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Open Access item Comparative ﬂoral and vegetative diﬀerentiation between two European Aquilegia taxa along a narrow contact zone
Castellanos, María Clara
Herrera, Carlos M.
|Keywords:||Aquilegia pyrenaica subsp. cazorlensis, Aquilegia vulgaris subsp. vulgaris, ﬂoral character, Iberian Peninsula, inter- and intraspeciﬁc variation, morphological diﬀerentiation, Ranunculaceae, vegetative character|
|Citation:||Plant Systematics and Evolution. 262: 209–224 (2006)|
|Abstract:||As a ﬁrst step in determining the identity and relative importance of the evolutionary forces promoting the speciation process in two closely related European taxa of Aquilegia, we investigated the levels of morphological variation in ﬂoral and vegetative characters over the narrow region where their ranges enter into contact, and evaluate the relative importance of both types of traits in their diﬀerentiation. A total of 12 ﬂoral and ten vegeta- tive characters were measured on 375 plants belonging to seven A. vulgaris populations and six A. pyrenaica subsp. cazorlensis populations located in southeastern Spain. Floral and vegetative mor- phological diﬀerentiation occur between taxa and among populations within taxa, but only vegetative characters (particularly plant height and leaf pet- iolule length) contribute signiﬁcantly to the dis- crimination between taxa. Diﬀerentiation among populations within taxa is mostly explained by variation in ﬂoral traits. Consequently, morpho- logical divergence between the two taxa cannot be interpreted as an extension of among-population diﬀerences occurring within taxa. Multivariate vegetative, but not ﬂoral, similarity between pop- ulations could be predicted from geographical distance. Moreover, the key role of certain vegeta- tive traits in the diﬀerentiation of A. vulgaris and A. p. cazorlensis could possibly be attributable to the contrasting habitat requirements and stress tolerance strategies of the two taxa. These pre- liminary ﬁndings seem to disagree with the
currently established view of the radiation process in the genus Aquilegia in North America, where the diﬀerentiation of ﬂoral traits seems to have played a more important role.|
|Publisher version (URL):||http://www.springerlink.com/content/158171l044u325j8/fulltext.pdf|
|Appears in Collections:||(EBD) Artículos|
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