Os climas naturais do município de Belo Horizonte – MG

Assis, Wellington Lopes

doi:10.5654/actageo2012.0002.0008

Cited by 5 publications

(4 citation statements)

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“…This condition demonstrates that the nine districts of Belo Horizonte, where the Ae . aegypti mosquitoes were collected in the present study, have distinct natural environmental conditions [ 67 ], which may be related to the inter-population differences in the vector’s infection responses that are phenotypically determined by variability in their physical barriers and/or their natural defense responses for confronting the arboviruses [ 68 , 69 ].…”

Section: Discussionmentioning

confidence: 99%

Dengue and Zika virus infection patterns vary among Aedes aegypti field populations from Belo Horizonte, a Brazilian endemic city

et al. 2021

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Dengue virus (DENV) and Zika virus (ZIKV) belong to the same viral family, the Flaviviridae. They cause recurring threats to the public health systems of tropical countries such as Brazil. The primary Brazilian vector of both viruses is the mosquito Aedes aegypti. After the mosquito ingests a blood meal from an infected person, the viruses infect and replicate in the midgut, disseminate to secondary tissues and reach the salivary gland (SG), where they are ready to be transmitted to a vertebrate host. It is thought that the intrinsic discrepancies among mosquitoes could affect their ability to deal with viral infections. This study confirms that the DENV and ZIKV infection patterns of nine Ae. aegypti field populations found in geographically separate health districts of an endemic Brazilian city vary. We analyzed the infection rate, disseminated infection, vector competence, and viral load through quantitative PCR. Mosquitoes were challenged using the membrane-feeding assay technique and were tested seven and fourteen days post-infection (early and late infection phases, respectively). The infection responses varied among the Ae. aegypti populations for both flaviviruses in the two infection phases. There was no similarity between DENV and ZIKV vector competencies or viral loads. According to the results of our study, the risk of viral transmission overtime after infection either increases or remains unaltered in ZIKV infected vectors. However, the risk may increase, decrease, or remain unaltered in DENV-infected vectors depending on the mosquito population. For both flaviviruses, the viral load persisted in the body even until the late infection phase. In contrast to DENV, the ZIKV accumulated in the SG over time in all the mosquito populations. These findings are novel and may help direct the development of control strategies to fight dengue and Zika outbreaks in endemic regions, and provide a warning about the importance of understanding mosquito responses to arboviral infections.

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Section: Discussionmentioning

confidence: 99%

Dengue and Zika virus infection patterns vary among Aedes aegypti field populations from Belo Horizonte, a Brazilian endemic city

et al. 2021

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“…The study was conducted in a population of S. reniformis in the Reserva Natural Serra do Curral (19°58′00″ W, 43°55′00″ S), an area of transition between Atlantic Forest and Cerrado in Belo Horizonte, Brazil. The study site is located at an altitude of 1150–1510 m. The climate is tropical, with well‐defined dry and rainy seasons, average annual precipitation of 1600 mm and an average annual temperature of 20 °C (Assis ). Fieldwork and experiments were conducted during the flowering period of the species, from March to June of 2014, 2015 and 2017, which corresponds to the end of the rainy season and the beginning of the dry season.…”

Section: Methodsmentioning

confidence: 99%

Heteranthery as a solution to the demand for pollen as food and for pollination – Legitimate flower visitors reject flowers without feeding anthers

2017

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Heteranthery, the presence of feeding and pollinating anthers in the same flower, seems to mediate the evolutionary dilemma for plants to protect their gametes and yet provide food for pollinators. This study aims to elucidate the role of heteranthery in the buzz-pollinated Senna reniformis. The fecundity of pollen from long-, medium- and short-sized anthers was determined by hand cross-pollination experiments, and the quantity, size, ornamentation and viability of pollen of different anthers were compared. Rates of flower rejection by bees were measured in anther removal experiments to assess the preferences of flower visitors for feeding or pollinating anthers. Large bees, which were the effective pollinators of self-incompatible S. reniformis, avoided flowers without short feeding anthers, but not those without medium or long anthers. Illegitimate small and medium-sized bees were unresponsive to anther exclusion experiments. Long anthers deposited pollen on the back and short anthers on the venter of large bees. Pollen from long anthers had higher in vitro viability and higher fruit and seed set after cross-pollination than pollen from other sized anthers. Short anthers produce feeding pollen to effective pollinators and long anthers are related to pollination of S. reniformis. Bee behaviour and size was found to directly influence the role of anthers in the 'division of labour'. Only large bee pollinators that carry the pollinating pollen from long anthers in 'safe sites' associated short anthers with the presence of food. In the absence of these larger bee pollinators, the role of heteranthery in S. reniformis would be strongly compromised and its function would be lost.

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“…O município está localizado a uma altitude média de 852 metros acima do nível do mar, apresenta clima classificado como tropical de altitude, caracterizado por verões moderadamente quentes e úmidos e invernos secos com baixas temperaturas. A média anual de precipitação é de cerca de 1.400 mm 20,21 .…”

Section: áRea De Estudounclassified

ArboAlvo: método de estratificação da receptividade territorial às arboviroses urbanas

et al. 2022

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OBJETIVO: Apresentar a metodologia de estratificação das arboviroses urbanas (dengue, zika e chikungunya) pelo índice de receptividade territorial, instrumento de vigilância e controle dessas doenças que considera a heterogeneidade territorial intramunicipal. MÉTODOS: Estudo ecológico que utiliza como unidade de análise as áreas de abrangência dos centros de saúde de Belo Horizonte (MG). Para a construção do índice de receptividade territorial foram selecionados indicadores de determinação socioambiental das arboviroses urbanas a fim de integrar à análise de componentes principais. As componentes resultantes foram ponderadas por análise de processos hierárquicos (AHP) e agregadas por meio de álgebra de mapas. RESULTADOS: O índice de receptividade territorial evidenciou grande heterogeneidade das condições de infraestrutura urbana. As áreas classificadas como alta e muito alta receptividade correspondem a aproximadamente 33% da área ocupada e se concentram sobretudo nas regiões de planejamento administrativo Leste, Nordeste, Norte, Oeste e Barreiro, principalmente em áreas limítrofes do município. Quando sobrepostas à densidade de casos de dengue e de ovos de Aedes em 2016, a estratificação pelo índice de receptividade territorial às arboviroses urbanas demonstra que áreas de muito alta receptividade apresentam uma densidade de casos, bem como de ovos de Aedes superior àquela observada nas demais áreas da cidade, o que corresponde a um percentual bastante reduzido do território municipal (13,5%). CONCLUSÕES: As análises indicam a necessidade do desenvolvimento de ações de vigilância e controle adequadas para cada contexto, superando, assim, a lógica de alocação homogênea em todo o território.

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Os climas naturais do município de Belo Horizonte – MG

Cited by 5 publications

References 0 publications

Dengue and Zika virus infection patterns vary among Aedes aegypti field populations from Belo Horizonte, a Brazilian endemic city

Dengue and Zika virus infection patterns vary among Aedes aegypti field populations from Belo Horizonte, a Brazilian endemic city

Heteranthery as a solution to the demand for pollen as food and for pollination – Legitimate flower visitors reject flowers without feeding anthers

ArboAlvo: método de estratificação da receptividade territorial às arboviroses urbanas

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