NDLI: Population genetic suggestions to offset the extinction ratchet in the endangered Canarian endemic Atractylis preauxiana (Asteraceae)

Content Provider	Springer Nature Link
Author	Caujapé Castells, Juli Naranjo Suárez, José Santana, Isabel Baccarani Rosas, Mario Cabrera García, Nereida Marrero, Manuel Carqué, Eduardo Mesa, Ricardo
Copyright Year	2008
Abstract	We examined the levels and apportionment of genetic variation of the 11 known subpopulations of Atractylis preauxiana at 95 RAPD loci to help streamline a conservation strategy for this Canarian endemic taxon, which is in a critical situation because of the constant exposure of plants to intensive, uncontrolled anthropic action in the last few decades. Our results revealed low genetic variation levels that match with the general picture of demographic and habitat degradation that this taxon is undergoing. Although geographic isolation between Tenerife and Gran Canaria is an effective barrier to gene flow, genetic heterogeneity within islands is also substantial, plausibly due to the negative impact of fragmentation on genetic variation. Our genetic results, together with declining population sizes, poor seedling survival, and recent population extinctions, compellingly indicate that A. preauxiana is undergoing an extinction ratchet, whereby every further local extinction will add up to the probability of total species’ extinction. Our genetic results suggest that mitigating the deleterious consequences of this effect entails urgent mixed reinforcements of all sub-populations with sub-populations from the same island and urgent translocation of the two sub-populations from Tenerife that are doomed to extinction to ecologically suitable areas, together with seed collection and preservation in a convenient ex situ banking facility.
Starting Page	191
Ending Page	199
Page Count	9
File Format	PDF
ISSN	03782697
Journal	Plant Systematics and Evolution
Volume Number	273
Issue Number	3-4
e-ISSN	16156110
Language	English
Publisher	Springer Vienna
Publisher Date	2008-05-20
Publisher Place	Vienna
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Atractylis preauxiana Canary Islands Endemic RAPDs Conservation Fragmentation Extinction Plant Systematics/Taxonomy/Biogeography Plant Anatomy/Development Plant Ecology Plant Sciences
Content Type	Text
Resource Type	Article
Subject	Plant Science Ecology, Evolution, Behavior and Systematics

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