The distribution of Streblospio gynobranchiata was studied. Sediment samples were collected with grab 0/1m2 in spring, summer, fall and winter 2012 from 12 stations (ranging from 5, 10, 20 and 50 meters in depth) in the southern Caspian Sea from Behshahr to Ramsar (Mazandaran-Iran) coasts. Results indicated that the highest density was observed in summer in depth of 10 m (64.24 ind /0.1m2). Maximum and minimum of density was measured respectively in summer (27.22 ind /0.1m2) and winter (16.99 ind /0.1m2). A significant correlation was not observed between this species with total organic matter and silt and clay (P>0.05). For comparing the different seasons the One Way Anova was used. The results indicated no significant differences among seasons (P>0.05).
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