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.- An Environmental Monitoring Index based on the temporal variations in the abundance of two benthic polychaetes (Nepthys  impressa  Baird,  1871  and  Prionospio  peruana  Hartmann-Schröder  1962a)  is  proposed. , Three ,replicated  samples were collected in four subtidal stations at Quintero Bay (32º45’ S, 71º29’ W; 6 to 13 m deep), central Chile, with a Van Veen grab 0,1 m,; the sampling campaigns were carried out in March and  November  1995  and  1996,  April,  August  and  November,1997  and ,March  1998.   This ,study  allowed ,to  evaluate,the  use ,of  population ,parameters ,of  the ,benthic  component,in environmental impact,programs,according to the technical requirements of DGTM and MM (Chilean Navy). Nepthys impressa  (Ni)  is  a  common ,species  whose ,abundance  (N) varied in one order of magnitude and occurred in sediments with low  percentage  of  organic  matter,  MO  (<  1%).  Instead, Prionospio peruana  (Pp)  is  an  opportunistic  species,  uncommon, with  its  abundance  varying  four  orders  of  magnitude. This  species  was  associated  to  altered  sediments,  moderately,enriched  in  terms ,of  organic ,matter  (≈  3%).   The  temporal variations  in  the  abundance  of  both ,species  allows  to  propose the Environmental Monitoring Index (IVA): IVA = Log [(NNi/(NPp + 1))* 100], The index  identified  three  phases  at  subtidal  sediments:  a)  a  moderate enrichment  in  March,  1996  (3%  MO;  IVA<1)  with

revista de biología marina y oceanografía

Proposición de un índice de vigilancia ambiental basado en la variabilidad temporal de la abundancia de dos especies de poliquetos bentónicos de bahía Quintero, Chile