Search Results - "Araujo, Helder F. P"

Human disturbance is the major driver of vegetation changes in the Caatinga dry forest region by Araujo, Helder F. P., Canassa, Nathália F., Machado, Célia C. C., Tabarelli, Marcelo

“…Drastic changes in vegetation structure caused by exceeding ecological thresholds have fueled the interest in tropical forest responses to climate and land-use…”
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The distribution and conservation of areas with microendemic species in a biodiversity hotspot: a multi-taxa approach by de Araujo, Helder F P, Machado, Célia C C, da Silva, José Maria Cardoso

“…Microendemic species are species with very small geographic distributions (ranges). Their presence delimitates areas with microendemic species (AMs), denoting…”
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Bird-keeping in the Caatinga, NE Brazil by Alves, Rômulo Romeu da Nóbrega, Nogueira, Emerina E. G, Araujo, Helder F. P, Brooks, Sharon E

“…Brazil has one of the greatest bird diversities in the world, with around 1,800 species. However, many species are now threatened by illegal capture and trade…”
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Seasonal variations in scorpion activities (Arachnida: Scorpiones) in an area of Caatinga vegetation in northeastern Brazil by Araújo, Cristiane S.(Universidade Federal do Rio Grande do Norte Departamento de Botânica, Ecologia e Zoologia Laboratório de Ecologia e Conservação da Biodiversidade), Candido, Denise M.(Instituto Butantan Laboratório de Artrópodes), Araújo, Helder F. P. de(Universidade Federal da Paraíba Departamento de Ciências Biológicas), Dias, Sidclay C.(Museu Paraense Emílio Goeldi Laboratório de Aracnologia), Vasconcellos, Alexandre(Universidade Federal do Rio Grande do Norte Departamento de Botânica, Ecologia e Zoologia Laboratório de Ecologia e Conservação da Biodiversidade)

“…Seasonal variations in scorpion activity were investigated during a 24 month period in an area of Caatinga (dryland) vegetation in the state of Paraíba,…”
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Ethnotaxonomy of mastofauna as practised by hunters of the municipality of Paulista, state of Paraíba-Brazil by Mourão, José S, Araujo, Helder F P, Almeida, Fabiana S

“…It was aimed in the present work to report aspects related to identification, naming and categorization of the mastofauna species of the caatinga biome,…”
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Temporal variations of body mass and plumage in Arenaria interpres (Aves: Scolopacidae) along the Brazilian coast by Rodrigues, Roberta C., Azevedo-Júnior, Severino M. de, Larrazábal, Maria E. L. de, Araujo, Helder F. P. de

“…Every year, Brazil receives large flocks of nearly 40 migratory shorebirds species. The accumulation of body fat and nutrients during the summer is necessary…”
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Climatic Variables Do Not Directly Predict Spider Richness and Abundance in Semiarid Caatinga Vegetation, Brazil by Carvalho, Leonardo S, Sebastian, Nicholas, Araújo, Helder F. P, Dias, Sidclay C, Venticinque, Eduardo, Brescovit, Antonio D, Vasconcellos, Alexandre

“…Spiders are abundant in tropical ecosystems and exert predatory pressure on a wide variety of invertebrate populations and also serve as prey for many others…”
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Vegetation productivity under climate change depends on landscape complexity in tropical drylands by de Araujo, Helder F. P., Machado, Célia C. C., Alves, Ana Carolina Flores, da Costa Lima, Mônica, da Silva, José Maria Cardoso

“…Models suggest that extreme drought events induced by climate change can reduce the vegetation productivity of drylands and negatively influence millions of…”
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First record of Aricoris campestris (Bates, 1868) Lepidoptera: Riodinidae in pitaya in northeastern Brazil by Araujo, Helder F. P. de, Brito, Carlos H. de, Kerpel, Solange M., Oliveira Filho, Manoel C. de

“…ABSTRACT Pitaya (Selenicereus spp.) is a tropical fruit tree belonging to the Cactaceae family, native to the tropical regions of Central and South America…”
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A sustainable agricultural landscape model for tropical drylands by Araujo, Helder F.P. de, Machado, Célia C.C., Pareyn, Frans G.C., Nascimento, Naysa F.F. do, Araújo, Lenyneves D.A., Borges, Laís A. de A.P., Santos, Bráulio A., Beirigo, Raphael M., Vasconcellos, Alexandre, Dias, Bruno de O., Alvarado, Fredy, Silva, José Maria Cardoso da

“…[Display omitted] •Landscapes in drylands need at least 50 % of the landscape protected or restored.•Water production declined when 35 % of the landscape is…”
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Seasonal activity of Dinoponera quadriceps Santschi (Formicidae, Ponerinae) in the semi-arid Caatinga of northeastern Brazil by Jeniffer Medeiros, Arrilton Araújo, Helder F. P. Araújo, João Paulo C. Queiroz, Alexandre Vasconcellos

“…Seasonal activity of Dinoponera quadriceps Santschi (Formicidae, Ponerinae) in the semi-arid Caatinga of northeastern Brazil. We studied seasonal foraging…”
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The Caatinga region is a system and not an aggregate by Araujo, Helder F.P. de, Garda, Adrian Antonio, Girão e Silva, Weber Andrade de, Nascimento, Nayla Fábia Ferreira do, Mariano, Erich de Freitas, Silva, José Maria Cardoso da

“…The Caatinga region, one of the world's most biodiverse tropical drylands, has been recently portrayed as an aggregate of closed biotas that do not interact…”
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Landscape attributes shape dung beetle diversity at multiple spatial scales in agricultural drylands by Estupiñan-Mojica, Anderson, Portela-Salomão, Renato, Liberal, Carolina N., Santos, Bráulio A., Machado, Célia C.C., de Araujo, Helder F.P., Von Thaden, Juan, Alvarado, Fredy

“…Land-use change is one of the main drivers of biodiversity loss worldwide, but its negative effects can vary depending on the spatial scale analyzed…”
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Genotype x environment interaction and stability in landraces of cowpea under dryland conditions by Rolim, Rubens R., do Nascimento, Naysa F. F., Nascimento, Mayana F., de Araujo, Helder F. P.

“…ABSTRACT Cowpea (Vigna unguiculata (L.) Walp.) is an excellent crop for research in semi-arid regions, due to its tolerance to high temperatures and water…”
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Morphometry of pectoral muscle fiber and intestinal villi of Calidris pusilla during the wintering period in Brazil by Chaves, Felipe Q., Neri Júnior, Nailson A., Rodrigues, Roberta C., Araujo, Helder F.P., Guerra, Ricardo R.

“…Migration is an event observed in several animals, such as shorebirds moving between the northern and southern hemispheres, during breeding and wintering…”
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Keeping wild birds as pets in a semiarid region of Rio Grande do Norte State, northeastern Brazil by Bezerra, Dandara M. M., Araujo, Helder F. P., Alves, Rômulo R. N.

“…There is a wide variety of wild birds in the semiarid region of Brazil. Some of these birds are frequently used by local populations in various ways, and the…”
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Seasonality of insects in the semi-arid Caatinga of northeastern Brazil Sazonalidade de insetos na Caatinga do Nordeste Brasileiro by Alexandre Vasconcellos, Ricardo Andreazze, Adriana M. Almeida, Helder F. P. Araujo, Eduardo S. Oliveira, Uirandé Oliveira

“…Insects are essential to tropical ecosystems functioning. In semi-arid regions, the increase in abundance and/or activity (e.g. reproduction and foraging…”
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