The Persistence and Characteristics of Chinook Salmon Migrations to the Upper Klamath River Prior to Exclusion by Dams

Hamilton, John; Rondorf, D.W.; Tinniswood, William; Leary, Ryan J.; Mayer, Tim; Gavette, Charleen; Casal, Lynne A.

doi:10.1353/ohq.2016.0029

Cited by 4 publications

(2 citation statements)

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“…The basin is predominantly warm in summer (relative to the broader range of redband trout), but scattered with patches of perennially cool water due to the region's porous geology and numerous groundwater features (Gannett et al, 2007). Six dams fragmented the Klamath River beginning in 1918 (Hamilton et al, 2016), including J.C. Boyle Dam, which was built just upstream of the largest known groundwater spring complex in the mainstem river (Figure 1). The 8-km segment of flowing river above the dam, known as the Keno Reach, exhibits some of the hottest temperatures in the basin (>25 C; PacifiCorp, 2013) yet still supports redband trout.…”

Section: Study Settingmentioning

confidence: 99%

Habitat fragmentation drives divergent survival strategies of a cold‐water fish in a warm landscape

et al. 2023

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Climate change is a global phenomenon, but natural selection occurs within landscapes. Many global analyses predict how climate change will shape behavior and physiology, but few incorporate information from the landscape scales at which animals actually respond to selective pressure. We compared cold‐water fish (redband trout Oncorhynchus mykiss newberrii) from neighboring habitats in a naturally warm, recently fragmented basin to understand how different responses to warming may arise from landscape constraints. Trout in warm, hydrologically connected Upper Klamath Lake fled summer temperatures and sought refuge in cool tributaries, while trout in an equally warm but fragmented reach of the Klamath River endured summer conditions. Trout in the river were more physiologically tolerant of high temperatures than trout in the lake across multiple metrics, including capacity for aerobic activity, recovery from exertion, and loss of equilibrium. Two independent metrics of energetic condition indicated that the behavioral strategy of trout in the lake came at a substantial energetic cost, while the physiological strategy of trout in the river was able to mitigate most energetic consequences of high temperatures. No clear genetic basis for increased tolerance was found in trout from the river, which may suggest tolerance was derived from plasticity, although our analysis could not rule out genetic adaptation. Our results show that landscape processes such as fragmentation can cause different climate survival strategies to emerge in neighboring populations. Connecting the mechanisms that favor similar survival strategies among related organisms at broad scales with mechanisms that drive landscape‐scale variability within taxa should be a major goal for future predictions of biological responses to climate change.

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Section: Study Settingmentioning

confidence: 99%

Habitat fragmentation drives divergent survival strategies of a cold‐water fish in a warm landscape

et al. 2023

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“…Much of the recent progress comes from studies conducted in the Klamath River Oregon/California, USA, where this parasite is considered a primary factor affecting salmon recovery (Fujiwara et al ., 2011), and where management actions have been implemented based on data from long-term monitoring and research (Lehman et al ., 2020). Common to many major rivers in the USA, the Klamath has been divided by a series of hydropower dams for over a century (Hamilton et al ., 2016). Reconnection of the basins through dam removal is imminent (Thompson et al ., 2020) and will provide novel opportunities to study a multi-host aquatic parasite under changing environmental conditions.…”

Section: Introductionmentioning

confidence: 99%

Ceratonova shasta: a cnidarian parasite of annelids and salmonids

et al. 2022

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The myxozoan Ceratonova shasta was described from hatchery rainbow trout over 70 years ago. The parasite continues to cause severe disease in salmon and trout, and is recognized as a barrier to salmon recovery in some rivers. This review incorporates changes in our knowledge of the parasite's life cycle, taxonomy and biology and examines how this information has expanded our understanding of the interactions between C. shasta and its salmonid and annelid hosts, and how overarching environmental factors affect this host–parasite system. Development of molecular diagnostic techniques has allowed discrimination of differences in parasite genotypes, which have differing host affinities, and enabled the measurement of the spatio-temporal abundance of these different genotypes. Establishment of the C. shasta life cycle in the laboratory has enabled studies on host–parasite interactions and the availability of transcriptomic data has informed our understanding of parasite virulence factors and host defences. Together, these advances have informed the development of models and management actions to mitigate disease.

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Looking back, looking forward: Resilience and persistence in a Klamath tribal community

Connolly

Ruiz

Deur

et al. 2022

Journal of Anthropological Archaeology

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The Persistence and Characteristics of Chinook Salmon Migrations to the Upper Klamath River Prior to Exclusion by Dams

Cited by 4 publications

References 0 publications

Habitat fragmentation drives divergent survival strategies of a cold‐water fish in a warm landscape

Habitat fragmentation drives divergent survival strategies of a cold‐water fish in a warm landscape

Ceratonova shasta: a cnidarian parasite of annelids and salmonids

Looking back, looking forward: Resilience and persistence in a Klamath tribal community

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