Duncan Souter

University of Queensland , Brisbane, Queensland, Australia

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Publications (1)2.44 Total impact

  • B. M. Degnan · Duncan Souter · Sandie M. Degnan · Suzanne C. Long ·
    [Show abstract] [Hide abstract]
    ABSTRACT:  Increased K+ concentration in seawater induces metamorphosis in the ascidian Herdmania momus. Larvae cultivated at 24°C exhibit highest rates of metamorphosis when treated with 40 mM KCl-elevated seawater at 21°C. At 24°C, H. momus larvae develop competence to respond to KCl-seawater and initiate metamorphosis approximately 3 h after hatching. Larval trunks and tails separated from the anterior papillae region, but maintained in a common tunic at a distance of greater than 60 μm, do not undergo metamorphosis when treated with KCl-seawater; normal muscle degradation does not occur in separated tails while ampullae develop from papillae-containing anterior fragments. Normal programmed degradation of myofibrils occurs when posterior fragments are fused to papillae-containing anterior fragments. These data indicate that H. momus settlement and metamorphosis only occurs when larvae have attained competence, and suggest that an anterior signalling centre is stimulated to release a factor that induces metamorphosis.
    Development Genes and Evolution 12/1996; 206(6):370-376. DOI:10.1007/s004270050066 · 2.44 Impact Factor

Publication Stats

49 Citations
2.44 Total Impact Points


  • 1996
    • University of Queensland 
      • Division of Molecular Cell Biology
      Brisbane, Queensland, Australia