Abundance distribution of common and rare plant species of Brazilian savannas along a seasonality gradient

Silva, Igor Aurélio; Cianciaruso, Marcus V.; Batalha, Marco Antônio

doi:10.1590/s0102-33062010000200011

Cited by 14 publications

(10 citation statements)

References 34 publications

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“…(), although not directly dealing with latitudinal evenness gradients, pointed to a positive correlation of evenness and habitat productivity, while Silva et al. () reported a negative evenness gradient in Brazilian savanna plants with respect to increased climate seasonality. These results strongly corroborate the hypothesis that stable and productive habitats contain more even communities with fewer relatively rare species.…”

Section: Discussionmentioning

confidence: 97%

Climatic and geographic correlates of global forest tree species–abundance distributions and community evenness

Ulrich

Kusumoto

Shiono

et al. 2015

J Vegetation Science

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Questions: Species-abundance distributions (SADs) have long been at the centre of ecological interest because they summarize various patterns of community assembly in condensed form. Here we link observed patterns of SAD shape and evenness to latitude and climatic conditions to infer global trends in abundance distributions. Location: Global.Methods: We compiled data on tree species abundances and climate covariates from 605 sites worldwide. We applied linear regression modelling and nonlinear least squares fitting of log-series and lognormal abundance distributions to species rank-order log-abundance plots to assess latitudinal and climatic gradients in abundance distributions and Pielou evenness. Results:We observed significant latitudinal trends in SAD shape and evenness, even after accounting for richness and spatial effects. Evenness tended to increase towards lower latitudes and was positively correlated with actual evapotranspiration and negatively with climatic variability. We observed an excess of log-series SADs at lower latitudes and an increase in lognormal distributions towards northern latitudes. Accordingly, the proportion of species less abundant than expected from a log-series distribution decreased towards the tropics. Conclusions:We speculate that the observed latitudinal trends are caused by respective gradients in the importance of dispersal for local tree community assembly. This interpretation implies the hypothesis that tropical communities tend to be more open and input-driven in comparison to temperate communities.

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Section: Discussionmentioning

confidence: 97%

Climatic and geographic correlates of global forest tree species–abundance distributions and community evenness

Ulrich

Kusumoto

Shiono

et al. 2015

J Vegetation Science

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“…1). Lognormal SADs are common in closed competition structured animal (Magurran and Henderson 2003) plant (Silva et al 2010) communities. Our results from submerged plant communities add to the impression that lognormal distributions form by universal processes acting on animal and plant communities that are independent of habitat and taxon peculiarities.…”

Section: Discussionmentioning

confidence: 99%

“…Patterns of abundance are usually described by means of relative species abundance distributions (SADs), which are often visualized by rank orderabundance plots (RADs) (McGill et al 2007;. RADs were found to follow two major types of distribution Silva et al 2010) that have been linked to specific patterns of resource use (Tokeshi 1999), habitat characteristics (Magurran 2004;McGill et al 2007), and dispersal regimes (Zillio and Condit 2007). Lognormal type abundance distribution seems to occur in rather stable and closed communities (Tokeshi 1999;Hubbell 2001;, while log-series distributions describe dispersal-driven open assemblages (Fisher et al 1943;Zillio and Condit 2007;.…”

Section: Introductionmentioning

confidence: 99%

Patterns of abundance and co‐occurrence in aquatic plant communities

Chmara¹,

Szmeja²,

Ulrich³

2013

Ecological Research

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Aquatic plants are well suited as subjects for studies on the distribution and abundance of co-occurring species, especially due to the simple structure of their communities, well defined toposequences and relatively easily measurable environmental factors. Here we show that underwater plants occurring in semi-natural lakes form stable communities, where species interactions dominate over dispersal dynamics to form a modular community structure with a high degree of zonation (turnover) and low within-module species richness. In turn, human-induced disturbance largely destroyed the modular structure. Our results indicate that (1) species abundance distributions (SADs) of underwater plant communities are well described by the lognormal model; (2) environmental characters did not significantly influence the SADs of underwater plant communities; (3) log-series SADs do not indicate specific types of community organization; (4) in our lake communities only few satellites (tourists) occur; (5) the co-occurrence of species is highly dependent on the turnover across lakes and water depth zones; and (6) species zonation is a function of lake properties.

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“…The area with relatively high number of species (Ikorodu) was observed to be more diverse and its representative species were more evenly distributed. This may be attributed to the size of the species pool (Silva et al, 2010).…”

Section: Seasonal Difference In the Occurrence Of Taxamentioning

confidence: 99%

Impact of seasonal changes on the vegetation composition of some selected areas in Lagos state, Nigeria

2019

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Rapid degradation of wetlands and habitat fragmentation are major threats to species diversity and ecological paradigm in Lagos state, Nigeria. Best to our knowledge, no empirical study has explored the effects of seasonal changes on covering three major cities in the statewithin the major cities in Lagos state. For this, we carried out a study covering the three major cities in Lagos: Badagry, Epe and Ikorodu. Permanent plots were randomly established for monthly data collection (quadrat method; size=10 x 10 m), that span across one-year period covering the wet and dry season). We observed two major vegetation types (secondary forest and mangrove) in the studied areas. Additionally, we documented 107 species belonging to 90 genera and 40 families. Species diversity analysis indicated higher diversity, abundance, species richness and evenness in Ikorodu and Epe during the wet has a greater while high species diversity was observed in Badagry during the dry season. The Dahomey gap phenomenon have greater implication on the Badagry vegetation while the coastal nature of Epe and Badagry negatively influenced their vegetation structure. Analyses inferred that species diversity pattern in the studied area seem to be determined by seasonal changes alongside anthropogenic activities and as a environmental factors (rainfall, geomorphology and geology). Further, our result suggests that Ikorodu could be regarded potential biodiversity hotspot area for conservation purposes because of its high floral composition and diversity. Therefore, improved management and conservation of the vegetation of the Ikorodu area is hereby recommended. The findings from this study will be useful in guiding the Physical Planning and Urban Development and Environment ministries in Lagos state for appropriate management and monitoring of developmental projects for sustainable development.Impacto de los cambios estacionales en la composición de la vegetación de algunas áreas seleccionadas en el estado de Lagos, NigeriaResumen. La rápida degradación de los humedales y la fragmentación del hábitat son amenazas importantes para la diversidad de especies y el paradigma ecológico en el estado de Lagos, Nigeria. Según nuestro conocimiento, ningún estudio empírico ha explorado los efectos de los cambios estacionales en los conjuntos de vegetación dentro de las principales ciudades del estado de Lagos. Para ello, llevamos a cabo un estudio que abarca las tres ciudades principales de Lagos: Badagry, Epe e Ikorodu. Las parcelas permanentes se establecieron al azar para la recopilación de datos mensuales (método de cuadrantes; tamaño=10 x 10 m) que abarcan un período de un año que abarca la temporada húmeda y seca). Observamos dos tipos principales de vegetación (bosque secundario y manglar) en el área estudiada. Adicionalmente, documentamos un total de 107 especies pertenecientes a 90 géneros y 40 familias. Los análisis de diversidad de especies indicaron mayor diversidad, abundancia, riqueza de especies y uniformidad en Ikorodu y Epe durante la estación ...

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Abundance distribution of common and rare plant species of Brazilian savannas along a seasonality gradient

Cited by 14 publications

References 34 publications

Climatic and geographic correlates of global forest tree species–abundance distributions and community evenness

Climatic and geographic correlates of global forest tree species–abundance distributions and community evenness

Patterns of abundance and co‐occurrence in aquatic plant communities

Impact of seasonal changes on the vegetation composition of some selected areas in Lagos state, Nigeria

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