Figure 2
From: Age-dependent carry-over effects in a long-distance migratory bird
Temporal trend in NDVI extracted from the previously defined wintering areas during the period 1982–2013 (pixels that were assigned to be the likely origin for >60% of our sample; see Fig. 1H). Points represent average NDVI from November (year “i-1”) to March (year “i”). Average NDVI values were obtained from bimonthly data developed by ECOCAST (available at https://ecocast.arc.nasa.gov/data/pub/gimms/3g.v0/). NA pixels within this dataset were filled with package gapfill74 in R. The continuous line indicates the predicted NDVI values given by the linear model fitted with NDVI as a function of year using Ordinal Least Squares.
