Síndromes de dispersão de Angiospermas em uma Unidade de Conservação na Caatinga, SE, Brasil

Silva, Ana Cecília da Cruz; Prata, Ana Paula do Nascimento; Mello, Anabel Aparecida de; Santos, Ana Cláudia Alencar da Silva

doi:10.1590/s2236-89062013000400003

Cited by 15 publications

(9 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The occurrence of phenological events in some species is not determined primarily by rain but by the level of water available to the plants (Borchert & Rivera, 2001). Therefore, during the dry season, when rain is scarce, the species, as a consequence of the end of the reproductive phenophase, express all their production of dry fruits, anemochorics, small seeds, orthodox (Griz & Machado, 2001;Ragusa-Netto & Silva, 2007;Silva, Prata, Mello, & Santos, 2013;Japiassú, Lopes, Dantas, & Nóbrega, 2016).…”

Section: Resultsmentioning

confidence: 99%

Chronological analysis of the physiological quality of diaspores of Myracrodruon urundeuva Fr. All. in semiarid regions

et al. 2018

View full text Add to dashboard Cite

The objective of this study was to evaluate the physiological quality of diaspores from Myracrodruon urundeuva mother trees developing in the Cariri region of the state of Paraíba, Brazil. The seeds were collected during three consecutive years and from different areas of the Cariri region. The seed collection areas comprised two sites in the municipality of Boa Vista and one in the municipality of São João do Cariri. The diaspores had their water content determined and were submitted to the following tests: germination, seedling emergence, first count of germination and seedling emergence (within 5 days), and speed of germination and seedling emergence. The treatment means were compared using the deviance statistic. The collection years and collection areas were compared by the Tukey test at a 5% probability level. The comparison between mother trees was made through principal component analysis and cluster analysis. The detected variation in the quality of M. urundeuva diaspores is dependent on environmental conditions. The physiological quality of M. urundeuva diaspores varies according to mother tree, collection area and year. Mother trees of groups 1 and 2 are the most promising since they included representatives of all three areas and produced diaspores of high physiological quality.

show abstract

Section: Resultsmentioning

confidence: 99%

Chronological analysis of the physiological quality of diaspores of Myracrodruon urundeuva Fr. All. in semiarid regions

et al. 2018

View full text Add to dashboard Cite

show abstract

“…The pattern of dispersal syndromes may be associated with the degree of rainfall, since in Caatinga areas, which have severe droughts for the most part of the year, there is a predominance of abiotic dispersers (autochory and anemochory). Conversely, at higher altitudes, the increase in rainfall brings a greater diversity of biotic dispersers, mainly due to the offer of more fleshy and attractive fruits for animals (COSTA et al, 2004;BUTLER et al, 2007;RODAL, 2009;SILVA et al, 2013).…”

Section: Discussionmentioning

confidence: 99%

“…In tropical forests, there are many biotic and abiotic vectors responsible for seed dispersal, mainly animals, wind, and gravity. Since birds can travel long distances, they are very effective dispersers; while ants, bats, and other mammals also play important roles for shorter routes (SUMMERBELL, 1991;BUTLER et al, 2007;RODAL, 2009;SILVA et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Patterns of Seed Dispersal Syndromes at Different Altitudes in the Semiarid Region

Santos

Marangon

Freire

et al. 2020

View full text Add to dashboard Cite

The objective of this study was to assess the patterns of seed dispersal syndromes of woody plants from nine forest fragments distributed at different altitude levels on the Araripe plateau, in Pernambuco, Brazil. For data collection, we divided the altitudes within the region into three categories: lower level (altitudes ≤600 m); intermediate level (600< altitudes <750 m); and higher level (altitudes ≥750 m). We registered nine fragments, three per altitude level. In each of them, we distributed 20 rectangular sampling units with 250 m², totaling a sampling area of 4.5 ha. We quantified, collected, and identified woody plants with a diameter at breast height higher than or equal to 0.1 m (DBH 1.30 m ≥0.10 m). We characterized the dispersal syndrome according to the characteristics of the fruits and seeds and based on a literature review. In the whole region, we sampled 6,987 individuals, distributed in 35 families, 82 genera, and 153 species. Approximately 41% of all individuals are dispersed by animals, 37% by the plant’s own mechanisms, and 21% by the wind. In terms of dispersal, 47% of species were classified as zoochorous, 23% as autochorous, and 14% as anemochorous. Seed dispersal patterns vary according to altitude levels, with higher regions tending to present greater representativeness of biotic dispersers and lower ones, abiotic.

show abstract

“…Embora haja lacunas no entendimento sobre as estratégias de regeneração das mesmas, nestes ambientes secos sazonais, estas apresentam adaptações que diminuem a mortalidade das sementes e aumentam o desempenho, como dispersão no período de maior precipitação, sementes grandes para reduzir a dessecação e rápida germinação para reduzir a probabilidade de desidratação (Pritchard et al 2004) e predação (Daws et al 2005). Estas características obtidas correspondem às mesmas observadas para o feijão bravo, que apresenta dispersão zoocórica (Silva et al 2013) por mirmecoria, o que contribui ainda mais para o sucesso na regeneração em áreas de caatinga.…”

Section: Tratamentosunclassified

Teor de umidade e perda de viabilidade de sementes de Cynophalla flexuosa (L) J. Presl

Cunha¹,

Souza²,

Morais³

et al. 2019

ADV. FOR. SCI.

View full text Add to dashboard Cite

ResumoEste trabalho teve por objetivo avaliar a relação entre o teor de umidade e a perda da viabilidade e vigor de sementes de Cynophalla flexuosa, feijão-bravo, pós dispersão; bem como saber em quanto tempo após coleta e posterior secagem (a sombra e ao sol) as sementes sofrem comprometimento da viabilidade e vigor. Foram feitas coletas e realizados tratamentos diferentes às sementes coletadas, em abril de 2015, sendo executado um experimento à sombra (experimento 1) e outro ao sol (experimento 2). Usou-se quatro repetições de 25 sementes para o teste de emergência e três repetições de 30 sementes para a determinação do teor de umidade. O teor de umidade considerado como crítico foi de 30% para as sementes secas à sombra e de 27% para sementes secas ao sol, quando há o início da perda do vigor e da viabilidade. O teor de umidade letal para as sementes secas à sombra foi de 23% e de 16% para sementes secas ao sol. As sementes quando secas ao sol sofreram comprometimento na viabilidade e vigor após três dias de secagem e quando secas à sombra após seis dias. Concluiu-se que a espécie Cynophalla flexuosa, feijão-bravo, possui sementes recalcitrantes e de vida curta, pois com a diminuição do teor de umidade há uma rápida deterioração das sementes, com perda do vigor e viabilidade, impossibilitando o armazenamento por período superior a seis dias para as sementes secas à sombra e três dias para as sementes secas ao sol.

show abstract

Síndromes de dispersão de Angiospermas em uma Unidade de Conservação na Caatinga, SE, Brasil

Cited by 15 publications

References 14 publications

<b>Chronological analysis of the physiological quality of diaspores of <i>Myracrodruon urundeuva</i> Fr. All. in semiarid regions

<b>Chronological analysis of the physiological quality of diaspores of <i>Myracrodruon urundeuva</i> Fr. All. in semiarid regions

Patterns of Seed Dispersal Syndromes at Different Altitudes in the Semiarid Region

Teor de umidade e perda de viabilidade de sementes de Cynophalla flexuosa (L) J. Presl

Contact Info

Product

Resources

About