A Three‐Dimensional Seismic Survey Applied to Field Development in the Williston Basin

Robinson, Gary; Baixas, F.; Hooyman, Patrick J.

doi:10.1190/1.1807561

Cited by 1 publication

(5 citation statements)

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“…It is therefore likely that the native kokanee population that diverged from Thutade Lake has been extirpated due to the widespread introduction of Columbia River‐type kokanee. This loss of native kokanee in the reservoir was not due to introgression with introduced kokanee, as was of concern to management (Langston 2012; McDermot‐Fouts 2019; Robinson 2020), but instead was likely due to intraspecific competition, as the Columbia River‐origin lineage became the dominant pelagic fish in the reservoir (Sebastian et al. 2009).…”

Section: Discussionmentioning

confidence: 99%

“…that flow into the southwestern portion of the reservoir, all of which are considered to be safer and more accessible for anglers than the northernmost reach (Blackman et al 1990;Langston and Murphy 2008). Ongoing aerial abundance surveys have documented a widespread distribution of kokanee since the 1990s (Langston 2012;McDermot-Fouts 2019;Robinson 2020). In 2006, the introduced kokanee were reported to spawn in at least 68 rivers and streams from the Parsnip River watershed to the Finlay River watershed (Figure 1; Langston 2012).…”

Section: Impact Statementmentioning

confidence: 99%

“…Heavily managed sport fisheries that stock large numbers of kokanee may not experience a great degree of reproductive isolation between spawning groups (Whitlock et al 2018). Because Columbia River-type kokanee were stocked intensively in this system for almost a decade, have strayed significantly from their five original stocking locations (Langston 2012;McDermot-Fouts 2019;Robinson 2020), and have been shown to continue to stray (Shrimpton et al 2022), substantive genetic divergence between kokanee spawning locations has likely been constrained thus far.…”

Section: Population Structure Of Tributary Spawnersmentioning

confidence: 99%

“…It is therefore likely that the native kokanee population that diverged from Thutade Lake has been extirpated due to the widespread introduction of Columbia River-type kokanee. This loss of native kokanee in the reservoir was not due to introgression with introduced kokanee, as was of concern to management (Langston 2012;McDermot-Fouts 2019;Robinson 2020), but instead was likely due to intraspecific competition, as the Columbia River-origin lineage became the dominant pelagic fish in the reservoir (Sebastian et al 2009). The presence of kokanee downstream of Bennett Dam (Babaluk et al 2000;Murphy et al 2004;Algera et al 2020) raises an additional concern: that the introduced kokanee may colonize (naturally or by deliberate or inadvertent transplant) other regions of the watershed downstream from Williston Reservoir, thereby potentially impacting native populations or species that have not already been disrupted by impoundment.…”

Section: Persistence Of Native Williston Reservoir Kokaneementioning

confidence: 99%

“…1990; Langston and Murphy 2008). Ongoing aerial abundance surveys have documented a widespread distribution of kokanee since the 1990s (Langston 2012; McDermot‐Fouts 2019; Robinson 2020). In 2006, the introduced kokanee were reported to spawn in at least 68 rivers and streams from the Parsnip River watershed to the Finlay River watershed (Figure 1; Langston 2012).…”

Section: Introductionmentioning

confidence: 99%

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Genetic population structure of introduced and native lineages of kokanee in a large impounded watershed

Breault,

Wetklo,

Langston

et al. 2023

Trans Am Fish Soc

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Kokanee, the non‐anadromous life‐history form of Oncorhynchus nerka, use lacustrine habitat in watersheds draining into the north Pacific Ocean. Kokanee also have been widely introduced into reservoirs following impoundment of rivers consequent to the construction of hydroelectric dams. Genetically divergent subpopulations of Kokanee should be identified and evaluated when implementing watershed‐level fishery management strategies. We analyzed the genetic population structure of Kokanee in the Williston watershed, north‐central British Columbia, where native populations were present in the reservoir and headwater lakes prior to stocking Columbia River‐origin fish in the 1990s. Using microsatellite markers, we determined that native Williston Reservoir Kokanee were divergent from only one of the headwater lake populations. Native populations in headwater lakes remain entirely separate from the reservoir populations, and there was no indication of past or current introgression with the introduced stock. We identified all fish collected from 2006 to 2019 as introduced Columbia River‐origin genotypes, and there was no evidence of genetic divergence by spawning location. As native Williston Kokanee have not been sampled from the reservoir in survey efforts since 2000, it is likely that this population has been extirpated from the reservoir perhaps through competition with the introduced Columbia River‐origin lineage.

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Section: Discussionmentioning

confidence: 99%

Section: Impact Statementmentioning

confidence: 99%