scholarly journals Population structure of Annona coriacea Mart. (Annonaceae) in different Cerrado phytophysiognomies

2020 ◽  
Vol 11 ◽  
pp. e3330
Author(s):  
Patrícia Oliveira da Silva ◽  
Jessica Barros Cabral Valente ◽  
Patricia Lacerda Silva ◽  
Carolina Ferreira Gomes ◽  
Gisele Cristina de Oliveira Menino
Keyword(s):  
Population Structure ◽  
Distribution Pattern ◽  
Basal Area ◽  
Sensu Stricto ◽  
T Test ◽  
Savanna Woodland ◽  
Establishment Success ◽  
Adult Age ◽  
Cerrado Biome ◽  
Absolute Density

Knowing the regeneration and structure of a species in different phytophysiognomies is extremely important to understand its pattern of occurrence. In spite of its importance, this type of study is still scarce in the Cerrado biome. In this perspective, this work aimed to compare the structure of the arboreal and regenerating strata of Annona coriacea in the cerrado sensu stricto and in the cerradão (savanna woodland). For that purpose, 13 plots of 400m² were installed in each physiognomy. All individuals of A. coriacea were sampled and had their diameter and height measured. The individuals were divided into regenerating and arboreal and were distributed in classes of height and diameter. Furthermore, the absolute density and the basal area of each extract were calculated in each physiognomy. The parameters were compared using the T-test. In total, 130 individuals of A. Coriacea were sampled, with 42 regenerating individuals in the cerrado sensu stricto and 49 in the cerradão. As for the arboreal individuals, 33 were sampled in the cerrado sensu stricto and 6 in the cerradão. All evaluated parameters revealed to be significantly different for the physiognomies. Based on these results, it is possible to affirm that A. coriacea did not present a distribution pattern in the two physiognomies, although it presents a better establishment success in the cerrado sensu stricto. In the cerradão, although the seeds can germinate, the seedlings fail to develop and reach the adult age.

scholarly journals Population structure and spatial distribution of Copaifera langsdorffii Desf.

2020 ◽  
pp. 3000-3005
Author(s):  
Priscila Bezerra de Souza ◽  
Bruno Aurélio Campos Aguiar ◽  
Giuseppe Varaschim Neto ◽  
Euclides Figueredo Fonseca ◽  
Bárbara Maria Martins Santos ◽  
...  
Keyword(s):  
Population Structure ◽  
Spatial Distribution ◽  
Sensu Stricto ◽  
Dispersion Index ◽  
Cerrado Biome ◽  
J Curve ◽  
Dispersion Indices ◽  
Copaifera Langsdorffii ◽  
Morisita Index ◽  
Index Calculation

The aim of this work was to analyze the population structure and the spatial distribution of Copaifera langsdorffii Desf. in two areas of the Cerrado biome. The study was carried out in two physiognomies of the Cerrado biome: cerrado sensu stricto and cerradão, both located in the southern region of the state of Tocantins. The spatial distribution was evaluated using Morisita and dispersion indices, as well as the population structure of C. langsdorffii. We quantified 318 individuals of C. langsdorffii in the two studied areas. There were 200 individuals sampled in the cerrado sensu stricto and 118 in the area of cerradão. Regarding the type of spatial distribution of individuals of C. langsdorffii, the value found for the Morisita index was 2.67 in the physiognomy of cerrado sensu stricto, suggesting grouped spatial distribution (I >1). The dispersion index calculation showed that, in fact, the spatial distribution of the individuals sampled in the two areas was the grouped type; for the area of cerrado sensu stricto, the variance (S2) found was 24.21 and for the cerradão it was 9.67, higher than their means 10.00 and 9.67 respectively. By analyzing the age structure of the population of C. langsdorffii, we found a typical trend of the inverted-J curve, suggesting that the areas studied are self-regenerating communities composed of young and developing individuals.

scholarly journals Population structure and density of Attalea phalerata Mart. ex Spreng. (Arecaceae) in a semideciduous forest

2012 ◽  
Vol 36 (4) ◽  
pp. 637-645 ◽  
Author(s):  
Aelton Biasi Giroldo ◽  
André R. Terra Nascimento ◽  
Pedro Paulo Ferreira Silva ◽  
Gastão Viegas Pinho Júnior
Keyword(s):  
Population Structure ◽  
Distribution Pattern ◽  
Ecosystem Functioning ◽  
Natural Regeneration ◽  
Basal Area ◽  
Population Characteristics ◽  
Stable Population ◽  
Canopy Openness ◽  
Semideciduous Forest ◽  
Ontogenetic Stages

The structure of a population can be seen as the result of biotic and abiotic interacting forces. The studies of population characteristics are vital to improve the understanding of ecosystem functioning. In this study, we attempted to answer the two following questions: What are the population structure of Attalea phalerata? and Are there any influence of reproducers presence, canopy openness, declivity, basal area and soil coverage on recruitment of individuals in this population? We distinguished four ontogenetic stages in A. phalerata. Reproducers and virgins were sampled by using 25 plots (400 m²), juveniles and seedlings were sampled in sub-plots (100 m²). We found 2,328 Attalea phalerata individuals per hectare, first two ontogenetic stages accounted for 89.8% of the total, describing a relatively stable population. None of the analyzed factors were affecting the natural regeneration of Attalea phalerata in the fragment. The density and distribution pattern found for the population are probably signs of formation of oligarchic forests, moreover, the species seems to be able to colonize clearings and open areas.

scholarly journals Composição florística e estrutural de um componente arbóreo em área de cerrado, Paranã-TO

2015 ◽  
Vol 10 (5) ◽  
pp. 108
Author(s):  
A. B. M. L. Rêgo ◽  
P. B. Souza ◽  
R. R. Silva ◽  
P. L. Rêgo
Keyword(s):  
Diversity Index ◽  
Basal Area ◽  
Floristic Composition ◽  
Sensu Stricto ◽  
Importance Value Index ◽  
Importance Value ◽  
Closed Area ◽  
Absolute Density ◽  
Density Values ◽  
Individual Trees

<p>O Cerrado Brasileiro apresenta uma enorme diversidade de fitofisionomias divididas em formações florestais, savânicas e campestres. Com o objetivo de estudar a composição florística e estrutural de um fragmento de cerrado <em>sensu stricto</em>, a fim de fornecer subsídios para conservação e manejo adequado de áreas similares. Foram instaladas sistematicamente quatro parcelas de 25x100m, sendo que as mesmas foram distanciadas 25 m entre si, perfazendo um total de 1,0 hectare de área amostral. No interior das parcelas, foram amostrados todos os indivíduos arbustivo-arbóreos, com circunferência a 1,30m do solo (CAP) maior ou igual a 15 cm. Para obtenção dos parâmetros fitossociológicos densidade relativa (DR), densidade absoluta (DA), dominância absoluta (DoA), dominância relativa (DoR), frequência absoluta (FA), frequência relativa (FR), índice de valor de importância (IVI), índice de valor de cobertura (IVC), índice de diversidade de Shannon (H’) e Pielou (J). Foram amostrados 245 indivíduos, distribuídos em 29 espécies, 29 gêneros pertencentes a 20 famílias, o que corresponde a uma área basal total de 1,94 m².ha<sup>-1</sup> e densidade absoluta estimada de 327 ind.ha<sup>-1</sup>. As espécies que apresentaram maiores valores de (IVI) foram <em>Qualea parviflora</em> (38,45%), <em>Curatella americana</em> (34,53%), <em>Byrsonima verbascifolia</em> (32,20%), <em>Psidium incanescens</em> (31,89%), <em>Pterodon emarginatus </em>(18,62%) e <em>Anachardium humile</em> (18,34%). <em>Qualea parviflora</em> foi a espécie mais representativa dentro do componente arbóreo o que se conclui aos altos valores de densidade e dominância nos estratos.</p><p align="center"><strong><em>Floristic composition and structural components of a tree in closed area in the municipality of Parana-Tocantins </em></strong></p><p><strong>Abstract</strong><strong>: </strong>The Brazilian Cerrado presents a huge diversity of vegetation types divided into forests, savannas and country. In order to study the floristic and structural composition of a cerrado fragment in order to provide subsidies for conservation and proper management of similar areas. Systematically they were installed four installments of 25x100 m, being that they were spaced 25 m apart, totaling 1.0 hectare sample area. Inside the plots were sampled every shrub and individual trees with circumference at 1.30 m soil (CAP) greater than or equal to 15 cm. To obtain the Phytosociological relative density parameters (DR), absolute density (DA), absolute dominance (DoA), relative dominance (DoR), absolute frequency (AF), relative frequency (RF), importance value index (IVI) Coverage value index (CVI), Shannon diversity index (H ') and Pielou (J). We sampled 245 individuals belonging to 29 species, 29 genera belonging to 20 families, which corresponds to a basal area of 1.94 m².ha<sup>-1</sup> and estimated absolute density of 327 ind.ha<sup>-1</sup>. The species showing higher values of (IVI) were <em>Qualea parviflora</em> (38.45%), <em>American Curatella</em> (34.53%), <em>Byrsonima verbascifolia</em> (32.20%), <em>Psidium incanescens</em> (31.89%), <em>Pterodon emarginatus</em> (18.62%) and <em>Anachardium humile</em> (18.34%). <em>Qualea parviflora</em> was the most representative species within the arboreal component which is concluded to high density values and dominance in the strata.</p>

scholarly journals Paracoccidioides brasiliensis Isolated from Nine-Banded Armadillos (Dasypus novemcinctus) Reveal Population Structure and Admixture in the Amazon Basin

2021 ◽  
Vol 7 (1) ◽  
pp. 54
Author(s):  
Eduardo Bagagli ◽  
Daniel Ricardo Matute ◽  
Hans Garcia Garces ◽  
Bernardo Guerra Tenório ◽  
Adalberto Garcia Garces ◽  
...  
Keyword(s):  
Population Structure ◽  
Latin America ◽  
Endemic Area ◽  
Amazon Basin ◽  
Paracoccidioides Brasiliensis ◽  
Pathogenic Fungi ◽  
Sensu Stricto ◽  
Species Level ◽  
Dasypus Novemcinctus ◽  
Show Evidence

Paracoccidioidomycosis is an endemic fungal disease to Latin America caused by at least five species-level genotypes of Paracoccidioides, named P. lutzii, P. brasiliensis (S1a and S1b populations), P. americana, P. restrepiensis, and P. venezuelensis. In this manuscript, we report on Paracoccidioides sp. sampling efforts in armadillos from two different areas in Brazil. We sequenced the genomes of seven Paracoccidioides isolates and used phylogenomics and populations genetics for genotyping. We found that P. brasiliensis and P. lutzii are both present in the Amazon region. Additionally, we identified two Paracoccidioides isolates that seem to be the result of admixture between divergent populations within P. brasiliensis sensu stricto. Both of these isolates were recovered from armadillos in a P. lutzii endemic area in Midwestern Brazil. Additionally, two isolates from human patients also show evidence of resulting from admixture. Our results suggest that the populations of P. brasiliensis sensu stricto exchange genes in nature. More generally, they suggest that population structure and admixture within species is an important source of variation for pathogenic fungi.

scholarly journals Arctiinae moths (Lepidoptera, Erebidae) of the Emas National Park, Goiás, Brazil

2016 ◽  
Vol 16 (2) ◽  
Author(s):  
Carolina Moreno ◽  
Viviane G Ferro
Keyword(s):  
Species Richness ◽  
National Park ◽  
New Records ◽  
Vegetation Type ◽  
Sensu Stricto ◽  
Vegetation Types ◽  
Semideciduous Forest ◽  
Cerrado Biome ◽  
Center Of Diversity ◽  
High Species Richness

Arctiinae are a species-rich subfamily of moth, with approximately 1,400 species in Brazil and 723 recorded in the Cerrado biome. A list of species of these moths was compiled during three years of sampling in four vegetation types within the Emas National Park. A total of 5,644 individuals belonging to 149 species were collected. About 67% of these species are new records for the Emas National Park, 31% for the State of Goiás and 9% for the Cerrado biome. Cerrado sensu stricto and semideciduous forests have higher species richness, followed by campo cerrado and campo sujo. The vegetation type with the highest number of exclusive species was the semideciduous forest, followed by cerrado sensu stricto, campo cerrado and campo sujo. The high species richness and the high proportion of new species records for Goiás and Cerrado reinforce the importance of the Emas National Park region as a center of diversity for this group of moths. The conservation of areas not yet cleared around the Park, including the creation of new protected areas, and the establishment of ecological corridors between these areas and the Park would be strategies to preserve the fauna of these moths.

scholarly journals Contrasting Patterns of Genetic Diversity and Population Structure of Armillaria mellea sensu stricto in the Eastern and Western United States

2010 ◽  
Vol 100 (7) ◽  
pp. 708-718 ◽  
Author(s):  
Kendra Baumgartner ◽  
Renaud Travadon ◽  
Johann Bruhn ◽  
Sarah E. Bergemann
Keyword(s):  
United States ◽  
Genetic Diversity ◽  
Population Structure ◽  
Los Angeles ◽  
The United States ◽  
Sensu Stricto ◽  
Western United States ◽  
Eastern United States ◽  
Armillaria Mellea ◽  
Genetic Pools

Armillaria mellea infects hundreds of plant species in natural and managed ecosystems throughout the Northern hemisphere. Previously reported nuclear genetic divergence between eastern and western U.S. isolates is consistent with the disjunct range of A. mellea in North America, which is restricted mainly to both coasts of the United States. We investigated patterns of population structure and genetic diversity of the eastern (northern and southern Appalachians, Ozarks, and western Great Lakes) and western (Berkeley, Los Angeles, St. Helena, and San Jose, CA) regions of the United States. In total, 156 diploid isolates were genotyped using 12 microsatellite loci. Absence of genetic differentiation within either eastern subpopulations (θST = –0.002, P = 0.5 ) or western subpopulations (θST = 0.004, P = 0.3 ) suggests that spore dispersal within each region is sufficient to prevent geographic differentiation. In contrast to the western United States, our finding of more than one genetic cluster of isolates within the eastern United States (K = 3), revealed by Bayesian assignment of multilocus genotypes in STRUCTURE and confirmed by genetic multivariate analyses, suggests that eastern subpopulations are derived from multiple founder sources. The existence of amplifiable and nonamplifiable loci and contrasting patterns of genetic diversity between the two regions demonstrate that there are two geographically isolated, divergent genetic pools of A. mellea in the United States.

scholarly journals Populational Structure of Eugenia sp. in Paraban Semiarid of State, Brazil

2019 ◽  
pp. 1-5
Author(s):  
André Japiassú ◽  
Josimar Gomes Dantas ◽  
Francisco de Oliveira Mesquita ◽  
Adriana Araújo Diniz ◽  
Anailson de Sousa Alevs ◽  
...  
Keyword(s):  
Basal Area ◽  
Ground Level ◽  
Aggregation Index ◽  
Aggregation Pattern ◽  
Disturbed Areas ◽  
Cluster Area ◽  
Absolute Density ◽  
History Of ◽  
Number Of Individuals ◽  
Vegetation Mosaics

The genus Eugenia presents one of the most important in Myrtaceae family, expressing a potential nutritional high and in drugs obtaining. The plants are resist and resist disease, their hardwood has been used to produce posts, stakes, poles, firewood and charcoal. The objective of this present work was to conduct a survey of the population structure of Eugenia sp. was conducted in caatinga area, located in the municipality of Caturité, PB. Were sampled Forty plots of 10x20 m, totaling a sample area of 8.000 m². All shrub-tree individuals were inventoried by the taking the ground level diameter (DNS), height and number of tillers. The vegetation structure was evaluated by basal area, absolute density, absolute frequency and aggregation index of the species. A total of 741 individuals of Eugenia sp. Distributed in four vegetation mosaics with a history of different uses, which were conventionally approached as: A I = Abandoned quarry area; A II = Bottom of the valley; A III = Conserved Area and A IV = Capoeira Area. Area I presented a total of 92 individuals sampled in the 10 experimental plots (DA = 460), where in this environment the species tended to cluster, Area II presented 124 individuals (DA = 620) and the McGuines index expressed that in this environment the species finds grouped. In Area III, 480 individuals were sampled with an absolute density of 2,400 ind. ha-1 grouped. The density of Eugenia sp. Was performed descriptive statistical analysis. It is different in vegetation mosaics due to the history of land use in the studied areas. The largest number of individuals of Eugenia sp. is concentrated in the conserved area showing aggregation pattern. In all areas of study, individuals have low stem diameter, expressing the importance of the species in the regeneration of disturbed areas. In the quarry area are the individuals with higher height.

scholarly journals Variação temporal de nutrientes N P K na serapilheira de duas fisionomias do domínio cerrado, Gurupi - TO

2016 ◽  
Vol 11 (3) ◽  
pp. 39
Author(s):  
Paulo Ricardo Teixeira ◽  
Rômullo Quirino de Souza Ferreira ◽  
Marília Oliveira Camargo ◽  
Priscila Bezerra de Souza ◽  
Rodrigo De Castro Tavares
Keyword(s):  
Time Variation ◽  
Rainy Season ◽  
Riparian Forest ◽  
Nutrient Content ◽  
Sensu Stricto ◽  
The Other ◽  
University Campus ◽  
Cerrado Biome ◽  
Nutrient Levels ◽  
Nitrogen Nutrients

<p>objetivou-se avaliar o retorno de macronutrientes (N, P, K) produzido em duas fisionomias do domínio Cerrado, sendo, uma fisionomia de cerrado <em>sensu stricto</em> (<em>s.s</em>) e outra de mata ciliar, ambas as áreas localizadas na Fazenda Experimental da Universidade Federal do Tocantins, <em>Campus</em> de Gurupi - TO. As amostras foram submetidas a análise de rotina para os macronutrientes N, P e K. Os maiores valores de precipitação foram registrados no período de novembro de 2012 a abril de 2013. Os maiores teores de nutrientes na fisionomia cerrado <em>sensu stricto</em> foram depositadas no final da estação seca.  Os menores teores de nutrientes foram encontrados no início da estação chuvosa. Na fisionomia de mata ciliar os teores de nutrientes nitrogênio e fósforo ocorreram de forma variável. A folha foi a fração que apresentou maior teor de nutrientes devido à grande deposição de serapilheira que ela apresentou durante o período de estudo.</p><p align="center"><strong><em>N P K nutrientes time variation of leaflitter from two cerrado biome physiognomies in Gurupi - TO</em></strong></p><p><strong>Abstract</strong><strong>: </strong>this study aimed to evaluate the return of macronutrients (N, P, K) produced in two Cerrado biome physiognomies, being one cerrado stricto sensu (ss) and the other Riparian forest, both areas located at the Experimental Farm of the Tocantins Federal University, Campus of Gurupi - TO. Samples were sent to the UFT Gurupi Campus Soils Laboratory - TO, where routine analysis for macronutrients N, P and K took place. The highest precipitation amounts were recorded in the period from November 2012 to April 2013. The highest nutrient levels in the cerrado stricto sensu were deposited at the end of the dry season. The lower levels of nutrients were found in beginning of the rainy season. In the riparian physiognomy the contents of phosphorus and nitrogen nutrients occurred in varying degrees. The leaf fraction showed the highest nutrient content due to the large deposition of litter it presented during the study period.</p>

scholarly journals Floristic survey of the Brazilian Ages Memorial: a Cerrado sensu stricto area with an educational relevance

Check List ◽  
2015 ◽  
Vol 11 (4) ◽  
pp. 1689 ◽  
Author(s):  
Thaís N.C. Vasconcelos ◽  
Juliana S. Silva ◽  
Marcelo L. Ianhez ◽  
Carolyn E. B. Proença
Keyword(s):  
Hot Spots ◽  
Sensu Stricto ◽  
Survey Area ◽  
Floristic Survey ◽  
Cerrado Biome ◽  
The World ◽  
Educational Programmes ◽  
Distrito Federal

The Cerrado Biome is currently classified as one of the most diverse savannas in the world. The anthropic destruction of this biome led the Cerrado to be recognized as one of the world’s hot spots for bioconservation. Cerrado sensu stricto phytophysiognomy represents 70% of the original Cerrado Biome surface and floristic surveys are basic and important studies for conservation initiatives in these areas. Our survey area is a Cerrado sensu stricto of 6 ha attached to the Memorial das Idades do Brasil, an open air museum located in Distrito Federal, in the center of the Cerrado Biome. Our list counted 225 species of angiosperms, with the families Fabaceae, Asteraceae, Malpighiaceae and Myrtaceae being the richest ones. Our work contributes towards a better understanding of the Cerrado biome and also may help future educational programmes in the museum. 

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