scholarly journals Variação do índice de aridez e tendência climática à desertificação para a região semiárida do nordeste brasileiro (Variation of aridity index and climatic trend to desertification for the semi-arid region of the Brazilian Northeast)

2017 ◽  
Vol 10 (4) ◽  
pp. 1014 ◽  
Author(s):  
Iug Lopes ◽  
Saulo Medrado dos Santos ◽  
Brauliro Gonçalves Leal ◽  
Juliana Maria Medrado de Melo
Keyword(s):  
Arid Region ◽  
Aridity Index ◽  
Northeast Brazil ◽  
Climatic Trend ◽  
Target Region ◽  
Semi Arid Region ◽  
Aridity Indices ◽  
Brazilian Northeast ◽  
Semi Arid

Uma das formas mais simples e aplicadas para a verificação da Tendência a Desertificação (TD) é através dos Índices de Aridez (IA). Assim, com a possibilidade de verificação da situação do IA e da TD na Região Semiárida do Nordeste, o objetivo foi a investigação da variação do IA e suas classificações, ao longo do período de 1961 a 2015 (em séries temporais de 30 anos), além TD para a região alvo do estudo. É maioria unânime que está ocorrendo a redução do IA para a região semiárida do Nordeste, sendo que cada estado apresenta uma situação peculiar e possível justificativa para o que está ocorrendo. Apesar de mudanças do IA, em muitas localidades, observou-se que não ocorreu alterações na classificação a Tendência a Desertificação, porém apresentam a maior tendência desertificação e a sua é classificação é alta. Verificou-se que também é necessário o aprofundamento deste estudo, com mais variáveis e com o uso da modelagem numérica e de tendência no que diz respeito à avaliação da desertificação para algumas regiões que foram pouco conclusivas do Semiárido do Nordeste.  A B S T R A C TOne of the most useful and applied forms for verification of the Desertification Trend (TD) is through the calculation of the Aridity Indices (IA). Thus, the present work uses such methodology to verify the situation of IA and TD in the semi-arid region of Northeast Brazil. The objective was to investigate the variation of AI and its classifications over the period from 1961 to 2015, using a time series of 30 years, in addition to TD for the target region of the study. It is a consensus in the literature the occurrence of IA reduction for the semi-arid region of the Northeast, with each state presenting a peculiar situation and possible justification for the occurrence. With the results was possible to observe that in spite of changes of the IA in many localities, it was observed that there were no changes in the classification of the Tendency to Desertification. It was also verified the need to deepen these studies using climatic variables, with the use of more variables and with the use of numerical and trend modeling with regard to the evaluation of desertification for some regions that were not conclusive in this study.Keywords: Climate change, moving averages, climatology. 

Macroalgae Mariculture as a Social and Environmental Alternative for Coastal Traditional Communities of the Semi-Arid Region of Northeast Brazil

2020 ◽  
pp. 91-98
Author(s):  
Ivanilson de Souza Maia ◽  
Dárlio Inácio Alves Teixeira ◽  
Vigínia Maria Cavalari Henriques ◽  
Maulori Curié Cabral
Keyword(s):  
Arid Region ◽  
Northeast Brazil ◽  
Semi Arid Region ◽  
Semi Arid ◽  
Traditional Communities

Characterization and Classification of Soils in Semi-arid Region of Tatrakallu Village of Anantapuramu District in Andhra Pradesh

2019 ◽  
Vol 67 (4) ◽  
pp. 389
Author(s):  
G. Sashikala ◽  
M.V.S. Naidu ◽  
K.V. Ramana ◽  
K.V. Nagamadhuri ◽  
A. Pratap Kumar Reddy ◽  
...  
Keyword(s):  
Arid Region ◽  
Andhra Pradesh ◽  
Semi Arid Region ◽  
Semi Arid

scholarly journals Helminths infecting the cat-eyed snake Leptodeira annulata Linnaeus 1758 (Squamata: Dipsadidae) in a semiarid region of Brazil

2018 ◽  
Vol 55 (4) ◽  
pp. 281-285
Author(s):  
E. F. Fernandes De Carvalho ◽  
A. Ferreira Da Silva-Neta ◽  
C. De Sousa Silva ◽  
C. R. De Oliveira ◽  
J. Da Cunha Xavier Nunes ◽  
...  
Keyword(s):  
Arid Region ◽  
Paratenic Host ◽  
Nematode Species ◽  
Helminth Fauna ◽  
Semiarid Region ◽  
Northeast Brazil ◽  
Semi Arid Region ◽  
Semi Arid

Abstract Snakes have diverse feeding and living habits, being exposed to a variety of endoparasite communities. However, more studies are still necessary to document these relationships. We examined 18 specimens of the cat-eyed snake Leptodeira annulata from a semi-arid region in Northeast Brazil. Eight taxa of parasites were found, with higher prevalence of cystacanths (Acanthocephala). Five nematode species (Hexametra boddaertii, Oswaldocruzia sp., Oxyascaris sp., Physaloptera sp. and Raillietnema spectans) and the pentastome Raillietiella furcocerca represent a new parasitism record for the host studied. Our results also showed that L. annulata could act as paratenic host for acanthocephalans. These results contribute to the knowledge of the helminth fauna of L. annulata.

FLORISTIC AND VEGETATIONAL ASPECTS OF AN INSELBERG IN THE SEMI-ARID REGION OF NORTHEAST BRAZIL

2009 ◽  
Vol 66 (2) ◽  
pp. 329-346 ◽  
Author(s):  
P. Gomes ◽  
M. Alves
Keyword(s):  
Species Richness ◽  
Arid Region ◽  
Floristic Composition ◽  
Northeastern Brazil ◽  
Northeast Brazil ◽  
Surrounding Area ◽  
Floristic Inventory ◽  
Exposed Rock ◽  
Semi Arid Region ◽  
Semi Arid

Inselbergs are rocky environments that support a unique flora distinct from that of the surrounding area. The objectives of this work were to conduct a floristic inventory of an inselberg in the semi-arid region of Northeast Brazil, and to investigate the relationship between its flora and the flora of the surrounding area. The following questions were addressed: is the species richness comparable to other inselbergs in northeastern Brazil; is the floristic composition of the inselberg more similar to other inselbergs or to the surrounding Caatinga vegetation; and do the similarities in the floristic composition of inselbergs depend on the distance between them? This work documents 201 species in 62 families. Cyperaceae (28 spp.), Euphorbiaceae (19), Poaceae (15), Orchidaceae (11) and Bromeliaceae (9) are the most species-rich families. On the inselberg the plants are distributed in islands found on exposed rock, in fissures and in depressions in the rock. Variations in species richness in the region were assessed by comparison of floristic inventories conducted in other inselbergs of the semi-arid region with those of this study. The flora of the inselberg under investigation is more similar to the flora of other nearby inselbergs than to the vegetation of the surrounding semi-arid region.

Columnar-integrated aerosol optical properties and classification of different aerosol types over the semi-arid region, Anantapur, Andhra Pradesh

2015 ◽  
Vol 527-528 ◽  
pp. 507-519 ◽  
Author(s):  
Rama Gopal K ◽  
Arafath S.Md ◽  
Balakrishnaiah G ◽  
Raja Obul Reddy K ◽  
Siva Kumar Reddy N ◽  
...  
Keyword(s):  
Optical Properties ◽  
Arid Region ◽  
Andhra Pradesh ◽  
Aerosol Optical Properties ◽  
Semi Arid Region ◽  
Aerosol Types ◽  
Semi Arid

scholarly journals Analysis of the NDVI Temporal Dynamics in Semi-arid Ecosystems: Brazilian Caatinga and African Western Sahel (Análise da Dinâmica Temporal do NDVI nos Ecossistemas Semi-áridos: Caatinga Brasileira e Sahel Ocidental Africano)

2011 ◽  
Vol 4 (2) ◽  
pp. 300 ◽  
Author(s):  
Humberto Alves Barbosa ◽  
T.V. Lakshimi Kumar ◽  
Ivon Wilson da Silva Junior
Keyword(s):  
El Niño ◽  
Arid Region ◽  
Temporal Dynamics ◽  
El Nino ◽  
Arid Ecosystems ◽  
Northeast Brazil ◽  
Vegetation Types ◽  
Semi Arid Region ◽  
Semi Arid ◽  
African Sahel

Os resultados indicaram que o efeito causado pelo evento El Niño, nos vários tipos de vegetação na região semi-árida do Nordeste do Brasil, durante as duas últimas décadas do século passado, apresentou diferentes padrões sazonais e interanuais dos tipos de vegetação no Sahel africano. A amplitude sazonal na variação do Índice de Vegetação Diferença Normalizada – NDVI, no Sahel Africano não foi alterada pelo efeito climático do El Niño, no entanto, na região semi-árida do Nordeste do Brasil, os tipos de vegetação foram afetados durante os eventos El Niño. Além disso, observou-se que o NDVI varia de acordo com as condições climáticas locais, apresentando uma lacuna temporal entre a ocorrência de precipitação e absorção de água disponível na vegetação. Esta informação é importante para mostrar condições de contorno para os modelos climáticos e também para a previsão numérica de tempo.  Palavras-chave: Vegetação, Aridez . Satelite  Análise da Dinâmica Temporal do NDVI nos Ecossistemas Semi-áridos: Caatinga Brasileira e Sahel Ocidental Africano   ABSTRACT The results indicated that the effect caused by the El Niño event in the various types of vegetation in the semi-arid region of Northeast Brazil during the last two decades of the last century, presented a differing seasonal and interannual patterns from the vegetation types in the African Sahel. The seasonal amplitude of Normalized Difference Vegetation Index - NDVI variation in the African Sahel was not altered by the climatic effect of El Niño, however, in the semi-arid region of Northeast Brazil, the vegetation types were affected during the El Niño events. Furthermore, it was observed that the NDVI varies according to the local climatic conditions, presenting a temporal gap between the precipitation occurrence and water absorption available from the vegetation. This information is important to show contour conditions for climatic models and also for the weather numerical forecasting.   Keywords: Vegetation, drought, satellite.

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