Abstract

Tabor RA, Perkin EK, Beauchamp DA, Britt LL, Haehn R, Green J, Robinson T, Stolnack S, Lantz DW, Moore ZJ. 2021. Artificial lights with different spectra do not alter detrimental attraction of young Chinook salmon and sockeye salmon along lake shorelines. Lake Reserv Manage. 37:313–322.

Artificial light at night (ALAN) is common in lakes with developed shorelines, especially prevalent in the nearshore areas where juvenile fishes, including salmonids, are present. One concern is that fishes may be attracted to ALAN and become more vulnerable to predators. The use of longer wavelength lights has been suggested to reduce the effects of ALAN; however, the response in juvenile salmonids is not well known. We tested the hypothesis that longer wavelength lights would attract fewer subyearling Chinook salmon (Oncorhynchus tshawytscha) and sockeye salmon (O. nerka) than shorter wavelength lights. Test lights included 4 LED lights, an incandescent light, and a high-pressure sodium light (HPS). In total, 13 experimental trials were conducted in 2017 and 2018, and in total 1769 Chinook salmon and 870 sockeye salmon were collected with beach seines. The mean catch rate (number per beach seine set) of subyearling salmonids was 51.0 for lighted treatments but only 6.6 for control treatments (no light). In both years, we did not find any significant difference in catch rates for either species between either of the longer wavelength lights (red-filter and yellow-filter LED lights) and other lights, and thus we rejected the hypothesis that longer wavelength light would attract fewer subyearling salmonids. For these early life stages of salmon in shallow shoreline habitats, reducing the intensity of light present is likely more important than altering the spectral composition when trying to minimize maladaptive attraction to ALAN.

摘要

Tabor RA、Perkin EK、Beauchamp DA、Britt LL、Haehn R、Green J、Robinson T、Stolnack S、Lantz DW、Moore ZJ。2021. 具有不同光谱的人造光不会改变对湖岸边幼年奇努克鲑鱼和红鲑鱼的有害吸引力。湖泊保护区管理。37:313-322。

夜间人造光 (ALAN) 在海岸线发达的湖泊中很常见，特别是在存在幼鱼（包括鲑鱼）的近岸地区普遍存在。一种担忧是鱼类可能会被 ALAN 吸引并变得更容易受到捕食者的攻击。已建议使用更长波长的光来减少 ALAN 的影响；然而，幼年鲑鱼的反应并不为人所知。我们检验了这样一种假设，即较长波长的光会吸引较少的亚年幼奇努克鲑鱼 ( Oncorhynchus tshawytscha ) 和红鲑鱼 ( O. nerka )) 比较短波长的光。测试灯包括 4 个 LED 灯、一个白炽灯和一个高压钠灯 (HPS)。2017 年和 2018 年总共进行了 13 次实验试验，使用海滩围网共收集了 1769 条奇努克鲑鱼和 870 条红鲑鱼。光照处理的亚年幼鲑鱼的平均捕获率（每个海滩围网集的数量）为 51.0，而对照处理（无光照）仅为 6.6。在这两年中，我们都没有发现较长波长光（红色滤光和黄色滤光 LED 灯）和其他光中任一物种的捕获率有任何显着差异，因此我们拒绝了较长波长光会吸引较少的亚年幼鲑鱼。对于浅海岸线栖息地中鲑鱼的这些早期生命阶段，