Is the collection of Aloe peglerae from the wild sustainable? An evaluation using stochastic population modelling

Pfab, M.F.; Scholes, Mavis A.

doi:10.1016/j.biocon.2003.10.018

Cited by 34 publications

(25 citation statements)

References 26 publications

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“…Aloe succotrina was recorded as an ornamental in Europe as early as 1697 (Pole-Evans 1919) and the genus continues to interest plant collectors today (Rowley 1976;De Wet 1996). Indiscriminate collecting for horticulture is of particular concern regarding threatened species including the endangered A. peglerae Schönland (Pfab and Scholes 2004) and the Lesotho endemic, A. polyphylla Schönland (Marshall 1998). …”

Section: Methodsmentioning

confidence: 99%

Documented Utility and Biocultural Value of Aloe L. (Asphodelaceae): A Review

et al. 2009

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Documented Utility and Biocultural Value of Aloe L. (Asphodelaceae): A Review. The genus Aloe L. (Asphodelaceae) comprises 548 accepted species, of which at least one-third are documented as having some utilitarian value. The group is of conservation concern due to habitat loss and being extensively collected from the wild for horticulture and natural products. Cultural value is increasingly important in the effective conservation of biodiversity. The present study evaluated the biocultural value of the known uses of Aloe, excluding the domesticated and commercially cultivated A. vera. Over 1,400 use records representing 173 species were collated from the literature and through personal observation; this paper presents a synopsis of uses in each of 11 use categories. Medicinal uses of Aloe were described by 74% of the use records, followed by social and environmental uses (both 5%). Species yielding natural products, notably A. ferox and A. perryi, were most frequently cited in the literature. Consensus ratios indicate that the most valued uses of Aloe are in medicine and pest control against arthropods and other invertebrates.

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Section: Methodsmentioning

confidence: 99%

Documented Utility and Biocultural Value of Aloe L. (Asphodelaceae): A Review

et al. 2009

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“…However, such sustainability is hard to prove scientifically. Some studies have shown that the collection of NTFPs may be unsustainable, even if this is undertaken by traditional populations (Kala 2000(Kala , 2005Pfab and Scholes 2004). The over-exploitation of such natural resources not only affects the different spheres of biological organisation (such as plant populations and ecosystems), but also affects the subsistence of social groups that depend on the diversity of available species in the environment (Bitarilho et al 2006).…”

Section: Introductionmentioning

confidence: 99%

“…Thus, it is impractical to access and monitor the ecological implications of human use for all species that are recognised as useful. Previous studies selected target species based on special characteristics such as their distribution, density and local importance (see Botha et al 2004;Pfab and Scholes 2004;Bitarilho et al 2006;Monteiro et al 2006b;Tabuti and Mugula 2007). For the present study, we chose a plant that is of particular importance to caatinga communities, Anadenanthera colubrina Vell.…”

mentioning

confidence: 99%

Impact assessment of the harvest of a medicinal plant (Anadenanthera colubrina (Vell.) Brenan) by a rural semi-arid community (Pernambuco), northeastern Brazil

Soldati

Albuquerque

2010

International Journal of Biodiversity Science, Ecosystem Servic

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Rural communities depend on plant resources, and research is necessary to evaluate the impact of their exploitative practices. This study evaluated the use of Anadenanthera colubrina (Vell.) Brenan, angico, a tree species widely employed by the rural community of Carão (Pernambuco, Brazil) and the impacts of this harvesting practice. Angico has been cited as having 28 uses in five categories, and the bark is the most used. The medicinal uses are dominant in the community and the species is collected in four collection zones: home gardens, mountain, pasture and mountain base. In order to evaluate the sustainability of this practice, the extraction events in an A. colubrina population were recorded in 2008, and the population structure was analysed. The 101 interviews resulted in identification of 28 uses of which the medicinal category was most prevalent. The most exploited parts of A. colubrina were the bark and stem; the main collection zones were home gardens and mountains. Of the 1040 A. colubrina individuals that we recorded in an area of 2.7 ha, 70 showed signs of extraction. Although diameter classes do not show any individual preference, the population structure tends towards an inverted J model, which suggests that it is stable and its viability is not affected by the extraction being carried out. The data collected in this study suggest that maintaining the current methods and rates of exploitation of the A. colubrina population is sustainable and allows for the permanence of this local resource stock used by the Carão community. However, projections from our results on A. colubrina population structure should be considered carefully because only one population was analysed, over one-time period.

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“…A follow-up stochastic population modelling study on the same population of A. peglerae yielded an additional eight years of monitoring data (Pfab and Scholes, 2004). Results showed that A. peglerae is relatively long-lived; with an average adult lifespan of 60 years (Pfab and Scholes, 2004). Recruitment levels are low, and on average, seedlings grow to juveniles after four years and juveniles mature to adults within six years (Pfab and Scholes, 2004).…”

Section: Tree Aloes In the Northern Cape South Africamentioning

confidence: 97%

“…Flowering and seed production were both erratic (Scholes, 1988), which may account for the relatively low numbers of seedlings. A follow-up stochastic population modelling study on the same population of A. peglerae yielded an additional eight years of monitoring data (Pfab and Scholes, 2004). Results showed that A. peglerae is relatively long-lived; with an average adult lifespan of 60 years (Pfab and Scholes, 2004).…”

Section: Tree Aloes In the Northern Cape South Africamentioning

confidence: 98%