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Plant Sociology numero 52 (1)

pag. 3-8: Contribution to the knowledge of the edaphoxerophilous communities of the Samana Peninsula (Dominican Republic)

E. Cano1, A. Cano-Ortiz2, A. Veloz3

1Departamento Biología Animal, Vegetal y Ecología. Botánica. Universidad de Jaén. Paraje las Lagunillas s/n, ES-3071 Jaén, España.

2Departamento Sostenibilidad Interra. Ingeniería y Recursos SL. Plaza España, 317,5 ES-27004 Salamanca, España.

3Jardín Botánico Rafael Ma. Moscoso de Santo Domingo. República Dominicana.

doi: 10.7338/pls2015521/01

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abstract

The Samana Peninsula belongs to the biogeographical North Sector of the Caribbean-Atlantic Subprovince (Hispaniola Province, Caribbean-Mesoamerican Region). In the past the Peninsula was separated from the rest of Hispaniola but today it is joined by a small strip of land made up of Quaternary sediments in the Gran Estero. Rainfall records are as high as 2,339 mm. The Io value is 7.3 (i.e., humid ombrotype) and Ti/Tic values are 741/675. These conditions give rise to an infratropical thermotype. The Samana Peninsula forms a geomorphological unit dominated by karstic materials, limestones, schists and marls. Despite the heavy rainfall rates, the presence of escarpments (farallones) gives rise to an edaphoxerophilous community. Species such as Pilosocereus polygonus, Zamia debilis, Agave antillarum, Eugenia samanensis, Bursera simaruba, Capparis fexuosa, Ficus velutina, Opuntia dellinii, Comocladia dodonaea, Stigmaphyllum emarginatum are not infrequent in this plant community. This edaphoxerophilous community is rich in endemic species and is dominated by Coccotrinax gracilis, Agave antillarum, Leptocereus weingartianus and, to a lesser extent, by Eugenia samanensis. The presence in the peninsula of 134 endemic species justifies considering this a biogeographical territory (A4) within the North Sector (Cano et al., 2010).

keywords

association, edaphoxerophilous, flore, vegetation