How do Robins Erithacus rubecula resident in Iberia respond to seasonal flooding by conspecific migrants?

Figures & data

Table 1. Location, main habitat, and sampling period in each of the Constant Effort Sites (CES) included in this study.

Local	Location	Altitude (m a.s.l)	Main habitat	Sampling period
Margaraça	40° 12'N, 07° 55'W	500–600	Deciduous forest	March 2003–July 2007
Gaia	41° 05'N, 08° 33'W	60	Suburban park	October 2006–October 2009
Madriz	40° 07'N, 08° 38'W	25	Wetland margin	January 2004–July 2007
Azóia	40° 06'N, 08° 41'W	30	Abandoned Orchards	March 2002–July 2007
Tornada	39° 26'N, 09° 08'W	24	Wetland margin	January 2003–June 2007

Figure 1. Monthly variation in the numbers (mean ± sd) of Robins mist-netted at the two Constant Effort Sites (CES) with larger numbers of captures. Totals include both new captures and recaptures of birds ringed on previous occasions. Data from four years pooled. (a) Margaraça, (b) Madriz.

Table 2. Numbers of individual Robins captured at five Constant Effort Sites (CES) and classified in each phenological category. Figures in brackets represent numbers of sexed individuals (male : female). Male and female numbers do not add to total in categories because many individuals were not sexed.

CES	Sedentary	Spring–single	Spring–return	Winter–single	Winter–return	Uncertain
Margaraça	9 (4 : 1)	10 (3 : 5)	8 (3 : 2)	31	8	1
Gaia	7 (1 : 1)	0	2	4	2	1
Madriz	9 (2 : 3)	2 (0 : 1)	5 (2 : 3)	11	0	1
Azóia	3 (1 : 2)	2 (1 : 1)	2 (0 : 2)	6	4	1
Tornada	6 (3 : 1)	1 (0 : 1)	0	8	4	2
Total	34 (11 : 8)	15 (4 : 8)	17 (5 : 7)	59	18	6

Figure 2. Frequency of isotopic signatures of Robins (feathers) at Margaraça in (a) spring (June) and (b) winter (January) and (c) during autumn migration at Falsterbo, Southern Sweden.