Figure 3

Spatial distribution of events detected by year (1990–2019) and the corresponding SST mean temperatures between June and July for each year. Only the SST gradient of the years with presence of nesting events (light blue circles) or attempts (white triangles) is illustrated. The isotherm of 21 °C SST, which is the threshold suggested as critical for the presence of nesting events in the Western Mediterranean³⁴ is represented with a dashed black line. Maps created using QGIS vs 3.22.9 software (https://www.qgis.org/en/site/).