Table 1. Subareas (letters indicate corresponding sectors in Fig 1), listed in chronological order of survey timing, with subarea surfaces and transect lengths (on average over 90% of the planned transect length was covered).
Rows with bold lettering correspond to summer surveys, which were used for density and spatial analyses.
| Sub-areas | Year | Season | Period (days flown) | Total surface (km2) | Planned transect length (km) | Surveyed transect length (km) |
|---|---|---|---|---|---|---|
| Pelagos Sanctuary (A) | 2009 | Winter | 11 Jan– 22 Feb (20) | 88,267 | 8,852 | 8,013 |
| Pelagos Sanctuary (A) | 2009 | Summer | 20 Jul– 3 Aug (12) | 88,267 | 8,852 | 8,502 |
| Ionian Sea (E) | 2010 | Spring | 28 Apr– 14 May (12) | 97,326 | 6,574 | 5,999 |
| Pelagos Sanctuary (A), Sardinian Sea (B), Central Tyrrhenian Sea (C) | 2010 | Summer | 16 Jun– 4 Jul (14) | 236,272 | 15,871 | 15,229 |
| Southern Tyrrhenian Sea (D) | 2010–2011 | Autumn—Winter | 21–27 Oct (5), 13–20 Jan (7) | 111,147 | 7,408 | 5,723 |
| Central Tyrrhenian Sea | 2013 | Summer | 1–8 Aug (8) | 93,216 | 5,930 | 6,211 |
| Southern Tyrrhenian Sea (D) | 2014 | Winter | 7–16 Jan (10) | 111,147 | 7,408 | 6,141 |