Fatores ambientais e a germinação de espécies arbóreas do Brasil Central e de áreas disjuntas da Amazônia no bioma Cerrado

Ribeiro, Leandro do Prado

doi:10.26512/2014.10.t.18916

Cited by 2 publications

(2 citation statements)

References 137 publications

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“…Therefore, considering that M. chartacea seeds tolerate relatively low MC levels (≃5%) and have their longevity extended when they are dry stored at low temperatures, the species can be classified as having orthodox seed storage behaviour (Bewley et al , 2013). Orthodox seed storage behaviour is most common in environments subject to seasonal drought (Hong and Ellis, 1996) such as Cerrado, a biome in which orthodox behaviour predominates and is associated with the low relative humidity and drought of the dry season (Ribeiro, 2010). This storage behaviour would allow M. chartacea seeds to form a transient soil seed bank, since newly dispersed seeds would be exposed to a dry and cold period before encountering favourable conditions for germination and seedling establishment in the wet season.…”

Section: Discussionmentioning

confidence: 99%

Longevity of seeds and soil seed bank of the Cerrado tree Miconia chartacea (Melastomataceae)

Escobar

Cardoso

2015

Seed Sci. Res.

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Miconia chartacea is a widely distributed tree in Brazil, occurring at altitudes ranging from 300 m to 1900 m in the Caatinga, Cerrado and Atlantic Forest biomes. In this work we attempted to classify M. chartacea seeds regarding their behaviour during storage and their germination syndrome and to determine, from a storage test in Cerrado soil and laboratory conditions in situ and ex situ, the longevity of seeds, as well as the capacity of the species to form a soil seed bank. The results suggested that M. chartacea seeds form a transient soil seed bank in the Cerrado and can be classified as orthodox in terms of storage behaviour, although the seeds are dispersed with a relatively high water content. The life span of seeds was favoured in soil-stored seeds in comparison with dry storage at 25°C, whereas storage at low temperatures prevented a decrease of the seed's germinability with storage time (330 d). M. chartacea seeds are dispersed during the dry season and germinate during the next rainy season, which can be classified as an intermediate–dry germination syndrome. Seeds of this species are dispersed in the Cerrado when temperatures and soil moisture are relatively low, which favours the formation of a soil seed bank, considering that the seeds tolerate desiccation and their longevity is favoured by low temperatures. A transient seed bank type is favoured by the loss of viability in storage at warm temperatures linked to the rainy season, and the predictable seasonal variations in climate in the region, with germination being restricted to the beginning of the rainy season.

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“…Functioning as a refuge for plants and animals and ecologically maintaining the riparian forests during the two main seasonal periods, the dry and the rainy (Silva et al 2017). Naiman et al (1998) and Ribeiro & Walter (2008) define vegetative formations that occur along watercourses as riparian forests. Along the watercourses of the northern Caatinga, one can find a specific type of riparian forest called carnaubais, which are characterized by many evergreen species with access to underground water and a strong occurrence of the endemic 'carnaúba' palm [Copernicia prunifera (Mill.)…”

Section: Introductionmentioning

confidence: 99%

Does the carnauba-palm riverine vegetation constitute a different type of plant community in the Brazilian semiarid? An analysis of the floristic composition

Nepomuceno,

Santos

et al. 2023

Rodriguésia

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Floristic surveys are the main source of information about species composition of different vegetation types and a fundamental input of information for biogeographical studies. Within the Caatinga Domain, there are many vegetation types, of which the most conspicuous is the deciduous caatinga s.s. vegetation. However, along the watercourses of this region, one can find a type of riparian forest called Carnaubais, characterized by a larger presence of evergreen species with access to underground water and a conspicuous occurrence of the endemic “carnauba” palm (Copernicia prunifera). The present study aimed at making a floristic survey on a Carnaubal riverine habitat and a nearby caatinga s.s. site in Ceará, and perform a biogeographical comparison with other sites within the Caatinga Domain. In our study site, we identified 186 species, distributed in 135 genera and 52 families. Of the 186 species recorded, we found 123 species uniquely in the caatinga s.s. phytophysiognomy, 40 uniquely in Carnaubal and 23 in both phytophysiognomies. The most representative families were Fabaceae (31 spp.), Poaceae (15 spp.), and Euphorbiaceae (13 spp.). The UPGMA and NMDS analyses supported the idea that the Carnaubal is a habitat with distinct flora within the Caatinga Domain.

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Fatores ambientais e a germinação de espécies arbóreas do Brasil Central e de áreas disjuntas da Amazônia no bioma Cerrado

Cited by 2 publications

References 137 publications

Longevity of seeds and soil seed bank of the Cerrado tree Miconia chartacea (Melastomataceae)

Does the carnauba-palm riverine vegetation constitute a different type of plant community in the Brazilian semiarid? An analysis of the floristic composition

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