O gênero Adiantum (Pteridaceae) no estado do Rio de Janeiro, Brasil

Winter, Sara Lopes de Sousa; Sylvestre, Lana da Silva; Prado, Jefferson

doi:10.1590/2175-7860201162312

Cited by 13 publications

(15 citation statements)

References 13 publications

(12 reference statements)

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“…This species has a wide geographic distribution, occurring from open restinga to temperate Araucaria forests (Korte et al 2013;Gasper and Salino 2015), being more abundant along forest borders or in clearings (Korte et al 2013). On the other hand, A. pentadactylon, A. phyllitidis and D. pentagona, mainly found in shaded areas, do not corroborate evidence from other studies, which indicate that these species thrive along trails and river margins, cut slopes along roads and areas exposed to solar radiation (Boldrin and Prado 2007;Winter et al 2011). The discrepancy between our results and previous studies may be due to an isolated effect and/or association of edaphic conditions, which could have overcome the independent effect of canopy cover.…”

Section: Discussioncontrasting

confidence: 99%

The predominant role of soil in determining species composition of fern communities in subtropical coastal forest ecosystems

Carmes¹,

Dechoum²,

Fiaschi³

2019

NBC

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Ferns are an important component in the understorey of tropical forests and their distribution is influenced by several biotic and abiotic factors. At a regional scale, soil characteristics and canopy openness play an important role in fern species composition and richness, as well as in the abundance of individuals. Our objective was to compare the influence of edaphic conditions and vegetation structure on the abundance and distribution of fern communities in Atlantic forest and restinga forest. Our hypotheses were that fern species richness and diversity are higher in Atlantic forest than in restinga due to limiting conditions in this habitat and the composition of fern species in Atlantic forest differs from restinga, especially due to differences in edaphic conditions. A principal coordinates analysis was applied to ordinate sampling units in relation to the environmental variables and a permutational multivariate analysis of variance was used to test that environmental variables did not differ between the two vegetation types. Species richness was compared using rarefaction curves. The influence of abiotic variables in species composition and abundance was verified using canonical correspondence analysis. No differences were observed in species richness, diversity or dominance between vegetation types, although abundance was higher in restinga. Fern communities respond to edaphic conditions and vegetation structure variations between vegetation types, the soil playing a major role. A greater variety of habitats resulting from differences in soil drainage in restinga facilitates the co-existence of species with different ecological tolerance, increasing local diversity and compensating for limiting conditions in restinga.

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Section: Discussioncontrasting

confidence: 99%

The predominant role of soil in determining species composition of fern communities in subtropical coastal forest ecosystems

Carmes¹,

Dechoum²,

Fiaschi³

2019

NBC

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“…The most representative family was Pteridaceae with 17 species, which was also reported in two other studies carried out in Maranhão, one in areas of the Amazonian Forest (Silva Junior et al 2020) and another in areas of Cerrado (Fernandes et al 2022). The family Pteridaceae is one of the most diverse in Brazil and their genera have wide geographic distribution, because of it, it has been reported as one of the commonest in studies of ferns in Brazil (e.g., Maciel & Pietrobom 2010;Winter et al 2011;Miranda et al 2015;Menezes & Labiak 2020;Silva Junior et al 2020;Fernandes et al 2022;Flora and Funga of Brazil 2023).…”

Section: Identification Key To the Lycophyte And Fern Species In The ...supporting

confidence: 63%

Lycophytes and ferns of an Amazonian-Cerrado ecotone in Maranhão State, Northeastern Brazil: identification key and annotated list of taxa.

Silva Junior,

Prado,

Ferreira

et al. 2024

Biota Neotrop.

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We present a key to identify and an annotated list of lycophytes and ferns of the Immediate Geographical Region of São Luís, Maranhão State, which has ecotonal characteristics of Amazonian Forest, Cerrado, and Coastal Vegetation. Specimens were collected monthly between April 2020 and September 2022 in the 13 municipalities of this region. A total of 64 species were identified, including 61 species of ferns, in 18 families and 38 genera, and three species of lycophytes, in two genera and one family. The most representative families were Pteridaceae (18 species) and Polypodiaceae (nine species). The most recorded substrate of occurrence was terrestrial with 35 species (54.6%), followed by epiphytic with 15 species (23.4%), aquatic with four species (6.2%), rupicolous with three species (4.6%), and hemiepiphytic with two species (3.1%). Five species (7.8%) had more than one life form. This study expands the knowledge about the geographic distribution of fern and lycophyte species in the central region of Northern Maranhão, in Northeastern Brazil, which until now had several sampling gaps. Maranhão has a diversity that is still poorly reported and known compared to other states in South and Southeast Brazil. Therefore, floristic surveys are essential to increase what is known about the flora, especially in areas under anthropic pressure and places with few collections, such as the ecotonal areas in Maranhão.

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“…Adiantum é um gênero que ocorre principalmente no interior de florestas primárias e secundárias, desde o nível do mar até cerca de 2.000 metros de altitude (Winter et al, 2011). O gênero Cyathea, compreendendo cerca de 100 espécies, ocorre em ambientes úmidos de todas as regiões do Brasil (Windisch, 2010).…”

Section: Discussionunclassified

Tafonomia de Esporos de Pteridófitas Encontrados em Sedimentos Turfosos Quaternários do Rio de Janeiro, Brasil

2013

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ResumoA Tafonomia é uma ferramenta usada em interpretações paleoambientais que remonta ao processo de deposição dos palinomorfos. A interpretação dos processos tafonômicos fornece subsídios para a compreensão das condições ambientais passadas, através de marcas preservadas nos palinomorfos. A área de estudo localiza-se na Praia Vermelha, bairro da Urca, município do Rio de Janeiro, entrada da Baía de Guanabara. Foi estudada a preservação dos esporos ocorrentes em um perfil estratigráfico, formado por sedimentos turfosos e areno-lamosos, abrangendo o intervalo de tempo entre cerca de 4.520 a 4.270 anos A.P. Oito níveis foram selecionados e amostrados. Os esporos encontrados foram agrupados de acordo com o tipo de deterioração, em danos de corrosão/degradação, mecânicos e sem danos. A percentagem de cada tipo de dano foi calculada em relação ao total de esporos contados e a concentração em relação a 1cm 3 de sedimento. Foi encontrado um grande número de esporos com danos de corrosão e degradação, característicos de exposição ao ar, indicando ter havido ocasiões de menor disponibilidade de água no local. O predomínio de esporos sem danos em alguns níveis sugere uma sedimentação subaquosa, corroborado pelas análises sedimentológicas realizadas. Palavras-chave: Palinologia; Quaternário; esporos; palinomorfos; tafonomia AbstractTaphonomy is a tool used in palaeoenvironmental interpretations dating back to the process of palynomorphs deposition. The interpretation of taphonomic studies provides subsidies to the understanding of the environmental past conditions through the marks left on the preserved palynomorphs. The study area is located in the Praia Vermelha, Urca district, municipality of Rio de Janeiro, in the entrance of Guanabara Bay. The preservation of spores inside a columnar profile, constituted of peat and sandy mud sediments, was studied, comprising a time interval from about 4,520 to 4,270 years B.P. Eight levels were selected and sampled. The spores were classified according to the type of deterioration, by damages of corrosion and degradation and by mechanical damages. The percentage of each kind of deterioration was calculated in relation to the total number of counted spores and the concentration in relation to one cm 3 of sediment. A large number of spores presenting corrosion and degradation damages was observed, being characteristic of air exposure, indicating occasions of lower water availability in this site. The predominance of undamaged spores in some levels suggests an underwater sedimentation, corroborated by sedimentary analyses.

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O gênero Adiantum (Pteridaceae) no estado do Rio de Janeiro, Brasil

Cited by 13 publications

References 13 publications

The predominant role of soil in determining species composition of fern communities in subtropical coastal forest ecosystems

The predominant role of soil in determining species composition of fern communities in subtropical coastal forest ecosystems

Lycophytes and ferns of an Amazonian-Cerrado ecotone in Maranhão State, Northeastern Brazil: identification key and annotated list of taxa.

Tafonomia de Esporos de Pteridófitas Encontrados em Sedimentos Turfosos Quaternários do Rio de Janeiro, Brasil

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