Climate Change Poses Serious Threat to Amazon Dung Beetles

Mar 30, 2026, 2:29 AM

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Rising temperatures are posing a serious threat to dung beetle populations in the Amazon, highlighting a trend that could push many local insect species to their thermal limits. Researchers from the Universities of Würzburg and Bremen conducted a comprehensive study revealing that temperature is the decisive factor for the beetles' living conditions, while other factors like soil moisture and food supply are less significant.

Dung beetles play a critical role in forest ecosystems by removing feces from wild animals, thereby inhibiting the spread of parasites. They also work dung into the soil, supplying essential nutrients to plants. However, the study indicates that climate change could lead to a decline in both species diversity and population sizes of these vital insects.

In their research conducted in the Amazon region of Peru, scientists studied dung beetle populations at altitudes ranging from 250 to 3,500 meters above sea level. They found that diversity and abundance were highest at around 500 meters, where temperatures are optimal for the beetles. Surprisingly, the number of species dropped sharply between altitudes of 500 and 250 meters, reflecting the negative impact of higher temperatures on beetle populations.

Dr Kim Holzmann, a research associate involved in the study, noted that at 500 meters, the climate conditions are ideal for dung beetles, while lower altitudes experience heat stress that contributes to their decline. The study collected nearly 5,000 dung beetles, which were trapped using dung, fruit, and carrion as bait during 2022 and 2023.

The implications of climate change extend beyond dung beetles, as the research indicates that up to half of the insect species in the Amazon lowlands could reach their heat thresholds due to rising temperatures. Dr Marcell Peters, an animal ecologist, emphasized that while insects at higher altitudes can adapt their heat tolerance in the short term, many lowland species lack this ability and face significant danger.

This study is part of a broader examination of the effects of climate change on biodiversity in the Amazon. Previous research has shown that human-modified ecosystems in Brazil have already experienced substantial declines in dung beetle diversity, particularly following droughts and fires exacerbated by climate events like the 2015-2016 El Niño. In fact, forests that burned during this period lost an average of 64% of their dung beetle species, while drought alone led to a 20% decline.

The loss of dung beetles has serious repercussions for ecosystem services, as these insects are essential for nutrient cycling, seed dispersal, and maintaining soil health. Filipe França, an associate researcher, highlighted the importance of dung beetles as indicators of forest health, noting that their decline signifies broader ecological distress.

As climate change continues to impact the Amazon, the interaction between rising temperatures, deforestation, and human-induced fires poses dire implications for not just dung beetles but also for biodiversity and forest carbon storage. Experts warn that without immediate action to curb deforestation and greenhouse gas emissions, the Amazon could face irreversible damage, turning from a carbon sink into a carbon source by 2030.

In summary, the urgent findings from these studies underscore the need for increased research and conservation efforts to protect dung beetles and the vital ecological services they provide in the Amazon rainforest. Understanding the cascading effects of their decline on other species and ecosystems is crucial for addressing the challenges posed by climate change in this biodiverse region.

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