Variability in migration timing of adult Pacific lamprey (Lampetra tridentata) in the Columbia River, U.S.A.

Abstract

We examined the effects of river environment on the timing of spawning migrations by anadromous Pacific lamprey, Lampetra tridentata, in the Columbia River (U.S.A.). In a 41-year time series of adult lamprey counts, migration timing was earliest in warm, low-discharge years and latest in cold, highflow years. Threshold temperatures associated with run timing were similar throughout the dataset despite significant impoundment-related warming, suggesting that temperature-dependent migration cues have been temporally stable. Within each year, migration rates of PIT-tagged lampreys were positively correlated with temperature and negatively correlated with discharge through multiple river reaches, offering additional evidence for environmental control of upstream movement. Both visual count and PIT-tag data indicated that there may be population-based differences in migration timing within the aggregate Columbia River lamprey run. These life history and behavioral results have potentially farreaching implications for management of lamprey species.

Some reproductive characteristics of endangered Caspian Lamprey (Caspiomyzon wagneri Kessler, 1870) in the Shirud River southern Caspian Sea, Iran

“…Similar results have been reported by Keefer et al (2009) for the adult Pacific Lamprey (Lampetra tridentata) in the Columbia River. In the Volga and Kura Rivers, migration is stimulated by decreasing temperature and increasing water level (Holčík 1986).…”

“…2). To estimate potential migration timing thresholds, we assessed cumulative lamprey passage distributions in relation to water temperature using 1°C increments (Keefer et al 2009). …”

Pre-spawning migration of adult Pacific lamprey, Entosphenus tridentatus, in the Willamette River, Oregon, U.S.A.

“…River temperature correlates strongly with the migration timing of adult sea lamprey, Petromyzon marinus, in tributaries to Lake Ontario ) and also in adult Pacific lamprey in the Columbia River Basin (Keefer et al 2009). Over multiple years in the Columbia River Basin, counts of adult Pacific lamprey at dams indicate that migration occurred earlier in the spring and summer during warm, low discharge years and later during cool, high discharge years.…”

“…Over multiple years in the Columbia River Basin, counts of adult Pacific lamprey at dams indicate that migration occurred earlier in the spring and summer during warm, low discharge years and later during cool, high discharge years. Most adult Pacific lamprey passed Bonneville Dam, the first dam encountered by these fish at river kilometer 223 on the Columbia River, at temperatures of 15-23°C (Keefer et al 2009). Similarly, peak passage of adult Pacific lamprey at Willamette Falls occurred during peak river temperatures of 23°C during 2005 (Mesa et al 2010).…”

A Meta-analysis of Greater Sage-grouse Centrocercus urophasianus Nesting and Brood-rearing Habitats

“…Temperature has been documented to be a significant cue for migration in a variety of taxa (e.g., Bauer et al 2008, Keefer et al 2009, Monteith et al 2011, as well as a cue for other avian activities (e.g., Gienapp et al 2005, Visser et al 2009). We expected a greater influence from those variables (savi, sslo) directly representing plant phenology as sage-grouse are presumed to change seasonal ranges because of growth and senescence of plants, at least for the spring and summer transitions (Fischer et al 1996).…”