- The Database contains following information:
- Phylum/division or class an alien plant or animal species belongs to.
- Ecofunctional group
- Major ecological/taxonomic groups (PHYTOPLANKTON, ZOOPLANKTON, BENTHIC macrofauna and FISHES) are subdivided according to their dominant feeding type:
Phytoplankton includes AUTO-, HETERO- and MIXOTROPHS
Zooplankton includes SUSPENSION FEEDERS and PREDATORS
Benthic macrofauna comprises SUSPENSION- and DEPOSIT FEEDERS, OMNIVORES, NECTOBENTHIC organisms and WOOD-BORERS
Fishes are divided into PHYTOPHAGOUS, PLANKTIVOROUS, BENTHOPHAGOUS and PREDACIOUS ones.
Such groups as MACROPHYTES, INVERTEBRATE PARASITES, BIRDS and MAMMALS presently are distinguished without division into sub-groups.
- Known or probable donor area.
- Vector of introduction
- Known (1) or probable (2) way of species introduction into the Baltic Sea:
- 1) intentional introduction for STOCKING and/or ORNAMENTAL purposes;
- 2) unintentional introductions by SHIPPING (incl. ballast water of ships, boat hulls, rafts and flotsam moved via inland canals) or ASSOCIATED with aquaculture.
- The category “UNKNOWN” is applied if no one of the above vectors is thought to be relevant.
- Year of the first observation
- Year of the first observation in the Baltic Sea. Records marked by asterisk (*) indicate that only the decade of introduction (sometimes even the century) is known; “0” means unknown time of introduction.
- Ecological impact
- Known or likely impact on native biodiversity and ecosystem functioning: COMPETITION for food and/or space, HABITAT CHANGE, new FOOD-PREY for native species, PREDATION on native species, HERBIVORY, HYBRIDIZATION with native populations, PARASITISM, TOXICITY = excretion of phytotoxins, COMMUNITY DOMINANCE = quantitative changes in community structure, BENTIC-PELAGIC INTERACTION = new linkages between benthic and pelagic environment, BIOACCUMULATION = storage of toxic substances.
- Impacts on uses / resources
- Known or likely impact on HUMAN HEALTH and uses of the sea/natural resources: AQUACULTURE, AQUATIC TRANSPORT, FISHERIES, TOURISM, WATER ABSTRACTIONS and WATER QUALITY.
- Data on species establishment in the Baltic Sea or adjacent freshwater bodies: ESTABLISHED, NOT ESTABLISHED or STATUS UNKNOWN.
- Salinity range
- Data on species salinity ranges in the Baltic Sea and in the native region. The salinity intervals are distinguished accordingly to the Venice system:
Linmetic ||<0.5 PSU
ß-Oligohaline ||0.5-3 PSU
a-Oligohaline ||3-5 PSU
ß-Mesohaline ||5-10 PSU
a-Mesohaline ||10-18 PSU
Polymixohaline ||18-30 PSU
Euhaline ||30-40 PSU
Hyperhaline ||>40 PSU
- Baltic sub-regions
- Summary on alien species in the sub-regions of the Baltic Sea.
- Bibliographic descriptions of all information sources used in the Database.