Evidence for episodic acidification effects on migrating Atlantic salmon <i>Salmo salar</i> smolts

Kelly, John; Lerner, Darren T.; O’Dea, Michael F.; Regish, Amy M.; Monette, Michelle Y.; Hawkes, James P.; Nislow, Keith H.; McCormick, Stephen D.

doi:10.1111/jfb.12763

Cited by 3 publications

(1 citation statement)

References 26 publications

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“…The levels of SW tolerance (plasma chloride levels after 24 h exposure to 35 ppt SW) and gill NKA activity are similar in magnitude to what has been observed in a number of other studies of different populations of anadromous Atlantic salmon in mainland North America 19–21 . Peak levels of gill NKA activity of 6 anadromous populations varied between 8 and 12 μmol ADP mg protein −1 h −1 , similar to what was observed for the Connecticut River populations in this study and higher than those achieved in the landlocked Sebago strain.…”

Section: Discussionsupporting

confidence: 81%

The evolutionary consequences for seawater performance and its hormonal control when anadromous Atlantic salmon become landlocked

McCormick

Regish

Ardren

et al. 2019

Sci Rep

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Populations of anadromous fish have become landlocked in relatively recent geological history (<14,000 years), but the evolutionary impacts of this altered lifecycle on traits underlying seawater performance have not been established. In order to examine the effects of relaxed selection on seawater traits, anadromous and landlocked Atlantic salmon were reared under identical conditions and examined for differences in seawater performance and its underlying physiological and endocrine control during the time of spring downstream migration. Salinity tolerance, survival and initial growth in seawater were greater in anadromous than in landlocked salmon. Abundance of the seawater isoform of gill Na+/K+-ATPase increased in spring in both strains but was greater in anadromous salmon. Hormones associated with seawater acclimation (adrenocorticotropic hormone, cortisol and growth hormone) increased in spring in both strains but were higher in anadromous salmon, whereas plasma thyroid hormones did not differ. Hypothalamic urotensin I mRNA levels also increased in spring and were higher in the anadromous strain. The results provide evidence that salinity tolerance and associated physiological traits are regulated by seasonal stimulation of the hypothalamic-pituitary-interrenal axis, and that relaxed selection on seawater entry traits has decreased this stimulation in landlocked salmon.

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Section: Discussionsupporting

confidence: 81%

The evolutionary consequences for seawater performance and its hormonal control when anadromous Atlantic salmon become landlocked

McCormick

Regish

Ardren

et al. 2019

Sci Rep

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Evaluating acid-aluminum stress in streams of the Northeastern U.S. at watershed, fish community and physiological scales

Zdasiuk

Chen²,

McCormick³

et al. 2022

Ecological Indicators

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Atlantic salmon (Salmo salar) smolt and early post-smolt migration and survival inferred from multi-year and multi-stock acoustic telemetry studies in the Gulf of St. Lawrence, northwest Atlantic

Chaput

Carr²,

Daniels³

et al. 2018

ICES Journal of Marine Science

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The migration dynamics and inter-annual variation in early at-sea survival of Atlantic salmon (Salmo salar) smolts over 14 years of study are reported for four river populations located in the Gulf of St. Lawrence (Canada). Acoustically tagged smolts were monitored at three points along their migration from freshwater to the Labrador Sea, a migration extending more than 800 km at sea and a period of 2 months. A hierarchical state-space version of the Cormack–Jolly–Seber model was used to estimate apparent survival rates from incomplete acoustic detections at key points. There was a positive size-dependent probability of survival through the freshwater and estuary areas; the odds of survival of a 16 cm smolt were 1.5–1.7 times higher than for a 13.5 cm smolt, length at tagging. Length adjusted (centred to the mean fork length of smolts during the study of 14.6 cm) survivals through the estuary and nearshore waters were estimated to range between 67 and 90% for the two river populations migrating through Chaleur Bay in contrast to lower survival estimates of 28–82% for the two populations from the neighbouring Miramichi Bay. Across the 14 years of study, survival estimates varied without trend for the populations of Chaleur Bay, but declined for the populations migrating through Miramichi Bay. Survival through the Gulf of St. Lawrence was variable but generally high among years and rivers, ranging from 96% day−1 to 99% day−1. Long term, replicated studies at multiple sites using acoustically tagged smolts can provide empirical data to examine hypotheses of the location and timing of factors contributing to smolt and post-smolt mortality of salmon at sea.

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Evidence for episodic acidification effects on migrating Atlantic salmon Salmo salar smolts

Cited by 3 publications

References 26 publications

The evolutionary consequences for seawater performance and its hormonal control when anadromous Atlantic salmon become landlocked

The evolutionary consequences for seawater performance and its hormonal control when anadromous Atlantic salmon become landlocked

Evaluating acid-aluminum stress in streams of the Northeastern U.S. at watershed, fish community and physiological scales

Atlantic salmon (Salmo salar) smolt and early post-smolt migration and survival inferred from multi-year and multi-stock acoustic telemetry studies in the Gulf of St. Lawrence, northwest Atlantic

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