The effects of fluctuating temperature regimes on the embryonic development of lake whitefish (Coregonus clupeaformis)

Lim, Michael Y.-T.; Manzon, Richard G.; Somers, Christopher M.; Boreham, Douglas R.; Wilson, Joanna Y.

doi:10.1016/j.cbpa.2017.08.010

Cited by 24 publications

(50 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Because the average temperature for the seasonal regimes dropped between 2 and 5 °C at later development stages, the number of dpf needed to reach the protruding mouth stage was approximately intermediate relative to embryos reared at constant 2 and 5 °C (Table ). This was very similar to the effects of seasonal temperatures on lake whitefish (Lim et al ). Both lake and round whitefish embryos from constant temperature regimes had delayed median hatch, likely caused by the lack of warming periods near the end of development (Patrick et al ; Thome et al ; Lim et al ; present study).…”

Section: Discussionsupporting

confidence: 86%

“…The effects of constant elevated temperature during round whitefish embryogenesis were similar to those found in previous studies on the sympatric lake whitefish. Elevated incubation temperature resulted in increased total prehatch mortality, decreased body size, and larger yolks at hatch both for round whitefish embryos (Griffiths ; present study), and in the many studies on lake whitefish embryos (Price ; Brooke ; Mueller et al ; Lim et al ).…”

Section: Discussionsupporting

confidence: 60%

“…This finding may reflect an increased allocation of energy stores toward growth in embryos from 2015 compared with those from 2014. Regardless of these differences, mortality was significantly higher for round whitefish embryos reared at 8 °C compared with lake whitefish embryos (Supplemental Data, Figure S12; Lim et al ), despite identical rearing conditions, supporting the idea that round whitefish embryos are indeed more thermally sensitive, with a lower thermal maximum, than lake whitefish embryos.…”

Section: Discussionmentioning

confidence: 67%

“…Although some research has been conducted on embryonic development with different temperature regimes (Griffiths ), to our knowledge, our study is the first to examine the potential effects on round whitefish embryos of other once‐through cooling discharge stressors including morpholine and radiation exposure. The different incubation temperature regimes, and the magnitudes of morpholine and irradiation used in this experiment, allowed for a comparison with recent studies on lake whitefish (Lim et al ; Thome et al , ). Relative to unexposed round whitefish embryos, we observed increased prehatch mortality, reduced growth, and reduced yolk consumption for embryos reared with constant exposure to thermal and morpholine stressors, with an increase in posthatch mortality for surviving larvae.…”

Section: Discussionmentioning

confidence: 97%

“…Once fertilized, embryos were placed in lake water, disinfected with Ovadine (0.5% iodine) for 30 min, and rinsed several times with additional lake water. Using methods that have been previously developed (Eme et al ; Mueller et al ; Lim et al ), cleaned embryos were transported on ice to McMaster University (Hamilton, ON, Canada) in containers of approximately 50% embryos, 50% fresh lake water. Once at McMaster University, embryos were disinfected again with Ovadine and dechlorinated city water at 5 °C.…”

Section: Methodsmentioning

confidence: 99%

See 4 more Smart Citations

Impacts of temperature, morpholine, and chronic radiation on the embryonic development of round whitefish (Prosopium cylindraceum)

Lim

Manzon

Somers

et al. 2018

Enviro Toxic and Chemistry

Self Cite

View full text Add to dashboard Cite

During incubation, round whitefish embryos may experience fluctuating or elevated temperatures from natural (e.g., seasonal temperature changes) and/or anthropogenic sources. Anthropogenic sources like once-through cooling discharges from nuclear power plants can also expose embryos to chemicals (e.g., morpholine) and/or radiation. To examine the effects of these potential stressors on embryogenesis, round whitefish were incubated under fluctuating or constant temperatures, with morpholine or Cs gamma rays. We report the percentage of prehatch and posthatch mortality, developmental rate, hatch dynamics, and morphometrics at 4 development stages. Embryos reared at constant temperatures had delayed developmental stage onset and median hatch, higher mortality at constant 8 °C, and lower mortality at ≤5 °C, compared with embryos reared under seasonal temperature regimes. Embryos incubated with ≥500 mg L morpholine (>200× regulatory limits) had advanced hatch, reduced body size, and increased prehatch (100% at 1000 mg L ) and posthatch (≈95% at 500 mg L ) mortality compared with controls. Relative to controls, embryos irradiated with ≥0.16 mGy/d had larger body mass early in development, and all irradiated embryos had decreased posthatch mortality; the lowest dose was >300× discharge limits. Our study suggests that fluctuating or elevated temperatures and high-dose morpholine can alter development rate, hatch dynamics, and growth, and/or increase mortality compared with embryos reared at constant temperatures of ≤5 °C; conversely, low-dose irradiation had transient developmental effects but may benefit early posthatch survival. Environ Toxicol Chem 2018;37:2593-2608. © 2018 SETAC.

show abstract

Section: Discussionsupporting

confidence: 86%

Section: Discussionsupporting

confidence: 60%

Section: Discussionmentioning

confidence: 67%

Section: Discussionmentioning

confidence: 97%

Section: Methodsmentioning

confidence: 99%

See 3 more Smart Citations

Impacts of temperature, morpholine, and chronic radiation on the embryonic development of round whitefish (Prosopium cylindraceum)

Lim

Manzon

Somers

et al. 2018

Enviro Toxic and Chemistry

Self Cite

View full text Add to dashboard Cite

show abstract

Thermal variability during ectotherm egg incubation: A synthesis and framework

Massey

Hutchings

2020

J Exp Zool Pt A

View full text Add to dashboard Cite

Natural populations of ectothermic oviparous vertebrates typically experience thermal variability in their incubation environment. Yet an overwhelming number of laboratory studies incubate animals under constant thermal conditions that cannot capture natural thermal variability. Here, we systematically searched for studies that incubated eggs of ectothermic vertebrates, including both fishes and herpetofauna, under thermally variable regimes. We ultimately developed a compendium of 66 studies that used thermally variable conditions for egg incubation. In this review, we qualitatively discuss key findings from literature in the compendium, including the phenotypic effects resulting from different patterns of thermally variable incubation, as well as the ontogenetic persistence of these effects. We also describe a physiological framework for contextualizing some of these effects, based on thermal performance theory. Lastly, we highlight key gaps in our understanding of thermally variable incubation and offer suggestions for future studies.

show abstract

Effects of Temperature Fluctuation on Burbot Embryos: Implications of Hydropower and Climate Change

et al. 2021

View full text Add to dashboard Cite

Populations of Burbot Lota lota across the Holarctic ecozone are facing imperilment from environmental warming, particularly in ecosystems impacted by hydropower and climate change. We conducted a series of laboratory experiments to evaluate the tolerance of Burbot embryos to various thermal regimes. Both cyclical and constant warming between 4.0°C and 5.5°C during the initial 25 degree-days of embryo development led to significant deformity and mortality of protolarvae, with faster rates of temperature increase (i.e., 0.4°C/d) causing greater harm than gradual rates of warming. Random family effects interacted with incubation temperature of embryos to account for significant variability in deformity and survival of protolarvae. These findings have management implications for identifying and/ or augmenting the thermal fitness of populations in modified ecosystems, particularly in Burbot populations where aquaculture production supports abundance. A model of hatching time based on degree-days of embryo development was also developed to improve predictions of natural emergence, peak larvae abundance, and optimal timing for larvae stocking. It is recommended that hydropower operations avoid thermopeaking during winter spawning of Burbot, especially if reservoir discharges exceed 4°C. Maintaining water temperatures below 3°C for at least the first 2 weeks of embryogenesis is critical for Burbot reproduction and underscores the importance of ice-covered spawning habitats. Global climate trends are expected to exacerbate warming in rivers, and many challenges lie ahead for conservation efforts seeking to mitigate the risks of Burbot extirpation.

show abstract

The effects of fluctuating temperature regimes on the embryonic development of lake whitefish (Coregonus clupeaformis)

Cited by 24 publications

References 29 publications

Impacts of temperature, morpholine, and chronic radiation on the embryonic development of round whitefish (Prosopium cylindraceum)

Impacts of temperature, morpholine, and chronic radiation on the embryonic development of round whitefish (Prosopium cylindraceum)

Thermal variability during ectotherm egg incubation: A synthesis and framework

Effects of Temperature Fluctuation on Burbot Embryos: Implications of Hydropower and Climate Change

Contact Info

Product

Resources

About