journal article
Oct 01, 2023
Rapid hyperthyroidism-induced adaptation of salmonid fish in response to environmental pollution
Abstract
Abstract
The streams draining volcanic landscapes are often characterized by a complex series of factors that negatively affect hydrobionts and lead to declines in their populations. However, in a number of cases, a range of rapid adaptive changes ensure the resilience of hydrobiont populations. Here, we present both field and experimental data shedding light on the physiological basis of adaptation to heavy metal contamination in populations of Dolly Varden charr (Salvelinus malma) differing in duration of isolation in volcanic streams. The study reveals that isolated populations have a physiological phenotype that distinguishes them from populations inhabiting clean waters. They are characterized by a hyperthyroid status accompanied by an increased metabolic rate, elevated activity of antioxidant enzymes, decreased ionic conductivity of tissues and reduced stored energy reserves. Our experimental data reveal that hyperthyroidism is an adaptive characteristic enhancing the resistance to heavy metal contamination and shaping the evolution of these populations. The similarity of physiological, developmental and morphological changes in isolated populations suggests a common source and mechanisms underpinning this case of ‘evolutionary rescue’. Thus, populations of S. malma trapped in volcanic streams represent a genuine case of rapid endocrine-driven adaptation to changing environmental stimuli.
Abstract
Volcanic heavy metal pollution leads to severe oxidative stress in landlocked fish populations. We found that fish can rapidly develop toxicosis resistance via adaptive physiological and developmental shifts. Alterations of pituitary–thyroid axis activity underlie these adaptive transformations. Thus, neurally driven endocrine changes provide an evolutionary rescue for fish.
The streams draining volcanic landscapes are often characterized by a complex series of factors that negatively affect hydrobionts and lead to declines in their populations. However, in a number of cases, a range of rapid adaptive changes ensure the resilience of hydrobiont populations. Here, we present both field and experimental data shedding light on the physiological basis of adaptation to heavy metal contamination in populations of Dolly Varden charr (Salvelinus malma) differing in duration of isolation in volcanic streams. The study reveals that isolated populations have a physiological phenotype that distinguishes them from populations inhabiting clean waters. They are characterized by a hyperthyroid status accompanied by an increased metabolic rate, elevated activity of antioxidant enzymes, decreased ionic conductivity of tissues and reduced stored energy reserves. Our experimental data reveal that hyperthyroidism is an adaptive characteristic enhancing the resistance to heavy metal contamination and shaping the evolution of these populations. The similarity of physiological, developmental and morphological changes in isolated populations suggests a common source and mechanisms underpinning this case of ‘evolutionary rescue’. Thus, populations of S. malma trapped in volcanic streams represent a genuine case of rapid endocrine-driven adaptation to changing environmental stimuli.
Abstract
Volcanic heavy metal pollution leads to severe oxidative stress in landlocked fish populations. We found that fish can rapidly develop toxicosis resistance via adaptive physiological and developmental shifts. Alterations of pituitary–thyroid axis activity underlie these adaptive transformations. Thus, neurally driven endocrine changes provide an evolutionary rescue for fish.
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References
Details
- Published
- Oct 01, 2023
- Vol/Issue
- 36(10)
- Pages
- 1471-1483
- License
- View
Authors
Funding
Russian Science Foundation
Award: 22-24-00724
Cite This Article
Evgeny V. Esin, Elena V. Shulgina, Fedor N. Shkil (2023). Rapid hyperthyroidism-induced adaptation of salmonid fish in response to environmental pollution. Journal of Evolutionary Biology, 36(10), 1471-1483. https://doi.org/10.1111/jeb.14220
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