Biodiversity and vegetation of small‐sized inselbergs in a West African rain forest (Taı, Ivory Coast)

Porembski, Stefan; Szarzynski, Joerg; Mund, Jan‐Peter; Barthlott, Wilhelm

doi:10.1046/j.1365-2699.1996.00982.x

Cited by 61 publications

(63 citation statements)

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“…Además de los factores locales (i.e., química de las rocas, tamaño de los afloramientos y área disponible para las plantas, disturbios, etc.) mencionados por diversos autores (Cabido et al, 1990;Porembski et al, 1996;Wesche et al, 2005), Wiser & Buxton (2008) han advertido sobre la importante influencia que podría ejercer la composición de la vegetación de las áreas circundantes a los afloramientos. En las comunidades de los ambientes basálticos estudiados, éste podría ser un factor a considerar, ya que, como lo revela la tabla florística presentada, las Islas comparten numerosas especies con la Matriz Natural.…”

Section: Discussionunclassified

“…Los hábitats rocosos suelen actuar como refugio (sensu Birks, 2015) de plantas, dando protección a especies raras y endémicas (Porembski et al, 1996;Jacobi et al, 2007), como así también a especies sensibles al fuego (Clarke, 2002;Watson & Wardell-Johnson, 2004), al pastoreo (Milchunas & Noy-Meir, 2002) y a sequías (Burke, 2002). Al mismo tiempo, se trata de ambientes sometidos a perturbaciones por actividades mineras, especialmente en el caso de rocas ricas en minerales metalíferos (Finger et al, 1999), lo cual provoca severos impactos en la estructuctura y composición de las comunidades vegetales (Ginocchio & Baker, 2004;Brady et al, 2005;Jacobi & do Carmo, 2008a;Gibson et al, 2010;Jacobi et al, 2011).…”

Section: Introductionunclassified

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Heterogeneidad de la vegetación en ambientes basálticos del centro de Argentina.

Cantero¹,

Mulko²,

Núñez³

et al. 2017

Bol. Soc. Argent. Bot.

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Summary:Heterogenity of the vegetation of basaltic environments in central Argentina. The flora and the vegetation of basaltic outcrops of Los Cóndores Mountains, central Argentina, are described. Plant communities were sampled following the Braun-Blanquet methods. The 98 relevés × 272 species matrix was classified through the ISOPAM method. The classification discriminated three main communities occurring in the three different substrates explored in this landscape: Rocky Islands (inselbergs), a Natural Matrix surrounding the Islands and an Agricultural Matrix, surrounding the whole basaltic area. The three communities differed in composition and physiognomy: the Islands were the less disturbed sites, reporting the highest plant species richness and diversity as well as the higher number of endemics, and the lowest number of exotic species. In the other extreme of the disturbance gradient, the Agricultural Matrix showed the opposite patterns and is dominated by annual and perennial herbs, mainly weeds. While the number of aliens is low in the Islands and in the Natural Matrix, almost 50% of the species are exotic in the Agricultural Matrix. The results of this study reveal that the basaltic inselbergs are relevant sites for the conservation of the natural heritage.Key words: Basaltic environments, flora, plant communities, central Argentina.Resumen: Se decribe la flora y la vegetación de pasiajes basálticos de la Sierra de Los Cóndores, Córdoba, Argentina. La vegetación se estudió según criterios de la escuela de Braun-Blanquet; la matriz de 98 inventarios × 272 spp. fue clasificada a través del método ISOPAM. El análisis discrimina tres comunidades correspondientes respectivamente a las tres geoformas relevadas en estos paisajes: Islas rocosas (inselbergs), la Matriz Natural que rodea a las Islas y la Matriz Agrícola que circunda al complejo de paisajes basálticos. Las tres comunidades difieren en su composición florística: las Islas rocosas son los sitios menos perturbados, más ricos en especies, con mayor diversidad, mayor número de especies endémicas y su fisonomía está dominada por formas arbustivas. En el otro extremo, la Matriz Agrícola es la más pobre en especies, la de menor diversidad y endemicidad, y predominan las hierbas perennes y anuales. Las Islas rocosas y la Matriz Natural registran bajos números de especies exóticas en su composición, mientras cerca del 50% de la flora de la matriz agrícola se compone de especies adventicias. Los resultados de este estudio revelan la importancia de las islas rocosas basálticas para la conservación del patrimonio natural de la provincia de Córdoba.

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Section: Discussionunclassified

Section: Introductionunclassified

Heterogeneidad de la vegetación en ambientes basálticos del centro de Argentina.

Cantero¹,

Mulko²,

Núñez³

et al. 2017

Bol. Soc. Argent. Bot.

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“…Vários estudos sobre a vegetação associada a afloramentos rochosos têm sido realizados na África (Porembski et al 1996, Parmentier 2003 e na América do Sul (Ibisch et al 1995, Gröger & Barthlott 1996. No Brasil, a maioria dos trabalhos concentra-se nos campos de altitude (Porembski et al 1998, Meireles et al 1999, Scarano 2002, nos cerrados rupestres (Oliveira-Filho & Martins 1986) e, em especial, nos campos rupestres (Andrade et al 1986, Harley & Simmons 1986, Giulietti et al 1987, Giulietti & Pirani 1988, Harley 1995, Mello-Silva 1995, Stannard 1995, Giulietti et al 1997, Munhoz & Proença 1998, Conceição & Giulietti 2002, Guedes & Orge 1998, Romero & Nakajima 1999, Giulietti et al 2000, Romero 2002).…”

Section: Introductionunclassified

Composição florística dos afloramentos rochosos do Morro do Forno, Altinópolis, São Paulo

Oliveira

Godoy

2007

Biota Neotrop.

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Rock outcrops on the plateaus of hills have peculiar vegetation. The major part of the species occurring on these areas have various features that allow their survival under adverse environmental conditions as poor and sandy soil with intense solar radiation and great temperature ranging from day and night. These particular characteristics aroused the interest in the study of the flora on rock outcrops of Morro do Forno (Altinópolis-SP). A list of 157 species of 48 families was recorded. Fabaceae (14 spp.), Asteraceae (12 spp.), Poaceae (12 spp.), Rubiaceae (11 spp.), Malpighiaceae (9 spp.) and Melastomataceae (8 spp.) are the families with more number of species. The herbaceous-shruby stratum characterizes the area (61%), followed by arboreous (19%); lianas (11%) and subshruby (9%) are less representative. Many of the species occurring on the area are present another Brazilian rocky outcrops as, for example, the "campos rupestres" of the Minas Gerais state (Serra do Cipó and Serra da Canastra) and the "cerrados rupestres" of the Mato Grosso state (Chapada dos Guimarães).Keywords Áreas de afloramentos rochosos em topos de morros abrigam uma vegetação bastante peculiar. Muitas das espécies que ocorrem nessas áreas apresentam uma série de características que permitem sua sobrevivência num ambiente com solo pobre e arenoso, com alta insolação e grande oscilação de temperatura entre o dia e a noite. Essas características particulares despertaram o interesse no estudo da flora das áreas de afloramentos rochosos do Morro do Forno (Altinópolis-SP). A flora apresenta um total de 157 espécies distribuídas em 48 famílias. Fabaceae (14 spp.), Asteraceae (12 spp.), Poaceae (12 spp.), Rubiaceae (11 spp.), Malpighiaceae (9 spp.) e Melastomataceae (8 spp.) são as famílias com o maior número de espécies. O estrato herbáceo-arbustivo caracteriza a área (61%), seguido pelo arbóreo (19%), sendo de menor representatividade as lianas (11%) e os subarbustos (9%). Muitas das espécies que ocorrem na área estão presentes em outros afloramentos rochosos brasileiros como, por exemplo, nos campos rupestres da Serra do Cipó e Serra da Canastra em Minas Gerais e nos cerrados rupestres da Chapada dos Guimarães no Mato Grosso.Palavras-chave: flora, afloramentos rochosos, Morro do Forno, São Paulo.

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“…The Korannaberg near Excelsior (also in the eastern Free State) is the only other inselberg where a phytosociological study was performed, by Du Preez (1991,1992), Du Preez and and Du Preez, Bredenkamp and Venter (1991). Studies of the grassland vegetation of inselbergs in Africa are limited to studies in west Africa by Porembski and Barthlott (1995), Porembski and Brown (1995), Porembski et al (1996) and Porembski et al (1998), in central Atlantic Africa by Parmentier et al (2006), and in Namibia by Burke (2001Burke ( , 2004. The lack of data of inselberg vegetation can be attributed to the physical difficulty of accessing inselbergs.…”

Section: Introductionmentioning

confidence: 99%

The Grassland vegetation of Platberg, eastern Free State, South Africa

Brand

Brown

Preez

2011

Koedoe

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Platberg is an inselberg that presents a refuge for indigenous plants and animals. Uncontrolled human access to this area threatens this sensitive ecosystem. The vegetation of Platberg was investigated to obtain an inventory of the different plant species and communities present in this area. A hierarchical classification, a description and an ecological interpretation of the grassland communities of Platberg are presented. A total of 169 sample plots were placed on a stratified random basis within the study area. From a TWINSPAN classification a total of 27 different plant communities, which can be grouped into two major community types, nine communities, 18 sub-communities and six variants, were identified. A significant difference in species richness was found between the two major communities, with the higher-altitude communities having a higher species richness than the communities on the lower-lying slopes. A total of 26 endemic or near endemic Drakensberg Alpine Centre species were recorded. Conservation implications:Anthropogenic influences are felt globally on ecosystems. Highaltitude habitats and organisms will be affected first. Inselbergs have high levels of endemic organisms and are reservoirs and refugia for unique genetic material. This grassland plant community survey of Platberg provides valuable information on inselberg ecology for conservation planning.

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Biodiversity and vegetation of small‐sized inselbergs in a West African rain forest (Taı, Ivory Coast)

Cited by 61 publications

References 9 publications

Heterogeneidad de la vegetación en ambientes basálticos del centro de Argentina.

Heterogeneidad de la vegetación en ambientes basálticos del centro de Argentina.

Composição florística dos afloramentos rochosos do Morro do Forno, Altinópolis, São Paulo

The Grassland vegetation of Platberg, eastern Free State, South Africa

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