Ecology to Epidemiology: How Forest Loss Is Increasing Mosquitoes Thirst for Human Blood

Forests are not only important for climate regulation and biodiversity conservation they are also critical for maintaining ecological balance and protecting human health.

- Monikandon Sukumaran *, Kesavan Devarayan and Ramar Marimuthu

Over the past few decades, rapid deforestation caused by agriculture, urban expansion and industrial development has transformed natural ecosystems worldwide. One of the less obvious but highly dangerous consequences of forest loss is the change in mosquito behaviour. Instead of declining when forests disappear, mosquitoes adapt to new environments and increasingly feed on human blood.

Recent scientific research shows that mosquitoes in degraded forest ecosystems are shifting their feeding preference from wildlife to humans. This shift dramatically increases the risk of mosquito borne diseases such as malaria, dengue, Zika, chikungunya and yellow fever. Understanding why this happens and how it can be prevented is essential for protecting public health and environmental sustainability.

How Forest Loss Changes Mosquito Behaviour

Forests provide diverse habitats filled with birds, mammals, reptiles and amphibians. These animals act as natural blood sources for mosquitoes. When forests are destroyed biodiversity declines and mosquitoes lose many of their traditional hosts. Studies from the Atlantic Forest in Brazil show that mosquitoes now show strong preference for feeding on humans in fragmented forest landscapes. Researchers found that when forests shrink and wildlife populations decrease mosquitoes are forced to find alternative blood sources and humans become the most accessible option.