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Larval photoresponses of the polyclad flatworm Maritigrella crozieri (Platyhelminthes, Polycladida) (Hyman)

Publication ,  Journal Article
Johnson, KB; Forward, RB
Published in: Journal of Experimental Marine Biology and Ecology
January 8, 2003

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. © 2003 Elsevier Science B.V. All rights reserved.

Duke Scholars

Published In

Journal of Experimental Marine Biology and Ecology

DOI

ISSN

0022-0981

Publication Date

January 8, 2003

Volume

282

Issue

1-2

Start / End Page

103 / 112

Related Subject Headings

  • Marine Biology & Hydrobiology
  • 31 Biological sciences
  • 07 Agricultural and Veterinary Sciences
  • 06 Biological Sciences
  • 05 Environmental Sciences
 

Citation

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Johnson, K. B., & Forward, R. B. (2003). Larval photoresponses of the polyclad flatworm Maritigrella crozieri (Platyhelminthes, Polycladida) (Hyman). Journal of Experimental Marine Biology and Ecology, 282(1–2), 103–112. https://doi.org/10.1016/S0022-0981(02)00448-3
Johnson, K. B., and R. B. Forward. “Larval photoresponses of the polyclad flatworm Maritigrella crozieri (Platyhelminthes, Polycladida) (Hyman).” Journal of Experimental Marine Biology and Ecology 282, no. 1–2 (January 8, 2003): 103–12. https://doi.org/10.1016/S0022-0981(02)00448-3.
Johnson KB, Forward RB. Larval photoresponses of the polyclad flatworm Maritigrella crozieri (Platyhelminthes, Polycladida) (Hyman). Journal of Experimental Marine Biology and Ecology. 2003 Jan 8;282(1–2):103–12.
Johnson, K. B., and R. B. Forward. “Larval photoresponses of the polyclad flatworm Maritigrella crozieri (Platyhelminthes, Polycladida) (Hyman).” Journal of Experimental Marine Biology and Ecology, vol. 282, no. 1–2, Jan. 2003, pp. 103–12. Scopus, doi:10.1016/S0022-0981(02)00448-3.
Johnson KB, Forward RB. Larval photoresponses of the polyclad flatworm Maritigrella crozieri (Platyhelminthes, Polycladida) (Hyman). Journal of Experimental Marine Biology and Ecology. 2003 Jan 8;282(1–2):103–112.
Journal cover image

Published In

Journal of Experimental Marine Biology and Ecology

DOI

ISSN

0022-0981

Publication Date

January 8, 2003

Volume

282

Issue

1-2

Start / End Page

103 / 112

Related Subject Headings

  • Marine Biology & Hydrobiology
  • 31 Biological sciences
  • 07 Agricultural and Veterinary Sciences
  • 06 Biological Sciences
  • 05 Environmental Sciences