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Position of arm loss and rate of arm regeneration by Luidia clathrata(Echinodermata: Asteroidea)
Lawrence, J.M.; Pomory, C.M. (2008). Position of arm loss and rate of arm regeneration by Luidia clathrata(Echinodermata: Asteroidea). Cah. Biol. Mar. 49(4): 369-373
In: Cahiers de Biologie Marine. Station Biologique de Roscoff: Paris. ISSN 0007-9723, more
Peer reviewed article  

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    Regeneration; Asteroidea [WoRMS]; Luidia Forbes, 1839 [WoRMS]; Marine

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  • Lawrence, J.M.
  • Pomory, C.M.

    Three contiguous arms of six individuals of the asteroid Luidia clathrata were amputated. The initial mean lengths (± SE) of the two intact arms were 57 .36 ± 2.13 and 57 .38 ± 1.97 mm. The initial mean lengths of the amputated arm stumps were 12 .18 ± 0.59 (proximal) , 25.91 ± 1.67 (medial) and 42 .25 ± 1.37 (distal) mm. Buds appeared on all amputated arms after approximately 8 days. After 54 days proximal, medial and distal regenerated arms had mean lengths (±SE) of 10 .96 ± 0.90 , 7.69 ± 0.61 and 3.99 ± 0.38 mm, mean dry weights (±SE) of 41.75 ± 6.79, 20.95 ± 3.1 8, 8.07 ± 1.1 3 mg, and mean amounts of organic matter (pooled samples) of 6, 3 and 1 mg, respectively. All three arm positions are statistically different from one another (P < 0.001). Appearance of arm buds is the first phase of arm regeneration and is independent of position of amputation (distance from dise). Growth of regenerating arms is the second phase and is dependent on position of amputation. Studies have reported rate of growth of intact arms and of arms regenerating from the dise also declines as the asymptotic length of the arm is reached . This suggests similar mechanisms of control of growthoccur· in all three situations, all depending on the relative position of the regenerating arm tip.

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