Contribución para la caracterización florístico-ambiental del Norte de Portugal

Abstract

Several specific and infraspecific taxa with different occurrences in the continental portuguese area are referred in the present work. In the light of these behaviours, the climatic and geomorphological variability of the North of Portugal has been important environmental factors to explain the floristic diversity in this part of the country. In this case, the taxa analysed are Teucrium salviastrum Trigonella polyceratia subsp. amandiana, Ononis viscosa subsp. breviflora var. breviflora, Ononis viscosa subsp. pedroi, Digitalis amandiana, Myosotis welwistchii and Myosotis secunda. Because of the appropriate management of the floristic richness, a multivariate statistic routine is applied on a Geographical Informatic System (GIS) the chorological, geomorphological and climatic characterization for each one are described in this paper. The geological substrate and the altitudinal classes are focused for the geomorphological approach, as well as two biogeographic classifications are used to correlate the occurrence of the taxa and their bioclimatic preferences. In the light of this analytical scheme, every taxa is geo-referenced upon an environmental cartography (elaborated by the Instituto para a Conservação da Naturaza). The results obtained are pointing out the floristic progressive differentiation between the atlantic bioclimatic influence and the mediterranean one, both bioclimatic influences decisive to understand the floristic behaviour of the North of Portugal.