Demography, and genetic and morphological variability of the endangered Sophronitis sincorana (Orchidaceae) in the Chapada Diamantina, Brazil

Borba, Eduardo Leite; Funch, Roy Richard; Ribeiro, Patrícia Luz; Smidt, Eric C.; Silva-Pereira, Viviane

doi:10.1007/s00606-007-0555-9

Cited by 30 publications

(14 citation statements)

References 36 publications

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“…For population names see Table 1 Table 5 Table 1 Genetica (2011) 139:431-440 437 and Cactaceae. On the other hand, Borba et al (2001Borba et al ( , 2007, Azevedo et al (2007) and Ribeiro et al (2008) found high genetic diversity in rupicolous orchids from campos rupestres in the Espinhaço Range. It was expected that V. gigantea, which has a very restricted distribution, would display low levels of genetic diversity.…”

Section: Discussionmentioning

confidence: 94%

Genetic structure and variability of the endemic and vulnerable Vellozia gigantea (Velloziaceae) associated with the landscape in the Espinhaço Range, in southeastern Brazil: implications for conservation

et al. 2011

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The Espinhaço Range, in eastern Brazil, has a peculiar landscape that has influenced the vegetation pattern of the region because of its valleys, canyons, ranges and disjunct rock outcrops found at high elevations. In this region, the vegetation type known as campos rupestres (rupestrian fields), which occurs in the disjunct outcrops, has high levels of species richness and endemism. Vellozia gigantea, a 6-m tall dracenoid monocot, is a vulnerable species endemic to this vegetation and has a narrow distribution that extends approximately 27 km. This region is located in a disturbed area, where populations are divided into three geographical groups, separated by a canyon and a valley. For this study, we used ISSR markers to measure the genetic diversity of the species and test the hypothesis that the canyon and the valley constitute geographical barriers to gene flow in V. gigantea. Nine populations and 173 individuals were analyzed using nine ISSR primers, which produced 89 fragments. In spite of being a vulnerable species with a narrow distribution, the populations of V. gigantea have high genetic diversity (mean percentage of polymorphic loci = 56.6%; mean Shannon's index of diversity = 0.278; mean expected heterozygosity = 0.183). Genetic divergence among populations was high (Φ(ST) = 0.28), and principal coordinate, neighborjoining and Bayesian analyses showed that only the canyon may constitute a partial barrier to gene flow in this species. Groups of populations separated by the canyon should be managed separately because they contain different gene pools.

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Section: Discussionmentioning

confidence: 94%

Genetic structure and variability of the endemic and vulnerable Vellozia gigantea (Velloziaceae) associated with the landscape in the Espinhaço Range, in southeastern Brazil: implications for conservation

et al. 2011

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“…Harvesting may endanger some populations (Borba et al. ). However, harvesting effects may depend on human culture and taxonomic groups and may allow a higher degree of biodiversity conservation, compared with other land‐use alternatives, such as the conversion of forest to pastures (Ruiz‐Pérez ).…”

Section: Introductionmentioning

confidence: 99%

“…Epiphyte harvesting is very common in certain geographical regions (Flores-Palacios and Valencia D ıaz 2007), but its consequences are poorly known. Harvesting may endanger some populations (Borba et al 2007). However, harvesting effects may depend on human culture and taxonomic groups and may allow a higher degree of biodiversity conservation, compared with other land-use alternatives, such as the conversion of forest to pastures (Ruiz-P erez 1997).…”

Section: Introductionmentioning

confidence: 99%

Possible combined effects of climate change, deforestation, and harvesting on the epiphyte Catopsis compacta: a multidisciplinary approach

Castillo

Trujillo‐Argueta

Gómez‐Ocampo

et al. 2013

Ecology and Evolution

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Climate change, habitat loss, and harvesting are potential drivers of species extinction. These factors are unlikely to act on isolation, but their combined effects are poorly understood. We explored these effects in Catopsis compacta, an epiphytic bromeliad commercially harvested in Oaxaca, Mexico. We analyzed local climate change projections, the dynamics of the vegetation patches, the distribution of Catopsis in the patches, together with population genetics and demographic information. A drying and warming climate trend projected by most climate change models may contribute to explain the poor forest regeneration. Catopsis shows a positive mean stochastic population growth. A PVA reveals that quasi-extinction probabilities are not significantly affected by the current levels of harvesting or by a high drop in the frequency of wet years (2%) but increase sharply when harvesting intensity duplicates. Genetic analyses show a high population genetic diversity, and no evidences of population subdivision or a past bottleneck. Colonization mostly takes place on hosts at the edges of the fragments. Over the last 27 years, the vegetation cover has being lost at a 0.028 years−1 rate, but fragment perimeter has increased 0.076 years−1. The increases in fragment perimeter and vegetation openness, likely caused by climate change and logging, appear to increase the habitat of Catopsis, enhance gene flow, and maintain a growing and highly genetically diverse population, in spite of harvesting. Our study evidences conflicting requirements between the epiphytes and their hosts and antagonistic effects of climate change and fragmentation with harvesting on a species that can exploit open spaces in the forest. A full understanding of the consequences of potential threatening factors on species persistence or extinction requires the inspection of the interactions of these factors among each other and their effects on both the focus species and the species on which this species depends.

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“…Also, the history of colonization of a population or species may be important in determining its genetic structure ( Chapman et al, 2000 ). Data regarding morphological differentiation among populations, together with data on genetic diversity, are important to support population management and conservation strategies ( Borba et al, 2007 ). Data regarding morphological differentiation among populations, together with data on genetic diversity, are important to support population management and conservation strategies ( Borba et al, 2007 ).…”

mentioning

confidence: 99%

“…Studies on genetic structure of populations have been reported for some bromeliad species in different subfamilies ( Soltis et al, 1987 ;Sarthou et al, 2001 ;Gonz á lez-Astorga et al, 2004 ;Sgorbati et al, 2004 ;Cavallari et al, 2006 ;Barbar á et al, 2007aBarbar á et al, , 2008Barbar á et al, , 2009Palma-Silva et al, 2009 ;Hmeljevski et al, 2011 ), which allow us to compare genetic attributes of related species with varying breeding systems and life histories. Data regarding morphological differentiation among populations, together with data on genetic diversity, are important to support population management and conservation strategies ( Borba et al, 2007 ).…”

mentioning

confidence: 99%

Genetic structure and phenotypic variation in wild populations of the medicinal tetraploid species Bromelia antiacantha (Bromeliaceae)

Zanella

Bruxel

Paggi

et al. 2011

American J of Botany

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Demography, and genetic and morphological variability of the endangered Sophronitis sincorana (Orchidaceae) in the Chapada Diamantina, Brazil

Cited by 30 publications

References 36 publications

Genetic structure and variability of the endemic and vulnerable Vellozia gigantea (Velloziaceae) associated with the landscape in the Espinhaço Range, in southeastern Brazil: implications for conservation

Genetic structure and variability of the endemic and vulnerable Vellozia gigantea (Velloziaceae) associated with the landscape in the Espinhaço Range, in southeastern Brazil: implications for conservation

Possible combined effects of climate change, deforestation, and harvesting on the epiphyte Catopsis compacta: a multidisciplinary approach

Genetic structure and phenotypic variation in wild populations of the medicinal tetraploid species Bromelia antiacantha (Bromeliaceae)

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