We tested the hypothesis that the coronate jellyfish Periphylla periphylla 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 P. periphylla 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 P. periphylla (average size in catches ∼9 cm diameter) avoided total irradiance levels above 5×10 -3 μmol quanta m -2 s -1. Nearly two-thirds of the population stayed above irradiance of 10 -7 μmol quanta m -2 s -1 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.
|Original language||English (US)|
|Number of pages||10|
|Journal||Journal of Plankton Research|
|State||Published - Mar 1 2017|
Bibliographical notePublisher Copyright:
© The Author 2017. Published by Oxford University Press.
- Periphylla periphylla
- diel vertical migration
- jellyfish behavior
- light attenuation
ASJC Scopus subject areas
- Ecology, Evolution, Behavior and Systematics
- Aquatic Science