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The seasonal population structure and vertical distribution of Sagitta decipiens Fowler and Sagitta lyra Krohn in the south Adriatic Pit

On the basis of samples collected in South Adriatic Pit during five cruises, abundance and vertical distribution of Sagitta decipiens and Sagitta lyra and their developmental stages were investigated. A wide vertical distribution (from surface to 1000 m) was noted for both species. Moreover, in the layers below 100 m depth, these species made more than 90% total chaetognaths. The bulk of the S. lyra population (mostly juveniles) was located in the upper 200 m, whereas S. decipiens was most numerous in the 100 to 300 m depth. Both species displayed an ontogenetic vertical distribution with the older stages occuring at greather depth.

zooplankton; chaetognatha; Adriatic sea

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