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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="Leon.Barmuta@utas.edu.au" name="eprints.creators_id" />
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<meta content="2007-08-13" name="eprints.datestamp" />
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<meta content="The impact of an introduced predator on a threatened
galaxiid fish is reduced by the availability of complex
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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
of stream drift. Limnology and Oceanography, 23,
1231-1237.
Almany G.R. (2004) Does increased habitat complexity
reduce predation and competition in coral reef fish
assemblages. Oikos, 106, 275-284.
Beauchamp D.A., Baldwin C.M., Vogel J.L. & Gubala
C.P. (1999) Estimating diel, depth-specific foraging
opportunities with a visual encounter rate model for
pelagic piscivores. Canadian Journal of Fisheries and
Aquatic Sciences, 56(Suppl. 1), 128-139.
Belanger R.M. & Corkum L.D. (2003) Susceptibility of
tethered round gobies (Neogobius melanostomus) to predation in habitats with and without shelters. Journal
of Great Lakes Research, 29, 588-593.
Crowl T.A., Townsend C.R. & McIntosh A.R. (1992) The
impact of introduced brown and rainbow trout on
native fish: the case of Australasia. Reviews in Fish
Biology and Fisheries, 2, 217-241.
Diehl S. (1988) Foraging efficiency of three freshwater
fishes: effects of structural complexity and light. Oikos,
53, 207-214.
Dionne M. & Folt C.L. (1991) An experimental analysis of
macrophyte growth forms as fish foraging habitat.
Canadian Journal of Fisheries and Aquatic Sciences, 48,
123-131.
Foam P.E., Mirza R.S., Chivers D.P. & Brown G.E. (2005)
Juvenile convict cichlids (Archocentrus nigrofasciatus)
allocate foraging and antipredator behaviour in response
to temporal variation in predation risk.
Behaviour, 142, 129-144.
Glova G.J., Sagar P.M. &
Naslund I. (1992) Interaction for
food and space between populations of Galaxias
vulgaris Stokell and juvenile Salmo trutta L. in a
New Zealand stream. Journal of Fish Biology, 41,
909-925.
Hardie S.A. (2003) Current Status and Ecology of the Golden
Galaxias (Galaxias auratus). Inland Fisheries Service.
http://www.ifs.tas.gov.au/ifs/fisherymanagement/
publications (accessed on 27 March 2007).
Hardie S.A., Barmuta L.A. & White R.W.G. (2004)
Threatened fishes of the world: Galaxias auratus
Johnston, 1883 (Galaxiidae). Environmental Biology of
fishes, 71, 126.
Heck K.L. Jr. & Thoman T.A. (1981) Experiments on
predator-prey interactions in vegetated aquatic habitats.
Journal of Experimental Marine Biology and Ecology,
53, 125-134.
Heffer D.K. (2003) Wetlands of Lakes Sorell and Crescent:
Conservation and Management. Inland Fisheries Service,
http://www.ifs.tas.gov.au/ifs/fisherymanagement/
publications (accessed on 27 March 2007).
Heggenes J., Krog O.M.W., Lindas O.R., Dokk J.G. &
Bremnes T. (1993) Homeostatic behavioural responses
in a changing environment: brown trout (Salmo trutta)
become nocturnal during winter. Journal of Animal
Ecology, 62, 295-308.
Hellsten S., Marttunen M., Palomaki R., Riihimaki J. &
Alasaarela E. (1996) Towards an ecologically based
regulation practice in Finnish hydroelectric lakes.
Regulated Rivers: Research & Management, 12, 535-545.
Hilt S., Gross E.M., Hupfer M. et al. (2006) Restoration of
submerged vegetation in shallow eutrophic lakes - a
guideline and state of the art in Germany. Limnologica,
36, 155-171.
Jackson J.E., Raadik T.A., Lintermans M. & Hammer M.
(2004) Alien salmonids in Australia: impediments to
effective impact management, and future directions.
New Zealand Journal of Marine and Freshwater Research,
38, 447-455.
Jones M.L., Eck G.W., Evans D.O., Fabrizio M.C., Hoff
M.H., Hudson P.L., Janssen J., Jude D., O'Gorman R. &
Savino J.F. (1995) Limitations to lake trout (Salvelinus
namaycush) rehabilitation in the Great Lakes imposed
by biotic interactions occurring at early life stages.
Journal of Great Lakes Research, 21(suppl. 1), 505-517.
Manatunge J., Asaeda T. & Priyadarshana T. (2000) The
influence of structural complexity on fish-zooplankton
interactions: a study using artificial submerged macrophytes.
Environmental Biology of Fishes, 58, 425-438.
Marsh P.C. & Douglas M.E. (1997) Predation by
introduced fishes on endangered humpback chub
and other native species in the Little Colorado River,
Arizona. Transactions of the American Fisheries Society,
126, 343-346.
McDowall R.M. (2006) Crying wolf, crying foul, or crying
shame: alien salmonids and a biodiversity crisis in the
southern cool-temperate galaxioid fishes? Reviews
in Fish Biology and Fisheries, 16, 233-422.
McIntosh A.R. (2000) Habitat- and size-related variations
in exotic trout impacts on native galaxiid fishes in New
Zealand streams. Canadian Journal of Fisheries and
Aquatic Sciences, 57, 2140-2151.
Milinski M. & Heller R. (1978) Influence of a predator on
the optimal foraging behaviour of sticklebacks (Gasterosteus
aculeatus). Nature, 275, 642-644.
Persson L. & Eklov P. (1995) Prey refuges affecting
interactions between piscivorous perch and juvenile
perch and roach. Ecology, 76, 70-81.
Pyrovetsi M. & Papastergiadou E. (1992) Biological
conservation implications of water-level fluctuations
in a wetland of international importance - Lake
Kerkini, Macedonia, Greece. Environmental Conservation,
19, 235-244.
Riis T. & Sand-Jensen K. (2001) Historical changes in
species composition and richness accompanying
perturbation and eutrophication of Danish lowland
streams over 100 years. Freshwater Biology, 46, 269-
280.
Ringler N.H. (1979) Selective predation by drift-feeding
brown trout (Salmo trutta). Journal of the Fisheries
Research Board of Canada, 36, 392-403.
Savino J.F. & Stein R.A. (1989) Behavioural interactions
between fish predators and their prey: effects of plant
density. Animal Behaviour, 37, 311-321.
Schwartz J.D.M. (2002) The functional role of fish
diversity in Lake Victoria, East Africa (Uganda, Tanzania, Kenya). Dissertation Abstracts International
Part B: Science and Engineering, 63, 51.
Snickars M., Sandstrom A. & Mattila J. (2004) Antipredator
behaviour of 0+ year Perca fluviatilis: effect of
vegetation density and turbidity. Journal of Fish Biology,
65, 1604-1613.
Stuart-Smith R.D., Barmuta L.A. & White R.W.G. (2006)
Nocturnal and diurnal feeding by Galaxias auratus,
a lentic galaxiid fish. Ecology of Freshwater Fish, 15,
521-531.
Stuart-Smith R.D., Richardson A.M.M. & White R.W.G.
(2004) Increasing turbidity significantly alters the diet
of brown trout: a multi-year longitudinal study. Journal
of Fish Biology, 65, 376-388.
Stuart-Smith R.D., White R.W.G. & Barmuta L.A. (2007a)
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.
Stuart-Smith R.D., Stuart-Smith J.F., White R.W.G. &
Barmuta L.A. (2007b) The effects of turbidity and
complex habitats on the feeding of a galaxiid fish are
clear and simple. Marine and Freshwater Research. In
press.
Stunz G.W. & Minello T.J. (2001) Habitat-related predation
on juvenile wild-caught and hatchery-reared red
drum Sciaenops ocellatus (Linnaeus). Journal of Experimental
Marine Biology and Ecology, 260, 13-25.
Sunardi, Asaeda T. & Manatunge J. (2005) Foraging of a
small planktivore (Pseutlorasbora parva: Cyprinidae)
and its behavioral flexibility in an artificial stream.
Hydrobiologia, 549, 155-166.
Van Buskirk J. & Yurewicz K.L. (1998) Effects of
predators on prey growth rate: relative contributions
of thinning and reduced activity. Oikos, 82, 20-28.
Wissinger S.A., McIntosh A.R. & Greig H.S. (2006)
Impacts of introduced brown and rainbow trout on
benthic invertebrate communities in shallow New
Zealand lakes. Freshwater Biology, 51, 2009-2028.
Wolter C., Minow J., Vilcinskas A. & Grosch U.A. (2000)
Long-term effects of human influence on fish community
structure and fisheries in Berlin waters: an urban
water system. Fisheries Management and Ecology, 7,
97-104.
Woodward G. & Hildrew A.G. (2002) Differential
vulnerability of prey to an invading top predator:
integrating field surveys and laboratory experiments.
Ecological Entomology, 27, 732-744.
Zambrano L., Scheffer M. & Martinez-Ramos M. (2001)
Catastrophic response of lakes to benthivorous fish
introduction. Oikos, 94, 344-350." name="eprints.referencetext" />
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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
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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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