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Keywords:

  • Hydroids;
  • ecology;
  • zonation;
  • light;
  • water movement;
  • seasonality;
  • temperature;
  • multivariate analysis;
  • Mediterranean Sea

Abstract. .The distribution in space and time of a hydroid community on a vertical rocky substratum is studied from the surface to 20 m depth. The role of the major environmental factors (light, water movement, temperature) in determining the zonation is evaluated. The results are compared with the main zonation models of Mediterranean benthos. The autecology of the collected species is briefly described.