Phototactic behavior of the marine harpacticoid copepod Tigriopus japonicus related to developmental stages under various light conditions

摘要: Abstract Marine harpacticoid copepod Tigriopus japonicus is commonly distributed in the tide-pools and shows benthic behavior. To determine its phototactic behavior, movement pattern was investigated with different light wavelengths (white, peaks at 460 570 nm; blue 470 nm; green 525 nm; red 660 nm) intensities (0.5, 2.0, 3.5, 5.0, 15.0 W/m2) related to developmental stages i.e., nauplius adult. The eyespot of two groups efficiently absorbed wavelength from 400 550 nm, while level absorbance different. For horizontal nauplii showed negative phototaxis all tested ranging 0.5–5.0 W/m2, they lost 15 W/m2 conducted except shown phototaxis. adults 0.5 3.5 W/m2, positive 2.0 W/m2 regardless wavelengths. vertical only monitored adults. At 2.0 3.0 W/m2, >40% planktonic behavior light. results elucidate that T. has patterns which can be used manipulate distribution for dispersal.