Seasonal Survival, Movement, and Habitat Use of Age-0 Rainbow Trout in the Henrys Fork of the Snake River, Idaho

Mitro, Matthew G.; Zale, Alexander V.

doi:10.1577/1548-8659(2002)131<0271:ssmahu>2.0.co;2

Cited by 42 publications

(53 citation statements)

References 14 publications

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“…Evidence also exists that suggests that the availability of winter habitat limits RBT recruitment in the Snake River. A recent study in the Henry's Fork of the Snake River showed that age-0 RBT survived only where complex bank habitat was present, limiting RBT to lower elevation locations (Mitro and Zale 2002).…”

Section: Spatial Patterns Of Hybridizationmentioning

confidence: 99%

Geographic patterns of introgressive hybridization between native Yellowstone cutthroat trout (Oncorhynchus clarkii bouvieri) and introduced rainbow trout (O. mykiss) in the South Fork of the Snake River watershed, Idaho

et al. 2007

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Throughout its native range, the Yellowstone cutthroat trout (YCT), Oncorhynchus clarkii bouvieri, is declining dramatically in both abundance and distribution as a result of introgression with introduced rainbow trout (RBT), O. mykiss. We sampled over 1,200 trout from the South Fork of the Snake River (SFSR) watershed, in southeastern Idaho and western Wyoming, and measured the extent of introgression of RBT genes into native gene pools of YCT using seven species-specific, co-dominant nuclear genetic markers. We also used mitochondrial DNA (mtDNA) haplotype differences between the two parental trout species to determine the directionality of the hybridization. We found low levels of RBT introgression (only 7% of sampled individuals had one or more RBT alleles) into YCT gene pools, with the majority of hybrids (78%) occurring in mainstem localities of the SFSR and in lower elevation reaches of certain tributaries. Hybridization was bidirectional with respect to mtDNA haplotype, but the majority of hybrids (75%) had YCT maternal haplotypes, indicative of the greater proportion (90%) of YCT-genotypes in the SFSR watershed. The primary factor influencing the geographic distribution of RBT introgressed individuals was fluvial distance from localities of stocking origin. To a lesser extent, elevation, also influenced the distribution of hybrid genotypes, with several entire tributaries and all upper elevation reaches within tributaries harboring only YCT-genotypes. Important management implications of the study suggest targeting particular tributaries and upper reaches within tributaries for YCT protection and exclusion of RBT hybrid colonization.

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Section: Spatial Patterns Of Hybridizationmentioning

confidence: 99%

Geographic patterns of introgressive hybridization between native Yellowstone cutthroat trout (Oncorhynchus clarkii bouvieri) and introduced rainbow trout (O. mykiss) in the South Fork of the Snake River watershed, Idaho

et al. 2007

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“…Recently, flow regime was identified as a factor influencing the invasion success of RBT; in particular, a match between timing of fry emergence and months of low flow appears to be associated with successful invasion (Fausch et al 2001). Evidence also exists that suggests that the availability of winter habitat limits RBT recruitment in the Snake River (Idaho), and that age)0 trout survived only where complex bank habitat was present (Mitro and Zale 2002). Consequently, an analysis of flow regimes and habitat types within the upper Kootenay River drainage may aid in predicting which tributaries are at greatest risk of RBT invasion, a pre-requisite to hybridization with native WCT.…”

Section: Environmental Correlates Of Hybridizationmentioning

confidence: 99%

An analysis of spatial and environmental factors influencing hybridization between native westslope cutthroat trout (Oncorhynchus clarki lewisi) and introduced rainbow trout (O. mykiss) in the upper Kootenay River drainage, British Columbia

Rubidge

Taylor

2005

Conserv Genet

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An analysis of spatial and environmental factors influencing hybridization between native westslope cutthroat trout (Oncorhynchus clarkii lewisi) and introduced rainbow trout (O. mykiss) in the upper Kootenay River drainage, British Columbia Abstract Westslope cutthroat trout (Oncorhynchus clarki lewisi, WCT) and introduced rainbow trout (O. mykiss, RBT) readily hybridize and introgression has occurred in many drainages across the historic native range of WCT. In British Columbia (Canada), the upper Kootenay River drainage is the heart of the WCT distribution and is thought to harbour native gene pools, but many population are thought to be under threat from hybridization with introduced rainbow trout (RBT, O. mykiss). In this study, we assess the extent and distribution of WCT · RBT hybridization in the upper Kootenay River drainage. We used four diagnostic nuclear loci to determine the extent of hybridization in 981 fish collected from 23 sample localities across 12 different streams in the upper Kootenay River drainage. About 14% (142/981) of individuals were identified as hybrids (an individual with both RBT and WCT alleles), 3.4% (33/981) were identified as pure RBT, and the remaining individuals were identified as pure WCT. Although pure RBT were absent from the majority of locales (20/23), we found evidence of hybridization at 78% (18/23) of the localities and the percentage of heterospecific alleles (% I) ranged from 0.7% to 97.1%. Only 22% (5/23) of the localities showed no evidence of hybridization. Spatial analysis showed clustering among hybridized locations and decreasing hybridization with increasing distance from Koocanusa Reservoir, suggesting that the reservoir acts as a RBT source. We found no evidence that stream order, stream magnitude, or stream elevation influenced the extent of hybridization among localities. We compared our results to an analysis conducted in 1986, which indicated that hybridization is relatively recent in the upper Kootenay River drainage and that it is increasing in magnitude and distribution. In the absence of timely management intervention, the genetic integrity of WCT populations in the heart of their Canadian range may be lost. Our results indicate the dynamic nature of hybridization in fluvial systems and that for closely related taxa such as WCT and RBT, hybridization appears to be largely influenced by physical barriers to dispersal and contact between species.

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“…They found evidence that availability of winter habitat limited rainbow trout recruitment in the Henrys Fork. Most river sections in the Henrys Fork had only simple bank habitat and did not support age-0 rainbow trout throughout winter (Mitro and Zale 2002a). The winter habitat that supported age-0 trout was complex bank habitat, and age-0 trout survived throughout winter only where such habitat was present, primarily in the Box Canyon river section.…”

Section: Introductionmentioning

confidence: 98%

“…In a study of rainbow trout (Oncorhynchus mykiss) recruitment in the Henrys Fork of the Snake River, Idaho, Mitro and Zale (2002a) investigated when apparent mortality of age-0 trout occurred seasonally and where recruitment occurred in a 25-km reach of the river system. They found evidence that availability of winter habitat limited rainbow trout recruitment in the Henrys Fork.…”

Section: Introductionmentioning

confidence: 99%

The relation between age-0 rainbow trout (Oncorhynchus mykiss) abundance and winter discharge in a regulated river

Mitro¹,

Zale²,

Rich³

2003

Can. J. Fish. Aquat. Sci.

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We identified and experimentally tested a discharge-abundance relation that predicted, based on the mean river discharge in the second half of winter (15 January -31 March), the spring abundance of age-0 rainbow trout (Oncorhynchus mykiss) in a section of the Henrys Fork of the Snake River, Idaho, with complex bank habitat. We also considered a competing hypothesis in which autumn abundance determined spring abundance. We established that large abundances of age-0 trout were present in autumn (34 000 -81 000) and lower abundances remained in spring (8000 -15 000). Winter loss of age-0 trout was initiated in January. Spring abundance in 1996-1998 was related to autumn abundance (r 2 > 0.99) and mean discharge in the second half of winter (17.1-22.8 m 3 ·s -1 ; r 2 > 0.99) but not mean discharge in the first half of winter (15.1-21.1 m 3 ·s -1 ; r 2 = 0.11). We experimentally maintained a high discharge (20-21 m 3 ·s -1 ) in the second half of winter in 1999 to test model predictions. Autumn abundance failed to predict spring abundance (observed = 11 109; predicted = 6822; 95% prediction interval = 4669-8975). However, the dischargeabundance model accurately predicted spring abundance (predicted = 11 980; 95% prediction interval = 10 728 -13 231). Higher discharge in the second half of winter may have provided more bank habitat at a critical time for survival.Résumé : Nous avons découvert et vérifié expérimentalement une relation entre le débit et l'abondance qui prédit, d'après le débit moyen de la rivière durant la seconde moitié de l'hiver (15 janvier -31 mars), l'abondance des truites arc-en-ciel (Oncorhynchus mykiss) d'âge 0 au printemps dans un secteur à habitats de berge complexes dans le tributaire the Henrys Fork de la rivière Snake en Idaho. Nous avons aussi examiné une hypothèse de rechange qui relie l'abondance au printemps à l'abondance à l'automne. Les abondances de truites d'âge 0 sont fortes à l'automne (34 000 -81 000) et plus faibles au printemps (8000 -15 000). La perte de truites d'âge 0 commence en janvier. L'abondance au printemps en 1996-1998 était fonction de l'abondance à l'automne (r 2 > 0,99) et du débit moyen dans la seconde moitié (17,1-22,8 m 3 ·s -1 ; r 2 > 0,99), mais pas dans la première moitié (15,1-21,1 m 3 ·s -1 ; r 2 = 0,11) de l'hiver. Nous avons maintenu expérimentalement un débit élevé (20-21 m 3 ·s -1 ) pendant la seconde moitié de l'hiver en 1999 pour vérifier les prédictions du modèle. L'abondance en automne n'a pas permis de prédire l'abondance au printemps (observée = 11 109; prédite = 6822; intervalle de prédiction 95 % = 4669-8975). En revanche, le modèle basé sur le débit et l'abondance a prédit de façon précise l'abondance au printemps (prédite = 11 980; intervalle de prédic-tion 95 % = 10 728 -13 231). Le fort débit durant la seconde moitié de l'hiver accroît probablement les habitats de berge à un moment critique pour la survie.[Traduit par la Rédaction] Mitro et al. 139

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Seasonal Survival, Movement, and Habitat Use of Age-0 Rainbow Trout in the Henrys Fork of the Snake River, Idaho

Cited by 42 publications

References 14 publications

Geographic patterns of introgressive hybridization between native Yellowstone cutthroat trout (Oncorhynchus clarkii bouvieri) and introduced rainbow trout (O. mykiss) in the South Fork of the Snake River watershed, Idaho

Geographic patterns of introgressive hybridization between native Yellowstone cutthroat trout (Oncorhynchus clarkii bouvieri) and introduced rainbow trout (O. mykiss) in the South Fork of the Snake River watershed, Idaho

An analysis of spatial and environmental factors influencing hybridization between native westslope cutthroat trout (Oncorhynchus clarki lewisi) and introduced rainbow trout (O. mykiss) in the upper Kootenay River drainage, British Columbia

The relation between age-0 rainbow trout (Oncorhynchus mykiss) abundance and winter discharge in a regulated river

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