Figure 2

GPS locations of (a) German and (b) Spanish sampling sites. Maps generated using Google Earth v7.1.5.1557 ((Map data: Google 2016: (a) GeoBasis-DE/BKG 2009; Imange Landsat; and Data SIO NOAA USA Navy, NGA, GEBCO and (b) Data SIO NOAA USA Navy, NGA, GEBCO; Image Landsat; and US Dept of State Geographer).