Abstract
Podda, L., Fraga i Arguimbau, P., Mayoral Garcia-Berlanga, O., Mascia, F. & Bacchetta, G. 2010. Comparison of the vascular exotic flora in continental islands: Sardinia (Italy) and Balearic Islands (Spain). Anales Jard. Bot. Madrid 67(2): 157-176 (in Spanish). This paper provides a comparison of the vascular exotic flora of Sardinia and that of the Balearic Islands, both territories belonging to the Western Mediterranean biogeographic subregion. The study has recorded 531 exotic taxa in Sardinia (18.8% of the total flora) while 360 (19%) in the Balearic Islands; 10 are new to Sardinia (3 of which for Italy) and 29 to the Balearic Islands. The alien flora of Sardinia is included in 99 families; Fabaceae is the richest (49 taxa), followed by Poaceae (33) and Asteraceae (31) while in the Balearic Islands in 90 families, with a predominance of Fabaceae (32), Asteraceae (31) and Poaceae (27). The comparison of the biological spectra reveals that in Sardinia phanerophytes are the most represented in Sardinia and therophytes in the Balearic Islands. A detailed analysis shows that most of the exotic taxa (246) are shared by both territories with a clear dominance of neophytes rather than archaeophytes. A study of the geographical origin shows supremacy of the American element over the Mediterranean. The majority of introduced exotic taxa are a result of intentional human introductions (76% SA, 77% BL), mainly for ornamental use (43% SA, 45% BL). The most occupied habitats are the semi-natural, agricultural and synanthropic for both territories, but attending to invasive plants, coastal habitats in Sardinia and wetlands in the Balearic Islands are the most sensitive. A part of the work deals with the causes of fragility and low resilience of the different habitats.
Highlights
Los estudios comparativos relativos a la flora exótica, desarrollados en territorios próximos y relacionados desde el punto de vista biogeográfico, adquieren particular importancia en islas, tanto oceánicas como continentales (Crawley & al., 1996; Fritts & Rodda, 1998; Cox, 1999; Sherley, 2000; Clout & Veitch, 2002; Hernández & al., 2002; Daehler & al., 2004; Kueffer, 2006)
Recientemente, Bacchetta & al. (2009b) realizan un catálogo florístico de la flora exótica de Cerdeña y comparan la misma con el conjunto de la flora vascular de la isla
Este tipo de comparaciones conlleva dificultades debido a la heterogeneidad de los datos, en ocasiones incompletos o significativamente diferentes en cuanto al formato y metodología empleados
Summary
Los estudios comparativos relativos a la flora exótica, desarrollados en territorios próximos y relacionados desde el punto de vista biogeográfico, adquieren particular importancia en islas, tanto oceánicas como continentales (Crawley & al., 1996; Fritts & Rodda, 1998; Cox, 1999; Sherley, 2000; Clout & Veitch, 2002; Hernández & al., 2002; Daehler & al., 2004; Kueffer, 2006). Para Cerdeña, el porcentaje mayor de especies invasoras en los hábitats más sensibles se da en los ecosistemas litorales (24%; 11 táxones), seguido de las zonas húmedas (15%; 8), hábitats arbustivos (11%; 2), riparios (10%; 4), agrícolas-rurales (10%; 14) y sinantrópicos (10%; 14).
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