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Figure

Temporal development of the number of species of each biogeographical affinity group (top) and of the ratio between Lusitanian and Boreal species with sea surface temperature (bottom) by marine region

Figure Created 02 Feb 2024 Published 16 Feb 2024 Last modified 16 Feb 2024
2 min read
The charts show: Top figures: the temporal development in the number of species of each biogeographical affinity group (Atlantic, Boreal, Lusitania and Unknown) by marine region (Greater North Sea, Baltic Sea, Celtic Seas and Bay of Biscay and the Iberian Coast). Bottom figures: the temporal development of the ratio between Lusitanian and Boreal species and sea surface temperature by marine region to investigate correlations.

European data

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Additional information

• The figure shows the number and the ratios of the number of Lusitanian species to the number Boreal species (L:B ratios) observed by year.
• It also shows sea surface temperature (SST) anomalies centred and scaled so that SST series and L:B ratios have the same mean and variance, to aid comparison.
• Data for 1969 are not displayed as the North Sea International Bottom Trawl Survey (NS-IBTS) survey used theHerring Bottom Trawl 180 feet (H18) herring bottom trawl instead of the Grande Ouverture Verticale (GOV) trawl in that year.

Geographical coverage
Marine Strategy Framework Directive (MSFD) sub-regions: Baltic Sea, Bay of Biscay and the Iberian Coast, Celtic Seas, Greater North Sea, and widely distributed

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Geographic coverage

Temporal coverage

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