scholarly journals Reproductive phenology of Ditassa burchellii (Apocynaceae, Asclepiadoideae), a herbaceous vine, in a semi-deciduous forest from Brazil

Rodriguésia ◽  
2019 ◽  
Vol 70 ◽  
Author(s):  
Anderson Lopes Fontes ◽  
Adriano Valentin-Silva ◽  
Milene Faria Vieira
Keyword(s):  
Deciduous Forest ◽  
Abiotic Factors ◽  
Day Length ◽  
Southeastern Brazil ◽  
Reproductive Phenology ◽  
Flower Bud ◽  
Dispersal Mode ◽  
Rayleigh Test ◽  
Immature Fruit ◽  
Minas Gerais State

Abstract We analyzed the reproductive phenology of Ditassa burchellii and the influence of abiotic factors on the species phenophases. The study was conducted on individuals of a natural population from a semi-deciduous forest (Viçosa municipality, Minas Gerais state, southeastern Brazil). We quantified the activity and intensity indices of the following phenophases: flower bud, flower, immature fruit, and dehiscent fruit. To test for seasonality of phenophases, we analyzed each of them using Rayleigh test. We evaluated whether there was any association between abiotic variables (mean temperature, rainfall, and day length) and phenophases, in the month of occurrence and in the three months prior to the occurrence of each phenophase. The analyzed phenophases occurred mainly at the end of the rainy season and during the dry season, with overlapping periods, but with sequential peaks. The periods of occurrence of reproductive phenophases were similar to the ones in other climbing species and were mainly related to the dispersal mode. All phenophases were seasonal and were associated with at least one abiotic variable, either in the month of their occurrence or in the previous months.

What factors can influence the reproductive phenology of Neotropical Piper species (Piperaceae) in a semi-deciduous seasonal forest?

Botany ◽  
2018 ◽  
Vol 96 (10) ◽  
pp. 675-684 ◽  
Author(s):  
Adriano Valentin-Silva ◽  
Vanessa Graziele Staggemeier ◽  
Marco Antonio Batalha ◽  
Elza Guimarães
Keyword(s):  
Linear Models ◽  
Abiotic Factors ◽  
Day Length ◽  
Circular Statistics ◽  
Southeastern Brazil ◽  
Reproductive Phenology ◽  
Flower Buds ◽  
Climate Conditions ◽  
Flowering Phase

Plant phenophases can be modulated by abiotic factors as well as by evolutionary history. We tested the influence of factors shaping the reproductive phenology of 17 co-occurring Piper species in a semi-deciduous seasonal forest in southeastern Brazil over a 12 month period. We describe the phenology, applying circular statistics to the flowering and fruiting phenophases for each species. Mantel correlation tests were conducted to investigate the role of phylogeny in phenological responses, and the influence of abiotic variables (temperature, rainfall, and day length) was analyzed using generalized linear models. Additionally, we tested whether the presence of latent flower buds influenced flowering and fruiting times. The phenological variation across species of Piper in the reproductive stages was not phylogenetically structured. Flowering and fruiting occurred throughout the year, but higher seasonality was detected in the flowering phase, which positively correlated with long days (∼13 h). The flowering phase was shorter and occurred earlier in Piper species with latent flower buds than in species without them, probably because these species are better adjusted to respond when climate conditions are favorable for flower anthesis. Thus, abiotic factors and the presence of latent flower buds shape the reproductive phenology of Piper species.

scholarly journals COMPORTAMENTO FENOLÓGICO DE Emmotum nitens (Benth.) Miers (METTENIUSACEAE) EM FRAGMENTO DE CERRADÃO

Nativa ◽  
2018 ◽  
Vol 6 (1) ◽  
pp. 33
Author(s):  
Patrícia Oliveira da Silva
Keyword(s):  
Rainy Season ◽  
Reproductive Phenology ◽  
Fruit Maturation ◽  
Ripe Fruit ◽  
Flower Bud ◽  
Circular Statistic ◽  
Immature Fruit ◽  
Temperature And Precipitation ◽  
Continuous Reproduction ◽  
Reproductive Events

Emmotum nitens é uma espécie bem conhecida em termos de florística e fitossociologia, entretanto, há poucos trabalhos que tratam-se de sua fenologia. Este estudo buscou avaliar a fenologia reprodutiva de uma população de E. nitens no Município de Rio Verde, Goiás. Observou-se mensalmente as fenofases reprodutivas (botão, antese, fruto imaturo e maduro) de 15 indivíduos. Para a coleta dos dados utilizou-se o método de Fournier e presença/ausência, e para analisar os mesmos utilizou-se a estatística circular e correlação com as variáveis meteorológicas (temperatura e precipitação). E. nitens produziu botões e flores de modo irregular ao longo do estudo, no entanto se correlacionaram positivamente com a temperatura. Durante todo estudo registrou-se frutos imaturos, embora as maiores concentrações ocorreram na transição do período seco-chuvoso e durante as chuvas, correlacionando-se positivamente com a precipitação. A maturação dos frutos iniciou-se no final da estação das chuvas, com maiores intensidades no período seco. Para E. nitens é mais vantajoso apresentar reprodução continua já que a mesma não é fortemente limitada pelas variáveis climáticas da área de estudo, do que seguir um padrão sazonal.Palavra-chave: fenologia, espécie de cerrado, eventos reprodutivos, correlação com metereologia. PHENOLOGICAL BEHAVIOR OF EMMOTUM NITENS (BENTH.) MIERS (METTENIUSACEAE) ON CERRADÃO FRAGMENT ABSTRACT:Emmotum nitens is a well-known species in terms of floristic and phytosociology, however, there are few studies that deal with its phenology. The objective of this study was to evaluate the reproductive phenology of a population of E. nitens in the municipality of Rio Verde, Goiás. The reproductive phenomena (flower bud, anthesis, immature fruit and ripe fruit) were observed monthly in 15 individuals. Fournier method and presence/absence were used to collect the data, and to analyze them, the circular statistic and correlation with the meteorological variables (temperature and precipitation) were used. E. nitens produced flower bud and flowers irregularly throughout the study, however they correlated positively with temperature. During the whole study immature fruits were recorded, although the highest concentrations occurred in the transition from the dry-rainy season and during the rains, correlating positively with the precipitation. Fruit maturation began at the end of the rainy season, with higher intensities in the dry season. For E. nitens it is more advantageous to present continuous reproduction since it is not strongly limited by the climatic variables of the study area, rather than following a seasonal pattern.Keywords: phenology, species of cerrado, reproductive events, correlation with meteorology. DOI:

scholarly journals Fenologia e modos de polinização e dispersão de Fabaceae em floresta ciliar, Chapada Diamantina, Nordeste do Brasil

2015 ◽  
Vol 15 ◽  
Author(s):  
Isys Mascarenhas Souza ◽  
Ligia Silveira Funch
Keyword(s):  
Abiotic Factors ◽  
Pearson Correlation ◽  
Day Length ◽  
Leaf Fall ◽  
Chapada Diamantina ◽  
Immature Fruit ◽  
Dispersal Syndromes ◽  
Leaf Flushing ◽  
Leaf Flush ◽  
Reproductive Events

Phenological patterns have been described based on frequency, period and duration of the events and analyzed as a function of biotic and abiotic factors with the vegetative and reproductive cycles of plant species commonly related to the precipitation and day length. In this work, we describe the phenological strategies of 11 Fabaceae species present in gallery forests along the Lençóis River, Chapada Diamantina, Bahia State, Brazil, and investigate the environmental factors influence and pollination and dispersal modes on the phenological patterns. Observations of vegetative (leaf flushing and leaf fall) and reproductive (bud, flower, immature fruit and mature fruit) phenology were made among a group of 75 individuals based on Fournier index (24 months). Interspecific synchrony was determined based on the presence or absence of each phenophase in the individuals. Multiple linear regression analyses were conducted to investigate the influence of environmental variables on the phenophases, and Pearson correlation analysis between vegetative and reproductive events. Pollination and dispersal syndromes were defined based on field observations and literature. The species demonstrated non-seasonal vegetative and reproductive events, different of the expected for the family. However, the flowers and mature fruits (i.e., resources for pollinators and dispersal agents) were seasonal. The correlation with precipitation was positive to the leaf flush and negative to leaf fall and diaspore propagation. The leaf flushing, flowering and fruit maturation are correlated to day length. Our study reveals the occurrence of different groups of Fabaceae with distinct flowering and fruiting peaks related to pollination and dispersal syndromes, which minimize the niche overlapping among them.

Cyclamen Leaf Unfolding Rate in Response to Temperature

HortScience ◽  
1998 ◽  
Vol 33 (3) ◽  
pp. 447d-447
Author(s):  
Meriam Karlsson ◽  
Jeffrey Werner
Keyword(s):  
Day Length ◽  
Leaf Number ◽  
Cyclamen Persicum ◽  
Flower Buds ◽  
Flower Bud ◽  
Leaf Unfolding ◽  
Significant Difference ◽  
Number Of Leaves ◽  
Growth Chambers ◽  
Response To Temperature

Nine-week-old plants of Cyclamen persicum `Miracle Salmon' were transplanted into 10-cm pots and placed in growth chambers at 8, 12, 16, 20, or 24 °C. The irradiance was 10 mol/day per m2 during a 16-h day length. After 8 weeks, the temperature was changed to 16 °C for all plants. Expanded leaves (1 cm or larger) were counted at weekly intervals for each plant. The rate of leaf unfolding increased with temperature to 20 °C. The fastest rate at 20 °C was 0.34 ± 0.05 leaf/day. Flower buds were visible 55 ± 7 days from start of temperature treatments (118 days from seeding) for the plants grown at 12, 16, or 20 °C. Flower buds appeared 60 ± 6.9 days from initiation of treatments for plants grown at 24 °C and 93 ± 8.9 days for cyclamens grown at 8 °C. Although there was no significant difference in rate of flower bud appearance for cyclamens grown at 12, 16, or 20 °C, the number of leaves, flowers, and flower buds varied significantly among all temperature treatments. Leaf number at flowering increased from 38 ± 4.7 for plants at 12 °C to 77 ± 8.3 at 24 °C. Flowers and flower buds increased from 18 ± 2.9 to 52 ± 11.0 as temperature increased from 12 to 24 °C. Plants grown at 8 °C had on average 6 ± 2 visible flower buds, but no open flowers at termination of the study (128 days from start of treatments).

Comparing the potential reproductive phenology between restored areas and native tropical forest fragments in Southeastern Brazil

2021 ◽  
Author(s):  
Débora Cristina Rother ◽  
Igor Lopes Ferreira Sousa ◽  
Eliana Gressler ◽  
Ana Paula Liboni ◽  
Vinícius Castro Souza ◽  
...  
Keyword(s):  
Tropical Forest ◽  
Southeastern Brazil ◽  
Reproductive Phenology ◽  
Forest Fragments

scholarly journals Soil Mycobiome Is Shaped by Vegetation and Microhabitats: A Regional-Scale Study in Southeastern Brazil

2021 ◽  
Vol 7 (8) ◽  
pp. 587
Author(s):  
Danielle Hamae Yamauchi ◽  
Hans Garcia Garces ◽  
Marcus de Melo Teixeira ◽  
Gabriel Fellipe Barros Rodrigues ◽  
Leila Sabrina Ullmann ◽  
...  
Keyword(s):  
Fungal Community ◽  
Vegetation Index ◽  
Normalized Difference Vegetation Index ◽  
Deciduous Forest ◽  
Regional Scale ◽  
Southeastern Brazil ◽  
Transitional Region ◽  
Illumina Platform ◽  
Ecological Processes ◽  
Life On Earth

Soil is the principal habitat and reservoir of fungi that act on ecological processes vital for life on Earth. Understanding soil fungal community structures and the patterns of species distribution is crucial, considering climatic change and the increasing anthropic impacts affecting nature. We evaluated the soil fungal diversity in southeastern Brazil, in a transitional region that harbors patches of distinct biomes and ecoregions. The samples originated from eight habitats, namely: semi-deciduous forest, Brazilian savanna, pasture, coffee and sugarcane plantation, abandoned buildings, owls’ and armadillos’ burrows. Forty-four soil samples collected in two periods were evaluated by metagenomic approaches, focusing on the high-throughput DNA sequencing of the ITS2 rDNA region in the Illumina platform. Normalized difference vegetation index (NDVI) was used for vegetation cover analysis. NDVI values showed a linear relationship with both diversity and richness, reinforcing the importance of a healthy vegetation for the establishment of a diverse and complex fungal community. The owls’ burrows presented a peculiar fungal composition, including high rates of Onygenales, commonly associated with keratinous animal wastes, and Trichosporonales, a group of basidiomycetous yeasts. Levels of organic matter and copper influenced all guild communities analyzed, supporting them as important drivers in shaping the fungal communities’ structures.

A new species of Microvelia Westwood, 1834 (Hemiptera: Heteroptera: Veliidae) from southeastern Brazil

Zootaxa ◽  
2021 ◽  
Vol 4958 (1) ◽  
pp. 160-166
Author(s):  
OSÉIAS MARTINS MAGALHÃES ◽  
GUSTAVO LISBOA VIEIRA MACHADO ◽  
MARCO ANTONIO ALVES CARNEIRO ◽  
FELIPE FERRAZ FIGUEIREDO MOREIRA
Keyword(s):  
New Species ◽  
Minas Gerais ◽  
Southeastern Brazil ◽  
Minas Gerais State ◽  
A New Species

Microvelia joceliae Magalhães & Moreira, sp. nov. is described and illustrated based on material from Parque Natural Municipal das Andorinhas, Minas Gerais State, in southeastern Brazil. The new species can be distinguished from congeners occurring in the region by the pronotum of the apterous form covering almost the entire thorax dorsally, proepisternum with black denticles, male abdominal segments V–VII ventrally depressed, shape of the asymmetrical parameres, and female abdominal laterotergites reflected over the mediotergites and almost touching over segments V–VII. 

scholarly journals Effects of environmental conditions associated to the cardinal orientation on the reproductive phenology of the cerrado savanna tree Xylopia aromatica (Annonaceae)

2011 ◽  
Vol 83 (3) ◽  
pp. 1007-1020 ◽  
Author(s):  
Maria Gabriela G. Camargo ◽  
Regina M. Souza ◽  
Paula Reys ◽  
Leonor P.C. Morellato
Keyword(s):  
Edge Effects ◽  
Environmental Conditions ◽  
Fruit Production ◽  
Sensu Stricto ◽  
Southeastern Brazil ◽  
Reproductive Phenology ◽  
Canopy Openness ◽  
Cerrado Savanna ◽  
Cardinal Direction ◽  
Floral Visitation

The Brazilian cerrado has undergone an intense process of fragmentation, which leads to an increase in the number of remnants exposed to edge effects and associated changes on environmental conditions that may affect the phenology of plants. This study aimed to verify whether the reproductive phenology of Xylopia aromatica (Lam.) Mart. (Annonaceae) differs under different light conditions in a cerrado sensu stricto (a woody savanna) of southeastern Brazil. We compared the reproductive phenology of X. aromatica trees distributed on east and south cardinal faces of the cerrado during monthly observations, from January 2005 to December 2008. The east face had a higher light incidence, higher temperatures and canopy openness in relation to south face. X. aromatica showed seasonal reproduction at both faces of the cerrado, but the percentage of individuals, the synchrony and duration of phenophases were higher at the east face. The study demonstrated the influence of the environmental conditions associated to the cardinal orientation of the cerrado faces on the phenological pattern of X. aromatica. Similar responses may be observed for other species, ultimately affecting patterns of floral visitation and fruit production, which reinforces the importance of considering the cardinal direction in studies of edge effects and fragmentation.

scholarly journals Nesting Behaviour of a Neotropical Social Wasp Mischocyttarus saussurei Zikán, 1949 (Hymenoptera, Vespidae)

Sociobiology ◽  
2020 ◽  
Vol 67 (1) ◽  
pp. 121 ◽  
Author(s):  
Lucas Rocha Milani ◽  
Fabio Prezoto ◽  
Mateus Aparecido Clemente ◽  
Patrícia Pereira Gomes ◽  
Marcos Magalhães de Souza
Keyword(s):  
Morphometric Analysis ◽  
Social Wasp ◽  
Minas Gerais ◽  
Southeastern Brazil ◽  
Morphometric Data ◽  
Ecological Data ◽  
Architectural Pattern ◽  
Minas Gerais State ◽  
Nesting Behaviour

Mischocyttarus saussurei nests show a curious architectural pattern which could be related to colony camouflage. Since information on that species is scarce in literature, this study aimed to record ecological data on M. saussurei, as well as morphometric data on its nests. Data was collected at the Parque Estadual do Ibitipoca state park and at the municipalities of Barroso and Inconfidentes, Minas Gerais state, Southeastern Brazil. Seven colonies were located, exclusively in conserved environments. Five nests were dissected for morphometric analysis and for the assessment of the vegetal matter incorporated to comb walls. Nests showed comb cells opening towards the substrate and covered by vegetal layers, in which three families of mosses and three of liverworts could be identified. We deduct that the nests’ morphometry and the incorporation of vegetal layers to the combs are related to the camouflaging of colonies amidst their substrate.

scholarly journals First record of the Crested Eagle, Morphnus guianensis (Daudin, 1800) (Aves, Accipitridae) in the Cerrado of Minas Gerais state, Brazil

Check List ◽  
2015 ◽  
Vol 11 (4) ◽  
pp. 1670 ◽  
Author(s):  
Larissa Lacerda Moraes ◽  
Alexander Zaidan de Souza ◽  
Rômulo Ribon
Keyword(s):  
Atlantic Forest ◽  
New Record ◽  
First Record ◽  
Minas Gerais ◽  
The State ◽  
Southeastern Brazil ◽  
Historical Records ◽  
Minas Gerais State

We present a new record of the Crested Eagle, Morphnus guianensis (Daudin, 1800), a rare forest eagle of the Neotropics on 22 May 2012 at a Cerrado area in Minas Gerais state, southeastern Brazil. The species has only two historical records in the state, both at areas formerly covered by Atlantic Forest. The finding raises the expectations for the maintenance of the species in the state, stressing the fact that this is the first species record in a Cerrado area in Eastern Brazilian states.

Sign in / Sign up

Export Citation Format

Share Document