The localized hybridization betweenOrchis mascula and O. provincialis in Sardinia isinvestigated. The two parental species are closelyrelated and share the same pollinators but do nothybridize in any other areas of sympatry. Artificialcrosses between the two species in areas of sympatryon the continent revealed that, in absence of anethological isolation, a strong post-pollinationbarrier exists and preserves species integrity in themain part of their distribution. However, onSardinia, morphological observations, karyologicaland molecular analyses of intermediate phenotypesconfirmed the occurrence of hybridization betweenthe insularO.mascula ssp. ichnusae and O. provincialisand the bi-directionality of pollen flow. The occurrenceof hybrids on the island indicates a failure ofotherwise strong post-pollination barriers betweenO. mascula and O. provincialis.

Confirmation of hybridization among sympatric insular populations of Orchis mascula and O. provincialis

PELLEGRINO, Giuseppe
;
MUSACCHIO, Aldo;
2005-01-01

Abstract

The localized hybridization betweenOrchis mascula and O. provincialis in Sardinia isinvestigated. The two parental species are closelyrelated and share the same pollinators but do nothybridize in any other areas of sympatry. Artificialcrosses between the two species in areas of sympatryon the continent revealed that, in absence of anethological isolation, a strong post-pollinationbarrier exists and preserves species integrity in themain part of their distribution. However, onSardinia, morphological observations, karyologicaland molecular analyses of intermediate phenotypesconfirmed the occurrence of hybridization betweenthe insularO.mascula ssp. ichnusae and O. provincialisand the bi-directionality of pollen flow. The occurrenceof hybrids on the island indicates a failure ofotherwise strong post-pollination barriers betweenO. mascula and O. provincialis.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.11770/144877
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