Flora Da Reserva Ducke, Amazônia, Brasil: Pteridophyta -Selaginellaceae

Prado, Jefferson; Freitas, Carlos Alberto Oliveira de

doi:10.1590/2175-78602005568620

Cited by 8 publications

(2 citation statements)

References 2 publications

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“…), monographs (Andersson , Hagberg , Judziewicz et al . , Prado , Prado & Freitas ), comparison with voucher specimens at the INPA Herbarium, and consultation of specialists. Vouchers for each species and/or morphotypes were collected and all fertile material was deposited in the INPA Herbarium, Manaus.…”

Section: Methodsmentioning

confidence: 99%

Local Hydrological Conditions Explain Floristic Composition in Lowland Amazonian Forests

et al. 2014

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Amazonian forests harbor a large variety of understory herbs adapted to areas with different hydrological conditions, ranging from welldrained to seasonally flooded forests. The presence versus absence of flooding forms the extremes of a hydrological gradient, with various intermediate conditions, such as seasonal soil waterlogged areas, in between. We investigated the relationship between understory herbs and hydrological conditions in Central Amazonian forests using eighty-eight 250 9 2 m plots distributed along a 600-km transect. Hydrological conditions were determined regionally by precipitation and locally by topographic conditions based on drainage potential, flooding height and soil permeability (sand content). Soil cation concentration was used as a proxy for soil fertility. The floristic dissimilarities among plots were visualized by Nonmetric Multidimensional Scaling, and simple and multiple regressions were used to identify the best predictor of herb species composition. Local drainage potential was more important in determining herb species composition than soil fertility or precipitation at non-flooded and flooded sites. Flooded sites comprised a very distinctive herb species composition even when the flood height was low (0.3 m). We conclude that hydrological conditions are the primary constraint of herb distribution within this flat regional landscape with moderate amounts of soil fertility variation (0.09-2.280 cmol(+)/kg). Hydrological models that consider local water conditions explained the largest part of herb species composition. Therefore, predictions of species distribution based on large-scale climatic variables may underestimate the favorable area for understory herbs if the variation on local hydrological conditions is not considered.Abstract in Portuguese is available in the online version of this article.

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Section: Methodsmentioning

confidence: 99%

Local Hydrological Conditions Explain Floristic Composition in Lowland Amazonian Forests

et al. 2014

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“…Studies about the genus in Brazil have mainly been concentrated on the Atlantic Forest and Amazonia (Bautista 1974a, b, Castellani & Freitas 1992, Hirai & Prado 2000, Prado & Freitas 2005, Prado & Hirai 2008, Heringer et al 2016, Valdespino 2015a, b, Valdespino et al 2015, Valdespino et al 2018a, b, Valdespino 2020). Nevertheless, records from the Cerrado vegetation have been reported in the flora of the Distrito Federal (Hirai 2007), Minas Gerais (Heringer et al 2016), and recent inventories in Maranhão (Almeida et al 2020, Fernandes et al 2022.…”

Section: Introductionmentioning

confidence: 99%

Selaginella P.Beauv. (Selaginellaceae) in the state of Maranhão, northeastern, Brazil: A floristic survey and a new record for the Cerrado domain

Fernandes,

Silva Junior,

Ferreira

et al. 2023

Biota Neotrop.

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This work is a floristic study of Selaginella in Maranhão. The species survey is based on collections from fieldwork conducted between April 2006 and February 2023 and specimens from Maranhão deposited at the CCAA, HBRA, MG, and SLUI herbaria. Ten species were identified: Selaginella conduplicata, S. convoluta, S. erythropus, S. flagellata, S. gynostachya S. marginata, S. minima, S. radiata, S. simplex, and S. sulcata. We report the first record of S. gynostachya for Maranhão and the Cerrado domain in Brazil. Until now, this species was only known from areas of Amazonia. We provide a map with records, an identification key, and comments about the identification and geographic distribution of Selaginella species in Maranhão state. For the new record, we also provide photos.

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