Acta Adriatica, Vol. 52 No. 2, 2011.
Original scientific paper
A short-term investigation of diel vertical migrations of the calycophoran Siphonophora in the open south Adriatic Sea (July 2003)
Davor LUČIĆ
; Institute for Marine and Coastal Research, University of Dubrovnik, Croatia
Adam BENOVIĆ
; Institute for Marine and Coastal Research, University of Dubrovnik, Croatia
Mirna BATISTIĆ
; Institute for Marine and Coastal Research, University of Dubrovnik, Croatia
Mira MOROVIĆ
; Institute of Oceanography and Fisheries, Split, Croatia
Ivona ONOFRI
; Institute for Marine and Coastal Research, University of Dubrovnik, Croatia
Juan-Carlos MOLINERO
; Leibniz Institute of Marine Sciences, IFM-GEOMAR, Kiel, Germany
Tjaša KOGOVŠEK
; Marine Biological Station, National Institute of Biology, Piran, Slovenia
Barbara GANGAI
; Institute for Marine and Coastal Research, University of Dubrovnik, Croatia
Marijana MILOSLAVIĆ
; Institute for Marine and Coastal Research, University of Dubrovnik, Croatia
Abstract
Morning, midday, evening and night repetitive sampling was used to demonstrate calycophoran diel vertical migration (DVM) at a fixed station in the oligotrophic southern Adriatic Sea at 8 depth intervals. Of 20 calycophoran species collected, most of them inhabited layers of specific tempera-ture and light intensity, and migrated during the night. The deep species Kephyes ovata is primarily non-migratory. Typical nocturnal movements to the surface were recorded for Lensia conoidea and sphaeronectes koellikeri. Lensia subtilis and eudoxoides spiralis migrated toward the surface in the evening but sank deeper at night. Lensia meteori and Lensia fowleri reached upper layers at midday. The DVM of sphaeronectes irregularis was irregular and independent of diel light pat-terns. Though low in numbers, some calycophorans were found above the thermocline at night. For mesopelagic species, however, higher summer surface temperatures proved an effective barrier to migration above 100 m. Thus, certain species could be represented as key species of planktonic cni-darian assemblages found within a certain depth range. Though not homogenous, and while some undertake nocturnal migrations in both directions, all are interrelated by preferences of bathymetric distribution and specific DVM behavior.
Keywords
Cnidaria; PAR; jelly plankton; vertical distribution; Mediterranean Sea
Hrčak ID:
89660
URI
Publication date:
30.11.2011.
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