Fish response to environmental stressors in the Lake Victoria Basin ecoregion

Chapman, Lauren J.; Nyboer, Elizabeth A.; Fugère, Vincent

doi:10.1016/bs.fp.2022.04.010

Cited by 6 publications

(4 citation statements)

References 164 publications

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“…This study was conducted within the RSS (00.58875° N 030.37222° E) in Kibale National Park, Uganda. In this papyrus ( Cyperus papyrus ) swamp, low water flow and mixing combined with high input of organic matter and levels of shade result in low‐DO levels, averaging 0.99 mg/L between 1993 and 2019 (for DO data, see Chapman et al., 2022). However, the swamp has associated streams and river tributaries where increased flow and turbulence lead to much higher average DO levels (~6 mg/L).…”

Section: Methodsmentioning

confidence: 99%

Counter‐gradient variation in gene expression between fish populations facilitates colonization of low‐dissolved oxygen environments

Fox,

Hunt,

Hendry

et al. 2024

Molecular Ecology

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The role of phenotypic plasticity during colonization remains unclear due to the shifting importance of plasticity across timescales. In the early stages of colonization, plasticity can facilitate persistence in a novel environment; but over evolutionary time, processes such as genetic assimilation may reduce variation in plastic traits such that species with a longer evolutionary history in an environment can show lower levels of plasticity than recent invaders. Therefore, comparing species in the early stages of colonization to long‐established species provides a powerful approach for uncovering the role of phenotypic plasticity during different stages of colonization. We compared gene expression between low‐dissolved oxygen (DO) and high‐DO populations of two cyprinid fish: Enteromius apleurogramma, a species that has undergone a recent range expansion, and E. neumayeri, a long‐established native species in the same region. We sampled tissue either immediately after capture from the field or after a 2‐week acclimation under high‐DO conditions, allowing us to test for both evolved and plastic differences in low‐DO vs high‐DO populations of each species. We found that most genes showing candidate‐evolved differences in gene expression did not overlap with those showing plastic differences in gene expression. However, in the genes that did overlap, there was counter‐gradient variation such that plastic and evolved gene expression responses were in opposite directions in both species. Additionally, E. apleurogramma had higher levels of plasticity and evolved divergence in gene expression between field populations. We suggest that the higher level of plasticity and counter‐gradient variation may have allowed rapid genetic adaptation in E. apleurogramma and facilitated colonization. This study shows how counter‐gradient variation may impact the colonization of divergent oxygen environments.

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Section: Methodsmentioning

confidence: 99%

Counter‐gradient variation in gene expression between fish populations facilitates colonization of low‐dissolved oxygen environments

Fox,

Hunt,

Hendry

et al. 2024

Molecular Ecology

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“…This study was conducted within the Rwembaita Swamp system (RSS) (00.58875 °N 030.37222 °E) in Kibale National Park, Uganda. In this papyrus ( Cyperus papyrus ) swamp, low water flow and mixing combined with high input of organic matter and levels of shade result in low dissolved oxygen levels, averaging 0.99 mg/L between 1993 and 2019 (for DO data see (Chapman et al, 2022)). However, the swamp has associated streams and river tributaries where increased flow and turbulence leads to much higher average dissolved oxygen levels (∼6 mg/L).…”

Section: Methodsmentioning

confidence: 99%

“…The copyright holder for this preprint this version posted November 16, 2023. ; https://doi.org/10.1101/2023.11.14.567098 doi: bioRxiv preprint water flow and mixing combined with high input of organic matter and levels of shade result in low dissolved oxygen levels, averaging 0.99 mg/L between 1993 and 2019 (for DO data see (Chapman et al, 2022)). However, the swamp has associated streams and river tributaries where increased flow and turbulence leads to much higher average dissolved oxygen levels (~6 mg/L).…”

Section: Study Sitementioning

confidence: 99%

Counter-gradient variation in gene expression between fish populations facilitates colonization of low-dissolved oxygen environments

Fox,

Hunt,

Hendry

et al. 2023

Preprint

Self Cite

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The role of phenotypic plasticity during colonization remains unclear due to the shifting importance of plasticity across timescales. Over time, genetic responses can reduce plasticity such that species in a novel environment show higher levels of plasticity than those with a longer evolutionary timescale in the environment. Therefore, comparing species in the early stages of colonization to long-established species provides a powerful approach for uncovering the role of phenotypic plasticity during different stages of colonization. We compared gene expression between the cyprinid fishEnteromius apleurogramma, a species that has undergone a recent range expansion, andE. neumayeri, a long-established native species in the same region, caught from low-dissolved oxygen (DO) and high-DO habitats. We sampled tissue either immediately after capture from the field or after a two-week acclimation under high-DO conditions, allowing us to test for both evolved and plastic differences in low-DO vs high-DO populations of each species. We found that most genes showing evolved differences in gene expression did not overlap with those showing plastic differences in gene expression. However, in the genes that did overlap, there was counter-gradient variation such that plastic and evolved gene expression responses were in opposite directions in both species. Additionally,E. apleurogrammahad higher levels of plasticity and evolved divergence in gene expression between field populations. We suggest that the higher level of plasticity and counter-gradient variation may have allowed rapid genetic adaptation inE. apleurogrammaand facilitated colonization. This study shows how counter-gradient variation may impact colonization of divergent oxygen environments.

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“…Fish have capability to confront with fluctuation of aquatic environment such as variation in weather pattern due to temperature fluctuation (Golovanova et al, 2013;Islam et al, 2022). Adaptation of freshwater fishes in thermal fluctuation reviewed to be a key instigation of their robustness, distribution, behaviour and partially controlled by their stress physiology (Alfonso et al, 2021;Chapman et al, 2022). Population of aquatic animals is declining worldwide due to climate change i.e.…”

Section: Introductionmentioning

confidence: 99%

Effect of Temperature Fluctuation on the Indian Major Carp Labeo rohita and Cirrhinus mrigala Larvae under a Controlled Environment

Azhar

Anjum

Akhter

et al. 2022

Jammu Kashmir J. Agric.

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Major carp i.e., Rohu (Labeo rohita) and Mrigala (Cirrhinus mrigala) are economically very important and commonly cultured in Indian subcontinent. In Pakistan aquatic organisms especially, freshwater species are facing many environmental problems such as variation in weather pattern. Temperature fluctuation is pervasive and most common environmental factor that is very distressing for major carps. The larvae of Labeo rohita and Cirrhinus mrigala were treated with different temperatures 10, 15, 20, 25, 30, 33 and 35 °C following 28 °C acclimation temperature. Thermal variation rate was recorded 2 °C/day. Death rate of both species larvae was observed. In temperature group 10 °C, 15% and 64% mortality of Labeo rohita was observed while, in Cirrhinus mrigala 16% and 66% mortality was recorded at 14 and 10 °C respectively. When larvae of both species were exposed to 10-20 °C, significantly (P < 0.05) maximum death rate was observed at this temperature as compared to other experimental groups. Cumulative death rate of Labeo rohita and Cirrhinus mrigala were recorded 84, 43, 22, 16, 1, 2, 3% and 86, 45, 23, 17, 1, 2, 4% in 10, 15, 20, 25, 30, 33, 35 °C temperature groups, respectively. All larvae of both species died within 2 days at temperature group 10 °C and continued to die at temperature groups 15 °C and 20 °C up to 11 days. Both species larval mortality persisted in temperature groups at 25 °C up to 18 days. Simple regression analysis was applied for thermal range (T < 28 °C and T > 28 °C), variation in death per fall and elevation of ∆T = 1 °C was measured in the log-linear regression model framework. When water temperature dropped from acclimation temperature 28 °C, the accumulative death of larvae for 1 °C decrease of temperature from acclimation one, significantly (P < 0.05) was calculated in both species. When water temperature elevated from 28 °C, less steep beta coefficient was observed in Labeo rohita and Cirrhinus mrigala. 1 °C elevation of water temperature from acclimation temperature 28 °C, the accumulative death in Labeo rohita and Cirrhinus mrigala were (P > 0.05) obtained

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Fish response to environmental stressors in the Lake Victoria Basin ecoregion

Cited by 6 publications

References 164 publications

Counter‐gradient variation in gene expression between fish populations facilitates colonization of low‐dissolved oxygen environments

Counter‐gradient variation in gene expression between fish populations facilitates colonization of low‐dissolved oxygen environments

Counter-gradient variation in gene expression between fish populations facilitates colonization of low-dissolved oxygen environments

Effect of Temperature Fluctuation on the Indian Major Carp Labeo rohita and Cirrhinus mrigala Larvae under a Controlled Environment

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