Table 2.

Monitoring period (years in bold = ongoing monitoring), sampling regime, and within season survey effort for gyrfalcons

Site IDa	Monitoring site	Occupancy based on presence ofb	Survey periodc	Sampling regimed		Platform	Pre-laying	Incubation	Brood rearing	Occupancy estimatef
1	Norrbotten (Se)	Adult(s), egg/young	1997–2018	Stratified	Full/partial	Ground, air		✓e	✓	(X + Y + Z + G)/N
2	Finnmark (No)	Adult(s), egg/young, other evidence	2000–2018	Census	Full	Air, ground		✓	✓	(X + Y + Z + G)/N
3	Lapland (Fi)	Adult(s), egg/young, other evidence	1990–2018	Census	Full	Ground, air		✓	✓	(X + Y + Z + G)/N
4	Kola Peninsula (Ru)	Adult(s), egg/young, other evidence	2007–2018	Census	Partial	Ground			✓	(X + Y + Z + G)/N
7	Schuchya River (Ru)	Adult(s), egg/young	2006–2016	Census	Partial	Ground			✓	(X + Y)/N
10	Seward Peninsula (US)	Adult(s), egg/young	1998–2018	Census	Fulle	Air, ground		✓e	✓	(X + Y + Z + G)/N
11	Denali Nat. Park (US)	Adult(s), egg/young	2006–2018	Census	Full	Air, ground		✓	✓
12	South Yukon (Ca)	Adult(s), egg/young	1981–2018	Random	Partial	Air			✓	(X + Y + Z + G)/N
13	Colville River (US)	Adult(s), egg/young	1981–2018	Census	Partial	Ground			✓	(X + Y + Z + G)/N
16	North Slope Yukon (Ca)	Adult(s), egg/young	1974–2015	Random	Partial	Air			✓	(X + Y + Z + G)/N
18	Hope Bay (Ca)	Adult(s), egg/young	1982–1991	Census	Partial	Ground			✓	(X + Y + Z + G)/N
21	Northwest Greenland	Adult(s), egg/young	1993–2018	Census	Partial	Air, ground			✓	(X + Y + Z + G)/N
22	Central West Greenland	Adult(s), egg/young	1972–2005	Census	Partial	Air, ground			✓	(X + Y + Z + G)/N
24	Northeast Iceland	Adult(s), egg/young, other evidence	1981–2018	Census	Full	Ground		✓	✓	(X + Y + Z + G)/N

^aSee Fig. 3

^bOther evidence—egg shell fragments, molted feathers or down, recent excrement, fresh prey remains

^cBold indicates monitoring is ongoing

^dCensus—all known nesting territories checked systematically; stratified—sub-set of all known nesting territories checked systematically; random—random selection of known nesting territories checked; full—known nesting territories receive multiple visits per breeding season; partial—single visits, or only in brood-rearing period

^eDiscontinuous

^fX = successful nest, nesting attempt, or pair—one in which at least one young reaches the minimum acceptable age for assessing success (Steenhof et al. 2017), Y = unsuccessful nest, nesting attempt, or pair—a laying pair that failed before nestlings reached the minimum acceptable age for assessing success, Z = non-laying Pair—a mated pair that fails to lay at least 1 egg in a given year (Steenhof et al. 2017), G = single non-laying individual—a non-mated individual evidenced by an absence of territorial behavior, or reproductive-related activity, N = Count of known nesting territories surveyed