Table 1. Case studies, and associated references, for regularized estimation of population trends of cetacean species in European waters.

The column “Design” refers to the design of the data collection scheme: Distance Sampling (DS) or Capture-Mark-Recapture (CMR). The vaquita is included for illustrative purposes (see also Supplemental Materials).

Species	Scientific name	Period	Area	Season	Sample size	Design	References
Fin whale	Balaneoptera physalus	2007–2016	Wider Bay of Biscay	Autumn	6	DS	García-Barón et al. (2019)
Minke whale	Balaneoptera acutorostrata	2004–2016	Bay of Biscay	Spring	13	DS	Authier et al. (2018)
		1989–2016	North Sea	Summer	10	DS	ICES (2017)
Risso’s dolphin	Grampus griseus	2004–2016	Bay of Biscay	Spring	13	DS	Authier et al. (2018)
Long-finned pilot whale	Globicephala melas	2004–2016	Bay of Biscay	Spring	13	DS	Authier et al. (2018)
Bottlenose dolphin	Tursiops truncatus	2004–2016	Bay of Biscay	Spring	13	DS	Authier et al. (2018)
		2005–2016	Wider bay of Cardigan	Year-round	12	CMR	Lohrengel et al. (2018)
		2010–2017	Gulf of Saint Malo	Year-round	8	CMR	Grimaud, Galy & Couet (2019)
Common dolphin	Delphinus delphis	2004–2016	Bay of Biscay	Spring	13	DS	Authier et al. (2018)
		2007–2016	Iberian Coasts	Spring	10	DS	Saavedra et al. (2018)
Striped dolphin	Stenella coeruleoalba	2004–2016	Bay of Biscay	Spring	13	DS	Authier et al. (2018)
White-beaked dolphin	Lagenorhynchus albirostris	1994–2016	North Sea	Summer	3	DS	Hammond et al. (2017)
Harbour porpoise	Phocoena phocoena	1994–2016	North Sea	Summer	3	DS	Hammond et al. (2017)
Vaquita	Phocoena sinus	1997–2016	Sea of Cortez	Summer	4	DS	Taylor et al. (2017)