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The collected zooplankton in the traps (or swimmers), can be studied in specific composition, for example in their size. An automated sediment trap (Technicap® PPS 3/3) with an opening area of 0.125m² was installed at 300 m depth with a resolution of 17 days (April 1st to October 15th 2012). This equipment was located in the adjacent area of Punta Banda, Ensenada, (31.64°N-116.74°W). The trap holds 12 collector bottles which contains a solution preserved with filtered seawater base (0.45µm) and formaldehyde at 4% buffered sodium tetraborate. Initially the zooplankton was separated by a sieve with net size of 1000 µm. The copepods represented the 74 % of swimmers individuals identified in Punta Banda, followed by polychaetes with 12 %, ostracods with 6.0 %, chaetognaths with 2%. The ctenophores and amphipods conformed less than 2%. From the copepods group present during the period between April through May (14–16°C), were identified the following species: Chiridius poppei, Eucalanus californicus, Euchirella sp (adults and juveniles), Gaetanus pungens, G. pileatus, Gaetanus miles, Scaphocalanus echinatus, Scolecithricella sp., Scottocalanus persecans. The specie G. pungens was persistent until the warm season (17–19°C). The compositions and abundance of copepods decreased at the end of the study period. Some of these zooplanktonic groups and other species of copepods, accompanying the marine snow can be considered part of the decomposer trophic chains and be part of the passive flow organic carbon in this area.

Palabras clave: copepods; estructura termohalina; sediment trap time series; Ensenada

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