The average water content in specimens from the Gulf of Gdańsk was significantly higher than in specimens from the Dead Vistula and the Vistula Lagoon ( Rychter 1999, Normant et al. 2004). It is known that the water content in
find more crab tissues is not only species-specific, but can also exhibit interpopulational variability ( Normant et al. 2000, Balasubramanian & Suseelan 2001). It seems that, in the Gulf of Gdańsk, R. harrisii has established a stable population in favourable living conditions that enable its successful development; this is manifested by the growing number of specimens collected ( Hegele-Drywa & Normant 2009, 2014). The high number of smallest-size specimens indicates the reproductive success of R. harrisii in this region. The Harris mud crab
population from the Gulf of Gdańsk revealed similar morphometric features (e.g. carapace width, wet weight) like other European populations and, because of the lack of parasites, achieves greater carapace widths than specimens from its native regions. Additionally, based on the condition of specimens inhabiting the Gulf of Gdańsk, which was similar to that in specimens from a self-sustainable population check details established over 60 years ago, it might be assumed that this species is likely to expand its distribution range along the Baltic coast. Therefore, more detailed studies of the ecology of this species are needed in order to explore the possible influence of this species on the aquatic
habitat and community of the Gulf of Gdańsk. “
“Heterotrophic bacteria play a significant role in marine habitats. Causing organic matter to decay and mineralise, they are, together with the phytoplankton, the most important organisms responsible for the carbon cycle in fresh and marine waters (Hoppe et al. 2002). Intensively respiring bacteria influence the carbon dioxide concentration in the hydrosphere and indirectly in the atmosphere. Moreover, chemotrophic bacteria use dissolved organic matter (DOM) to build up fresh particulate matter. Thus, they play an important part in the carbon cycle, often Miconazole called the microbial loop in the food web (Azam et al. 1983). After the Black Sea, the Baltic Sea is the second largest brackish sea in the world. Its salinity ranges from 2 to 30. In the southern Baltic Proper and the Gulf of Gdańsk, the salinity of the surface layer oscillates around 7. Such conditions permit the real coexistence of marine and freshwater bacteria, as observed in the Baltic Sea (Riemann et al. 2008, Holmfeldt et al. 2009, Herlemann et al. 2011). The metabolic activity of freshwater bacteria and their importance in bacterial production was confirmed by Piwosz et al. (2013). Compared to other Baltic Sea regions, the Gulf of Gdańsk is a highly productive region and the high level of community respiration makes the system net-heterotrophic (Witek et al. 1997).
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