The conservation of the endemic vascular flora of Ascension Island and threats from alien species

Autor:	Stedson Stroud, Tara Pelembe, Alan Gray
Rok vydání:	2005
Předmět:	Anogramma ascensionis Near-threatened species biology Ecology Endangered species Zoology Introduced species biology.organism_classification Critically endangered IUCN Red List Euphorbia origanoides Sporobolus Ecology Evolution Behavior and Systematics Nature and Landscape Conservation
Zdroj:	Oryx. 39:449
ISSN:	1365-3008 0030-6053
DOI:	10.1017/s0030605305001092
Popis:	We present the first assessment of the endemic vascular flora of Ascension Island for over 20 years. Combining new with existing data the following IUCN Red List categorizations are proposed: Anogramma ascensionis, Dryopteris ascensionis, Oldenlandia adscensionis and Sporobolus durus (Extinct); Pteris adscensionis and Euphorbia origanoides (Critically Endangered); Sporobolus caespitosus (Vulnerable); Asplenium ascensionis, Marattia purpurascens and Xiphopteris ascensionensis (Near Threatened). The primary cause of the four presumed extinctions appears to be introductions of exotic species and subsequent alteration of ecological conditions. M. purpurascens, A. ascensionis, and X. ascensionensis appear to be under no immediate threat of extinction, although long-term survival is uncertain. E. origanoides, P. adscensionis, and S. caespitosus require active conservation measures to ensure their survival.
Databáze:	OpenAIRE
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