Biologia De Anofelinos Amazônicos. XXL Ocorrrência De Espécies De Anopheles E Outros Culicídeos Na Área De Influência Da Hidrelétrica De Balbina - Cinco Anos Após O Enchimento Do Reservatório

Quintero, Lisardo Osório; Thatcher, Bedsy Dutary; Tadei, Wanderli Pedro

doi:10.1590/1809-43921996264296

Cited by 20 publications

(5 citation statements)

References 2 publications

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“…We detected a uniform behavior of anophelines, with peaks above the tolerance range during flooding months due to high rainfall rates. This finding is consistent with the study by Quintero et al (1996), who observed an increase in the population of anophelines during flooding periods after the formation of the reservoir of the Balbina Hydroelectric Plant in the Amazonas state, Brazil. It is important to highlight the great heterogeneity of the Anophelinae among the collection sampling sites, a finding similar to that of Martins et al (2018).…”

Section: Discussionsupporting

confidence: 93%

Ecological characterization of mosquitoes (Diptera: Culicidae) in areas of the Mato Grosso Pantanal, Mato Grosso State, Brazil

et al. 2021

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Bimonthly diurnal and nocturnal captures were conducted in four different sampling sites of the Mato Grosso Pantanal region over 24 consecutive months between March 2009 and January 2011. The goal of performing these collections was to elucidate aspects of the biology and ecology of mosquitoes in this region since little to nothing is known about these aspects for many species. A total of 17,532 specimens were captured, comprising two subfamilies, nine genera, and 44 species. The main species of culicids found in the Mato Grosso Pantanal had strong ecological compatibility with well-preserved environments and with some of the specific habitats found in at least one of the four selected collection sampling sites. Anopheles darlingi, An. albitarsis, and An. triannulatus are well-suited to environments with large water bodies and greater anthropic activity. Culex nigripalpus and Cx. quinquefasciatus prefer environments with bush fragments and pronounced human action and movement. Culex declarator and Psorophora albigenu, the most eclectic, prefer wild areas and with some anthropic activity. Mansonia titillans is associated with environments offering a wide variety of natural breeding areas that enable its development, in particular natural swamp areas covered with macrophytes, which is one of the natural components of the Pantanal biome. The effect of the flooding season on the population density of anophelines is especially advantageous, with an explosion in the number of individuals in periods of widespread flooding. The region’s environmental dynamics are regulated by flooding cycles with alternating periods of flooding and drought, which are the main factors governing the ecology of the local fauna and flora. Flooding periods contribute to raising culicid species’ richness and diversity, while the droughts result in a more even distribution of specimens within species. The flooding season of the Pantanal occurs between November and May and coincides with the greatest abundance of culicid species. During this period, the human population of the region has greater contact with mosquito vectors carrying pathogens, including arboviruses, which previous studies have confirmed via seropositivity in the region’s equines and birds.

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Section: Discussionsupporting

confidence: 93%

Ecological characterization of mosquitoes (Diptera: Culicidae) in areas of the Mato Grosso Pantanal, Mato Grosso State, Brazil

et al. 2021

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“…darlingi is generally bimodal, occurring at the beginning of dusk and at dawn 37 , 38 . However, patterns of biting activity can be influenced by location, vector density, seasonality, presence of hosts, types of houses and the distance between dwellings and the forest 16 , 21 , 34 , 39 . The biting activity in our areas of study was constant during the whole night, though more activity was registered at dusk.…”

Section: Discussionmentioning

confidence: 99%

Description of malaria vectors (Diptera: Culicidae) in two agricultural settlements in the Western Brazilian Amazon

Andrade

Santos

Castro

et al. 2021

Rev. Inst. Med. trop. S. Paulo

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The majority of malaria cases in South America occur in rural areas of the Amazon region. Although these areas have a significant impact on malaria cases, few entomological studies have been carried out there. This study aimed to describe entomological parameters in settlements in Rondonia State, Brazil. Collections of anopheles were carried out using the Protected Human Attraction Technique (PHAT). The risk and the potential for malaria transmission were assessed using the human biting rate (HBR), the sporozoite rate (SR) and the entomological inoculation rate (EIR). The results confirmed that Nyssorhynchus darlingi is the predominant species in the two studied locations. Although settlement in the two study sites has occurred at different times, the species richness found was low, showing that environmental changes caused by anthropological actions have probably favor the adaptation of Ny. darlingi species. From the total of 615 anopheline mosquitoes assessed, seven (1.1%) were positive for Plasmodium sp. infections. The EIR revealed that Ny. darlingi contributes to malaria transmission in both locations, as it was responsible for 0.05 infectious bites in humans at night in the old settlement and 0.02 in the recent occupation. In the two study sites, the biting occurred more frequently at dusk. Nyssorhynchus darlingi was prevalent in areas of recent colonization but, even when present in a low density, this species could maintain the transmission of malaria in the older settlement. The entomological information obtained in this study is important and may aid the selection of vector control actions in these locations.

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“…darlingi, in general is bimodal, occurring at the beginning of dusk and at dawn [47][48][49]. However, patterns of biting activity can be in uenced by location, vector density, seasonality, presence of hosts, types of housing and the distance between dwellings and the forest [21,26,40,50,51].…”

Section: Discussionmentioning

confidence: 99%

Investigation of Malaria Vectors (Diptera: Culicidae) in Agricultural Settlements in the Amazon Region of Brazil

Andrade¹,

Santos²,

Castro³

et al. 2021

Preprint

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Background: Environmental changes resulting from the urbanization process represent a challenge for malaria control. The majority of malaria cases in South America occur in rural areas, areas of recent occupation, mining and indigenous areas of the Amazon region. Although these areas have a significant impact on malaria cases, few entomological studies have been carried out in areas of recent occupation. This study aimed to describe the density, natural infection rate and hematophagic behavior of anopheline species in two settlements in the state of Rondonia, Brazil in order to understand how malaria transmission occurs in areas that have been settled at different times.Methods: An area of recent occupation, denominated Acampamento Fortaleza (AF), and an old settlement, denominated Projeto de Assentamento Florestal Jequitibá (PAFJ), were studied. Peridomicile collections of anopheles were carried out using the Protected Human Attraction Technique (PHAT). The risk and potential for malaria transmission were assessed using the human biting rate (HBR), sporozoite rate (SR) and the entomological inoculation rate (EIR).Results: The results confirmed that Nyssorhynchus darlingi, the main vector responsible for the transmission of malaria in the state of Rondônia, is the predominant species in the two studied locations. Although settlement of the two study sites has occurred at different times, the species richness found was low, showing that the environmental changes caused by anthropological actions probably favor the adaptation of the Ny. darlingi species. Of the 615 anopheline mosquitoes assessed, 7 (1.1%) were positive for Plasmodium infections. The EIR revealed that Ny. darlingi contributes to the transmission of malaria in both locations, since it was responsible for 0.41 infectious bites in humans at night in PAFJ and 0.16 in AF. In the two study sites, the biting occurred more frequently at dusk.Conclusions: Ny. darlingi is the principal vector found in the studied locations. Its prevalence occurs in areas of recent colonization but, even when present in a low density, this species could maintain transmission of malaria in an older settlement. The entomological information obtained in this study is important and may aid the selection of vector control actions in these locations that are considered as having a high risk of malaria transmission.

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Biologia De Anofelinos Amazônicos. XXL Ocorrrência De Espécies De Anopheles E Outros Culicídeos Na Área De Influência Da Hidrelétrica De Balbina - Cinco Anos Após O Enchimento Do Reservatório

Cited by 20 publications

References 2 publications

Ecological characterization of mosquitoes (Diptera: Culicidae) in areas of the Mato Grosso Pantanal, Mato Grosso State, Brazil

Ecological characterization of mosquitoes (Diptera: Culicidae) in areas of the Mato Grosso Pantanal, Mato Grosso State, Brazil

Description of malaria vectors (Diptera: Culicidae) in two agricultural settlements in the Western Brazilian Amazon

Investigation of Malaria Vectors (Diptera: Culicidae) in Agricultural Settlements in the Amazon Region of Brazil

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