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L’escalfament global i l’extinció de les plantes: un exemple tropical

AuthorsSafont, Elisabet ; Rull, Valentí ; Vegas-Vilarrúbia, Teresa ; Nogué, Sandra
Issue Date2011
PublisherMuseu Comarcal del Maresme
CitationL´Atzavara 20: 29-42 (2011)
Abstract[EN]Global warminG and plant extinction: a tropical example. – Pantepui is a phytogeographical province made up of a group of approximately 50 tabular mountain summits or tepuis in southeast Venezuela. This region lies between 1500 and 3014 m a.s.l and covers an approximate area of 6000 km2. Its pristine state of conservation is remarkable. The summits of the tepuis contain an excep- tional level of vascular plant diversity, including 2446 known species, of which 771 are endemic to Pantepui. It is expected that the ongoing effects of global warming will produce upward displace- ments of summit taxa, which could result in the extinction of certain species due to habitat loss. This study is an assessment of the potential extinction risk during the 21st century due to global warming. In order to determine those species that will potentially become extinct during each time frame (2011-2030, 2046-2065 and 2080-2099), we used Altitudinal Range Displacement (ARD) analysis and different scenarios to forecast expected temperatures, as predicted by the Intergov- ernmental Panel on Climate Change (IPCC). The ARD results revealed that at least 169, and up to 321, endemic species would lose their habitat by the end of this century based on the more con- servative and pessimistic scenarios, respectively. In light of these results, a number of in situ and ex situ conservation alternatives are discussed. In situ conservation by means of protected areas does not appear be a viable option because of the upward habitat displacement that would occur. Conversely, ex situ conservation techniques (seed or pollen banks, in vitro culture, collections un- der cultivation, etc.) have great potential to preserve the species discussed herein.
Description14p.; Grafs.; Fots. col.
Publisher version (URL)http://www.scn-mm.cat/atzavara/pdfs/atz20029.pdf
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