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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" />
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- <meta content="2007-08-13" name="eprints.datestamp" />
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- galaxiid fish is reduced by the availability of complex
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- <meta content="270701" name="eprints.subjects" />
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- <meta content="brown trout, enclosures, Galaxias auratus, macrophytes, predation risk
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- <meta content="1. The availability of complex habitats such as macrophytes may be vital in determining
- the outcomes of interactions between introduced predators and native prey. Introduced
- brown trout (Salmo trutta) have impacted numerous small native freshwater fishes in the
- southern hemisphere, but the potential role of complex habitats in determining the direct
- outcomes of brown trout - native fish interactions has not been experimentally evaluated.
- 2. An in-lake enclosure experiment was used to evaluate the importance of structurally
- complex habitats in affecting the direct impacts of brown trout on a threatened galaxiid
- fish. Five Galaxias auratus and a single brown trout were added to enclosures containing
- one of three different habitat types (artificial macrophytes, rocks and bare silt substrate).
- The experiment also had control enclosures without brown trout. Habitat-dependence of
- predation risk was assessed by analysis of G. auratus losses to predation, and stomach
- contents of remaining fish were analysed to determine if brown trout directly affect the
- feeding of G. auratus and whether this is also habitat-dependent.
- 3. Predation risk of G. auratus differed significantly between habitat types, with the highest
- mortality in enclosures with only bare silt substrate and the lowest in enclosures
- containing artificial macrophytes. This result highlights the importance of availability of
- complex habitats for trout - native fish interactions and suggests that increasing habitat
- degradation and loss in fresh waters may exacerbate the direct impacts of introduced
- predators.
- 4. Stomach contents analyses were restricted to fish in enclosures with artificial
- macrophytes and rocks, as most fish were consumed in enclosures with brown trout and
- only bare silt substrate. These analyses suggest that brown trout do not directly affect the
- feeding of G. auratus in complex habitats, but it is still unknown whether its feeding is
- reduced if complex habitats are unavailable." name="eprints.abstract" />
- <meta content="2007" name="eprints.date" />
- <meta content="published" name="eprints.date_type" />
- <meta content="Freshwater Biology" name="eprints.publication" />
- <meta content="52" name="eprints.volume" />
- <meta content="1555-1563" name="eprints.pagerange" />
- <meta content="10.1111/j.1365-2427.2007.01787.x" name="eprints.id_number" />
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- <meta content="http://dx.doi.org/10.1111/j.1365-2427.2007.01787.x" name="eprints.official_url" />
- <meta content="Allan J.D. (1978) Trout predation and the size composition
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- Nocturnal and diurnal feeding by Galaxias auratus,
- a lentic galaxiid fish. Ecology of Freshwater Fish, 15,
- 521-531.
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- (2004) Increasing turbidity significantly alters the diet
- of brown trout: a multi-year longitudinal study. Journal
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- A shift in the habitat use pattern of a lentic galaxiid
- fish: an acute behavioural response to an introduced
- predator. Environmental Biology of Fishes. In press.
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- Barmuta L.A. (2007b) The effects of turbidity and
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- on juvenile wild-caught and hatchery-reared red
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- small planktivore (Pseutlorasbora parva: Cyprinidae)
- and its behavioral flexibility in an artificial stream.
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- predators on prey growth rate: relative contributions
- of thinning and reduced activity. Oikos, 82, 20-28.
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- benthic invertebrate communities in shallow New
- Zealand lakes. Freshwater Biology, 51, 2009-2028.
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- Long-term effects of human influence on fish community
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- Catastrophic response of lakes to benthivorous fish
- introduction. Oikos, 94, 344-350." name="eprints.referencetext" />
- <meta content="Stuart-Smith, Rick D. and Stuart-Smith, Jemina F. and White, R.W.G. and Barmuta, Leon A. (2007) The impact of an introduced predator on a threatened galaxiid fish is reduced by the availability of complex habitats. Freshwater Biology, 52 . pp. 1555-1563." name="eprints.citation" />
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- <meta content="1. The availability of complex habitats such as macrophytes may be vital in determining
- the outcomes of interactions between introduced predators and native prey. Introduced
- brown trout (Salmo trutta) have impacted numerous small native freshwater fishes in the
- southern hemisphere, but the potential role of complex habitats in determining the direct
- outcomes of brown trout - native fish interactions has not been experimentally evaluated.
- 2. An in-lake enclosure experiment was used to evaluate the importance of structurally
- complex habitats in affecting the direct impacts of brown trout on a threatened galaxiid
- fish. Five Galaxias auratus and a single brown trout were added to enclosures containing
- one of three different habitat types (artificial macrophytes, rocks and bare silt substrate).
- The experiment also had control enclosures without brown trout. Habitat-dependence of
- predation risk was assessed by analysis of G. auratus losses to predation, and stomach
- contents of remaining fish were analysed to determine if brown trout directly affect the
- feeding of G. auratus and whether this is also habitat-dependent.
- 3. Predation risk of G. auratus differed significantly between habitat types, with the highest
- mortality in enclosures with only bare silt substrate and the lowest in enclosures
- containing artificial macrophytes. This result highlights the importance of availability of
- complex habitats for trout - native fish interactions and suggests that increasing habitat
- degradation and loss in fresh waters may exacerbate the direct impacts of introduced
- predators.
- 4. Stomach contents analyses were restricted to fish in enclosures with artificial
- macrophytes and rocks, as most fish were consumed in enclosures with brown trout and
- only bare silt substrate. These analyses suggest that brown trout do not directly affect the
- feeding of G. auratus in complex habitats, but it is still unknown whether its feeding is
- reduced if complex habitats are unavailable." name="DC.description" />
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- <h1 class="ep_tm_pagetitle">The impact of an introduced predator on a threatened galaxiid fish is reduced by the availability of complex habitats</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 impact of an introduced predator on a threatened galaxiid fish is reduced by the availability of complex habitats.</xhtml:em> Freshwater Biology, 52 . pp. 1555-1563.</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/1294/1/Fbiopdf.pdf"><img alt="[img]" src="http://eprints.utas.edu.au/style/images/fileicons/application_pdf.png" border="0" class="ep_doc_icon" /></a></td><td valign="top"><a href="http://eprints.utas.edu.au/1294/1/Fbiopdf.pdf"><span class="ep_document_citation">PDF</span></a> - Full text restricted - Requires a PDF viewer<br />167Kb</td><td><form method="get" accept-charset="utf-8" action="http://eprints.utas.edu.au/cgi/request_doc"><input value="1688" name="docid" accept-charset="utf-8" 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/10.1111/j.1365-2427.2007.01787.x">http://dx.doi.org/10.1111/j.1365-2427.2007.01787.x</a></p><div class="not_ep_block"><h2>Abstract</h2><p style="padding-bottom: 16px; text-align: left; margin: 1em auto 0em auto">1. The availability of complex habitats such as macrophytes may be vital in determining
- the outcomes of interactions between introduced predators and native prey. Introduced
- brown trout (Salmo trutta) have impacted numerous small native freshwater fishes in the
- southern hemisphere, but the potential role of complex habitats in determining the direct
- outcomes of brown trout - native fish interactions has not been experimentally evaluated.
- 2. An in-lake enclosure experiment was used to evaluate the importance of structurally
- complex habitats in affecting the direct impacts of brown trout on a threatened galaxiid
- fish. Five Galaxias auratus and a single brown trout were added to enclosures containing
- one of three different habitat types (artificial macrophytes, rocks and bare silt substrate).
- The experiment also had control enclosures without brown trout. Habitat-dependence of
- predation risk was assessed by analysis of G. auratus losses to predation, and stomach
- contents of remaining fish were analysed to determine if brown trout directly affect the
- feeding of G. auratus and whether this is also habitat-dependent.
- 3. Predation risk of G. auratus differed significantly between habitat types, with the highest
- mortality in enclosures with only bare silt substrate and the lowest in enclosures
- containing artificial macrophytes. This result highlights the importance of availability of
- complex habitats for trout - native fish interactions and suggests that increasing habitat
- degradation and loss in fresh waters may exacerbate the direct impacts of introduced
- predators.
- 4. Stomach contents analyses were restricted to fish in enclosures with artificial
- macrophytes and rocks, as most fish were consumed in enclosures with brown trout and
- only bare silt substrate. These analyses suggest that brown trout do not directly affect the
- feeding of G. auratus in complex habitats, but it is still unknown whether its feeding is
- reduced if complex habitats are unavailable.</p></div><table style="margin-bottom: 1em" border="0" cellpadding="3" class="not_ep_block"><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 definitive version is available at www.blackwell-synergy.com</td></tr><tr><th valign="top" class="ep_row">Keywords:</th><td valign="top" class="ep_row">brown trout, enclosures, Galaxias auratus, macrophytes, predation risk
- </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">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">1294</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">12 Feb 2008 10:22</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=1294;">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=1294">item control page</a></p>
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