The associated data highlights the sampling programme for the data acquisition campaign of Observation on the Aerial Platform for the SAMM1and SAMM2 campaigns (Aerial Marine Megafauna Monitoring) conducted by the PELAGIS observatory (UMS 3462 ULR/CNRS). The sampling plan is composed of preestablished sampling strata and transects. These were drawn up according to the specific characteristic of the study area “Mainland France”, or FrM. Description of fields and values of allocation tables: : ( - field name, meaning: value, description of values) region char 5 Study area region_lbl char 50 labelled study area idCampagne (survey) char 15 Name of the campaign programme char 20 Programme name sector char 10 Sampling sector short ID strate char 5 Sampling strata short ID strate_lbl char 15 Labelled sampling strata areaKM double Strata surface area transect_name char 10 transect sampling length_km double Transect length start_x double Coordinates of the start of transect x in decimal degree start_y double Coordinates of the start of transect y in decimal degree end_x double Coordinates of the end of transect x in decimal degree end_y double Coordinates of the end of transect y in decimal degree

Location distribution per grid cell of 8 harbor seals (Phoca vitulina), followed by Fastloc GPS / GSM tags from the bay of Mont Saint-Michel from 2006 to 2008

Total number of gray seals (Halichoerus grypus) neonates identified at various colonies along the French coast during the fourth quarters of 2007 to 2009.

This is the path of the continental shelf break of the Bay of Biscay’s northwestern border.

Location distribution per grid cell of 8 young harbor seals (Phoca vitulina), followed by Argos tags (between 2005 and 2008) along the English Channel coast following rehabilitation at the care center CHENE.