Light wavelength and intensity effects on larval settlement in the Pacific oyster Magallana gigas

Oyster larvae initially have an eyespot on settlement stage (pediveligers). This study investigated the eyespot with light wavelength-dependent absorbance, and its functional details for settlement in the Pacific oyster Magallana gigas larvae. Eyespot efficiently absorbed 500–650 nm of light wavelen...

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Bibliographic Details
Published in:Hydrobiologia 2021-04, Vol.848 (7), p.1611-1621
Main Authors: Kim, Hee-Jin, Suematsu, Yumi, Kaneda, Hayato, Satuito, Cyril Glenn
Format: Article
Language:English
Subjects:
Absorbance
Behavior
Benthos
Biomedical and Life Sciences
Crassostrea gigas
Darkness
Ecology
Eyespot
Fisheries
Freshwater & Marine Ecology
Invertebrates
Laboratories
Larvae
Larval settlement
Life Sciences
Light
Light emitting diodes
Light levels
Light pollution
Light sources
Luminous intensity
Magallana gigas
Marine molluscs
Near infrared radiation
Near ultraviolet radiation
Oysters
Pollution levels
Primary Research Paper
Sperm
Substrates
Wavelength
Zoology
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Summary:Oyster larvae initially have an eyespot on settlement stage (pediveligers). This study investigated the eyespot with light wavelength-dependent absorbance, and its functional details for settlement in the Pacific oyster Magallana gigas larvae. Eyespot efficiently absorbed 500–650 nm of light wavelength. Based on the eyespot absorbance, pediveligers were subjected to different light conditions with light-emitting diodes (LEDs): near ultraviolet (NUV), blue, white, green, red, and near infrared (NIR), set at 3 intensities (5, 15, 25 W/m 2 , except for NIR, which was at 25, 50, 100 lux). LEDs modulated at each intensity were continuously irradiated for 2 days, and the number of settled larvae on a substrate of shell chips was counted daily. NUV at 15, 25 W/m 2 , and white and green light at 5, 15 W/m 2 disrupted larval settlement, whereas red at 25 W/m 2 and NIR at 100 lux showed strong settlement-inducing activities. Red and NIR were further tested with ceramic paper substrates; inert substrates. These lights maintained their performance, with settlement rates higher than controls in darkness. Our findings contribute to the further understanding of the function of eyespot in the settlement of oyster larvae, and to establish criteria to evaluate light pollution levels for protecting benthic ecosystem.
ISSN:0018-8158
1573-5117
DOI:10.1007/s10750-021-04550-9