Secondary production of Capitella sp. (Polychaeta: Capitellidae) inhabiting different organically enriched environments*

摘要: Three populations of Capitella sp. submitted to three different environmental conditions were monitored during one year in Alfacs Bay (Ebro Delta, NW Mediterranean) estimate their respective contributions the secondary production. Yearly production at sites under study 0.83 gDW. m-2. y-1 for disturbed sand site, 3.74 typical silt and 36.9 site. The corresponding P/B ratios 4.09 y-1, 3.66 5.71 respectively. At two silty sites, presents: (1) a marked seasonal variability, (2) high rates ratios, which are characteristics opportunists. site its pattern is much more stable, lower (although still high). “within site” differences found between probably did not result from temporal changes food quantity nor quality. Nevertheless, protein concentrations may contribute explain maximal densities biomasses observed among sites. Our results confirm that shows great plasticity relative environment.