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Location of the Portuguese study areas: (A) 1.5 ha vineyard parcel, belonging to Quinta do Vallado, Peso da Régua, Portugal; (B) 2 ha vineyard parcel, in Lousada, Porto, Portugal; and (C) 5 ha coastal area, located in Viana do Castelo, Portugal. Images from Google Earth (accessed on 18 December 2020).
