Circadian Rhythms of Retinomotor Movement in a Marine Megapredator, the Atlantic Tarpon, Megalops atlanticus
| Autor: | Kristin L. Kopperud, Michael S. Grace |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
0301 basic medicine
circadian rhythm Time Factors Light genetic structures Photoperiod Circadian clock Catalysis Retina Article Inorganic Chemistry lcsh:Chemistry 03 medical and health sciences retinomotor movement Animals Marine ecosystem Circadian rhythm Physical and Theoretical Chemistry Molecular Biology lcsh:QH301-705.5 Spectroscopy photoperiodism Tarpon biology Ecology Organic Chemistry Fishes photoreceptors General Medicine Environmental exposure Environmental Exposure biology.organism_classification Photoreceptor outer segment Computer Science Applications 030104 developmental biology Megalops atlanticus lcsh:Biology (General) lcsh:QD1-999 sense organs Photoreceptor Cells Vertebrate |
| Zdroj: | International Journal of Molecular Sciences; Volume 18; Issue 10; Pages: 2068 International Journal of Molecular Sciences International Journal of Molecular Sciences, Vol 18, Iss 10, p 2068 (2017) |
| ISSN: | 1422-0067 |
| DOI: | 10.3390/ijms18102068 |
| Popis: | Many ecologically and economically important marine fish species worldwide spend portions of their lives in coastal regions that are increasingly inundated by artificial light at night. However, while extensive research illustrates the harmful effects of inappropriate light exposure on biological timing in humans, rodents and birds, comparable studies on marine fish are virtually nonexistent. This study aimed to assess the effects of light on biological clock function in the marine fish retina using the Atlantic tarpon (Megalops atlanticus) as a model. Using anti-opsin immunofluorescence, we observed robust rhythms of photoreceptor outer segment position (retinomotor movement) over the course of the daily light–dark cycle: cone outer segments were contracted toward the inner retina and rods were elongated during the day; the opposite occurred at night. Phase shifting the daily light–dark cycle caused a corresponding shift of retinomotor movement timing, and cone retinomotor movement persisted in constant darkness, indicating control by a circadian clock. Constant light abolished retinomotor movements of both photoreceptor types. Thus, abnormally-timed light exposure may disrupt normal M. atlanticus clock function and harm vision, which in turn may affect prey capture and predator avoidance. These results should help inform efforts to mitigate the effects of coastal light pollution on organisms in marine ecosystems. |
| Databáze: | OpenAIRE |
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