2014
DOI: 10.1086/676915
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Macroinvertebrate prey availability and food web dynamics of nonnative trout in a Colorado River tributary, Grand Canyon

Abstract: Abstract.-We examined the influence of water temperature, diet, and feeding sites on growth differences of brown trout Salmo trutta in southeast Minnesota streams. Streams were classified as having either fast or slow growth based on back-calculated lengths at age and incremental growth measurements from scales collected in 2002 and 2003. Mean back-calculated lengths at age in fast-growth streams exceeded 141 mm at age 1, 229 mm at age 2, and 289 mm at age 3. In slowgrowth streams, mean back-calculated lengths… Show more

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Cited by 15 publications
(25 citation statements)
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“…The large-magnitude monsoonal floods that were frequent during our study period did not appear to limit the survival of translocated fishes, but they may have provided an advantage for native fishes that evolved under frequent disturbance regimes (e.g., see Meffe and Minckley 1987;Poff and Ward 1989). Salmonids that are present in the Colorado River and are known to prey upon or potentially compete with Humpback Chub (Marsh and Douglas 1997;Yard et al 2011;Whiting et al 2014;Spurgeon et al 2015a) may be sensitive to tributary flow regimes that differ from those in their native range (see Fausch et al 2001;CattanĂ©o et al 2002;Dibble et al 2015). The successful establishment of Humpback Chub in Havasu Creek may be partially attributed to the rarity of invasive fishes, as newly translocated fish and offspring would face less competition or predation pressure (Olden et al 2008;Whiting et al 2014;Spurgeon et al 2015a).…”
Section: Discussionmentioning
confidence: 96%
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“…The large-magnitude monsoonal floods that were frequent during our study period did not appear to limit the survival of translocated fishes, but they may have provided an advantage for native fishes that evolved under frequent disturbance regimes (e.g., see Meffe and Minckley 1987;Poff and Ward 1989). Salmonids that are present in the Colorado River and are known to prey upon or potentially compete with Humpback Chub (Marsh and Douglas 1997;Yard et al 2011;Whiting et al 2014;Spurgeon et al 2015a) may be sensitive to tributary flow regimes that differ from those in their native range (see Fausch et al 2001;CattanĂ©o et al 2002;Dibble et al 2015). The successful establishment of Humpback Chub in Havasu Creek may be partially attributed to the rarity of invasive fishes, as newly translocated fish and offspring would face less competition or predation pressure (Olden et al 2008;Whiting et al 2014;Spurgeon et al 2015a).…”
Section: Discussionmentioning
confidence: 96%
“…; Whiting et al. ; Spurgeon et al. 2015a) may be sensitive to tributary flow regimes that differ from those in their native range (see Fausch et al.…”
Section: Discussionmentioning
confidence: 99%
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“…Creek. Finally, previous work suggests that tributary food webs-especially Bright Angel Creek-are unique and fundamentally different than simplified mainstem food webs (Whiting, Paukert, Healy, & Spurgeon, 2014) and may, therefore, contribute to enhanced diversity of potential trophic pathways connecting resources to consumers near the Bright Angel Creek confluence. Pulse flows through tributaries during the monsoon reset the food web-increasing FCL and increasing niche width and trophic diversity.…”
Section: Trophic Diversity Was Highest Between the Lcr And Bright Angelmentioning
confidence: 99%
“…A carrying capacity for small tributary streams within Grand Canyon National Park based on food availability has not been estimated; however, tributary streams may support high invertebrate densities (Whiting et al. ). Before translocation, humpback chub were not recorded in surveys above the waterfall separating Shinumo Creek from the mainstem Colorado River.…”
Section: Methodsmentioning
confidence: 99%