The main aim of the dataset is preparing the available data by diversity and distribution of the Black Sea seagrasses, which were collected the scientists from IBSS around Ukranian and Russian coastal zone during last 50 years (1960 - 2009). The data about region, location, sampling equipment are given for each seagrass species. The species diversity is described from 45 transects, 164 stations at 0,3 - 20 m depth. These data are available now for scientists, professionals and they can be used in various purposes.

The main aim of the dataset is preparing the available data by diversity of the Black Sea macroalgae, which were collected by the scientists from IBSS around Crimean coast of the Ukrainian shelf during the last 40 years. The species diversity is described from 43 transects, 180 stations at 0,1 - 25 m depth. The data about location, region, sampling equipment are given for each macroalgae species. These data are available now for scientists, professionals and they can be used in various purposes.

Abundance (individuals/m2) of macrozoobenthic taxa at littoral/upper infralittoral soft-bottom stations in the Natura 2000 MPA "Ropotamo" (BG0001001), southern Bulgarian Black Sea. The data were collected during field surveys of IBER-BAS in 2013 as part of project COCONET. The dataset also contains a visual description of sediment type at the stations, and a habitat type classification to EUNIS L3.

The direct or indirect influence of a river plume on meiofaunal abundance and community composition was investigated in the North Adriatic Sea (NW Mediterranean Sea).

Abundance (individuals/m2) and biomass (g/m2) of macrozoobenthic taxa from seagrass meadows along the Southern Bulgarian Black Sea coast (Burgas Bay), collected during field surveys of IBER-BAS in 2013-2014 as part of project PERSEUS. Due to the sampling method (hand corer), the dataset represents the infauna associated with the seagrasses. The dataset also contains measurements of several environmental parameters at the stations: sediment grain size (% gravel, sand, and silt/clay); sediment moisture content (%) and total organic matter (% loss on ignition); temperature and salinity of the water.