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1994 (1)
1Author    Karl-Heinz TomaschkoRequires cookie*
 Title    Defensive Secretion of Ecdysteroids in Pycnogonum litorale (Arthropoda, Pantopoda)  
 Abstract    In response to disturbance, the pycnogonid Pycnogonum litorale discharges a mixture o f eight ecdysteroids (ES). Repeated intensive m olestation causes 99% secretion o f the endogenous ES present. The concentration o f the total ES in the defensive effluent is 1.0 x 10" 3 m o lT '1. 20-Hydroxyecdysone 22-acetate, the predominant ES, reaches 0.8 x 10" 3 m ol T_1. This is sufficient to deter significantly feeding by the com m on shore crab Carcinus maenas, a generalist predator in the habitat o f the pycnogonid. There is evidence that the secreted ES o f P. litorale contribute to its unpalatability. The present paper describes for the first time defensive secretion in marine arthropods. 
  Reference    Z. Naturforsch. 49c, 367—371 (1994); received February 10 1994 
  Published    1994 
  Keywords    Pycnogonids, Pycnogonum litorale, Ecdysteroids, Defensive Secretion, Chemical Defense 
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 TEI-XML for    default:Reihe_C/49/ZNC-1994-49c-0367.pdf 
 Identifier    ZNC-1994-49c-0367 
 Volume    49