Seasonal Dynamics of Diel Changes in Inshore Benthopelagic Communities of the Black Sea by the Example of the Golubaya Bay (Gelendzhik Town)

Abstract

Seasonal and diel changes in inshore plankton in the Golubaya Bay (near Gelendzhik Town) were studied at seven daily stations from October 1999 to September 2000. In the night-time, the plankton included both holoplanktonic and demersal species rising to the upper layers (benthopelagic plankton). The role of benthopelagic and holoplanktonic organisms in relation to the time of the day, season, and phase of the moon was determined. Benthopelagic plankton of the Golubaya Bay largely included amphipods (which were the most abundant), mysids, isopods, decapods, tanaids, cumaceans, and polychaetes.

Dial behavioral responses of Metamysidopsis elongata atlantica (Crustacea, Mysida) to gradients of salinity and temperature

“…In the assays performed under same salinity and temperature during the day, the vertical migration to the bottom observed was in agreement with the pattern suggested in the literature, which describes it as a general behavior of the mysids, which stand on the bottom during the daylight and migrate upwards during the night to feed on phyto and zooplankton (ALLEN, 1982;BEETON & BOWERS, 1982;RUDSTMAN et al, 1989;MCKENNEY & CELESTIAL, 1995;TAKAHASHI & KAWAGUCHI, 1997;BUSKEY, 1998;ROAST et al, 1998;CALLIARI et al, 2001;VIHERLUOTO & VIITASALO, 2001;HAMPEL et al, 2003;SCHARF & KOSCHEL, 2004;ANOKHINA, 2005).…”

“…Unlike adults, juveniles searched for bottom at constant salinities (28) or with a halocline of 25-30, generating conflicting results with the observations registered under room light conditions. A similar behavior pattern was observed in the wild for Archaeomysis kokuboi Ii, 1964 and Archaeomysis japonica Hanamura & Murano, 1996 at Otsuchi Bay in Japão (TAKAHASHI & KAWAGUCHI, 1997;ANOKHINA, 2005). It is likely that juvenile of M. e. atlantica may present this downward movement as an strategy to avoid predation, since adults, as described earlier, migrate to the surface at night in the search for food, even predating juvenile of their own species (ANOKHINA, 2005).…”

“…This result indicates that M. e. atlantica does not seem to be affected by the temperature gradients as observed in the wild (ANOKHINA, 2005).…”

“…In general, adult mysids remain close to bottom during the day (VIHERLOUTO & VIITASALO, 2001;SCHARF & KOSCHEL, 2004;TAKAHASHI et al, 2004;ANOKHINA, 2005) and migrate to surface during the night, where different species feed on phytoplankton, floating organic matter as well as on other zooplaktonic organisms (ALLEN, 1982;MCLACHLAN, 1983;ASTTHORSSON & RALPH, 1984;JERLING & WOODLDRIDGE, 1995;VIITASALO & RAUTIO, 1998).…”

Modern views about contour structure of aquatic environment and new approaches for the Black Sea and Azov Sea monitoring

“…The Black Sea demersal mesozooplankton consists mainly of Mysidacea, Isopoda and Cumacea (Anokhina, 2006). At night they can amount up to 90% of the total mesozooplankton biomass (Anokhina, 2005).…”