Variability of surface and underwater nocturnal spectral irradiance with the presence of clouds in urban and peri-urban wetlands

Jean Secondi; Valentin Dupont; Aurélie Davranche; Nathalie Mondy; Thierry Lengagne; Marc Thery

Variability of surface and underwater nocturnal spectral irradiance with the presence of clouds in urban and peri-urban wetlands

Jean Secondi ^{1, 2, 3} Valentin Dupont ² Aurélie Davranche ⁴ Nathalie Mondy ¹ Thierry Lengagne ¹ Marc Thery ⁵

1 LEHNA - Laboratoire d'Ecologie des Hydrosystèmes Naturels et Anthropisés

2 GECCO - Groupe Ecologie et Conservation des Vertébrés

4 LETG-ANGERS - Littoral, Environnement, Télédétection, Géomatique - Laboratoire d’Etudes Environnementales des Systèmes Anthropisés

LETG - Littoral, Environnement, Télédétection, Géomatique UMR 6554

5 MAOAC - Mécanismes adaptatifs : des organismes aux communautés

Abstract : Artificial light at night (ALAN) is an increasing phenomenon worldwide. It causes a wealth of biological and ecological effects that may eventually affect populations and ecosystems. Despite the growing concern about ALAN, little is known about the light levels species are exposed to at night, especially for wetlands and underwater habitats. We determined noctur- nal irradiance in urban and peri-urban wetlands above and under water, and assessed the effect of cloud cover on the variability of ALAN across the urban gradient. Even in aquatic habitats, cloud cover could increase irradiance beyond values observed during clear full moon nights. We report a negative relationship between baseline irradiance and the increase in irradiance during overcast nights. According to this result and previous studies, we propose that the change in the variation regime of ALAN between the urban center and rural land at its periphery is a usual feature. We discuss the ecological and evolutionary implications of this spatial variation in the urban and peri-urban environment.

Document type :

Journal articles

Domain :

Environmental Sciences / Biodiversity and Ecology

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https://hal-sde.archives-ouvertes.fr/hal-01643179
Contributor : Nathalie Lyvet <>
Submitted on : Tuesday, November 21, 2017 - 10:51:29 AM
Last modification on : Thursday, July 11, 2019 - 2:10:08 PM

Variability of surface and underwater nocturnal spectral irradiance with the presence of clouds in urban and peri-urban wetlands

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Variability of surface and underwater nocturnal spectral irradiance with the presence of clouds in urban and peri-urban wetlands

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