Fig. 2
[The background maps in a and b made were made from data available from the U.S. Geological Survey (http://www.usgs.gov/); maps were created in ArcMap 10.1 (http://www.esri.com/)]
Annual differences in weather conditions and the corresponding migration phenology of semi-collared flycatchers. Land surface temperatures (°C) from 22 March–7 April in a 2014 and b 2015. c Leaf area index (m2 of leaf area per m2 ground area) progression from 6 February–1 May at the flycatcher’s breeding site in 2014 (orange) and 2015 (blue) and the related flycatcher migration phenology in each year, including (D) departure from the non-breeding site, (S) Sahara crossing, and (A) arrival at the breeding site. d Stopover duration north of the Sahara in relation to leaf area index at the breeding site at the time of Sahara crossing