Journal Article 3 growing degree day Danaus plexippus 2 Poisson regression model 1 Research Support, Non-U.S. Gov't 1 breeding habitat 1 climate projections 1 mehr ... full-annual-cycle model 1 leaf onset date 1 monarch butterfly 1 palmer drought index 1 phenology 1 phenology model 1 plant phenology 1 population forecasts 1 return migration 1 terrestrial biosphere model 1 winter chilling 1 weniger ...