Bozman Andrea, Titelman Josefin, Kaartvedt Stein, Eiane Ketil, Aksnes Dag L
Faculty of Biosciences and Aquaculture, Nord University, Po Box 1490, 8049 Bodø, Norway.
Department of Biosciences, University of Oslo, PO Box 1066 Blindern, 0316 Oslo, Norway.
J Plankton Res. 2017 Mar;39(2):280-289. doi: 10.1093/plankt/fbw097. Epub 2017 Jan 12.
We tested the hypothesis that the coronate jellyfish distributes vertically according to a preferential range of absolute light intensities. The study was carried out in Lurefjorden, Norway, a fjord characterized by mass occurrences of this jellyfish. We collected data on the vertical distribution of medusa during day, dusk and night periods from video observations by a remotely operated vehicle in relation to estimated ambient light levels. Our results suggest that large (average size in catches ~9 cm diameter) avoided total irradiance levels above 5×10 µmol quanta m s. Nearly two-thirds of the population stayed above irradiance of 10 µmol quanta m s during daytime, while some individuals occupied much darker water. Thus, part of the population appeared to distribute vertically and undertake diel vertical migration (DVM) according to a preferential range of light intensities.
冠状水母根据绝对光照强度的优先范围进行垂直分布。该研究在挪威的吕勒峡湾进行，这是一个以大量出现这种水母为特征的峡湾。我们通过遥控潜水器的视频观测，收集了水母在白天、黄昏和夜间的垂直分布数据，并将其与估计的环境光照水平相关联。我们的结果表明，大型个体（捕获的平均大小约为直径9厘米）避开了总辐照度水平高于5×10微摩尔量子·米²·秒⁻¹的区域。在白天，近三分之二的种群停留在辐照度为10微摩尔量子·米²·秒⁻¹以上的区域，而一些个体则处于更暗的水域。因此，部分种群似乎根据光照强度的优先范围进行垂直分布并进行昼夜垂直迁移（DVM）。
