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Scientists create new overwintering sites for monarch butterflies on a warming planet

Planting Abies religiosa (Sacred fir) seedlings under the shade of pre-existing shrubs (Senecio cinerarioides, narrow green-grayish foliage) as protective “nurse plants”. Large trees on background are adult Pinus hartwegii, the pine that reaches the timberline. Abies religiosa is completely absent in this site at 3800 m of elevation, northeaster slope of Nevado de Toluca volcano, […]