2026-09-19T13:37:17.567782900Zhttps://opus.uleth.ca/server/oai/requestoai:opus.uleth.ca:10133/33772019-02-07T06:11:13Zcom_10133_3346com_10133_1com_10133_296col_10133_3347col_10133_298
ULethbridge OPUS Repository
supervisor
Rasmussen, Joseph B.
author
Warnock, Will G
2014-03-26T22:31:27Z
2014-03-26T22:31:27Z
2012
https://hdl.handle.net/10133/3377
Brook 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_CA
Marine biological invasions -- Rocky Mountains (B.C. and Alta.)
Brook trout -- Rocky Mountains (B.C. and Alta.) -- Research
Brook trout -- Behavior
Bull trout -- Rocky Mountains (B.C. and Alta.) -- Research
Bull trout -- Behavior
Dissertations, Academic
Examining brook trout invasion into bull trout streams of the Canadian Rockies
Thesis
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URL
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application/pdf
WARNOCK_WILL_PHD_2012.pdf
URL
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text/plain
WARNOCK_WILL_PHD_2012.pdf.txt