Table 1 Research groups involved in the study, their study area, collection of photo-identification data (YES/NO), sampling effort (km), number of sightings, and ER (n sightings/km*100) per bathymetric range (0–200 m, 200–500 m, 500–1000 m, 1000–2000 m, > 2000 m). The codes in the first column represent the following research groups: AC (Associació Cetacèa), AdL (Accademia del Leviatano), AR (Archipelagos Institute of Marine Conservation), ARC (Alnilam Research and Conservation), AT (ARPAT - Agenzia Regionale per la Protezione dell’Ambiente Toscano), BB (OEC - Office de l’Environnement de la Corse), BDR (Bottlenose Dolphin Research Institute - BDRI), BR (Association BREACH Méditerranée), CA (Association CARI), CC (CE.TU.S. Cetacean Research Center), CES (CESRAM. - Centro Studi e Ambiente Marino), CG (CNR-IAS), CIM (CIMA Research Foundation), CRC (Centro Ricerca Cetacei), DDP (Delfini del Ponente APS), CDM, DM (Acquario di Genova), EDM (EDMAKTUB Association), EOI (EcoOcéan Institute), GAIA (Gaia Research Institute Onlus), GC (GECEM - Groupe d’Etude des Cétacés de Méditerranée), GP (Golfo Paradiso Whale Watching), IDP (Tethys Research Institute - Ionian Dolphin Project), IM (Morris Kahn Research Station, University of Haifa), JDC (Jonian Dolphin Conservation), KT (Ketos), LA (DMAD - Marine Mammals Research Association), LBA (University of Pisa), LSR (Sapienza University of Rome), MEO (MarEco Osservatorio della Natura), MKB (Menkab), MKI (Morris Kahn Research Station, University of Haifa), MOR (Morigenos – Slovenian Marine Mammal Society), MRS (MeRiS - Mediterraneo Ricerca e Sviluppo APS), MT, MTL (MareTerra - Environmental Research and Conservation), ODO (Oceanomare Delphis Onlus), PE (Pelagos - Provincia di Livorno), SAM (APS Sotto al Mare), SBN (SUBMON), TCR (TCR - Turkish Cetacean Research), TDP (Tunisian Dolphin Project), THA (Thalassa Ricerca e Formazione), TRI (Tethys Research Institute - Cetacean Sanctuary Research), UB (University of Barcelona), UGE (DISTAV - University of Genoa), UNITO (University of Torino - DBIOS). *BDR data were not included in the ER analysis as they were clearly anomalous due to the peculiar sampling context (dolphins were regularly sighted feeding near fish farms). **The total number of photo-identified individuals (4,919) does not correspond to the sum of the individuals photo-identified by the single research group, as the same individual can be identified by several groups.

From: Investigating the presence of different bottlenose dolphin ecotypes in the Mediterranean Sea