FN Archimer Export Format PT J TI Assessing cetacean surveys throughout the Mediterranean Sea: a gap analysis in environmental space BT AF MANNOCCI, Laura ROBERTS, Jason J. HALPIN, Patrick N. AUTHIER, Matthieu BOISSEAU, Oliver BRADAI, Mohamed Nejmeddine CANADAS, Ana CHICOTE, Carla DAVID, Lea DI-MEGLIO, Nathalie FORTUNA, Caterina M FRANTZIS, Alexandros GAZO, Manel GENOV, Tilen HAMMOND, Philip S. HOLCER, Drasko KASCHNER, Kristin KEREM, Dani LAURIANO, Giancarlo LEWIS, Tim DI SCIARA, Giuseppe Notarbartolo PANIGADA, Simone ANTONIO RAGA, Juan SCHEININ, Aviad RIDOUX, Vincent VELLA, Adriana VELLA, Joseph AS 1:1,2;2:1;3:1;4:3;5:4,5;6:6;7:7;8:8;9:9;10:9;11:10;12:11;13:8;14:12,13,14;15:14;16:15,16;17:17;18:18;19:10;20:4,5,19;21:20;22:20;23:21;24:18,22;25:23;26:24,25;27:25,26; FF 1:;2:;3:;4:;5:;6:;7:;8:;9:;10:;11:;12:;13:;14:;15:;16:;17:;18:;19:;20:;21:;22:;23:;24:;25:;26:;27:; C1 Duke Univ, Nicholas Sch Environm, Marine Geospatial Ecol Lab, Durham, NC 27708 USA. 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C2 UNIV DUKE, USA IRD, FRANCE UNIV LA ROCHELLE, FRANCE MCR, UK IFAW, UK INSTM, TUNISIA ALNILAM RES & CONSERVAT, SPAIN SUBMON MARINE ENVIRONM SERV, SPAIN ECOOCEAN INST, FRANCE ISPRA, ITALY PELAGOS CETACEAN RES INST, GREECE MORIGENOS SLOVENIAN MARINE MAMMAL SOC, SLOVENIA UNIV PRIMORSKA, SLOVENIA UNIV ST ANDREWS, UK BLUE WORLD INST MARINE RES & CONSERVAT, CROATIA CROATIAN NAT HIST MUSEUM, CROATIA UNIV FREIBURG, GERMANY UNIV HAIFA, ISRAEL NORTH ATLANTIC & MEDITERRANEAN SPERM WHALE CATALO, UK TETHYS RES INST, ITALY UNIV VALENCIA, SPAIN UNIV HAIFA, ISRAEL UNIV LA ROCHELLE, FRANCE UNIV MALTA, MALTA BIOL CONSERVAT RES FDN, MALTA UNIV MALTA, MALTA UM MARBEC IN DOAJ IF 4.011 TC 44 UR https://archimer.ifremer.fr/doc/00626/73789/75004.pdf https://archimer.ifremer.fr/doc/00626/73789/75005.doc LA English DT Article AB Heterogeneous data collection in the marine environment has led to large gaps in our knowledge of marine species distributions. To fill these gaps, models calibrated on existing data may be used to predict species distributions in unsampled areas, given that available data are sufficiently representative. Our objective was to evaluate the feasibility of mapping cetacean densities across the entire Mediterranean Sea using models calibrated on available survey data and various environmental covariates. We aggregated 302,481 km of line transect survey effort conducted in the Mediterranean Sea within the past 20 years by many organisations. Survey coverage was highly heterogeneous geographically and seasonally: large data gaps were present in the eastern and southern Mediterranean and in non-summer months. We mapped the extent of interpolation versus extrapolation and the proportion of data nearby in environmental space when models calibrated on existing survey data were used for prediction across the entire Mediterranean Sea. Using model predictions to map cetacean densities in the eastern and southern Mediterranean, characterised by warmer, less productive waters, and more intense eddy activity, would lead to potentially unreliable extrapolations. We stress the need for systematic surveys of cetaceans in these environmentally unique Mediterranean waters, particularly in non-summer months. PY 2018 PD FEB SO Scientific Reports SN 2045-2322 PU Nature Publishing Group VL 8 UT 000425190500030 DI 10.1038/s41598-018-19842-9 ID 73789 ER EF