Boa Vista, Brazil

State University of Roraima
Boa Vista, Brazil
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Rizzatti I.M.,State University of Roraima | Marangon C.,State University of Roraima | Schveitzrt B.,Laboratorio Of Ensaio Quimico Estacao Experimental Of Cacador
Periodico Tche Quimica | Year: 2017

The objective of this article was to determine the macro and micronutrients in four species peppers cultivated in Roraima: Capsicum chinense Jacq. (Fish-eye peppers true and false, Spur cock, Murici, Eye mutum, Murupi, smelling pepper, Roxinha, Chilli, Sapucaia, and others), Capsicum frutescens (pepper malagueta), Capsicum annuum (bell peppers) e Capsicum baccatum v. pendulem Wild (Lady's finger and basking Hat), they were collected in two fairs of Boa Vista and the Lower Rio Branco region, county of Caracarai. Peppers are widely consumed in the state, however, there are no studies on the mineral composition. Were determined P (phosphorus) and B (boron) Spectrometry Ultraviolet Visible, the Ca (Calcium), K (potassium), Mg (magnesium), Fe (iron), Mn (manganese), Cu (copper) and Zn (zinc) by Atomic Absorption Spectrometry and N (nitrogen) Kjeldahl. In two peppers of the same species (C. chinense) were found high concentrations of Mn (pepper Murici) and Mg (pepper Roxinha) when compared to the other analyzed peppers. © 2017. Porto Alegre, RS. Brasil.

Gama Neto J.D.L.,State University of Roraima | Passos M.A.B.,Centro Estadual Of Educacao Profissional Prof Antonio Of Lima Pinho Ceep
Zootaxa | Year: 2017

A new species of Campylocia is described from Northern Brazil based on male and female imagoes. The main character-istics that distinguish the male imago of the new species from its congeners are: forewings with fork of Rs basal to fork of MA and one or two intercalary veins attached to CuA; general color of abdomen whitish; terga I-VIII with purplish brown dorsolateral area and light colored medial line; terga II-VII with two pairs of light colored drop-shaped spots (one medioapical and one medial); tergum VIII with a medioapical pair of light colored drop-shaped spots; terga IX-X orange; base of penis rectangular; penis lobes adjacent to medial line, laterally directed, without median lobes, fused on basal 1/2 and slender on distal 2/3; subgenital plate rectangular with medial emargination and dark brown margins. © Copyright 2017 Magnolia Press.

Luz F.J.F.,EMBRAPA - Empresa Brasileira de Pesquisa Agropecuária | de Oliveira J.M.F.,EMBRAPA - Empresa Brasileira de Pesquisa Agropecuária | da Silva G.F.N.,State University of Roraima
Ornamental Horticulture | Year: 2016

Orchids were observed in a granitic mountain hill at the, Caroebe road 35, Roraima, at February and June of 2016. It was observed the occurrence of orchids in three different points: the base of the mountain, with typical humid tropical dry land forest; the forest around the rocky top of the mountain, with the presence of thin trees about 15 meters high, medium light entrance below the vegetation; and the granitic plateau, more sun incidence and surrounded by small shrubs. The total area surveyed was of 5 hectares. The orchids encountered in the whole trail were prior identified locally, just as their localization by GPS and according to their growth habit (epiphytic, terrestrial or rupicolous). It was found 28 species. The majority of the individuals identified in this survey were found on organic layers accumulated over the granitic rock, as follow: Catasetum planiceps, Catasetum discolor, Cyrtopodium andersonii, Encyclia granitica, Epidendrum ibaguense, Epidendrum viviparum, Cleistes rosea e Nohawilliamsia pirarensis. At the forest that surrounds the rocky hill it was observed, associated to small trees, the following epiphyte orchids: Dimerandra emarginata, Octomeria sp., Scaphyglottis sickii, Trigonidium acuminatum and Cattleya violacea. At the forest covering the base of the mountain it was found the larger number of species (13), with predominance of epiphytes. Besides the larger number found, the frequency of these species was very low, except for Camaridium ochroleucum and Heterotaxis superflua that were found in larger quantity associated to some sort of trees. The specie Liparis nervosa was found only associated to the base of a unique tree, over the organic matter accumulated locally. The large number of orchids found in the study area indicates its importance for more comprehensive studies and stresses the importance for conservation.

Toledo J.J.,National Institute of Amazonian Research | Toledo J.J.,State University of Roraima | Magnusson W.E.,National Institute of Amazonian Research | Castilho C.V.,EMBRAPA - Empresa Brasileira de Pesquisa Agropecuária
Journal of Vegetation Science | Year: 2013

Questions: What processes shape the size-density distribution of tropical trees? Are these processes affected by topographic position? Location: Reserva Ducke, Central Amazonia, Manaus, Brazil. Methods: We identified tree mode of death in a 5-yr census interval (2003-2008) in 72 1-ha permanent plots distributed over 64 km2, and calculated the proportion of standing and fallen modes of deaths across size classes and by topographic position. Lowess regression was used to identify the dominance of standing or fallen modes across tree sizes. We used this information to separate the size-density distribution of trees into two parts hypothetically shaped by different processes. We fitted several models and tested the metabolic theory's prediction that size-density distribution scales with stem diameter to the -2 power. Results: Most dead trees <22 cm DBH and ≥48 cm DBH died standing, while trees between 22 and 48 cm DBH uprooted or snapped. Mode of death varied among topographic positions. On plateaux, standing death predominated across all tree size classes, while on slopes standing death dominated for small trees (<14 cm DBH), while fallen deaths dominated for intermediate to large trees (14 ≤ DBH <46 cm). In valleys, fallen modes of death dominated across all size classes. Scaling and negative exponential functions with a quadratic term fitted better the size-density distribution of all trees. The scaling function fitted better the distribution of small to intermediate-sized trees while the negative exponential function and functions with a quadratic term showed the best fit to distribution of intermediate to large trees. Conclusions: Competition is the major source of mortality for small- to intermediate-sized trees, while exogenous disturbances and senescence predominate for intermediate to large trees. Modes of death, and presumed sources of mortality, change according to topographic position, but the shape of size-density distributions is not affected, demonstrating that unknown mechanisms with different processes not assumed in the metabolic theory can produce similar distributions for tropical trees. Understanding the mechanisms that determine tropical forest structure will allow us to predict forest dynamics under future climate change scenarios. © 2012 International Association for Vegetation Science.

Barbosa R.I.,National Institute of Amazonian Research | Mourao Jr. M.,Brazilian Enterprise for Agricultural and Ranching Research | Casadio G.M.L.,Roraima State Foundation for Environment and Water Resources | Da Silva S.J.R.,State University of Roraima
Ecotropica | Year: 2012

The reproductive phenological patterns were investigated in the three most abundant tree species in the Roraima open savanna: Curatelk americana L.f. (Dilleniaceae), Byrsonima crassifolia (L.) Kunth, and B. coccolobifolia Kunth (Malpighiaceae). A total of 112 trees were marked for study over a period of 24 months (2001-2003), and the existence of climatic synchrony and duration of phenological phases that characterize the reproductive patterns of each population were investigated. The results indicate (i) in C. americana and B. crassijblia reproductive phenological events were strongly associated with low amounts of rainfall, but climatic synchrony was not clearly pronounced in B. coccolobifolia, (ii) each species demonstrated its own distinct phenophase duration and population synchrony, and (iii) the phenological pattern for the three species can be defined as intermediate (between the beginning and end of the dry season), with all species using zoochory as the principal means of seed dispersal. We conclude that for all three species, the majority of phenological events occur during the dry season peak, which corresponds to the lowest amount of cloud cover and the highest amount of insolation across most of the savanna in Roraima. The phenological patterns and the reproductive cycles of the three species studied are similar to those observed in other savanna regions of Brazilian Amazonia and Venezuela. © Society for Tropical Ecology.

Gondim Jr. M.G.C.,University of Pernambuco | Castro T.M.M.G.,State University of Roraima | Marsaro Jr. A.L.,Laboratorio Of Entomologia | Navia D.,Laboratorio Of Quarentena Vegetal | And 3 more authors.
Systematics and Biodiversity | Year: 2012

The red palm mite Raoiella indica Hirst (Tenuipalpidae) was first reported in the New World in 2004, dispersing quickly and widely while adopting new plant species as hosts. Since then, it has caused severe damage in this region, especially to coconut (Cocos nucifera L.). It was first found in Brazil in 2009, in the northern Amazonian state of Roraima. In the present study, native and introduced plants were sampled between March 2010 and February 2011 in sites of the 15 Roraima municipalities, to estimate its distribution and the associated mite fauna. In addition, monthly samples were taken from a coconut plantation in Mucajaí throughout the same period, for an initial appraisal of the levels R. indica could reach. It was found in 10 municipalities, on 19 plant species of four families. Six species are reported for the first time as hosts. Among the associated predators, 89.1% were Phytoseiidae, most commonly Amblyseius largoensis (Muma), Iphiseiodes zuluagai Denmark & Muma and Euseius concordis (Chant). The highest densities of R. indica, 1.5 and 0.35 mites/cm2 of leaflet (approx total of 331 and 77 mites/leaflet), were reached respectively in March 2010 and February 2011. The highest density of phytoseiids on coconut (0.009 mites/cm2 or about 2 mites/leaflet) was reached in November 2010. The average densities of R. indica recorded for Roraima were comparable to those reported for countries in which the mite is reportedly economically damaging. The dispersal of R. indica through the Amazon forest may result in damage to cultivated and native palms, and plants of other families, if the projected increase in both the frequency and the severity of drought events occurs. Parts of the Amazon have undergone periods of low rainfall, a condition that appears to favour the biology of this mite. Its eventual arrival to northeastern Brazil may result in heavy economic and ecological losses. © 2012 The Natural History Museum.

De Moraes G.J.,University of Sao Paulo | De Castro T.M.M.G.,State University of Roraima | Kreiter S.,Montpellier SupAgro | Quilici S.,University of Reunion Island | And 2 more authors.
Acarologia | Year: 2012

Since it first appeared in the New World in 2004, the palm red mite, Raoiella indica Hirst, has spread to many countries, from Florida (USA) to the northern part of Brazil. In this region, this mite has been recorded on several different hosts, but it has been most harmful to coconut. For different reasons, the chemical control of this pest is not feasible, and biological control has been considered an important measure to be pursued. The objective of this paper is to provide details about an effort to determine potential natural enemies of R. indica from La Réunion, for their possible introduction in northern Brazil. The only natural enemy consistently found in association with R. indica was identified as the phytoseiid Amblyseius largoensis Muma. A colony of this species was established with specimens collected from different parts of the island. This colony was introduced to Brazil, where subsequent assessments should indicate whether or not it should be released in the field. © Moraes G.J. de et al.

Marques-de-Souza J.,State University of Roraima | Iannuzzi R.,Federal University of Rio Grande do Sul
Review of Palaeobotany and Palynology | Year: 2016

New occurrences of Ottokaria fructifications are documented from the Cisuralian of the Paraná Basin, in the states of Santa Catarina and Rio Grande do Sul, Brazil. New occurrences of Ottokaria sanctae-catharinae Dolianiti are reported from the outcrops of the Morro do Papaléo/Faxinal Section (uppermost Itararé Group) and the Rio da Estiva (Paraguaçu Member, Rio Bonito Formation). Specimens designated as Ottokaria minor nov. sp. were recovered from the Itanema II outcrop (Rio Bonito Formation, Siderópolis Member). © 2016 Elsevier B.V.

Neves L.C.,State University of Roraima | Tosin J.M.,State University of Roraima | Benedette R.M.,State University of Roraima | Cisneros-Zevallos L.,Texas A&M University
Food Chemistry | Year: 2015

The post-harvest nutraceutical characteristics of highly perishable native fruits species from the Northern Brazilian Amazon region were studied during 12 day at 15 ± 1 °C and 95 ± 3% RH. Uxi and caja fruit showed climacteric behaviour while caju, açai de terra firme, camu-camu, inajá, murici and araçá-boi were non-climacteric. Soluble solids and sugars increased for climacteric fruit while total acidity remained constant for all fruits. In general, all fruit species had high levels of total phenolics (121-9889 mg GAE 100 g-1 dry weight pulp), vitamin C (31-1532 mg AA 100 mL-1 juice) and antioxidant activity (AOX) (75-2881 μmol Trolox Eq 100 g-1 dry weight, ORAC value), however, camu-camu, acai and murici were among the highest. All fruits showed an increase in phenolic content (15-82%), a simultaneous decrease in ascorbic acid in both peel (88-98%) and pulp (89-97%), while AOX increased or decreased depending on the fruit species, very likely due to the specific phenolic profile being synthesized. We propose a hypothetical model where ripening/senescence induced a redox homeostasis imbalance which in turn triggered the responses. © 2014 Elsevier Ltd. All rights reserved.

De Liege Gama Neto J.,State University of Roraima | Passos M.A.B.,State University of Roraima
Zootaxa | Year: 2016

Two new species of Ulmeritoides Traver, 1959 from Northern Brazil are described based on male imagos. Ulmeritoides aurantifrons sp. nov. differs from all other species of the genus by the following combination of characters: mesonotum with a yellow spot in the apical and medial portions of the mesoscutal suture and a yellowish spot between the apex of the medioscutum and the posterior scutal protuberances, scutellum dark brown with base and apex yellow; forewing hyaline with two cross veins basal to bulla; penis lobes with a ventral groove, apically rounded. Ulmeritoides mirr sp. nov. differs from all other species of the genus by the following combination of characters: mesonotum with mesoscutal suture yellow; apex of the posterior scutal protuberance with a yellow transversal line; forewing hyaline, costal and subcostal areas tinged with light brown; penis lobes with a ventral groove, apically rounded. Copyright © 2016 Magnolia Press.

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