Habitat differentiation and geographic separation of "Isoetes velata" populations in central Iberian Peninsula

  1. Molina, José Antonio 1
  1. 1 Universidad Complutense de Madrid
    info

    Universidad Complutense de Madrid

    Madrid, España

    ROR 02p0gd045

Journal:
Botanica complutensis

ISSN: 0214-4565

Year of publication: 2021

Issue: 45

Pages: 127-134

Type: Article

DOI: 10.5209/BOCM.75525 DIALNET GOOGLE SCHOLAR lock_openOpen access editor

More publications in: Botanica complutensis

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Abstract

Populations of "Isoetes velata" were studied in order to provide more information on their habitat and distribution in the Western and Northwestern Iberian Peninsula. Habitat together with morphology of megaspores were used as diagnostic features. The form I. velata subsp. velata f. lereschii is considered here as a synonym of I. velata subsp. asturicense and therefore only two taxa remain within the species: I. velata subsp. velata and I. velata subsp. asturicense. Intermediate individuals have been found in the Western Central System. The differentiation within the I. velata group appears to be the result of gradual genetic divergence after isolation. Palaeobotanical data confirm the presence of I. velata subsp. asturicense in Late Glacial lake sediments in northwestern Spain. Cluster classification of the soft-water vegetation with Isoetes velata subsp. asturicense revealed two main groups in the Spanish Central System. A single association, the Sparganio angustifolii-Callitrichetum fontqueri which includes Iberian Atlantic stands of Sparganium angustifolium and Isoetes velata subsp. asturicense, is here recognized. Besides, a variant of the association with Eleocharis acicularis is identified in shallow temporary waters in the Western Sierra de Gredos.

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Funding information

I would like to thank to Salvador Rivas-Mart?nez and Carmen Prada for their valuable comments on the manuscript.

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