Related Experiment Video
Updated: Mar 27, 2026
10:21
Population Replacement Strategies for Controlling Vector Populations and the Use of Wolbachia pipientis for Genetic Drive
Published on: July 4, 2007
11.2K
Reframing vector control: land use and climate shape malaria risk in Amazonian communities
André Luis Acosta1,2, Eduardo Sterlino Bergo3, Elder Augusto G Figueira4
1Universidade de São Paulo, Faculdade de Saúde Pública, Departamento de Epidemiologia, São Paulo, SP, Brasil.
Memorias Do Instituto Oswaldo Cruz
|March 25, 2026
Summary
Malaria vector activity in the Amazon is driven by local environmental conditions. Floodable vegetation and temperature significantly impact Nyssorhynchus darlingi biting rates, guiding targeted elimination strategies.
Area of Science:
- Environmental Science
- Ecology
- Public Health
Background:
- Malaria poses a significant public health threat in the Brazilian Amazon.
- Ecological complexity and socioeconomic factors complicate vector control efforts.
- Nyssorhynchus darlingi, the primary malaria vector, exhibits varied distribution influenced by environmental changes.
Purpose of the Study:
- To determine the influence of land cover and microclimate on the human biting rate (HBR) of Nyssorhynchus darlingi.
- To analyze these factors across diverse Amazonian ecoregions.
Main Methods:
- Human landing catches were conducted at 70 sites across four ecoregions to measure HBR.
- Temperature and humidity were recorded concurrently; landscape composition was analyzed using buffer zones (100m, 250m, 500m).
- Statistical analyses included linear regressions, mixed-effects models, and principal component analysis.
Main Results:
- A total of 14,689 mosquito bites were recorded.
- Human biting rate (HBR) peaked in areas with moderate forest degradation.
- Higher temperatures and lower humidity correlated with increased HBR, with floodable vegetation being a key predictor at the 500m scale.
Conclusions:
- Local environmental factors, especially floodable vegetation near settlements, are critical drivers of Nyssorhynchus darlingi activity.
- Spatially targeted, climate-informed strategies are essential for effective malaria vector elimination in the Amazon.
- Understanding land cover and microclimate is vital for malaria control programs.
Related Concept Videos
01:27Microbes and Climate Change
46
Microorganisms are pivotal agents in Earth's biogeochemical cycles, significantly influencing climate dynamics through their metabolic activities. These microbes modulate the levels of key greenhouse gases by both contributing to and helping mitigate climate change.Microbial Contributions to Greenhouse Gas EmissionsRising global temperatures accelerate microbial metabolism, which, in turn, speeds up the decomposition of organic matter. This process releases carbon dioxide (CO₂) through...
46
01:17Design Example: Analyzing Capacity Contours for Flood Risk Assessment
377
Flood risk assessment involves careful planning and analysis to ensure the safety of communities near water retention structures. Capacity contours are a vital tool in this process, as they illustrate the potential spread of water at specific levels in a given area. In the context of building a bund across a small valley, these contours play a critical role in evaluating the safety of nearby residential areas.In this example, the bund is intended to store stormwater in the valley. The engineers...
377
01:50Global Climate Change
29.7K
Throughout its ~4.5 billion year history, the Earth has experienced periods of warming and cooling. However, the current drastic increase in global temperatures is well outside of the Earth’s cyclic norms, and evidence for human-caused global climate change is compelling. Paleoclimatology, the study of ancient climate conditions, provides ample evidence for human-caused global climate change by comparing recent conditions with those in the past.
29.7K
01:50Threats to Biodiversity
27.8K
There have been five major extinction events throughout geological history, resulting in the elimination of biodiversity, followed by a rebound of species that adapted to the new conditions. In the current geological epoch, the Holocene, there is a sixth extinction event in progress. This mass extinction has been attributed to human activities and is thus provisionally called the Anthropocene. In 2019 the human population reached 7.7 billion people and is projected to comprise 10 billion by...
27.8K
02:31Habitat Fragmentation
21.9K
Habitat fragmentation describes the division of a more extensive, continuous habitat into smaller, discontinuous areas. Human activities such as land conversion, as well as slower geological processes leading to changes in the physical environment, are the two leading causes of habitat fragmentation. The fragmentation process typically follows the same steps: perforation, dissection, fragmentation, shrinkage, and attrition.
21.9K
01:25Arboviral Encephalitis
19
Arboviral encephalitis refers to brain inflammation caused by arthropod-borne viruses, particularly those transmitted through mosquito vectors. Among these, West Nile virus (WNV), a member of the Flaviviridae family, is a significant public health concern. WNV is an enveloped, positive-sense, single-stranded RNA virus. Human infection typically begins when an infected mosquito introduces the virus into the dermis during feeding. The primary transmission cycle involves birds as amplifying hosts...
19