High‐elevation rock outcrop vegetation of the Southern Appalachian Mountains

Wiser, Susan K.; Peet, Robert K.; White, Peter S.

doi:10.2307/3236382

Cited by 107 publications

(61 citation statements)

References 60 publications

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“…En este estudio, los tres ambientes geomorfológicos explorados se encuentran bajo condiciones climáticas similares; por lo tanto, las diferencias reveladas por el análisis de clasificación podrían adjudicarse más bien a factores que actúan a escala local. Tanto efectos de la geoquímica sobre la composición florística (Wiser et al, 1996;Chiarucci et al, 2001;Grace et al, 2007;Tsiripidis et al, 2010), como así también diferencias locales en el tamaño y forma de los bloques rocosos (Wiser & Buxton, 2009), han sido documentados como fuentes de variación de las comunidades de los roquedales. Considerando que las Islas rocosas relevadas en este estudio no exiben diferencias conspicuas en cuanto al tamaño y morfología de los bloques, las diferencias en composición registradas entre los dos subgrupos observados en ellas (i.e., 1.1 y 1.2) posiblemente respondan a la variabilidad en la composición química de los basaltos, especialmente en las concentraciones de SiO 2 y MgO.…”

Section: Discussionunclassified

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

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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“…We considered only ''incidence rates'' in richness and species composition because these are highly indicative of changes in species turnover and species abundance (Myster and Pickett 1994). To calculate rates of change in richness and species composition, respectively, Sørensen's dissimilarity index (SD) (Kent and Coker 1992) and Euclidean distances (ED) between coordinates of plots in the DCA space (Wiser et al 1996) were used. To test the effects of environmental heterogeneity and time since disturbance on the direction of successional changes in richness, biovolume, and species composition, two-way ANOVA tests were performed.…”

Section: Discussionmentioning

confidence: 99%

Landslide early succession in a neotropical dry forest

Velázquez

Gómez‐Sal

2008

Plant Ecol

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Early succession on large landslides in highly humanized areas that have a tropical dry climate is not well studied. This study documented vegetation recovery during the first 4 years after disturbance at a landslide on Casita Volcano, Nicaragua. We aimed to determine the main pathways and causes of change in community features, such as richness, biovolume, and species composition and verify the role played by environmental heterogeneity. Data consisting on number, covers and mean height of woody species and several abiotic factors related to fertility and stability of substrates were obtained from permanent plots in previously defined zones. Pathways of early succession were highly contingent on abiotic heterogeneity and landscape context and were mainly controlled by abiotic factors associated with fertility of substrates, and incidence of human disturbances. Those results might form the basis of a model of early succession on landslides located in densely populated areas within tropical dry ecosystems. Our results suggest that, rather than focusing research on large-scale disturbances, the study of succession in landslides of the type that occurred on Casita Volcano must point towards the response of ecosystems to a much more complex disturbance regime, in which human-induced disturbances play a major role.

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“…According to the authors, the reason for the weaker correlation found in their study was the data heterogeneity and the large number of interacting variables when sampling extensive territories. Like Wiser et al (1996), however, we maintain that, despite the great variation in vegetation composition, the continuity of indirect gradient importance is confirmed at both scales as well as across different scales.…”

Section: Scalementioning

confidence: 99%

Gradient analysis of vegetation on the south slope of Vitosha mountain, Southwest Bulgaria

Dyakov¹

2014

Appl Ecol Env Res

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Abstract. Detailed analysis of the relationship between vegetation and environment requires a thorough understanding of the environmental processes that influence vegetation. There is an intimate relationship between vegetation concepts' development, mathematical methods of analysis and knowledge of environmental processes. Traditionally most vegetation/environment studies have been done at a single scale of observation. It has been considered important to assess whether the processes that determine community structure and function are similar at different scales or whether the most important processes change with the scale of observation. This study aims to describe in a quantitative manner the vegetation pattern in a localized area and on that basis to test/verify statistically some previously proposed hypothesis and assumption concerning vegetation organization. Describing the coarsest vegetation pattern, ordination and classification analyses were used. The detailed relationships between environmental gradients and vegetation were examined using regression and correlation methods. Obtained results were tested with different statistical tests for their reliability. We found that the basic environmental gradients influencing the local vegetation are elevation and habitat moisture. The correlation between environmental gradients and vegetation increased with the increasing scale of observation. Environmental gradients influencing vegetation most strongly were the same at the different scales. With the increase of sampled area, correlation strength between environment and vegetation also increased. In the future, if possible, all studies of vegetation/environment relationships should be done at different spatial scales. Gathered quantitative information and verified hypothesis in the current study could be very successfully used in the management and conservation of the local and regional vegetation.

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High‐elevation rock outcrop vegetation of the Southern Appalachian Mountains

Cited by 107 publications

References 60 publications

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

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

Landslide early succession in a neotropical dry forest

Gradient analysis of vegetation on the south slope of Vitosha mountain, Southwest Bulgaria

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