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- W2064925462 abstract "Phototaxis by larvae of the flatworm Maritigrella crozieri was used to determine spectral sensitivity, the ontogeny of the phototactic pattern, and the lowest light intensity to induce a directional response (intensity threshold). Adult M. crozieri live in shallow water with the tunicate Ecteinascidia turbinata and have a planktonic larval phase lasting longer than 3 weeks. The primary spectral sensitivity maximum was at 500 nm, which is probably an adaptation to the spectrum available underwater at twilight. The phototactic threshold changed with age, as dark-adapted, 1-week-old larvae had a threshold (1.84×1017 photons m−2 s−1) an order of magnitude higher than that of 3-week-old larvae. Flatworm larvae are relatively insensitive to light as compared to other invertebrate larvae. Young larvae were positively phototactic at high light intensities and negative at low, a pattern typical of a predator avoidance shadow response. In contrast, older larvae were only positively phototactic, which would be useful for transport to shallow-water adult habitats." @default.
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- W2064925462 date "2003-01-01" @default.
- W2064925462 modified "2023-09-26" @default.
- W2064925462 title "Larval photoresponses of the polyclad flatworm Maritigrella crozieri (Platyhelminthes, Polycladida) (Hyman)" @default.
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- W2064925462 doi "https://doi.org/10.1016/s0022-0981(02)00448-3" @default.
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