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Fig. 2 | BMC Ecology

Fig. 2

From: Cold spell en route delays spring arrival and decreases apparent survival in a long-distance migratory songbird

Fig. 2

[The background maps in a and b made were made from data available from the U.S. Geological Survey (; maps were created in ArcMap 10.1 (]

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

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