Temporal genetic population structure and interannual variation in migration behavior of Pacific Lamprey Entosphenus tridentatus

Clemens, Benjamin J.; Wyss, Lance A.; McCoun, Rebecca; Courter, Ian I.; Schwabe, Lawrence; Peery, Christopher A.; Schreck, Carl B.; Spice, Erin K.; Docker, Margaret F.

doi:10.1007/s10750-017-3096-4

Cited by 14 publications

(10 citation statements)

References 62 publications

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“…Studies of neutral genetic loci in Pacific lamprey suggest the species is geographically structured, including three genetic groups: northern British Columbia, U.S. West Coast (including the Columbia River) and “dwarf” adults (Goodman, Reid, Docker, Hass, & Kinziger, ; Hess et al, ; Spice, Goodman, Reid, & Docker, ). One study has resolved evidence of inter‐ and intra‐annual temporal genetic structure in Pacific lamprey in the Willamette River, Oregon (Clemens et al, ).…”

Section: Introductionmentioning

confidence: 99%

Evidence for the genetic basis and epistatic interactions underlying ocean‐ and river‐maturing ecotypes of Pacific Lamprey (Entosphenus tridentatus) returning to the Klamath River, California

et al. 2019

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Surveys of genomic variation have improved our understanding of the relationship between fitness‐related phenotypes and their underlying genetic basis. In some cases, single large‐effect genes have been found to underlie important traits; however, complex traits are expected to be under polygenic control and elucidation of multiple gene interactions may be required to fully understand the genetic basis of the trait. In this study, we investigated the genetic basis of the ocean‐ and river‐maturing ecotypes in anadromous Pacific lamprey (Entosphenus tridentatus). In Pacific lamprey, the ocean‐maturing ecotype is distinguished by advanced maturity of females (e.g., large egg mass) at the onset of freshwater migration relative to immature females of the river‐maturing ecotype. We examined a total of 219 adult Pacific lamprey that were collected at‐entry to the Klamath River over a 12‐month period. Each individual was genotyped at 308 SNPs representing known neutral and adaptive loci and measured at morphological traits, including egg mass as an indicator of ocean‐ and river‐maturing ecotype for females. The two ecotypes did not exhibit genetic structure at 148 neutral loci, indicating that ecotypic diversity exists within a single population. In contrast, we identified the genetic basis of maturation ecotypes in Pacific lamprey as polygenic, involving two unlinked gene regions that have a complex epistatic relationship. Importantly, these gene regions appear to show stronger effects when considered in gene interaction models than if just considered additive, illustrating the importance of considering epistatic effects and gene networks when researching the genetic basis of complex traits in Pacific lamprey and other species.

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Section: Introductionmentioning

confidence: 99%

Evidence for the genetic basis and epistatic interactions underlying ocean‐ and river‐maturing ecotypes of Pacific Lamprey (Entosphenus tridentatus) returning to the Klamath River, California

et al. 2019

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“…; Clemens et al. 2017b), before entering unmonitored tributaries. Monitoring was especially limited downstream from the Bonneville tailrace, and we expect that some of the fish that were never detected after release, as well as some with uncertain fates, may have entered downstream tributaries.…”

Section: Discussionmentioning

confidence: 99%

Rapid Migration and High Survival of Adult Pacific Lampreys in Reservoirs

Keefer

Noyes

Clabough

et al. 2020

N American J Fish Manag

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Dams and reservoirs present diverse hazards for riverine fishes, including slowed migration, reduced or blocked access to essential habitats, and direct and delayed mortality risks. Many of these hazards are evident for Pacific Lamprey Entosphenus tridentatus in the heavily dammed Columbia River basin, where the species’ distribution and abundance has sharply declined. In a 3‐year study, we used acoustic telemetry to investigate behavior and apparent survival of 784 adult Pacific Lampreys in Columbia River reservoirs and turbulent dam tailraces, two environments where previous monitoring efforts have been somewhat ineffectual. We released Pacific Lampreys upstream and downstream from Bonneville Dam to test whether Pacific Lamprey passage at one dam negatively affected upstream dam and reservoir passage metrics (i.e., delayed effects on migration rate or reach passage success) and whether upstream‐released groups migrated further than their downstream‐released counterparts. Overall, results showed that Pacific Lampreys migrated very rapidly (median rates = 50–62 km/d) in reservoir reaches and slowly (1–3 km/d) in reaches with tailraces or fishways. Pacific Lampreys also had much higher passage success in reservoir reaches (reach × year estimates = 0.93–0.99) than in reaches with tailraces or fishways (most estimates = 0.58–0.82). We found little statistical evidence for negative delayed effects of dam passage. Pacific Lampreys released in the Bonneville forebay were far more likely to pass upstream dams (~26–57%) than were those released in the Bonneville tailrace (~20–36%). We conclude that tailraces and fishways constrained the upstream distribution of adult Pacific Lampreys, that reservoirs were not associated with high mortality during active upstream migration, and that translocation past individual dams can increase the upstream migration distance of individuals and population distribution. Areas of continuing uncertainty include behavior and survival during overwintering (i.e., prespawn holding) and the potential delayed effects of tailrace and fishway passage on Pacific Lamprey fitness.

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“…During the late 1800s and early 1900s, the Willamette River basin was unimpounded and exhibited a higher and more variable flow regime of clean, cool water. Relatively high river flows correlate with greater movement of lamprey upstream in the basin (Clemens et al 2017b;Clemens and Schreck 2021) and within tributaries (e.g., Clemens et al 2023), whereas lower, warmer flows are not conducive to facilitating continued upstream migration by lamprey (Clemens et al 2016). The main-stem Willamette River was also more sinuous, with a complex channel, off-channel aquatic habitats, and abundant large wood that would have influenced channel morphology, flow, and microclimates, thereby creating a buffer for water temperatures (IMST 2000).…”

Section: Lamprey Habitat Needsmentioning

confidence: 99%

The case for basinwide passage and habitat restoration for Pacific Lamprey in the Willamette River basin (Oregon, USA)

Clemens

Friesen

Gregory

et al. 2023

N American J Fish Manag

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Pacific Lamprey (Entosphenus tridentatus) is an anadromous fish that provides many ecosystem services and is important to Native American tribes who harvest them for cultural uses. The largest harvest of adult Pacific Lamprey in North America occurs at Willamette Falls (“WF”; Oregon, USA). Lamprey have experienced conservation problems for decades and harvest numbers at WF have plummeted ~33‐fold, from a maximum of >500,000 during 1946 to an average of ~16,000 per year during 1969 – 1999. Recent harvest has dropped to <6,000 lamprey per year during 2000 – 2021. However, existing conservation plans do not provide a historical perspective on the lamprey harvest at WF and the cumulative threats to them in the Willamette basin that likely caused harvest reductions. Land development, river impoundment, and water pollution coincided with significant decreases in lamprey harvest at WF. These (and other) threats have resulted in reduced habitat for larval lamprey in the basin, and thus a reduction in the pheromones they release (which attract adults). Conservation plans do not identify specific, basin‐wide goals to increase the number of lamprey in general and to provide more lamprey for harvest in particular. Therefore, in this review paper we provide a conservation perspective on three topics to increase and monitor lamprey abundance at WF. We (1) provide an up‐to‐date history of the lamprey harvest and its regulation at WF, (2) recommend addressing the lack of basin‐wide, lamprey‐specific passage and habitat restoration to improve the quantity and quality of lamprey spawning and rearing habitats, and (3) identify research needs for monitoring the population(s) of lamprey at WF. We conclude that lamprey‐specific passage and habitat restoration throughout the Willamette basin above WF is necessary to bolster abundance.

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Temporal genetic population structure and interannual variation in migration behavior of Pacific Lamprey Entosphenus tridentatus

Cited by 14 publications

References 62 publications

Evidence for the genetic basis and epistatic interactions underlying ocean‐ and river‐maturing ecotypes of Pacific Lamprey (Entosphenus tridentatus) returning to the Klamath River, California

Evidence for the genetic basis and epistatic interactions underlying ocean‐ and river‐maturing ecotypes of Pacific Lamprey (Entosphenus tridentatus) returning to the Klamath River, California

Rapid Migration and High Survival of Adult Pacific Lampreys in Reservoirs

The case for basinwide passage and habitat restoration for Pacific Lamprey in the Willamette River basin (Oregon, USA)

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