Univ. Bordeaux, CNRS, Bordeaux INP, EPOC, UMR 5805, F-33120 Arcachon, France.
Univ. Bordeaux, CNRS, Bordeaux INP, EPOC, UMR 5805, F-33120 Arcachon, France.
Mar Pollut Bull. 2023 Jun;191:114850. doi: 10.1016/j.marpolbul.2023.114850. Epub 2023 Apr 3.
Artificial Light At Night (ALAN) masks the natural light cycles and thus can disturb the synchronization of organisms' biological rhythms with their environment. Although coastlines are highly exposed to this growing threat, studies concerning the impacts of ALAN on coastal organisms remain scarce. In this study, we investigated the ALAN exposure effects at environmentally realistic intensities (0.1, 1, 10, 25 lx) on the oyster Crassostrea gigas, a sessile bivalve subject to light pollution on shores. We focused on the effects on oyster's daily rhythm at behavioral and molecular levels. Our results showed that ALAN disrupts the oyster's daily rhythm by increasing valve activity and annihilating day / night differences of expression of circadian clock and clock-associated genes. ALAN effects occur starting from 0.1 lx, in the range of artificial skyglow illuminances. We concluded that realistic ALAN exposure affects oysters' biological rhythm, which could lead to severe physiological and ecological consequences.
人工夜间光照（ALAN）掩盖了自然光照周期，从而可能扰乱生物与环境之间的生物节律同步性。尽管海岸线高度暴露于这种日益严重的威胁之下，但有关 ALAN 对沿海生物影响的研究仍然很少。在这项研究中，我们研究了在环境现实强度（0.1、1、10、25 lx）下，ALAN 暴露对牡蛎（Crassostrea gigas）的影响，牡蛎是一种固着双壳贝类，在岸边易受到光污染的影响。我们重点研究了 ALAN 对牡蛎在行为和分子水平上的日常节律的影响。研究结果表明，ALAN 通过增加贝壳开合活动并消除昼夜节律和生物钟相关基因表达的昼夜差异，扰乱了牡蛎的日常节律。从 0.1 lx 开始，ALAN 就会产生影响，这一范围处于人造天光照度内。我们得出结论，现实环境中的 ALAN 暴露会影响牡蛎的生物节律，从而可能导致严重的生理和生态后果。
