Exposure to Ultraviolet Radiation Induces Escape Hatching of Cisco (<i>Coregonus artedi</i>) Embryos

ABSTRACT Cisco (Otoonapii in Ojibwe; Coregonus artedi Lesueur, 1818), is a widely distributed stenothermic freshwater fish whose embryos typically incubate under ice and in the dark. We used Cisco as a model organism for testing the potential of UV‐induced escape hatching behaviour. Owing to reduced ice cover and increased water transparency in north temperate lakes, these experiments provide insights into the resilience of coregonine embryos if exposed to ultraviolet radiation (UV‐B; 280–320 nm). Eyed Cisco embryos were exposed to artificially sourced UV‐B through a series of experiments that measured the hatching rate and fitness (heart rate and pigmentation pattern) 2 days after hatching and under cold [6.6°C] and warm [8.6°C] conditions. These experiments supported an extension of the escape hatching behaviour hypothesis, whereby UV‐B exposure induced earlier (ca 30 days) and more punctuated hatching of Cisco embryos, independent of an increase in water temperature. UV‐B exposure produced more larvae with irregular pigmentation patterns and reduced heart rates (by about 20%) – both of which could be indicative of reduced fitness. UV‐induced escape hatching adusts the fundamental framework in which we characterise fish embryo resilience to increased UV‐B exposure and the potential consequences of reduced ice cover. Earlier hatching from UV‐B exposure could increase the recruitment bottleneck of these fish by reducing survivorship of the post‐hatched larvae.

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Publication Details

Journal
Freshwater Biology
Published
2025-04-29
DOI
https://doi.org/10.1111/fwb.70031
Citations
1
Primary Topic
Fish Ecology and Management Studies
Type
article
Field-Weighted Citation Impact
2.31

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Exposure to Ultraviolet Radiation Induces Escape Hatching of Cisco (Coregonus artedi) Embryos

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Exposure to Ultraviolet Radiation Induces Escape Hatching of Cisco (Coregonus artedi) Embryos

Derek L. Bahr, David B. Bunnell, Nicole L. Berry, Craig E. Williamson, Peter C. Jacobson, Gretchen J. A. Hansen, Thomas J. Fisher, Elizabeth M. Mette, Andrew Tucker, Brian C. Weidel, Tyler D. Ahrenstorff, Abigail J. Lynch, Jason B. Smith, Bruce Carlson, Casey W. Schoenebeck, Kevin M. Keeler, Erin P. Overholt, Kristopher Dey, Jennifer A. Schumacher, Addison Z. Almeda
article en
1 citations

Abstract

ABSTRACT Cisco (Otoonapii in Ojibwe; Coregonus artedi Lesueur, 1818), is a widely distributed stenothermic freshwater fish whose embryos typically incubate under ice and in the dark. We used Cisco as a model organism for testing the potential of UV‐induced escape hatching behaviour. Owing to reduced ice cover and increased water transparency in north temperate lakes, these experiments provide insights into the resilience of coregonine embryos if exposed to ultraviolet radiation (UV‐B; 280–320 nm). Eyed Cisco embryos were exposed to artificially sourced UV‐B through a series of experiments that measured the hatching rate and fitness (heart rate and pigmentation pattern) 2 days after hatching and under cold [6.6°C] and warm [8.6°C] conditions. These experiments supported an extension of the escape hatching behaviour hypothesis, whereby UV‐B exposure induced earlier (ca 30 days) and more punctuated hatching of Cisco embryos, independent of an increase in water temperature. UV‐B exposure produced more larvae with irregular pigmentation patterns and reduced heart rates (by about 20%) – both of which could be indicative of reduced fitness. UV‐induced escape hatching adusts the fundamental framework in which we characterise fish embryo resilience to increased UV‐B exposure and the potential consequences of reduced ice cover. Earlier hatching from UV‐B exposure could increase the recruitment bottleneck of these fish by reducing survivorship of the post‐hatched larvae.

Freshwater BiologyVol. 70(5)
The Nature Conservancy (US), United States Geological Survey (US), University of Minnesota (US), Minnesota Department of Natural Resources (US), Great Lakes Science Center (US), Great Lakes Environmental Center (US), Chippewa County Health Department (US), Climate Adaptation Science Centers (US), Miami University (US)
U.S. Geological Survey
Clean water and sanitation
Openalex Percentile: Top 15%
Fish Ecology and Management Studies
2.31
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