Examining brook trout invasion into bull trout streams of the Canadian Rockies

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dc.contributor.authorWarnock, Will G
dc.contributor.supervisorRasmussen, Joseph B.
dc.date.accessioned2014-03-26T22:31:27Z
dc.date.available2014-03-26T22:31:27Z
dc.date.issued2012
dc.degree.levelPhD
dc.descriptionxiv, 184 leaves : ill. ; 29 cmen_US
dc.description.abstractBrook trout invasion into bull trout streams is variable, and likely influenced by a suite of biotic and abiotic factors. Field observations revealed that brook trout dominated the fish community over bull trout in warmer sites that had undercut banks; in contrast, bull trout dominated in colder sites that had a high amount of large substrate cover, and where alternate non-native species were present. Laboratory studies of competition between the two species revealed that bull trout use a scramble foraging tactic, whereas brook trout use a territorial tactic. Bull trout outcompeted brook trout when fish density was low and habitat complexity was high, as this scenario reduced the effectiveness of the aggressive territorial foraging strategy of brook trout. Bull trout from a migratory population competed more successfully against brook trout and had higher rates of oxygen consumption than those from a resident population. This combined field-lab study points to some of the abiotic and biotic factors that affect competition between the two species, and may influence the outcome of brook trout invasion into bull trout streams.en_US
dc.identifier.urihttps://hdl.handle.net/10133/3377
dc.language.isoen_CAen_US
dc.publisherLethbridge, Alta. : University of Lethbridge, Dept. of Biological Sciences, c2012en_US
dc.publisher.facultyArts and Scienceen_US
dc.relation.ispartofseriesThesis (University of Lethbridge. Faculty of Arts and Science)en_US
dc.subjectMarine biological invasions -- Rocky Mountains (B.C. and Alta.)en_US
dc.subjectBrook trout -- Rocky Mountains (B.C. and Alta.) -- Researchen_US
dc.subjectBrook trout -- Behavioren_US
dc.subjectBull trout -- Rocky Mountains (B.C. and Alta.) -- Researchen_US
dc.subjectBull trout -- Behavioren_US
dc.subjectDissertations, Academicen_US
dc.titleExamining brook trout invasion into bull trout streams of the Canadian Rockiesen_US
dc.typeThesisen_US
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