Anatomia foliar de cinco espécies de Polygala de restinga e cerrado

Aguiar-Dias, Ana Cristina Andrade de; Yamamoto, Kikyo; Castro, Marília de Moraes

doi:10.1590/s2175-78602012000200012

Cited by 5 publications

(3 citation statements)

References 22 publications

(31 reference statements)

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“…In addition to its contribution to taxonomy and systematics, the knowledge of plant anatomy can be useful for identifying local adaptations, when the environmental context is considered (e.g., Starr 1912;Hayden 1919;Metcalfe and Chalk 1979;Morretes 1980;Mott and Michaelson 1991;Somavilla and Graciano-Ribeiro 2011;Aguiar-Dias et al 2012;Jakovljevic ´et al 2014;Sanso et al 2014;Perrone et al 2015;Gavilanes et al 2016).…”

Section: Introductionmentioning

confidence: 99%

Comparative leaf anatomy of Baccharis (Asteraceae) from high-altitude grasslands in Brazil: taxonomic and ecological implications

Ornellas

Heiden

Luna

et al. 2019

Botany

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Baccharis L. is an important genus in the high-altitude environments of South America. In the State of Rio de Janeiro, southeastern Brazil, the greatest richness is found at montane and high-montane ecological refuges, known as high-altitude grasslands. The high altitude provides several environmental factors that turn the high-altitude grasslands into singular tropical habitats. In this article we describe the leaf anatomy of six shrubby species of Baccharis, pointing out ecological aspects of the structures, and testing the use of statistical analyses to compare the species. Using light and scanning electron microscopy, we compared the anatomical features of the leaves and performed a cluster and principal component analyses. The results show novel features in the leaf anatomy for the genus, such as an undulated cuticle, three secretory ducts in the midrib, secretory ducts associated with the xylem, and biseriate glandular trichomes with an irregular organization of the cells. Our statistical analyses indicate that the anatomical features of the leaves, especially trichomes, are useful for distinguishing the different species, whereas others, such as isobilateral mesophyll, amphistomatic leaves, and an epidermis with thick cell walls correlate with their high-elevation habitat.

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Section: Introductionmentioning

confidence: 99%

Comparative leaf anatomy of Baccharis (Asteraceae) from high-altitude grasslands in Brazil: taxonomic and ecological implications

Ornellas

Heiden

Luna

et al. 2019

Botany

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“…Furthermore, the porous restinga soils result in low soil fertility and low water retention capacity (Cooper et al 2017), which may impose constraints on plant biomass productivity (Lambers et al 2008, Santiago-garcía et al 2019. In water limited conditions, plants exhibit more conservative strategies, such as small body size and low specific leaf area (Cornwell andAckerly 2009, Katabuchi et al 2012), and the production of thick and scleromorphic leaves with increased longevity (Wright et al 2004, Lambers et al 2008, as are typically found in restinga plant species (Mantuano et al 2006, De Aguiar-Dias et al 2012, Melo Júnior and Torres Boeger 2015, Pinedo et al 2016.…”

Section: )mentioning

confidence: 99%

Drivers of plant traits and forest functional composition in coastal plant communities of the Atlantic Forest

Lourenço

Newman

Ventura

et al. 2019

Preprint

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The severe deforestation of Brazil's Atlantic Forest and increasing effects of climate change underscore the need to understand how tree species respond to climate and soil drivers. We studied 42 plots of coastal restinga forest, which is highly diverse and spans strong environmental gradients. We determined the forest physiognomy and functional composition, which are physical properties of a community that respond to climate and soil properties, to elucidate which factors drive community-level traits. To identify the most important environmental drivers of coastal Atlantic forest functional composition, we performed a forest inventory of all plants of diameter 5 cm and above. We collected wood samples and leaves from ~85% of the most abundant plant species and estimated height, aboveground biomass (AGB), and Lourenço, Jr. et al. Plant trait drivers in flooded forests 2 basal area of individual plants, and the community-weighted specific leaf area (SLA). In addition to plant traits, we measured water table depth and 25 physicochemical soil parameters. We then parameterized several models for different hypotheses relating the roles of nutrients and soil to tropical forest diversity and functioning, as represented by plant traits. Hypotheses were formalized via generalized additive models and piecewise structural equation models. Water table depth, soil coarseness, potential acidity, sodium saturation index (SSI) and aluminum concentration were all components of the best models for AGB, height, basal area, and trait composition. Among the 25 environmental parameters measured, those related to water availability (water table depth and coarse sand), followed by potential acidity, SSI, and aluminum consistently emerged as the most important drivers of forest physiognomy and functional composition. Increases in water table depth, coarse sand, and soil concentration of aluminum negatively impacted all the measured functional traits, whereas SSI had a positive effect on AGB and plant height. These results suggest that sodium is not merely tolerated by Atlantic Forest restinga plant communities, but is important to their structure and functioning. Presence of aluminum in the soil had a complex relationship to overall basal area, possibly mediated by soil organic matter.

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“…Furthermore, the porous restinga soils result in low soil fertility and low water retention capacity (Cooper et al 2017), which may impose constraints on plant biomass productivity (Lambers et al 2008, Santiago‐García et al 2019). In water‐limited conditions, plants exhibit more conservative strategies, such as small body size and low specific leaf area (Cornwell and Ackerly 2009, Katabuchi et al 2012), and the production of thick and scleromorphic leaves with increased longevity (Wright et al 2004, Lambers et al 2008), as are typically found in restinga plant species (Mantuano et al 2006, De Aguiar‐Dias et al 2012, Melo Júnior and Torres Boeger 2015, Pinedo et al 2016).…”

Section: Introductionmentioning

confidence: 99%

Soil‐associated drivers of plant traits and functional composition in Atlantic Forest coastal tree communities

Lourenço

Newman

Ventura³

et al. 2021

Ecosphere

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The severe deforestation of Brazil's Atlantic Forest and the increasing effects of climate change underscore the need to understand how tree species respond to climate and edaphic factors. To identify the most important environmental drivers of coastal Atlantic Forest diversity and functional composition, we studied 42 plots of coastal Atlantic Forest (restinga), which has a high diversity of plant communities and spans strong environmental gradients. We examined how forest physiognomy and functional composition respond to changes in the environment, hydraulic, and soil properties. We tested different hypotheses relating the roles of nutrients and soil water availability in driving shifts in tropical forest diversity and functioning. We collected wood samples and leaves from~85% of the plant species identified in the forest inventory and estimated the community-weighted tree height, aboveground biomass, basal area of individual plants, specific leaf area, wood density, and the total tree biomass per community by the sum of all trees' aboveground biomass per plot. We measured water table depth and 24 physicochemical soil parameters. Hypotheses relating to these factors were formalized via both generalized additive models and piecewise structural equation models and null models of community assembly. Increasing drought, as reflected by increasing water table depth, coarse sand, and soil concentration of aluminum (>6 cmol/kg), was found to be a primary driver of shifts in all measured functional traits. Water table depth was found to be the main environmental driver of restinga species diversity, but shifts in species richness were largely decoupled from functional richness and functional dispersion. Our results suggest that decreases in soil water availability are a central driver of local phenotype-environment matching and that increasing water limitation increases the role of environmental filtering on multiple traits. Our results show that drought leads to a strong convergence (standardized effect size < À1.95) in forest function and leads to shifts to smaller statured forest in particular. These findings reveal important differences in the drivers of forest structure and functioning, suggesting that changes in local spatial variation in soil and moisture variables will be a central issue in restinga management and conservation.

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Anatomia foliar de cinco espécies de Polygala de restinga e cerrado

Cited by 5 publications

References 22 publications

Comparative leaf anatomy of Baccharis (Asteraceae) from high-altitude grasslands in Brazil: taxonomic and ecological implications

Comparative leaf anatomy of Baccharis (Asteraceae) from high-altitude grasslands in Brazil: taxonomic and ecological implications

Drivers of plant traits and forest functional composition in coastal plant communities of the Atlantic Forest

Soil‐associated drivers of plant traits and functional composition in Atlantic Forest coastal tree communities

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