Abundance on genus levels for cyanobacteria, abundance at group level for picoeukaryotes, total bacteria abundances. The goal is to provide a background information on abundances to link to punctual experiments on dynamics (growth and grazing) and ecotoxicological tests.

Copepod (<i>Calanus helgolandicus</i>) egg production, % egg hatching success, fecal pellet production per female per day measured weekly/biweekly at 6 stations along a transect from the Po River to central North Adriatic Sea

Ciliate numbers and biomass were measured in weekly samples since September 1996, heterotrophic dinoflagellates from 2007.

Copepod (<i>Centropages typicus</i>) egg production, % egg hatching success, fecal pellet production per female per day measured weekly at a fixed station in the Gulf of Naples (Station Marechiara)

The "MARECHIARA-phytoplankton" dataset contains phytoplankton data collected in the ongoing time-series at Stn MC ( 40°48.5' N, 14°15' E) in the Gulf of Naples. This dataset spans over the period 1984-2006 and contains data of phytoplankton species composition and abundance. Phytoplankton sampling was regularly conducted from January 1984 till July 1991 and in 1995-2006. Sampling was interrupted from August 1991 till January 1995. The sampling frequency was fortnightly till 1991 and weekly since 1995. Phytoplankton samples were collected at 0.5m depth using Niskin bottles and immediately fixed with formaldehyde (0.8-1.6% final concentration) for species identification and counts.

The Tara Oceans project sampled contrasting ecosystems of the world oceans during a three-year expedition (2009-2013), collecting environmental data and plankton, from viruses to metazoans, on board the 36-metre Tara Schooner. It surveyed 210 ecosystems in 20 biogeographic provinces, collecting over 35,000 samples of seawater and plankton. Samples were later analysed using modern sequencing and state-of-the-art imaging technologies.

The dataset provides the monthly phytoplankton data (species composition and abundance - one sampling per month out of four) collected at the Long Term Ecological Research station “MareChiara” (LTER-MC) in the Gulf of Naples (Tyrrhenian Sea, Western Mediterranean) from 1995 to 2015. The data set also includes environmental variables data (temperature, salinity, nutrients and chlorophyll a) aquired during the same sampling events.

The dataset provides the monthly zooplankton observations (species composition and abundance - one sampling per month out of four) conducted at the Long Term Ecological Research station “MareChiara” (LTER-MC) in the Gulf of Naples (Tyrrhenian Sea, Western Mediterranean) from 1995 to 2015.

The ClimateFish database collates abundance data of 15 fish species proposed as candidate indicators of climate change in the Mediterranean Sea. Data were collected according to a simplified visual census methodology (Garrabou et al. 2019) along standard transects of five minutes performed at a constant speed of 10m/min, corresponding approximately to an area of 50x5m. Four different depth layers were surveyed: 0-3m, 5-10 m, 11-20 m, 21-30 m. So far, the ClimateFish database includes fish counts collected along 3142 transects carried out in seven Mediterranean countries between 2009 and 2021, for a total number of 101'771 observed individuals belonging to the 15 fish species.

The Mass Mortality Events database (hereafter MME-T-MEDNet) is a collaborative initiative involving more than 30 research institutions from 10 Mediterranean countries including EU and non-EU countries. This initiative aims to facilitate the access to information (published in scientific journals and gray literature or still unpublished) related to Mediterranean Mass Mortality Events (MMEs).