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  5. <title>UTas ePrints - The impact of an introduced predator on a threatened galaxiid fish is reduced by the availability of complex habitats</title>
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  13. <meta content="Stuart-Smith, Rick D." name="eprints.creators_name" />
  14. <meta content="Stuart-Smith, Jemina F." name="eprints.creators_name" />
  15. <meta content="White, R.W.G." name="eprints.creators_name" />
  16. <meta content="Barmuta, Leon A." name="eprints.creators_name" />
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  25. <meta content="The impact of an introduced predator on a threatened
  26. galaxiid fish is reduced by the availability of complex
  27. habitats" name="eprints.title" />
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  31. <meta content="brown trout, enclosures, Galaxias auratus, macrophytes, predation risk
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  34. <meta content="1. The availability of complex habitats such as macrophytes may be vital in determining
  35. the outcomes of interactions between introduced predators and native prey. Introduced
  36. brown trout (Salmo trutta) have impacted numerous small native freshwater fishes in the
  37. southern hemisphere, but the potential role of complex habitats in determining the direct
  38. outcomes of brown trout - native fish interactions has not been experimentally evaluated.
  39. 2. An in-lake enclosure experiment was used to evaluate the importance of structurally
  40. complex habitats in affecting the direct impacts of brown trout on a threatened galaxiid
  41. fish. Five Galaxias auratus and a single brown trout were added to enclosures containing
  42. one of three different habitat types (artificial macrophytes, rocks and bare silt substrate).
  43. The experiment also had control enclosures without brown trout. Habitat-dependence of
  44. predation risk was assessed by analysis of G. auratus losses to predation, and stomach
  45. contents of remaining fish were analysed to determine if brown trout directly affect the
  46. feeding of G. auratus and whether this is also habitat-dependent.
  47. 3. Predation risk of G. auratus differed significantly between habitat types, with the highest
  48. mortality in enclosures with only bare silt substrate and the lowest in enclosures
  49. containing artificial macrophytes. This result highlights the importance of availability of
  50. complex habitats for trout - native fish interactions and suggests that increasing habitat
  51. degradation and loss in fresh waters may exacerbate the direct impacts of introduced
  52. predators.
  53. 4. Stomach contents analyses were restricted to fish in enclosures with artificial
  54. macrophytes and rocks, as most fish were consumed in enclosures with brown trout and
  55. only bare silt substrate. These analyses suggest that brown trout do not directly affect the
  56. feeding of G. auratus in complex habitats, but it is still unknown whether its feeding is
  57. reduced if complex habitats are unavailable." name="eprints.abstract" />
  58. <meta content="2007" name="eprints.date" />
  59. <meta content="published" name="eprints.date_type" />
  60. <meta content="Freshwater Biology" name="eprints.publication" />
  61. <meta content="52" name="eprints.volume" />
  62. <meta content="1555-1563" name="eprints.pagerange" />
  63. <meta content="10.1111/j.1365-2427.2007.01787.x" name="eprints.id_number" />
  64. <meta content="UNSPECIFIED" name="eprints.thesis_type" />
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  66. <meta content="http://dx.doi.org/10.1111/j.1365-2427.2007.01787.x" name="eprints.official_url" />
  67. <meta content="Allan J.D. (1978) Trout predation and the size composition
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  79. tethered round gobies (Neogobius melanostomus) to predation in habitats with and without shelters. Journal
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  190. Nocturnal and diurnal feeding by Galaxias auratus,
  191. a lentic galaxiid fish. Ecology of Freshwater Fish, 15,
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  194. (2004) Increasing turbidity significantly alters the diet
  195. of brown trout: a multi-year longitudinal study. Journal
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  198. A shift in the habitat use pattern of a lentic galaxiid
  199. fish: an acute behavioural response to an introduced
  200. predator. Environmental Biology of Fishes. In press.
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  202. Barmuta L.A. (2007b) The effects of turbidity and
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  230. Zambrano L., Scheffer M. &amp; Martinez-Ramos M. (2001)
  231. Catastrophic response of lakes to benthivorous fish
  232. introduction. Oikos, 94, 344-350." name="eprints.referencetext" />
  233. <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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  236. <meta content="The impact of an introduced predator on a threatened
  237. galaxiid fish is reduced by the availability of complex
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  239. <meta content="Stuart-Smith, Rick D." name="DC.creator" />
  240. <meta content="Stuart-Smith, Jemina F." name="DC.creator" />
  241. <meta content="White, R.W.G." name="DC.creator" />
  242. <meta content="Barmuta, Leon A." name="DC.creator" />
  243. <meta content="270701 Freshwater Ecology" name="DC.subject" />
  244. <meta content="1. The availability of complex habitats such as macrophytes may be vital in determining
  245. the outcomes of interactions between introduced predators and native prey. Introduced
  246. brown trout (Salmo trutta) have impacted numerous small native freshwater fishes in the
  247. southern hemisphere, but the potential role of complex habitats in determining the direct
  248. outcomes of brown trout - native fish interactions has not been experimentally evaluated.
  249. 2. An in-lake enclosure experiment was used to evaluate the importance of structurally
  250. complex habitats in affecting the direct impacts of brown trout on a threatened galaxiid
  251. fish. Five Galaxias auratus and a single brown trout were added to enclosures containing
  252. one of three different habitat types (artificial macrophytes, rocks and bare silt substrate).
  253. The experiment also had control enclosures without brown trout. Habitat-dependence of
  254. predation risk was assessed by analysis of G. auratus losses to predation, and stomach
  255. contents of remaining fish were analysed to determine if brown trout directly affect the
  256. feeding of G. auratus and whether this is also habitat-dependent.
  257. 3. Predation risk of G. auratus differed significantly between habitat types, with the highest
  258. mortality in enclosures with only bare silt substrate and the lowest in enclosures
  259. containing artificial macrophytes. This result highlights the importance of availability of
  260. complex habitats for trout - native fish interactions and suggests that increasing habitat
  261. degradation and loss in fresh waters may exacerbate the direct impacts of introduced
  262. predators.
  263. 4. Stomach contents analyses were restricted to fish in enclosures with artificial
  264. macrophytes and rocks, as most fish were consumed in enclosures with brown trout and
  265. only bare silt substrate. These analyses suggest that brown trout do not directly affect the
  266. feeding of G. auratus in complex habitats, but it is still unknown whether its feeding is
  267. reduced if complex habitats are unavailable." name="DC.description" />
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  379. <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>
  380. <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&#13;
  381. the outcomes of interactions between introduced predators and native prey. Introduced&#13;
  382. brown trout (Salmo trutta) have impacted numerous small native freshwater fishes in the&#13;
  383. southern hemisphere, but the potential role of complex habitats in determining the direct&#13;
  384. outcomes of brown trout - native fish interactions has not been experimentally evaluated.&#13;
  385. 2. An in-lake enclosure experiment was used to evaluate the importance of structurally&#13;
  386. complex habitats in affecting the direct impacts of brown trout on a threatened galaxiid&#13;
  387. fish. Five Galaxias auratus and a single brown trout were added to enclosures containing&#13;
  388. one of three different habitat types (artificial macrophytes, rocks and bare silt substrate).&#13;
  389. The experiment also had control enclosures without brown trout. Habitat-dependence of&#13;
  390. predation risk was assessed by analysis of G. auratus losses to predation, and stomach&#13;
  391. contents of remaining fish were analysed to determine if brown trout directly affect the&#13;
  392. feeding of G. auratus and whether this is also habitat-dependent.&#13;
  393. 3. Predation risk of G. auratus differed significantly between habitat types, with the highest&#13;
  394. mortality in enclosures with only bare silt substrate and the lowest in enclosures&#13;
  395. containing artificial macrophytes. This result highlights the importance of availability of&#13;
  396. complex habitats for trout - native fish interactions and suggests that increasing habitat&#13;
  397. degradation and loss in fresh waters may exacerbate the direct impacts of introduced&#13;
  398. predators.&#13;
  399. 4. Stomach contents analyses were restricted to fish in enclosures with artificial&#13;
  400. macrophytes and rocks, as most fish were consumed in enclosures with brown trout and&#13;
  401. only bare silt substrate. These analyses suggest that brown trout do not directly affect the&#13;
  402. feeding of G. auratus in complex habitats, but it is still unknown whether its feeding is&#13;
  403. 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&#13;
  404. </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 &gt; 270700 Ecology and Evolution &gt; 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&amp;eprintid=1294">item control page</a></p>
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