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Effects of the management regime on the performance of the endangered Mediterranean Centaurea horrida Badarò (Asteraceae)

Farris, Emmanuele and Pisanu, Stefania and Ceccherelli, Giulia and Filigheddu, Rossella Speranza (2009) Effects of the management regime on the performance of the endangered Mediterranean Centaurea horrida Badarò (Asteraceae). Journal for Nature Conservation, Vol. 17 (1), p. 15-24. ISSN 1617-1381. Article.

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DOI: 10.1016/j.jnc.2008.10.002

Abstract

The Mediterranean Basin, possessing 4.3% of all plants of the world, is considered one of the biodiversity hotspots at global scale. Several forms of impact on biodiversity are currently taking place in European Mediterranean countries as a result of the abandonment of traditional extensive production systems in areas of particular value for nature conservation.
In this study we investigated the effects of the cessation of agro-sylvo-pastoral activities on Centaurea horrida Badarò, a very rare sea-cliff plant, endemic to North-Western Sardinia (Italy) and listed by the IUCN as vulnerable. In a similar way to other cliff species, Centaurea horrida can expand its range when unsuitable surrounding habitats are disturbed. The analysis of aerial photos indicates that about 88.5% of a surface previously occupied by a Centaurea horrida dwarf community was replaced by juniper scrub over a 50-year period. In the juniper scrub Centaurea horrida density is at present 1/5 of that observed in the dwarf community. The spatial distribution of Centaurea horrida individuals was not random but concentrated in open microhabitats, more abundant in the dwarf community than in the juniper scrub. Juveniles were found mainly on bare soil; this being the only microhabitat where seedling emergence may occur. Furthermore, disturbance had a positive effect on the survival rates of saplings. Our data show that Centaurea horrida is a species that is linked to the initial stages of secondary succession, when patches of bare soil are available, but it is non-competitive with the late-succession species of the juniper scrub. Active management practices to maintain Centaurea horrida populations are therefore proposed and discussed.

Item Type:Article
ID Code:1529
Status:Published
Refereed:Yes
Uncontrolled Keywords:Biodiversity hotspots, habitats directive, land-use change, Mediterranean insular ecosystems, sea cliffs, secondary succession
Subjects:Area 05 - Scienze biologiche > BIO/07 Ecologia
Area 05 - Scienze biologiche > BIO/03 Botanica ambientale e applicata
Area 05 - Scienze biologiche > BIO/02 Botanica sistematica
Divisions:001 Università di Sassari > 01 Dipartimenti > Scienze botaniche, ecologiche e geologiche
Publisher:Urban & Fischer / Elsevier
ISSN:1617-1381
Copyright Holders:© 2008 Elsevier
Deposited On:18 Aug 2009 10:05

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