OBSERVATIONS ON THE VEGETATION OF NORTHEASTERN MATO GROSSO, BRAZIL. IV. AN ANALYSIS OF THE CERRADO–AMAZONIAN FOREST ECOTONE

2006 ◽  
Vol 63 (2-3) ◽  
pp. 323-341 ◽  
Author(s):  
B. S. MARIMON ◽  
E. DE S. LIMA ◽  
T. G. DUARTE ◽  
L. C. CHIEREGATTO ◽  
J. A. RATTER
Keyword(s):  
Woody Species ◽  
Sensu Stricto ◽  
Dry Forest ◽  
Conservation Areas ◽  
Important Species ◽  
Mato Grosso ◽  
Amazonian Forest ◽  
Forest Clearing ◽  
Type Of Transition ◽  
Made In

A study was made of the transition between the cerrado and Amazonian forest biomes on the Serra do Roncador in the northeast of Mato Grosso State, Brazil. The transition was sampled by recording the species and circumference at breast height (cbh) of all woody species ≥ 15 cm cbh on five 20 × 10 m plots in each of the following four communities: ecotonal vegetation (Cerradão areas 1 and 2), and forest (Forest areas 1 and 2); while in the Cerrado sensu stricto a more rapid method had to be used because of time constraints. A total of 138 species was recorded and the results were analysed using Sørensen and Morisita Indices, TWINSPAN and DCA. In addition, comparisons were made with data from studies undertaken in 1968 in the same area by the Xavantina-Cachimbo Expedition. No species was common to all communities sampled but a seral succession of important species occurs along the transition. The Sørensen and Morisita Indices demonstrate this, with the Cerrado s.s. and Forest 2 at the two extremes showing no species in common (zero similarity) and Cerradão 1 and 2 giving the very high figures of Sørensen 0.64 and Morisita 0.84. The ecotonal cerradão is a very characteristic Dystrophic facies cerradão with Hirtella glandulosa, Emmotum nitens, Sclerolobium paniculatum and Vochysia haenkeana as its typical indicator species. The ecotone studied in the present work represents the comparatively abrupt transition from cerrado to the peripheral form of Amazonian forest (dry forest, mata seca) on flat terrain with a uniform very dystrophic soil. Other workers have suggested that this type of transition may be restricted to the headwaters of the Xingu basin, but one of the present authors has seen similar vegetation at localities in Maranhão, Rondônia, and on the Mato Grosso–Rondônia border. Comparison of the present vegetation with the survey made in 1968 shows that in this area the advancing face of the Amazonian forest has extended about 7 km southwards into the cerrado. However, in the majority of places this process has been obscured by forest clearing for agriculture. The study draws attention to the urgent need for the establishment of conservation areas in this extremely threatened and very little studied ecotone.

VEGETATION SUCCESSION IN THE CERRADO–AMAZONIAN FOREST TRANSITION ZONE OF MATO GROSSO STATE, BRAZIL

2015 ◽  
Vol 73 (1) ◽  
pp. 83-93 ◽  
Author(s):  
P. S. Morandi ◽  
B. H. Marimon-Junior ◽  
E. A. de Oliveira ◽  
S. M. Reis ◽  
M. B. Xavier Valadão ◽  
...  
Keyword(s):  
Transition Zone ◽  
Transition Process ◽  
Sensu Stricto ◽  
Pioneer Species ◽  
Forest Transition ◽  
Important Species ◽  
Mato Grosso ◽  
Amazonian Forest ◽  
Tree Data ◽  
Soil Level

The occurrence of cerrado (as tree and shrub savanna is called in Brazil) and forest formations side by side is common at the southern margin of the Brazilian Amazonian Forest, and previous studies have demonstrated the advance of forests over cerrado areas. The aim of the present study is to provide an accurate documentation of the transition process between the two major biomes. Tree data (≥ 5 cm diameter at 0.3 m above soil level) from three plots of cerrado sensu stricto lying near three of cerradão (the taller, denser form of cerrado) were inventoried starting in 2002 in an area of 1.5 ha made up of 150 subplots of 10 × 10 m (50 in each area). This showed that the most important species of the cerradão were invading areas previously occupied by smaller, lower forms of cerrado (although it is sometimes difficult to define which are ‘forest’ and which ‘cerrado’ species as many are flexible in size – for instance Emmotum nitens can often be intermediate, establishing in cerrado that develops into cerradão and on to forest). Some typical species such as Eriotheca gracilipes and Emmotum nitens, established since the first inventories, have increased their populations (between 27 and 210%). Tachigali vulgaris, a typical, weedy, adventive species of the Cerrado–Amazonian Forest transition, showed the largest increase in abundance in areas of cerrado sensu stricto (between 100 and 1200%), and is probably the most important pioneer species in the initial advance of the forest into cerrado at the Southern Amazonian border.

Observations on the vegetation of northeastern Mato Grosso: I. The woody vegetation types of the Xavantina-Cachimbo Expedition Area

1973 ◽  
Vol 266 (880) ◽  
pp. 449-492 ◽  
Keyword(s):  
Water Table ◽  
Dry Season ◽  
Dry Forest ◽  
Woody Vegetation ◽  
Vegetation Types ◽  
Gallery Forest ◽  
Forest Types ◽  
Mato Grosso ◽  
Amazonian Forest ◽  
Base Camp

The Xavantina-Cachimbo Expedition worked during 1967-9 in a 20 km square around a base camp (12° 49' N, 51° 46' W), ca . 260 km north of Xavantina (NE Mato Grosso) and near Xavantina itself. The vegetation is of special interest because the base camp is situated near the junction of the savanna region of Central Brazil and the Amazonian forest. It is a pattern of savanna (cerrado), savanna woodland (cerradão), forest and treeless grassland (campo) with often remarkably abrupt boundaries between the different communities. Until 1967 the area had been very little affected by man. The climate is characterized by high temperature throughout the year, an annual rainfall of about 1200 to 1400 mm, and a more or less rainless dry season from June to September inclusive. During the dry season the cerrado, campo and some forms of cerradao vegetation are subject to fire, but are not burned every year. The forest, except the Deciduous Seasonal forest, is not normally burned. The rocks consist of sandstones overlying shale and mudstones. The sandstone weathers to form widespread dystrophic soils of low nutrient content, whilst the finer textured rocks, exposed in some deeper valleys, produce somewhat richer mesotrophic soils. The woody vegetation types of dystrophic soils are classified into three types of Evergreen Seasonal forest (‘Swampy Gallery' forest,‘Valley' forest and ‘Dry' forest), cerradão and cerrado. The Swampy Gallery forest is found along streams where the water table is close to the surface even in the dry season and is often bordered on one or both sides by strips of campo. In composition it resembles an impoverished Amazonian rain forest. The top-storey is dominated by Qualea ingens and Q. wittrockii , growing sometimes to 40 m, and the undergrowth includes numerous dicotyledons, Scitamineae, grasses and other monocotyledons. At a slightly higher level in stream valleys there is another type of tall forest, Valley forest, in which characteristic trees (all growing to about 40 m) are Apuleia molaris, Copaifera langsdorfii, Hymenaea stilbocarpa and Ormosia sp. (Tento). Much the most extensive type of Evergreen Seasonal forest is the Dry forest which represents the southern fringe of the Amazonian forest and covers a vast area stretching away northwards from the base camp area. This is a mixed community in which the trees seldom grow to more than 20 m. The most abundant species of the upper storey in the area studied are C haetocarpus echinocarpus, Licania blackii, L. kunthiana, Saco glottis guianensis and Xylopia amazonica . The transition from Dry forest to cerrado is sometimes abrupt, but elsewhere there is an ecotone in which Hirtella glandulosa cerradão forms a recognizable nodum, occupying a zone up to 4 km wide. Characteristic species in this are Emmotum nitens, Sclerolobium paniculatum and Vochysia haenkeana , as well as H. glandulosa . The boundary between cerrado and Dry forest appears to be dynamic and there are some indications that the forest has recently invaded the cerrado. The present boundary does not seem to be primarily dependent on climate or burning but shows some relation to soil conditions, though apart from a higher clay content in the latter the cerrado and forest soils are much alike. Cerrado has a lower degree of crown cover than cerradão; it is a type of open savanna with grassy undergrowth and is extremely variable in floristic composition and no clearly defined associations could be recognized. The boundary between cerrado and campo in valleys is sharp and appears to be determined by the height of the water table in the wet season. The mesotrophic soils are occupied by Deciduous Seasonal forest, the only woody community in the area in which the top storey becomes leafless in the dry season. The fioristic composition of this community is very different from that of the other forest types and characteristic top-storey species include Cedrela fissilis, Piptadenia macrocarpa, Platypodium elegans and Sterculia striata , with Acacia polyphylla and Bauhinia cupulata as a second storey. Bamboos and the palm Acrocomia sp. are features of the undergrowth. Floristically this community is similar to forest types found on calcareous rocks in Goiás and Minas Gerais. It is fringed by a characteristic cerradão, termed Magonia pubescens / Callisthene fasciculaia cerradão.

OBSERVATIONS ON THE VEGETATION OF MATO GROSSO, BRAZIL. V. CHANGES IN THE WOODY SPECIES DIVERSITY OF A FOREST IN THE CERRADO–AMAZONIAN FOREST TRANSITION ZONE AND NOTES ON THE FORESTS OF THE REGION

2012 ◽  
Vol 69 (2) ◽  
pp. 239-253 ◽  
Author(s):  
H. A. Mews ◽  
B. S. Marimon ◽  
J. A. Ratter
Keyword(s):  
Species Diversity ◽  
Floristic Composition ◽  
Woody Species ◽  
Permanent Plots ◽  
Ecological Groups ◽  
Forest Transition ◽  
Mato Grosso ◽  
Amazonian Forest ◽  
Semideciduous Seasonal Forest ◽  
Amazonian Forests

The changes in floristic composition, richness, species diversity and ecological groups of a semideciduous seasonal forest located at 14°49′32″S 52°06′20″W in the Cerrado–Amazonian Forest transition, in the area of Nova Xavantina, eastern Mato Grosso, Brazil, were determined between 2003 and 2008. Sixty permanent plots of 10 × 10 m were established, where the individuals with diameter at breast height (dbh) ≥ 5 cm were recorded and identified. The changes in floristic composition over the period were small and species losses and gains were limited to those of low abundance. The species richness and diversity did not change during this period and observations over a longer period will be necessary to determine whether it is a static community or in a succession towards the relatively nearby Amazonian forests. A review of existing works on the transition forest of Mato Grosso is also given.

scholarly journals Phytogeographical patterns of dry forests sensu stricto in northern Minas Gerais State, Brazil

2013 ◽  
Vol 85 (2) ◽  
pp. 623-634 ◽  
Author(s):  
DANIEL M. ARRUDA ◽  
WALNIR G. FERREIRA-JUNIOR ◽  
REINALDO DUQUE-BRASIL ◽  
CARLOS E.R. SCHAEFER
Keyword(s):  
Late Quaternary ◽  
Sensu Stricto ◽  
Minas Gerais ◽  
Dry Forest ◽  
Floristic Similarity ◽  
Humid Forest ◽  
Quaternary Climate ◽  
Dominant Soil ◽  
Minas Gerais State ◽  
Semi Arid

The Deciduous Complex that occurs in northern Minas Gerais State, Brazil, raises questions about the floristic affinities of these formations in relation to neighboring phytogeographical domains. Little is known about the identity of the seasonal forest formations that comprise this complex, or about its relationships to abiotic components, such as soils, topography and climate. This study aimed to recognize the patterns of floristic similarity of all studied fragments of dry forest of northern Minas Gerais with soil and climate attributes, based on the available database. Cluster analysis indicated the existence of two floristic groups that had clear associations with either the Koppen's BSh (semi-arid) or Aw (seasonal tropical) climates. Likewise, the subdivisions of these groups showed clear associations with the dominant soil classes in the region. The Red-Yellow Latosol is the dominant soil classes in the BSh climatic domain, seconded by alluvial areas associated with Fluvic Neosols. The Aw domain comprised a much varied set of soils: Nitosols, Argisols, Cambisols and Litholic Neosols, most derived from the Bambuí limestone/slate formation. The ecotonal nature of northern Minas Gerais State provides a complex interaction between the flora of neighboring phytogeographical domains. This, allied to pedogeomorphological factors, allowed a better understanding of the effects of late Quaternary climate changes for the Deciduous Complex evolution. We conclude that the Latosols under present-day semi-arid climates (BSh) are relicts of former wetter climates, during which humid forest (semideciduous) expansion took place. Later, these semideciduous forests were subjected to a much drier climate, when selection for deciduousness led to the present-days Deciduous Complex scenario.

scholarly journals Analyses of separate and concatenated cox1 and 18S rRNA gene sequences indicate that the bat piroplasm Babesia vesperuginis is phylogenetically close to Cytauxzoon felis and the ‘prototheilerid’ Babesia conradae

2018 ◽  
Vol 66 (1) ◽  
pp. 107-115 ◽  
Author(s):  
Sándor Hornok ◽  
Alexandra Corduneanu ◽  
Jenő Kontschán ◽  
Katinka Bekő ◽  
Krisztina Szőke ◽  
...  
Keyword(s):  
Phylogenetic Trees ◽  
18S Rrna ◽  
Phylogenetic Analyses ◽  
18S Rrna Gene ◽  
Sensu Stricto ◽  
Rrna Gene ◽  
Sequence Comparisons ◽  
Important Species ◽  
Cytauxzoon Felis ◽  
Phylogenetic Status

Babesia vesperuginis is the only piroplasm known to infect bats. Unlike most members of the genus Babesia, it is probably transmitted by a soft tick species (i.e. Argas vespertilionis). Recently, two studies have been conducted to clarify the phylogenetic status of this species, and both agreed on placing it into a basal position among Babesia sensu stricto (s.s.). However, several important groups of piroplasms were not included in the already reported phylogenetic trees of B. vesperuginis isolates. Therefore, the aim of the present study was to amplify an approx. 950-bp fragment of the cytochrome c oxidase subunit 1 (cox1) gene of B. vesperuginis from A. vespertilionis specimens, and to compare its sequences with those from other piroplasmid groups in a broader phylogenetic context. Sequence comparisons focusing on either 18S rRNA or cox1 genes, as well as phylogenetic analyses involving separate and concatenated 18S rRNA and cox1 sequences indicate that B. vesperuginis is more closely related to the phylogenetic group of Theileriidae than to Babesia s.s. In particular, B. vesperuginis clustered closest to Cytauxzoon felis and the ‘prototheilerid’ B. conradae. The results of this study highlight that B. vesperuginis is a unique and taxonomically important species, which should be included in future studies aimed at resolving the comprehensive phylogeny of Piroplasmida.

scholarly journals Accessibility Residence of Disabled People to the Health Unit

2019 ◽  
Vol 21 (3) ◽  
pp. 255
Author(s):  
Vagner Ferreira do Nascimento ◽  
Rosângela Aparecida Gonçalves ◽  
Walber Gineli de Jesus ◽  
Bianca Carvalho da Graça ◽  
Ana Cláudia Pereira Terças-Trettel ◽  
...  
Keyword(s):  
Social Inclusion ◽  
Family Health ◽  
Disabled Persons ◽  
Northern Region ◽  
Measuring Instruments ◽  
Health Unit ◽  
Mato Grosso ◽  
The Family ◽  
The Disabled ◽  
Made In

AbstractThe objective of the study was to know the accessibility of people with disabilities to the family health unit. This is an observational, descriptive study with a qualitative approach. Made in suburban neighborhoods in the largest municipality in the northern region of Mato Grosso. Data collection took place in March 2016, through an observation script and measuring instruments. The images were interpreted by iconographic analysis. It has been verified that the route of the residence of the disabled to the health unit, has many obstacles that can make the circulation unfeasible. This fact gives these people the tendency to lose their autonomy, since there will be the need of third parties help. Thus, they end up risking amid urban imperfections and irregularities and this trend to entail new possibilities of damages. They can also opt for other routes with fewer barriers, but more distant and dangerous. It is undeniable that the best way to reduce barriers is the movement of social inclusion, particularly in the planning of buildings and public mobility with greater accessibility, in the knowledge / reflection of the needs of the disabled person, support to families and articulation with the present social devices in the community. In addition, health professionals, especially nurses, play a key role in establishing links, so they can devise strategies to minimize such obstacles, while at the same time relieving moments of anguish and pain.Keywords: Health Services Accessibility. Disabled Persons. Architectural Accessibility.ResumoO objetivo do estudo foi conhecer a acessibilidade de pessoas com deficiência da residência à unidade de saúde da família. Trata-se de estudo observacional, descritivo e com abordagem qualitativa. Realizado em bairros de periferia no maior município da região médio norte de Mato Grosso. A coleta de dados ocorreu em março de 2016, mediante roteiro de observação e instrumentos de medição. As imagens foram interpretadas pela análise iconográfica. Verificou-se que o percurso da residência das pessoas com deficiência à unidade de saúde, possui muitos obstáculos que podem inviabilizar a circulação. Esse fato propicia à essas pessoas tendência a perder sua autonomia, visto que, haverá necessidade do auxílio de terceiros ajuda. Assim, acabam se arriscando em meio as imperfeições e irregularidades urbanísticas e isso tende a acarretar novas possibilidades de danos. Podem ainda, optar por outros trajetos com menos barreiras, porém mais distantes e perigosos. É inegável que a melhor forma de redução das barreiras seja o movimento de inclusão social, particularmente no planejamento de edificações e mobilidade pública com maior acessibilidade, no conhecimento/reflexão das necessidades da pessoa com deficiência, apoio às famílias e articulação com os dispositivos sociais presentes na comunidade. Além disso, o profissional de saúde, em especial os enfermeiros, possuem papel fundamental no estabelecimento de vínculos, logo podendo traçar estratégias para minimizar tais obstáculos, e ao mesmo tempo aliviar momentos de angústia e dor.Palavras-chave: Acesso aos Serviços de Saúde. Pessoas com Deficiência. Estruturas de Acesso.

scholarly journals Chronic Disturbance in a Tropical Dry Forest: Disentangling Direct and Indirect Pathways Behind the Loss of Plant Richness

2021 ◽  
Vol 4 ◽  
Author(s):  
Andrea Jara-Guerrero ◽  
Diego González-Sánchez ◽  
Adrián Escudero ◽  
Carlos I. Espinosa
Keyword(s):  
Species Richness ◽  
Structural Equation ◽  
Structural Equation Models ◽  
Woody Species ◽  
Biodiversity Loss ◽  
Dry Forest ◽  
Seasonally Dry ◽  
Causal Pathways ◽  
Large Trees ◽  
Chronic Disturbance

Chronic disturbance is widely recognized as one of main triggers of diversity loss in seasonally dry tropical forests (SDTFs). However, the pathways through which diffuse disturbance is acting on the forest are little understood. This information is especially demanded in the case of vanishing Neotropical seasonally dry forests such as the Tumbesian ones. We proposed a conceptual model to analyze the factors behind the loss of woody species richness along a forest disturbance gradient, explicitly considering the existence of direct and indirect causal pathways of biodiversity loss. We hypothesized that the chronic disturbance can act on the woody species richness directly, either by selective extraction of resources or by browsing of palatable species for livestock, or indirectly, by modifying characteristics of the forest structure and productivity. To test our model, we sampled forest remnants in a very extensive area submitted to long standing chronic pressure. Our forests cells (200 × 200 m) were characterized both in terms of woody species composition, structure, and human pressure. Our structural equation models (SEMs) showed that chronic disturbance is driving a loss of species richness. This was done mainly by indirect effects through the reduction of large trees density. We assume that changes in tree density modify the environmental conditions, thus increasing the stress and finally filtering some specific species. The analysis of both, direct and indirect, allows us to gain a better understanding of the processes behind plant species loss in this SDTF.

scholarly journals Community structure and comparative analysis of the woody component of a cerrado remnant in Southeastern Brazil

Hoehnea ◽  
2010 ◽  
Vol 37 (2) ◽  
pp. 199-210 ◽  
Author(s):  
Katia Losano Ishara ◽  
Rita de Cassia Sindrônia Maimoni-Rodella
Keyword(s):  
Multivariate Analysis ◽  
Deciduous Forest ◽  
Floristic Composition ◽  
Structural Heterogeneity ◽  
Sensu Stricto ◽  
Southeastern Brazil ◽  
Basal Diameter ◽  
Important Species ◽  
Paulo State ◽  
Geographical Position

The aims of the present work were to carry out a floristic-structural study of the shrubby-arboreal component of a savanna fragment (cerrado sensu stricto) in São Paulo State, Southeastern Brazil, and to compare with other areas. Twenty one plots of 250 m² each were delimited and plants with stem basal diameter equal or superior to 3 cm were included in the sampling. The recorded individuals corresponded to 3,062 and 58 species belonging to 34 families were registered. Asteraceae had the largest number of species (seven), followed by Fabaceae and Myrtaceae (five each). The most important species were Tibouchina stenocarpa and Anadenanthera falcata. The floristic composition of the study area indicates that it might be considered a transition from cerrado to seasonal semi-deciduous forest. The comparison with other surveys indicates floristic-structural heterogeneity of these cerrado areas and the multivariate analysis showed that areas grouped according to their geographical position and soil type.

scholarly journals SYSTEMATIC REVIEW: THE MAIN METHODS OF RESTITUTION OF DEGRADED AREAS IN THE CERRADO

2021 ◽  
Vol 6 (2) ◽  
pp. 93
Author(s):  
Gabrielli De Almeida Santos ◽  
Jaçanan Eloisa De Freitas Milani
Keyword(s):  
Systematic Review ◽  
Sensu Stricto ◽  
Minas Gerais ◽  
Direct Seeding ◽  
Google Scholar ◽  
Mato Grosso ◽  
Deforestation Rates ◽  
Research Platform ◽  
Distrito Federal ◽  
Mato Grosso Do Sul

The Cerrado occupies 24% of the Brazilian territory, half Amazon extension, and despite having the richest flora among the world’s savannas, it has been suffering deforestation rates as same as Amazon. Consequently, it is estimated that 57% of Cerrado is degraded. In this context, the present paper aimed to accomplish a systematic review of the last 10 years which answered the following question: “what are the main methods of restitution of degraded areas in the Cerrado?”. Therefore, the methodology was divided into 5 stages: papers identification in the research platform Google Scholar; title screening to exclude duplicates; variable eligibility; inclusion and analysis. Within the 44 analyzed papers, the biggest amount of publication occurred in 2011. Distrito Federal, Minas Gerais e Mato Grosso do Sul were the states with more publications. The most studied Cerrado physiognomic vegetation was the Cerrado sensu stricto. Active restitution was the most abundant. 80% of the papers were labelled as restoration and the rest as recovery. Based on this study it is conclude that the most used restitution method in the Cerrado degraded areas was the active restoration with drift planting and direct seeding.

scholarly journals Woody species distribution across a savanna-dry forest soil gradient in the Brazilian Cerrado

2023 ◽  
Vol 83 ◽  
Author(s):  
G. A. Paula ◽  
E. Fischer ◽  
M. Silveira ◽  
H. Almeida ◽  
E. van den Berg
Keyword(s):  
Species Distribution ◽  
Species Turnover ◽  
Woody Species ◽  
Dry Forest ◽  
Base Saturation ◽  
Available Phosphorus ◽  
Sharp Transition ◽  
Physical Chemical ◽  
Aluminum Saturation ◽  
Chemical Traits

Abstract Although richness and distribution of woody species in the Cerrado physiognomies have been extensively studied, the shifts of woody species from savanna physiognomies to dry forests have not yet been addressed. Here, we investigate the effect of soil physical-chemical traits on the woody species turnover between adjacent cerrado stricto sensu and dry forest physiognomies. Woody species were surveyed, and soil and topographic variables measured, in 30 10×40 m plots systematically distributed, with 15 plots in each physiognomy. We found a spatially structured distribution of woody species, and differences of soil traits between cerrado stricto sensu and dry forest areas, mainly related to the aluminum saturation, base saturation, and available phosphorus. Aluminum saturation increased toward the savanna area, while base saturation increased toward the dry forest. Most woody species predominated in one physiognomy, such as Callisthene major in the cerrado stricto sensu and Anadenanthera colubrina in the dry forest. Only 20% of the species were widely distributed across both physiognomies or, not often, restricted to the intermediary values of the soil gradient. General results indicate that contrasting soil traits between cerrado stricto sensu and dry forest produce a strongly spatially organized and sharp transition in terms of species distribution between these physiognomies.

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