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Changes in behavior and eye morphology of boreomysis megalops crustacea mysidacea following exposure to short periods of artificial and natural daylight


, : Changes in behavior and eye morphology of boreomysis megalops crustacea mysidacea following exposure to short periods of artificial and natural daylight. Journal of Experimental Marine Biology & Ecology 85(2): 135-148

G.O. Sars were collected from 240 m depth using a protective cod-end, which shielded the eyes from light exposure. Animals were divided into groups which were exposed to darkness (DE) or to natural or artificial daylight (LE) for periods of 1-15 min or 4 h. Some animals were thereafter kept in aquaria under simulated habitat light conditions (light/dark cycles). The animals were observed in IR light. DE animals showed a vertical zonation behavior in the laboratory similar to that obtained from sledge data: i.e. the animals stayed close to the bottom during daytime (light) and spread out vertically at night (darkness). LE individuals showed putative pathological changes both in zonation behavior in the laboratory and in eye-morphology. The photoreceptor membranes of the 6 main retinula cells were damaged. The 7th cell was unaffected by light exposures. A correlation was found between the extent of damage to the eye and the degree of modification of vertical zonation behavior. The groups exposed to the least light showed the smallest changes in zonation behavior and eye-morphology. The light induced changes were not reversed even after 4 days in the aquarium under simulated habitat light conditions. In conclusion, deep living animals with well-developed and very light sensitive eyes should be protected from daylight during sampling and handling. IR light should be used for observation purposes.

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