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Titolo:
In search of the optimal management strategy for Arabian oryx
Autore:
Treydte, AC; Williams, JB; Bedin, E; Ostrowski, S; Seddon, PJ; Marschall, EA; Waite, TA; Ismail, K;
Indirizzi:
Ohio State Univ, Dept Ecol Evolut & Organismal Biol, Columbus, OH 43210 USA Ohio State Univ Columbus OH USA 43210 nismal Biol, Columbus, OH 43210 USA Natl Commiss Wildlife Conservat & Dev, Natl Wildlife Res Ctr, At Taif, Saudi Arabia Natl Commiss Wildlife Conservat & Dev At Taif Saudi Arabia Saudi Arabia
Titolo Testata:
ANIMAL CONSERVATION
, volume: 4, anno: 2001,
parte:, 3
pagine: 239 - 249
SICI:
1367-9430(200108)4:<239:ISOTOM>2.0.ZU;2-T
Fonte:
ISI
Lingua:
ENG
Soggetto:
LARGE HERBIVORES; FLUCTUATING POPULATIONS; DENSITY-DEPENDENCE; DYNAMICS; DESERT; RAINFALL; OMAN; CONSEQUENCES; CONSERVATION; ECOSYSTEMS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
70
Recensione:
Indirizzi per estratti:
Indirizzo: Williams, JB Ohio State Univ, Dept Ecol Evolut & Organismal Biol, 1735 Neil Ave, Columbus, OH 43210 USA Ohio State Univ 1735 Neil Ave Columbus OH USA43210 43210 USA
Citazione:
A.C. Treydte et al., "In search of the optimal management strategy for Arabian oryx", ANIM CONSER, 4, 2001, pp. 239-249

Abstract

Extirpated from the wild in 1972 by overhunting, Arabian oryx (Oryx leucoryx) were re-introduced in Saudi Arabia in March 1990; 17 oryx were releasedinto Mahazat as-Sayd, a 2244 km(2) fenced reserve in west-central Arabia, which lies at the periphery of their historical home range. The population has increased to 346 animals. The National Commission for Wildlife Conservation and Development. and those that manage the herd, have recently asked, 'What is the optimal management strategy to assure long-term persistence ofthe species, given the absence of immigration and predation? ' Food resources, determinants of rates of mortality and birth, covary with unpredictablerainfall in Mahazat as-Sayd. Using data-driven assumptions, we developed acomputer model that evaluated the probability of extinction (P-ex) under various management strategies: no intervention, removing a fixed number of animals each year, removing a fixed percentage of animals each year, and removing all individuals above a threshold. In addition, we explored the probability that oryx populations would decline below two thresholds, called theprobability of quasi-extinction (Pq-ex) under various management schemes. Our analyses suggested that, without intervention, the oryx population had a high P-ex, Removing 15% of the current population provided a low P-ex, but this method also produced high values for Pq-ex and, as a by-product, wide fluctuations in population size (N). Although it required an assessment of both N and carrying capacity (K), the most successful management plan consisted of removing all oryx above 70% of K. Adoption of this plan resulted in low P-ex, low Pq-ex, and smaller fluctuations in N. Our study may provide a useful model for evaluating management plans for a variety of threatened animal populations in desert ecosystems.

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Documento generato il 01/04/20 alle ore 23:39:38