Hinrichsen Hans-Harald hhinrichsen@geomar.de Piatkowski Uwe upiatkowski@geomar.de 0000-0003-1558-5817 Jaspers Cornelia coja@aqua.dtu.dk 0000-0003-2850-4131 2022 Evidence of extraordinary marine species in the SW Baltic Sea dataset https://doi.org/10.1594/PANGAEA.942035 2022-03-08T11:00:40 The presence of an extended salinity gradient of the Baltic Sea reveals a variety of species occur at the limit of their physiological tolerance and preference, i.e. in areas and habitats not representing their marine or fresh water origin. Hence, the Baltic Sea is known for its high share of non-indigenous species, which have established. In this study, we compiled extraordinary sightings of transient, non-native or potentially range expanding species, such as jellyfish, squid, fishes and marine mammals in the SW Baltic Sea for a period from 2001 to 2018. We focused on jellyfish, squid, fishes and marine mammals. Hydrographic conditions, such as water temperature and salinity, obtained from a high spatio-temporally resolved hydrodynamic Baltic Sea model, covering a daily resolved 40-year time series were linked to the sightings of these extraordinary species. Our hydrodynamic modelling results demonstarted that changes in the occurrence of exceptional species reflect the dynamics of water mass exchange between the Kattegat/Skagerrak and the SW Baltic Sea. Our analyses show that these changes could be related to the presence of anomalously high saline water masses. This documents that the hydrographically highly dynamic SW Baltic Sea needs special attention for monitoring of non-indigenous species, as high saline and warm water intrusions are more frequent than currently believed and ii) can be linked to sightings of exceptional species in the SW Baltic Sea. Hinrichsen Hans-Harald hhinrichsen@geomar.de Piatkowski Uwe upiatkowski@geomar.de 0000-0003-1558-5817 Jaspers Cornelia coja@aqua.dtu.dk 0000-0003-2850-4131 2022 Sightings of extraordinary marine species in the SW Baltic Sea linked to saline water inflows journal article Journal of Sea Research 181 https://doi.org/10.1016/j.seares.2022.102175 102175 not specified The Velux Foundations (Villum Foundation) https://doi.org/10.13039/100008397 25512 VILLUM FONDEN, Denmark 13 CC-BY-4.0 Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/ File content Content Hinrichsen Hans-Harald hhinrichsen@geomar.de Content Binary Object Binary Hinrichsen Hans-Harald hhinrichsen@geomar.de Binary CurationLevelB Basic curation https://wiki.pangaea.de/wiki/Curation_levels citable geomar author20033 author32266 author45824 award1155 curlevel20 funder20914 journal9708 license21 param146419 param99583 pi32266 ref112225 term242 topotype1