Hybridization between the Yellow Cardinal (Gubernatrix cristata) and the Common Diuca Finch (Diuca diuca minor) in the wild in Argentina

Abstract

Two intergeneric hybrids between the Yellow Cardinal (Gubernatrix cristata) and the Common Diuca Finch (Diuca diuca minor) are described. The hybrids were captured in the area of sympatry between Gubernatrix cristata and Diuca diuca in E Río Negro Province (Argentina), where they are locally named «Plomitos». Other 15 hybrid specimens are reported from localities in SE La Pampa, S Buenos Aires and E Río Negro Provinces. A bird breeder was able to cross both species and obtained hybrids in captivity; thus making it clear that the similar birds described here represent a phenomenon of hybridization. We believe that hybridization was «triggered» by the capture of more males than females Gubernatrix cristata for the illegal pet trade. The hybrids are viable, but their degree of fertility is unknown: We suggest: a) to investigate captive breeding programs b) to carry out genetic analyses of the hybrids in order to obtain data on the taxonomic relationship of the parent taxa; e) to undertake field studies in the zone of hybridization to determine the ecological relationships between these two species and to assess the possible effects of this hybridization on Gubernatrix, a species currently classified as threatened.