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Quintanilla-Ahumada D, Quijón PA, Manríquez PH, Pulgar J, García-Huidobro MR, Miranda C, Molina A, Zuloaga R, Duarte C. Artificial light at night (ALAN) causes variable dose-responses in a sandy beach isopod. Environ Sci Pollut Res Int 2022; 29:35977-35985. [PMID: 35060027 DOI: 10.1007/s11356-021-17344-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/01/2021] [Accepted: 10/29/2021] [Indexed: 06/14/2023]
Abstract
Artificial Light at Night (ALAN) is expanding worldwide, and the study of its influence remains limited mainly to documenting impacts, overlooking the variation in key characteristics of the artificial light such as its intensity. The potential dose-response of fitness-related traits to different light intensities has not been assessed in sandy beach organisms. Hence, this study explored dose-responses to ALAN by exposing the intertidal sandy beach isopod Tylos spinulosus to a range of light intensities at night: 0 (control), 20, 40, 60, 80 and 100 lx. We quantified the response of this species at the molecular (RNA:DNA ratios), physiological (absorption efficiency) and organismal (growth rate) levels. Linear and non-linear regressions were used to explore the relationship between light intensity and the isopod response. The regressions showed that increasing light intensity caused an overall ~ threefold decline in RNA:DNA ratios and a ~ threefold increase in absorption efficiency, with strong dose-dependent effects. For both response variables, non-linear regressions also identified likely thresholds at 80 lx (RNA:DNA) and 40 lx (absorption efficiency). By contrast, isopod growth rates were unrelated (unaltered) by the increase in light intensity at night. We suggest that ALAN is detrimental for the condition of the isopods, likely by reducing the activity and feeding of these nocturnal organisms, and that the isopods compensate this by absorbing nutrients more efficiently in order to maintain growth levels.
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Affiliation(s)
| | - Pedro A Quijón
- Department of Biology, University of Prince Edward Island, Charlottetown, PE, Canada
| | - Patricio H Manríquez
- Centro de Estudios Avanzados en Zonas Áridas (CEAZA), Coquimbo, Chile
- Laboratorio de Ecología y Conducta de La Ontogenia Temprana (LECOT), Coquimbo, Chile
| | - José Pulgar
- Departamento de Ecología y Biodiversidad, Facultad de Ciencias de la Vida, Universidad Andres Bello, Santiago, Chile
- Centro de Investigación Marina Quintay (CIMARQ), Facultad de Ciencias de la Vida, Universidad Andres Bello, Santiago, Chile
| | - Manuel R García-Huidobro
- Centro de Investigación e Innovación para el Cambio Climático, Facultad de Ciencias, Universidad Santo Tomás, Ejército 146, Santiago, Chile
| | - Cristian Miranda
- Programa de Doctorado en Medicina de la Conservación, Universidad Andres Bello, Santiago, Chile
| | - Alfredo Molina
- Laboratorio de Biotecnología Molecular, Universidad Andres Bello, Facultad de Ciencias de la Vida, 8370146, Santiago, Chile
| | - Rodrigo Zuloaga
- Laboratorio de Biotecnología Molecular, Universidad Andres Bello, Facultad de Ciencias de la Vida, 8370146, Santiago, Chile
| | - Cristian Duarte
- Departamento de Ecología y Biodiversidad, Facultad de Ciencias de la Vida, Universidad Andres Bello, Santiago, Chile.
- Centro de Investigación Marina Quintay (CIMARQ), Facultad de Ciencias de la Vida, Universidad Andres Bello, Santiago, Chile.
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