta content="Rob.White@utas.edu.au" name="eprints.creators_id" />
<meta content="Leon.Barmuta@utas.edu.au" name="eprints.creators_id" />
<meta content="article" name="eprints.type" />
<meta content="2007-08-13" name="eprints.datestamp" />
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<meta content="The effects of turbidity and complex habitats on the
feeding of a galaxiid fish are clear and simple" name="eprints.title" />
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<meta content="artificial macrophytes, complex habitats, G. auratus, prey switching.
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<meta content="The habitat used by animals plays an important role in their interactions with predators and prey. By using
complex habitats such as areas of dense macrophyte cover in response to elevated predation risk, small fishes may reduce
their foraging success. Because the threat of predation by introduced brown trout increases the use of complex habitats
by the threatened Galaxias auratus (Johnston), we experimentally examined its foraging in different habitats to estimate
indirect impacts of brown trout presence. The lakes in which G. auratus lives have recently become more turbid, so
the experiment was also conducted under different turbidity levels. Laboratory feeding trials in which planktonic and
epibenthic prey were simultaneously offered to G. auratus in the presence or absence of artificial macrophytes and at
three turbidity levels (0, 50 and 100 NTU) revealed that its overall foraging success was unaffected by habitat complexity;
however, in trials with artificial macrophytes, G. auratus consumed a greater proportion of planktonic prey than in the
absence of artificial macrophytes. Neither overall foraging success nor prey selection by G. auratus was affected by high
turbidity, indicating that water clarity does not appear to directly negatively impact its feeding. The switch in prey types
would probably not be detrimental to G. auratus in the long term, and thus it appears that there is no substantial feeding
cost associated with its increased use of complex habitats. It could, however, affect lower trophic levels in the lakes to
which it is endemic." name="eprints.abstract" />
<meta content="2007" name="eprints.date" />
<meta content="published" name="eprints.date_type" />
<meta content="Marine and Freshwater Research" name="eprints.publication" />
<meta content="58" name="eprints.volume" />
<meta content="429-435" name="eprints.pagerange" />
<meta content="10.1071/MF06240" name="eprints.id_number" />
<meta content="UNSPECIFIED" name="eprints.thesis_type" />
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<meta content="1323-1650" name="eprints.issn" />
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doi:10.2307/1934600" name="eprints.referencetext" />
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<meta content="The habitat used by animals plays an important role in their interactions with predators and prey. By using
complex habitats such as areas of dense macrophyte cover in response to elevated predation risk, small fishes may reduce
their foraging success. Because the threat of predation by introduced brown trout increases the use of complex habitats
by the threatened Galaxias auratus (Johnston), we experimentally examined its foraging in different habitats to estimate
indirect impacts of brown trout presence. The lakes in which G. auratus lives have recently become more turbid, so
the experiment was also conducted under different turbidity levels. Laboratory feeding trials in which planktonic and
epibenthic prey were simultaneously offered to G. auratus in the presence or absence of artificial macrophytes and at
three turbidity levels (0, 50 and 100 NTU) revealed that its overall foraging success was unaffected by habitat complexity;
however, in trials with artificial macrophytes, G. auratus consumed a greater proportion of planktonic prey than in the
absence of artificial macrophytes. Neither overall foraging success nor prey selection by G. auratus was affected by high
turbidity, indicating that water clarity does not appear to directly negatively impact its feeding. The switch in prey types
would probably not be detrimental to G. auratus in the long term, and thus it appears that there is no substantial feeding
cost associated with its increased use of complex habitats. It could, however, affect lower trophic levels in the lakes to
which it is endemic." name="DC.description" />
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<h1 class="ep_tm_pagetitle">The effects of turbidity and complex habitats on the feeding of a galaxiid fish are clear and simple</h1>
<p style="margin-bottom: 1em" class="not_ep_block"><span class="person_name">Stuart-Smith, Rick D.</span> and <span class="person_name">Stuart-Smith, Jemina F.</span> and <span class="person_name">White, R.W.G.</span> and <span class="person_name">Barmuta, Leon A.</span> (2007) <xhtml:em>The effects of turbidity and complex habitats on the feeding of a galaxiid fish are clear and simple.</xhtml:em> Marine and Freshwater Research, 58 . pp. 429-435. ISSN 1323-1650</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/1293/1/MFRpaper.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/1293/1/MFRpaper.pdf"><span class="ep_document_citation">PDF</span></a> - Full text restricted - Requires a PDF viewer<br />219Kb</td></tr></table><p style="margin-bottom: 1em" class="not_ep_block">Official URL: <a href="http://dx.doi.org/10.1071/MF06240">http://dx.doi.org/10.1071/MF06240</a></p><div class="not_ep_block"><h2>Abstract</h2><p style="padding-bottom: 16px; text-align: left; margin: 1em auto 0em auto">The habitat used by animals plays an important role in their interactions with predators and prey. By using
complex habitats such as areas of dense macrophyte cover in response to elevated predation risk, small fishes may reduce
their foraging success. Because the threat of predation by introduced brown trout increases the use of complex habitats
by the threatened Galaxias auratus (Johnston), we experimentally examined its foraging in different habitats to estimate
indirect impacts of brown trout presence. The lakes in which G. auratus lives have recently become more turbid, so
the experiment was also conducted under different turbidity levels. Laboratory feeding trials in which planktonic and
epibenthic prey were simultaneously offered to G. auratus in the presence or absence of artificial macrophytes and at
three turbidity levels (0, 50 and 100 NTU) revealed that its overall foraging success was unaffected by habitat complexity;
however, in trials with artificial macrophytes, G. auratus consumed a greater proportion of planktonic prey than in the
absence of artificial macrophytes. Neither overall foraging success nor prey selection by G. auratus was affected by high
turbidity, indicating that water clarity does not appear to directly negatively impact its feeding. The switch in prey types
would probably not be detrimental to G. auratus in the long term, and thus it appears that there is no substantial feeding
cost associated with its increased use of complex habitats. It could, however, affect lower trophic levels in the lakes to
which it is endemic.</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">Keywords:</th><td valign="top" class="ep_row">artificial macrophytes, complex habitats, G. auratus, prey switching.
</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/270701.html">270000 Biological Sciences > 270700 Ecology and Evolution > 270701 Freshwater Ecology</a></td></tr><tr><th valign="top" class="ep_row">ID Code:</th><td valign="top" class="ep_row">1293</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">Mr Rick D. Stuart-Smith</span></span></td></tr><tr><th valign="top" class="ep_row">Deposited On:</th><td valign="top" class="ep_row">13 Aug 2007</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=1293;">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=1293">item control page</a></p>
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