Consulta: creatorFacets:"Fernandes,G. Wilson"
Registros recuperados: 28
Data/hora: 09/06/2024 04:52:52

Foraging patterns of the leaf-cutter ant Atta laevigata (Smith) (Myrmicinae: Attini) in an area of cerrado vegetation
Provedor de dados: 82
Autores: Viana,Leonardo R.; Santos,Jean C.; Arruda,Leandro J.; Santos,Glenio P.; Fernandes,G. Wilson.
Foraging rate can directly affect the impact that Atta laevigata (Smith) has on the environment. We attempted to assess the factors which most affect foraging rate of A. laevigata using data collected over a three month period in the Parque Nacional da Serra do Cipó in Minas Gerais, Brazil. A bimodal foraging pattern was observed on clear sunny days, based on collected dry weights of vegetative material being carried towards nest entrances. Sampled entrances on clear sunny days yielded a daily average dry weight twice as high (0.9713 ± 0.1358 g) as on rainy days (0.4485 ± 0.1120 g). Larger nests (0.9713 ± 0.1358 g) yielded higher dry weights than smaller nests (0.2752 ± 0.0463 g). Field observations showed Ants switched to nest entrances with more suitable...
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Foraging constraints; Herbivory; Hotspot; Microhabitat specialization; Serra do Cipó.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2004000300019

Anatomical and developmental aspects of leaf galls induced by Schizomyia macrocapillata Maia (Diptera: Cecidomyiidae) on Bauhinia brevipes Vogel (Fabaceae)
Provedor de dados: 88
Autores: Sá,Camila Emiliane Mendes de; Silveira,Fernando A. O.; Santos,Jean C.; Isaias,Rosy Mary dos Santos; Fernandes,G. Wilson.
Samples of healthy leaves and galls induced by Schizomyia macrocapillata Maia on Bauhinia brevipes Vogel were submitted to routine techniques to investigate gall anatomy and development. Pouch galls are induced on the abaxial surface of unfolded immature leaves, and become spheroid with long reddish hairs covering their external surface. Galls occur isolated or coalesce when in larger numbers. Gall development was divided into six phases: 1) initiation; 2) tissue re-arrangement; 3) tissue differentiation; 4) maturation; 5) growth phase; and 6) dehiscence. This last phase corresponds to gall senescence, which takes place just after the larva exits the chamber to pupate. An important developmental phase of tissue reorientation was recorded after the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ambrosia gall; Gall anatomy; Gall midge; Mycetophagy; Ontogenesis.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042009000200011

Ovipositing behaviour of Compsobracon mirabilis (Szépligeti) (Hymenoptera, Braconidae) in a cerrado habitat, southeastern Brazil
Provedor de dados: 92
Autores: Santos,Jean C.; Viana,Leonardo R.; Silveira,Fernando A. O.; Penteado-Dias,Angélica M.; Fernandes,G. Wilson.
The oviposition behaviour of the braconid parasitoid, Compsobracon mirabilis ( Szépligeti, 1901) is described. Observations were conducted in a cerrado region located in Três Marias, Minas Gerais, Brazil. The oviposition occurred in a branch of Alibertia concolor (Cham.) K. Schum. 1889 (Rubiaceae), inside of which there were thirteen larvae of an unidentified species of Lepidoptera.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Alibertia concolor; Braconidae; Hymenoptera; Oviposition behaviour; Parasitism.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0085-56262004000100024

A new species of Bruggmanniella (Diptera, Cecidomyiidae, Asphondyliini) associated with Doliocarpus dentatus (Dilleniaceae) in Brazil
Provedor de dados: 92
Autores: Maia,Valéria Cid; Fernandes,G. Wilson; Oliveira,Lázaro A.
Bruggmanniella doliocarpi, a new galling species associated with Doliocarpus dentatus (Dilleniaceae) is described and illustrated (male, female, pupa, larva and gall) based on material from Minas Gerais, Brazil. The new species is compared to the other known Neotropical species. This is the first report of Bruggmanniella for Minas Gerais and in association with Dilleniaceae.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brazilian savanna; Gall midge; Neotropical; Taxonomy.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0085-56262010000200004

Ants and their effects on an insect herbivore community associated with the inflorescences of Byrsonima crassifolia (Linnaeus) H.B.K. (Malpighiaceae)
Provedor de dados: 92
Autores: Fernandes,G. Wilson; Fagundes,Marcílio; Greco,Magda K. Barcelos; Barbeitos,Marcos Soares; Santos,Jean Carlos.
The effects of ants on the insect community on inflorescences of Byrsonima crassifolia (Malpighiaceae) were tested in an ant exclusion experiment in a cerrado vegetation in southeastern Brazil. Forty-four species of insects (23 families) and nine species of ants (6 genera and 3 subfamilies) were found on the inflorescences of B. crassifolia. The exclusion of ants, primarily Camponotus sericeiventris and Camponotus spp., reduced the treehopper population to 20% of the original abundance. Ant exclusion and time influenced the abundance of chewing (Exclusion, P&lt;0.001; Time, P&lt;0.002), and sucking insects (Exclusion, P&lt;0.02; Time, P&lt;0.01). Twice as many chewing and sucking insects were found on ant-excluded inflorescences as compared to control...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ant-treehopper mutualism; Cerrado; Community structure; Insect herbivory.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0085-56262005000200011

Impact of a gall midge Parkiamyia paraensis (Diptera, Cecidomyiidae) on the Amazonian plant Parkia pendula (Fabaceae)
Provedor de dados: 92
Autores: Fernandes,G. Wilson; Santos,Jean Carlos; Castro,Fabiana Marize C.; Castilho,Alexandre.
We observed the occurrence of large numbers of galls induced by Parkiamyia paraensis (Diptera, Cecidomyiidae) on the leaflets of Parkia pendula (Fabaceae) in northern Para, Brazil. We addressed two questions in this study: i) what is the proportion of attacked plants in the field, and nursery conditions?; and ii) what is the impact of galls on the host plant? An average of 86% of the plants were galled in the field. Galled P. pendula were distinct from healthy individuals due to their prostrated architecture and death of terminal shoots. Approximately 50% of the total available leaves and 35% leaflets were attacked by P. paraensis on saplings under nursery conditions. Each one-year old plant supported an average of 1,300 galls, and an average of 60g...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amazon; Herbivore impact; Insect galls; Porto Trombetas.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0085-56262007000400011

Efeitos do sexo, do vigor e do tamanho da planta hospedeira sobre a distribuição de insetos indutores de galhas em Baccharis pseudomyriocephala Teodoro (Asteraceae)
Provedor de dados: 92
Autores: Araújo,Ana Paula A.; Carneiro,Marco Antonio A.; Fernandes,G. Wilson.
Several hypotheses have been proposed to explain the patterns of host plant utilization by herbivorous insects in natural communities. We tested four hypotheses aiming to understand the pattern of attack by gall-inducing insects on the dioecious shrub, Baccharis pseudomyriocephala (Asteraceae). The shrub occurs in the Parque Estadual do Itacolomi, Southeastern Brazil, and supports ten species of galling insects. The following hypotheses were tested: i) male plants are more attacked by galling insects than female plants; ii) larger plant modules are preferentially attacked by galling insects; iii) galling insects perform better on larger modules than on smaller modules; iv) galling insects increase in abundance with meristematic availability. To address...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dioecy; Galling insects; Insect herbivore; Plant architecture; Plant vigour hypothesis.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0085-56262003000400001

Insetos galhadores associados a duas espécies de plantas invasoras de áreas urbanas e peri-urbanas
Provedor de dados: 92
Autores: Julião,Genimar R.; Fernandes,G. Wilson; Negreiros,Daniel; Bedê,Lúcio; Araújo,Raquel C.
Os insetos têm sido considerados importantes indicadores de mudanças ambientais e da qualidade de habitats. Apesar de seu hábito séssil, fácil visualização, abundância, e especificidade de hospedeiro, insetos indutores de galhas não têm sido utilizados em estudos desta natureza. Neste estudo foi investigado o uso potencial de insetos galhadores associados a duas espécies de plantas hospedeiras ruderais (Baccharis dracunculifolia e Vernonia polyanthes: Asteraceae) como bioindicadores da qualidade de habitats. Procurou-se responder às seguintes questões: (i) A diversidade de insetos galhadores é afetada pelo tipo de uso e ocupação da paisagem (solo)?; (ii) A resposta das comunidades de insetos galhadores difere entre as duas espécies de plantas hospedeiras?;...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bioindicadores; Biótopos; Gradiente rural-urbano; Plantas hospedeiras.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0085-56262005000100010

Gall inducing arthropods from a seasonally dry tropical forest in Serra do Cipó, Brazil
Provedor de dados: 92
Autores: Coelho,Marcel Serra; Almada,Emmanuel D.; Fernandes,G. Wilson; Carneiro,Marco Antonio A.; Santos,Rubens M. dos; Quintino,André V.; Sanchez-Azofeifa,Arturo.
Highly diverse forms of galling arthropods can be identified in much of southeastern Brazil's vegetation. Three fragments of a Seasonally Dry Tropical Forest (SDTF) located in the southern range of the Espinhaço Mountains were selected for study in the first survey of galling organisms in such tropical vegetation. Investigators found 92 distinct gall morphotypes on several organs of 51 host plant species of 19 families. Cecidomyiidae (Diptera) was the most prolific gall-inducing species, responsible for the largest proportion of galls (77%) observed. Leaves were the most frequently galled plant organ (63%), while the most common gall morphotype was of a spherical shape (30%). The two plant species, Baccharis dracunculifolia (Asteraceae) and Celtis...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biodviersity; Biogeography; Host plant family; Herbivory; Insect galls; Richness.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0085-56262009000300015

A new genus and species of gall midge (Diptera, Cecidomyiidae) associated with Myrcia retorta (Myrtaceae)
Provedor de dados: 92
Autores: Maia,Valéria Cid; Fernandes,G. Wilson; Negreiros,Daniel.
Brethesia Maia, new genus and Brethesia myrciae Maia, new species of Cecidomyiidae are described and illustrated (male, female, pupa and gall) based on material collected in Minas Gerais (Brazil). This new species induces leaf galls on Myrcia retorta (Myrtaceae).
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Asphondyliini; Brazil; Insect galls; Schizomyiina; Taxonomy.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0085-56262009000100010

Within tree distribution of a gall-inducing Eurytoma (Hymenoptera, Eurytomidae) on Caryocar brasiliense (Caryocaraceae)
Provedor de dados: 92
Autores: Leite,Germano Leão Demolin; Veloso,Ronnie Von dos Santos; Silva,Farley Willian Souza; Guanabens,Rafael Eugênio Maia; Fernandes,G. Wilson.
For the first time, we identified the insect herbivore that induces one of the most conspicuous galls on the leaves of Caryocar brasiliense Camb. (Caryocaraceae), a widespread, typical cerrado woody plant of large economic importance. The gall inducing organism is a new and undescribed species of Eurytoma sp. (Hymenoptera, Eurytomidae). Furthermore, we recorded its spatial distribution within C. brasiliense trees. More Eurytoma galls were found on the eastern tree slope, followed the southern and northern slopes. More galls were found in the interior of the tree crown, i.e., on the proximal portion of the stems compared to the terminal portion. At the leaf level, more galls were found on the median region compared to the distal or proximal, perhaps due to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cerrado; Insect distribution; Insect galls; Pequi; Trichomes.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0085-56262009000400015

A 15-year post evaluation of the fire effects on ant community in an area of Amazonian forest
Provedor de dados: 92
Autores: Santos,Jean C.; Delabie,Jacques H. C.; Fernandes,G. Wilson.
Fire represents an important disturbance to ant communities in areas of fire regime. Otherwise, little is known about the effects of fire on ant communities in areas of non-fire regimes, such as in the Amazonian region. We evaluated the long-term effect of fire on ant species richness in a rain forest (Bacaba Plateau) burned 15-years ago and compare our data with the data of primary unburned forest. A total of 85 ant species distributed in 21 genera and 14 tribes were collected; among them, 72 and 44 species were found on the litter and vegetation, respectively. The fire damaged forest studied supports an intermediate richness of ants when compared to a primary unburned rain forest in the same region. A comparative analysis of ant species richness showed...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amazon; Brazil; Community structure; Rain forest; Species richness.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0085-56262008000100015

Pattern of attack of a galling insect reveals an unexpected preference-performance linkage on medium-sized resources
Provedor de dados: 92
Autores: Santos,Jean C.; Silveira,Fernando A. O.; Pereira,Ellen C.; Fernandes,G. Wilson.
Pattern of attack of a galling insect reveals an unexpected preference-performance linkage on medium-sized resources. The Plant Vigor Hypothesis (PVH) predicts oviposition preference and higher offspring performance on longer and fast-growing shoots, and although several studies have tested its predictions, long-term studies concerning the patterns of host selection by galling species are still lacking. The PVH was tested in this study using Bauhinia brevipes (Fabaceae) as the host of a leaf gall midge, Asphondylia microcapillata (Diptera, Cecidomyiidae) during three consecutive years. Shoots were collected from the same 80 plants between 2001 and 2003 and shoot length, number of healthy and galled leaves, gall number, and mortality factors were recorded....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Host selection; Insect galls; Mortality factors; Plant Vigor Hypothesis; Top-down effect.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0085-56262010000100012

Spatial distribution of a spherical gall (Hymenoptera, Eulophidae) on Caryocar brasiliense (Caryocaraceae)
Provedor de dados: 92
Autores: Leite,Germano Leão Demolin; D'Ávila,Vinicius de Abreu; Cerqueira,Vinicius Matheus; Nascimento,Aline Fonseca do; Fernandes,G. Wilson.
We obtained the first data on spatial distribution of a spherical galling insect (Hymenoptera, Eulophidae) at the Caryocar brasiliense Camb. (Caryocaraceae) tree level. This work was developed in two pastures in Montes Claros, Minas Gerais State, Brazil. The areas studied were: pasture 1 (in activity) and pasture 2 (abandoned pasture = savanna in recovery). We evaluated the distribution of spherical galls in: foliage orientation (slope), among leaves (border and interior of the tree crown), among leaflets (right, central, left), distal, median, and proximal as well as border, central area, and adjacent to the mid leaf vein of the leaflet, and difference between areas in 10 infested trees per area. The smaller number of spherical gall/leaflet was observed...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cerrado; Galling insects; Insect distribution; Pequi.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0085-56262011000300013

Insetos indutores de galhas da porção sul da Cadeia do Espinhaço, Minas Gerais, Brasil
Provedor de dados: 92
Autores: Carneiro,Marco Antonio A.; Borges,Rafael A. X.; Araújo,Ana P. A.; Fernandes,G. Wilson.
A riqueza de insetos galhadores é maior nas latitudes intermediárias em hábitats quentes e com vegetação esclerófila sob estresse hídrico e de nutrientes. Em regiões tropicais, os campos rupestres são indicados como hábitats ricos em espécies de insetos galhadores. Neste trabalho, foram descritas as galhas induzidas por insetos e suas plantas hospedeiras na porção sul da Cadeia do Espinhaço, sudeste do Brasil. Foram selecionados 60 sítios em seis regiões ao longo na porção sul da Cadeia do Espinhaço no estado de Minas Gerais. Em cada sítio 100 plantas foram amostradas totalizando 6.000 plantas censuradas ao longo de um gradiente altitudinal de 668 a 1860m. Foram encontrados 241 morfotipos de galhas em 142 espécies de plantas distribuídas em 29 famílias e...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biodiversidade; Campos rupestres; Cerrado; Família de plantas hospedeiras; Montanhas.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0085-56262009000400007

Asphondylia fructicola, a new species of Cecidomyiidae (Diptera) associated with Solanum sp. (Solanaceae) from Brazil
Provedor de dados: 92
Autores: Maia,Valéria Cid; Santos,Jean Carlos; Fernandes,G. Wilson.
Asphondylia fructicola sp. nov. is described and illustrated on the basis of the larva, pupa, male, female, and gall. This species induces galls on fruits of Solanum sp. (Solanaceae) in Amazonia, Brazil.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Asphondylia; Insect galls; Taxonomy.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0085-56262009000200002

Ethical abuses in the authorship of scientific papers
Provedor de dados: 92
Autores: Carneiro,Marco Antonio A.; Cangussú,Silvia D.; Fernandes,G. Wilson.
Problems regarding the order of authorship of scientific papers have become more frequent and more abusive. These problems may have heightened due to the ever increasing pressure to "publish or perish" in the academic world, given that the publication of scientific articles has become the benchmark of success in a field with few job opportunities. This article reviews the abuses in the authorship of scientific papers. Different examples are given of the most common problems and recommendations are provided for authors and journal editors.
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Authorship; Co-authorship; Publishing; Science; Writing papers.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0085-56262007000100001

Relationships between host plant architecture and gall abundance and survival
Provedor de dados: 92
Autores: Lara,Daniela P.; Oliveira,Lázaro A.; Azevedo,Islaine F. P.; Xavier,Márcia F.; Silveira,Fernando A. O.; Carneiro,Marco Antonio Alves; Fernandes,G. Wilson.
The plant architecture hypothesis predicts that variation in host plant architecture influences insect herbivore community structure, dynamics and performance. In this study we evaluated the effects of Macairea radula (Melastomataceae) architecture on the abundance of galls induced by a moth (Lepidoptera: Gelechiidae). Plant architecture and gall abundance were directly recorded on 58 arbitrarily chosen M. radula host plants in the rainy season of 2006 in an area of Cerrado vegetation, southeastern Brazil. Plant height, dry biomass, number of branches, number of shoots and leaf abundance were used as predicting variables of gall abundance and larval survival. Gall abundance correlated positively with host plant biomass and branch number. Otherwise, no...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cerrado; Insect galls; Plant size; Structural complexity.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0085-56262008000100014

Richness of gall-inducing insects in the tropical dry forest (caatinga) of Pernambuco
Provedor de dados: 92
Autores: Santos,Jean Carlos; Almeida-Cortez,Jarcilene Silva de; Fernandes,G. Wilson.
Diversity of gall-inducing insects in the tropical dry forest (caatinga) of Pernambuco. We report on the richness of galling insects in the vegetation of caatinga of Pernambuco state, Brazil. We recorded 64 different types of galls collected primarily from leaves and stems of 48 species of host plants belonging to 17 families and 31 genera. The most common gall morphological types were spheroid and discoid, glabrous, predominantly green and with one chamber. The main gall inducing taxon was the Cecidomyiidae (Diptera). The results of this study contribute to existing knowledge of galling insect and host-plant diversity in caatinga.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cecidomyiidae; Host plants; Insect galls; Insect herbivore; Species richness.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0085-56262011000100009

Two new species of Lopesia Rübsaamen (Diptera, Cecidomyiidae) associated with Mimosa hostilis (Mimosaceae) in Brazil
Provedor de dados: 92
Autores: Maia,Valéria Cid; Fernandes,G. Wilson; Magalhães,Henrique; Santos,Jean Carlos.
Two new species of Lopesia Rübsaamen (Diptera, Cecidomyiidae) associated with Mimosa hostilis (Mimosaceae) in Brazil Two new species of Lopesia Rübsaamen (Diptera, Cecidomyiidae, Lopesiini), L. mimosae Maia, sp. nov. and L. pernambucensis Maia, sp. nov., that induce galls on Mimosa hostilis Benth. (Mimosaceae) are described and illustrated based on material from "caatinga" in Pernambuco, Brazil.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Caatinga; Cecidomyiidae; Diptera; Lopesia; Mimosaceae.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0085-56262010000400007

Growing straight versus growing decumbent: soil quality and allometry in Syagrus glaucescens Becc. (Arecaceae), an endemic and threatened palm of the Espinhaço Mountains, Brazil
Provedor de dados: 39
Autores: Miola,Deise Tatiane Bueno; Fernandes,G. Wilson.
ABSTRACTSyagrus glaucescens is an endemic palm found in the rupestrian grasslands of the Espinhaço Mountains in southeastern Brazil. It is highly associated with quartzitic soils and exhibits strong intra-specific morphological variation in the different areas where it occurs. Allometric traits were used to verify whether there are any significant differences in the morphological traits between populations of this species located in two distinct areas. In the region of the Serra do Cipó individuals exhibit decumbent stems whereas on the Diamantina Plateau stems are straight and perpendicular to the ground. Soil quality was related to plant morphological traits to test the hypothesis that allometric variation is influenced by soil nutritional differences....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aluminum saturation; Diamantina; Phenotypic variability; Rupestrian grasslands; Serra do Cipó; Soil-plant relationships.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062015000300417

Effects of sex and altitude on nutrient, and carbon and nitrogen stable isotope composition of the endangered shrub Baccharis concinna G.M. Barroso (Asteraceae)
Provedor de dados: 39
Autores: Fernandes,G. Wilson; Duarte,Heitor Monteiro; Silveira,Fernando A. O.; Broetto,Fernando; Lüttge,Ulrich; Rennenberg,Heinz.
ABSTRACT Previous ecological studies of dioecious plant species have found that female plants preferentially occur at lower altitudes where there are typically better nutritional conditions, while male plants often occur in less favorable sites. We compared the ecophysiological performance of male and female plants in three populations of the dioecious Baccharis concinna, an endemic species of rupestrian grasslands of Serra do Cipó, in southeastern Brazil. We hypothesized that physiological differences between the sexes would explain the distribution patterns of the populations. Analyses of the tissue content of phosphorus (P), calcium (Ca), potassium (K) and sodium (Na), and carbon and nitrogen stable isotopes, were used to assess nutritional status and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cerrado; Campos rupestres; Dioecy; Plant sex; Resource allocation; Rupestrian grasslands; Serra do Cipó.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062017000200229

A relict species restricted to a quartzitic mountain in tropical America: an example of microrefugium?
Provedor de dados: 39
Autores: Barbosa,Newton Pimentel de Ulhôa; Fernandes,G. Wilson; Sanchez-Azofeifa,Arturo.
ABSTRACTWe examined the distribution of Coccoloba cereifera,a tropical endemic species that occurs in a small area in the Espinhaço mountain range, southeastern Brazil. It is hypothesized that its narrow distribution is strongly related to the spatially scattered distribution of sandfields. However, this soil type extends far beyond the small region where C. cereifera is currently found, indicating that other factors might be involved in the distribution of this species. Coccoloba cereifera also displays all traits of a relict population in a microrefugium. As a result, we were encouraged to explore other factors potentially related to the distribution of the species. In an attempt to aid in the understanding of the processes and mechanisms that lead C....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Coccoloba cereifera; Espinhaço Mountains; Maximum entropy; Rupestrian grasslands; Serra do Cipó.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062015000300299

Tannins in Baccharis dracunculifolia (Asteraceae): effects of seasonality, water availability and plant sex
Provedor de dados: 39
Autores: Espírito-Santo,Mário M; Fernandes,G. Wilson; Allain,Luciana R; Reis,Ticiana R. F.
Several ecological, genetic, and environmental factors are known to influence tannin concentration in plant tissues. In this study, the effects of seasonality, water availability, and sex of the plant on tannin concentration in the dioecious shrub Baccharis dracunculifolia were assessed. The effects of water availability on plant shoot growth and its relationship to tannin concentration were also experimentally evaluated. Tannins occurred in B. dracunculifolia from November to May, peaking during the summer (December to March). However, no relationship between tannin concentration, rainfall and temperature was found. No difference in tannin concentration and shoot growth was found between plants in the irrigated and control treatments, this suggesting that...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Tannins; Baccharis dracunculifolia; Irrigation; Gender; Phenology.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33061999000200006

Ecophysiological performance of a threatened shrub under restored and natural conditions in a harsh tropical mountaintop environment
Provedor de dados: 39
Autores: Castro,Silvana A. B.; Sá,Camila E. M.; Mourão,Fabiana A.; Duarte,Heitor M.; Fernandes,G. Wilson; Lemos-Filho,José P.
Ecophysiological responses of plants are useful for monitoring the success of ecological restoration projects that target species conservation. In this study we evaluated the ecophysiological traits of individuals of Chamaecrista semaphora from a natural population and from a site under restoration. Water potential and chlorophyll a fluorescence parameters were measured both in adult and young plants of the two populations. No difference in water potential was found between sites, but individuals in the restored site had higher water potential at predawn. Adults in the natural site presented lower daily values of potential quantum yield, indicating the occurrence of photoinhibition. Individuals in the restored site also presented higher maximum relative...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chlorophyll fluorescence; Ecological restoration; Endangered species; Plant performance; Rupestrian grasslands.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062016000100017

Influência da luz e da temperatura na germinação de sementes de Marcetia taxifolia (A. St.-Hil.) DC. (Melastomataceae)
Provedor de dados: 39
Autores: Silveira,Fernando A.O.; Negreiros,Daniel; Fernandes,G. Wilson.
Marcetia taxifolia (A. St.-Hil.) DC. (Melastomataceae) é um arbusto amplamente distribuído nos campos rupestres da Serra do Cipó, Brasil. É uma espécie com potencial na recuperação de áreas degradadas e este estudo apresenta os primeiros dados sobre o efeito da luz e da temperatura na germinação de suas sementes. Sementes foram coletadas em maio/2001 e foram submetidas a testes de germinação nas temperaturas constantes de 15, 20, 25, 30 e 35ºC sob fotoperíodo de 12 horas e em ausência de luz durante 30 dias. Foram encontradas diferenças significativas entre a percentagem de germinação e tempo médio de sementes submetidas ao tratamento claro e escuro a 15, 20, 25 e 30ºC (p &lt; 0,05; todos). Sob a temperatura de 35ºC, a germinação foi completamente inibida....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Campo rupestre; Fotoblastismo; Germinação de sementes; Serra do Cipó.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062004000400015

Hemiparasitism effect on Baccharis dracunculifolia DC. and consequences to its major galling herbivore
Provedor de dados: 39
Autores: Bahia,Thaise de Oliveira; Zúñiga,Irene Gélvez; Souza,Matheus Lopes; Coutinho,Etiene Silva; Quesada,Mauricio; Fernandes,G. Wilson.
ABSTRACTMistletoes obtain nutrients and water from their hosts, with varying effects among those hosts. We assessed the factors that influence the colonization of the mistletoe Struthanthus flexicaulis on Baccharis dracunculifolia and the subsequent effects on host performance. We evaluated the incidence of S. flexicaulis according to size (height classes) and architecture of the host as well as its effects on various physiological parameters of the host. Furthermore, we assessed the occurrence of insect galls induced by Baccharopelma dracunculifoliae(Psyllidae), including the number of leaves infected, and the mortality of infected and non-infected branches. Taller hosts had a higher abundance of mistletoes (60%, p&gt; 0.05). Physiological parameters of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Baccharopelma dracunculifoliae; Insect galls mistletoe rupestrian grasslands; Struthanthus flexicaulis.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062015000300339

Distribution of the assemblage of phlebotomine sandflies (Diptera: Psychodidae) along an environmental gradient
Provedor de dados: 49
Autores: Antonini,Yasmine; Fernandes,G. Wilson; Barata,Ricardo Andrade.
Abstract The geographical distribution of leishmaniasis has undoubtedly expanded, and is now being reported to be in areas that were previously non-endemic. This study therefore aimed to investigate whether there is any variation in the structure and in the composition of phlebotomine communities along an environmental gradient - from a mesic to a xeric environment, across different climatic periods (rainy and dry seasons). Furthermore, we test whether there were differences in sex ratio of sand flies between wet and dry environments. A total of 535 specimens of sand flies belonging to 18 species were recorded. Richness, abundance, and composition of species were significatively higher in the xeric environment (semidecidual Forest) compared to the mesic...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Species composition; Ecology; Leishmaniasis; Atlantic Forest; Brazil.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032017000200202