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Journal of Chemical Ecology

, Volume 21, Issue 12, pp 1931–1946 | Cite as

Natural variation of toxicity in encrusting spongeCrambe crambe (Schmidt) in relation to size and environment

  • Mikel A. Becerro
  • Xavier Turon
  • María J. Uriz
Article

Abstract

The presence of intraspecific variation in toxicity and its relationship with biological or ecological factors were studied in the spongeCrambe crambe. Within-specimen (periphery and central part), between-size (<1000 mm2 in area, between 1000 and 10,000 mm2 and >10,000 mm2) and between-habitat (well-illuminated and dark communities) variations in toxicity were evaluated by the Microtox bioassay. Quantitative differences were detected that were not attributable to within-specimen variation but to size and habitat effects. Habitat comparisons showed that sponges in the shaded habitat were significantly more toxic than those of the well-illuminated community. Sponges of the smaller size classes displayed significantly less toxicity than the medium-sized specimens. Results are interpreted under the optimal defense theory and their ecological implications are considered.

Key Words

Chemical ecology natural toxicity spatial variation defensive strategy encrusting sponges 

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Copyright information

© Plenum Publishing Corporation 1995

Authors and Affiliations

  • Mikel A. Becerro
    • 1
  • Xavier Turon
    • 2
  • María J. Uriz
    • 1
  1. 1.Centre for Advanced Studies (CSIC) Camí de Sta. Bàrbara s/nBlanes (Girona)Spain
  2. 2.Department of Animal Biology (Invertebrates) Faculty of BiologyUniversity of BarcelonaBarcelonaSpain

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