An integrated conservation strategy for the cycadDioon edule Lindl

Vovides, Andrew P.; Iglesias, Carlos

doi:10.1007/bf02291883

Cited by 22 publications

(14 citation statements)

References 14 publications

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“…1A, B). This practice occurs only at the ‘Monte Oscuro’ population (one of the sites studied), where a project aimed towards sustainable management has been established since 1990 as an alternative conservation strategy in order to discourage plant decapitation and removal (Vovides & Peters, 1987; Vovides & Iglesias, 1994; Vovides et al ., 2002).…”

Section: Methodsmentioning

confidence: 99%

Population dynamics of the Mexican cycadDioon eduleLindl. (Zamiaceae): life history stages and management impact

Octavio‐Aguilar

González‐Astorga

Vovides

2008

Botanical Journal of the Linnean Society

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The demographic dynamics of three populations of Dioon edule Lindl. (Zamiaceae) were studied in a fragmented landscape using projection matrix modelling. Compared with other plant species, D. edule behaves like a tree life-form species. Density and spatial distribution patterns varied among populations according to models for animal-dispersed tree species. In all scenarios, l was most sensitive to changes in abundance of adult plants. The elasticity reproductive component (F) for the three populations was zero and stasis values (L) were higher, this being a function of the permanence of non-reproductive individuals. It was detected that disturbance influences the population dynamics of D. edule as a function of adult plant persistence. This observation suggests that the conservation of adult plants is critical for D. edule and perhaps for all cycads species. Adult plant decapitation should be halted at the 'Monte Oscuro' population, subjected to sustainable management since 1990, if higher seed production is needed in rural nurseries.

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Section: Methodsmentioning

confidence: 99%

Population dynamics of the Mexican cycadDioon eduleLindl. (Zamiaceae): life history stages and management impact

Octavio‐Aguilar

González‐Astorga

Vovides

2008

Botanical Journal of the Linnean Society

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“…Regarding the southern populations, although they are protected, more effective management plans should be performed for the preservation of D. sonorense. Plans that include the collaboration of local people, like the one that was applied with the species D. edule in Veracruz, should be promoted (Vovides and Iglesias, 1994).…”

Section: Conservation Of Populations Of Dioon Sonorensementioning

confidence: 99%

Conservation genetics of an endangered cycad, Dioon sonorense (Zamiaceae): implications from variation of chloroplast DNA

2014

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Abstract:The endemic species Dioon sonorense comprises the northernmost group of populations of Dioon, in Sonora, Mexico. Although it is endangered, only the southern populations are protected within a preservation area, while the remaining populations have not been taken into account in management plans or genealogical studies. Describing the intraspecifi c genealogy and the geographical structure of the genetic variation of D. sonorense may help in the identifi cation of units for further conservation. Therefore, the main objective of this study was to describe the intraspecifi c genealogy of populations throughout the range of distribution of the endangered species D. sonorense, using haplotypes of the trnL-F spacer of the cpDNA. In addition, the levels of diversity of the employed molecular marker were estimated. Low levels of variability were recorded and at least two evolutionary units, corresponding to each haplotype, were identifi ed as components of the species. The inclusion of northern populations into conservation programs is recommended. In order to integrate these fi ndings to the genealogy of genus Dioon, trnL-F sequences of all the remaining species were merged and analyzed. An ancestral haplotype with wide distribution was detected in several species and one haplotype in D. sonorense was found shared with its sister species, D. tomasellii. This work represents a fi rst attempt to reconcile a genealogical approach in the identifi cation of important centers of genetic diversity of Mexican cycads. Key words: chloroplast DNA, conservation genetics, Dioon sonorense, endangered species.Resumen: La especie endémica Dioon sonorense representa el grupo de poblaciones más norteño para el género Dioon, en Sonora, México. A pesar de su estatus en peligro de extinción, sólo las poblaciones del sur están protegidas dentro de un área de conservación, mientras que las poblaciones restantes no han sido consideradas en los planes de manejo o en estudios genealógicos. La descripción de la genealogía intraespecífi ca y la estructura geográfi ca de la variación genética de D. sonorense puede ayudar en la identifi cación de unidades evolutivas para su posterior conservación. Por lo tanto, el objetivo principal de este estudio fue describir la genealogía intraespecífi ca de las poblaciones de D. sonorense a lo largo de su rango de distribución, usando los haplotipos del espacio trnL-F del ADNcp. Además, se estimaron los niveles de diversidad genética usando este marcador molecular. Se obtuvieron niveles bajos de variabilidad y se identifi caron al menos dos unidades evolutivas, correspondientes a cada haplotipo que componen a la especie. Se recomienda la inclusión de las poblaciones del norte en los programas de conservación. Con el fi n de integrar estos hallazgos en el contexto de la genealogía del género Dioon, las secuencias del espacio trnL-F de todas las especies restantes fueron combinadas y analizadas. Se detectó un haplotipo ancestral con una amplia distribución en varias especies y un haplotipo en D. sonore...

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“…Population analysis of threatened plants, especially cycads, based on these methods, will not only enable us to propose more precise IUCN listing categories but also to recommend management plans and in situ conservation strategies which will hopefully lead to maintenance and preservation of their diversity. Sustainable utilization strategies have been implemented for in situ management of some Mexican cycad species including C. mirandae, aimed at discouraging illegal collecting, and to provide incentive to conserve their habitats by local farmers (Vovides and Iglesias 1994;INE-SEMARNAP 2000;Vovides et al 2002). This activity fits in well with the missions of regional botanic gardens as assessors to biosphere reserves, thus implementing various articles of the Convention on Biological Diversity (Given 1997).…”

Section: Introductionmentioning

confidence: 99%

Demography of the cycad Ceratozamia mirandae (Zamiaceae) under disturbed and undisturbed conditions in a biosphere reserve of Mexico

et al. 2006

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The cycad Ceratozamia mirandae is endemic to Chiapas, Mexico. Demographic studies were made in two of its populations in the Sepultura Biosphere Reserve under different conservation conditions; in the nucleus zone ''Tres Picos'' (conserved) and buffer zone ''La Sombra'' (disturbed and under management). Spatial distribution of C. mirandae was aggregated, showed a clumped local distribution on shallow soils on steep slopes and male and female cones appear to be synchronous in both populations. The population structure was of type I (Bongers) for both sites. Individuals between the sites showed differences in growth pattern. The oldest plants (80-90 cm tall) were estimated to be about 490 years at ''La Sombra''. The finite growth rate (k) in the buffer zone population showed a tendency for decrease whilst in the nucleus zone this estimate remained stable. The highest elasticity values lied in the transition of the first three classes of the ''La Sombra'' population, in ''Tres Picos'' this corresponded to adult plants between 20 and 30 cm tall. Given the above, it is proposed that in the nucleus zone, reproductive adults should be of highest conservation priority, whereas in the buffer zone seedling reintroduction should be carried out regularly until the population increases. We recommend an IUCN Red List category of Vulnerable (VU C, 2a), largely due to difficult-to-control destructive annual forest fires that occur in this Reserve.

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An integrated conservation strategy for the cycadDioon edule Lindl

Cited by 22 publications

References 14 publications

Population dynamics of the Mexican cycadDioon eduleLindl. (Zamiaceae): life history stages and management impact

Population dynamics of the Mexican cycadDioon eduleLindl. (Zamiaceae): life history stages and management impact

Conservation genetics of an endangered cycad, Dioon sonorense (Zamiaceae): implications from variation of chloroplast DNA

Demography of the cycad Ceratozamia mirandae (Zamiaceae) under disturbed and undisturbed conditions in a biosphere reserve of Mexico

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