Florística de Rubiaceae em um remanescente de Floresta Atlântica do Espírito Santo, Brasil

Torres‐Leite, Filipe; Hollunder, Renan Köpp; Garbin, Mário Luís; Carrijo, Tatiana Tavares

doi:10.1590/2175-7860201869222

Cited by 6 publications

(4 citation statements)

References 32 publications

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“…A família Rubiaceae tem sido frequentemente citada como bem representada na Floresta Atlântica (Pereira e Barbosa 2004;, Borgo et al 2011, Rocha e Amorim 2012, Torres-Leite et al 2018. Sua presença está associada a áreas mais úmidas, ocorrendo em ambientes predominantemente xerófitos, apenas quando estes possuem áreas com maior disponibilidade hídrica (Alcoforado- , como em matas ciliares.…”

Section: Discussionunclassified

Análise da vegetação em área de mata ciliar no Baixo São Francisco, em Sergipe

et al. 2023

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A pressão pelo uso do solo, principalmente para expansão agropecuária e ocupação urbana, têm sido os principais obstáculos à preservação das matas ciliares. Este trabalho foi realizado com o objetivo de analisar a composição florística e a estrutura fitossociológica do estrato arbustivo-arbóreo de um fragmento de mata ciliar na região do Baixo Rio São Francisco, no estado de Sergipe. O fragmento foi analisado pelo método de amostragem sistemática, utilizando-se 25 parcelas de 400m² (20m x 20m). Todos os indivíduos com circunferência à altura do peito (CAP) igual ou superior a 6cm foram registrados, tendo seus diâmetros mensurados e alturas estimadas. As amostras de material botânico foram levadas aos herbários da Universidade Federal de Sergipe (ASE) e do Instituto de Meio Ambiente de Alagoas (MAC), onde foram identificadas e depositadas em suas coleções. As famílias com maior número de espécies foram Fabaceae, Myrtaceae, Rubiaceae e Euphorbiaceae. A espécie com o maior índice de valor de importância (IVI), foi Croton jacobinensis Baill. destacando-se também em termos de dominância, freqüência e densidade. No estrato vertical médio observou-se 75,6% do total de indivíduos. O remanescente apresentou uma diversidade consideravelmente acima do esperado para ambientes ciliares em área domínio de Caatinga, tendo a condição edáfica diretamente associada a esse aspecto florístico e estrutural, principalmente para a vegetação encontrada na região de fundo de vale.

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Section: Discussionunclassified

Análise da vegetação em área de mata ciliar no Baixo São Francisco, em Sergipe

et al. 2023

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“…The abundance and composition of the woody plant community markedly change depending on the different forest habitats (Hollunder et al., 2014). Furthermore, the study site is a small forest fragment characterized by the presence of high species richness (especially within the families Rubiaceae, Piperaceae, and Myrtaceae), and the relatively high number of endemic and endangered species (Luber et al., 2016; Torres‐Leite et al., 2018). The mean monthly precipitation is 172 mm and 30 mm in summer and winter respectively (averaged over 2009–2019, meteorological station of Alegre, ES, Brazil) and the annual precipitation is 1288 mm.…”

Section: Methodsmentioning

confidence: 99%

Vapor pressure deficit drives the mortality of understorey woody plants during drought recovery in the Atlantic Forest

Hollunder,

Garbin,

Scarano

et al. 2024

J Vegetation Science

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QuestionDrought‐induced tree mortality has been documented in forests worldwide but the mechanisms related to drought recovery are still poorly understood. To better predict forest trajectories under future climate scenarios, it is essential to disentangle physiological mechanisms underlying plant mortality caused by El Niño droughts. Here, we assessed how vegetation structure, vapor pressure deficit (VPD), and functional traits interact to mediate tree mortality after a severe drought in a tropical forest.LocationMata das Flores State Park, an Atlantic Forest fragment in southeast Brazil.MethodsWe established 20 permanent plots with contrasting vegetation structure and topography. In each plot, we measured tree abundance and diameter at breast height (DBH) of every woody plant (1–10 cm diameter) at the end of the drought, and two years after the break of drought, to calculate mortality rates during drought recovery. Hydraulic (e.g., maximum stomatal conductance to water vapor, stomatal density, etc.) and economic traits (specific leaf area, wood density, etc.) were measured on the 10 most abundant species. We also measured local air temperature and air humidity using HOBO dataloggers in each plot to calculate the VPD.ResultsThe studied Atlantic Forest understorey did not recover from the 2014–2016 drought, in terms of tree mortality. Lower VPD, driven by big trees in the valley, protected understorey plants with acquisitive economic attributes and conservative hydraulic attributes against mortality. On the other hand, higher VPD, driven by smaller trees and higher stem density on the ridge and slope, increased the mortality of understorey plants with acquisitive attributes.ConclusionRidges represent the most important fraction of the Atlantic Forest and our results suggest this type of forest is at high climate risk due to global change. Altogether, our results highlight that valleys are microclimate refuges for understorey plants and might help mitigate drought impacts in tropical forest under forecasted climate changes.

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“…In Brazil, it includes 128 genera and 1,416 species, of which 707 are endemic (Flora and Funga do Brazil, 2018). Moreover, these species are locally aggregated at small spatial scales (Sakai & Wright, 2008; Mesquita‐Neto et al, 2015; Torres‐Leite et al, 2018, 2019). Therefore, Rubiaceae is an important model for better understanding coexistence patterns between species in highly diverse tropical systems.…”

Section: Introductionmentioning

confidence: 99%

Is there a species swarm paradox? Spatial segregation of related species in the understorey of a tropical plant community

Ferreira-Santos

Carrijo

Torres‐Leite

et al. 2023

J Vegetation Science

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Question Individual plants of some highly diverse angiosperm families occur in aggregated spatial patterns in tropical plant communities, which have been defined as species swarms. Although this spatial aggregation seems paradoxical, because related species should segregate in space owing to expected ecological similarities, it has yet to be tested. We assessed whether species of the family Rubiaceae segregate in space in the understorey of a tropical plant community. Location An Atlantic Forest fragment in southeast Brazil. Methods We surveyed all local aggregates of Rubiaceae species within an 18.75‐ha plot across a topographic gradient. Based on the species abundance distribution, we used the 10 most abundant species to model their spatial patterns using univariate and bivariate spline spatial correlations. Bubble graphs were used to show how these species were distributed across the gradient. Results A total of 12,258 individuals of 47 species were found distributed in 543 local aggregates. The 10 studied species corresponded to 86% of the total abundance and were aggregated in space, at distances from 0 to 10–300 m. Pairwise comparisons revealed a segregation pattern at scales ranging from 0 to 10–230 m. Local aggregates were strongly dominated by a single species, whereas many other species occurred at very low abundances. Conclusion The studied species of Rubiaceae shared the understorey environment by occupying different portions of available space. Habitat preferences, negative interactions, dispersal limitation and priority effects may explain the observed spatial patterns. Swarms are not paradoxical because species of Rubiaceae use different microhabitats within the forest understorey.

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Florística de Rubiaceae em um remanescente de Floresta Atlântica do Espírito Santo, Brasil

Cited by 6 publications

References 32 publications

Análise da vegetação em área de mata ciliar no Baixo São Francisco, em Sergipe

Análise da vegetação em área de mata ciliar no Baixo São Francisco, em Sergipe

Vapor pressure deficit drives the mortality of understorey woody plants during drought recovery in the Atlantic Forest

Is there a species swarm paradox? Spatial segregation of related species in the understorey of a tropical plant community

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