Based on 120 linear transects in riparian forests of Castilla y León and using song as the means of differentiating the species, we have confirmed the presence during the breeding season of the two breeding chiffchaff taxa recognised in western Europe, Iberian chiffchaff (Phylloscopus brehmii) and European chiffchaff (P. collybita). In this area these species show a certain segregation due to geographical factors. P. collybita occurs mainly in the central part of the Duero plain and in the Sistema Central, including its southern slope, although it is always scarce and dispersed. In these areas, mainly formed by open habitats, it is restricted to high and dense riparian forest. P. brehmii is mainly present in the mountain and premountain areas of northern Castilla y León (Cordillera Cantábrica and El Bierzo) where apparently P. collybita is extremely rare. In these areas P. brehmii usually has high abundance levels, is not restricted to riparian forest and is also present in other non riparian forests. It is also found in some areas of the central part of the region, generally in areas near the Cordillera Cantábrica where it coexists with P. collybita.
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