Why Dung Beetles Are Digging Deeper and What It Reveals About Surviving a Hotter Planet

With an increase in worldwide temperatures, even the smallest of creatures are adapting to the new changes in their environment. However, subtle or striking they may be, dung beetles are no exception to this phenomenon. According to recent observations, as documented by Science News, some species of dung beetles have begun to dig deeper tunnels in which to lay their eggs, which is proving to be an effective way of protecting their young from the rising surface temperatures.

This, in itself, is a significant example of how insects are not only coping with the effects of climate change but are, in fact, adapting to them in a way that is proving to be beneficial to their survival.

Digging deeper to stay cool

The temperate rainbow scarab, which is also known as a common dung beetle, has shown a consistent trend of digging nests deeper in response to warmer conditions.

According to reports by Science News, this is evident in their behavior. According to scientists, this is not random but is in response to cues from their environment.

They have noted that “even small increases in nesting depth can significantly reduce the temperature experienced by developing larvae. This is the difference between success and failure in extreme heat." There is an evident relationship between rising temperatures and reproductive behavior. This is evident in controlled experiments.

Reproduction under pressure

Apart from digging deeper, dung beetles are also altering their investment in their offspring, as mentioned in a 2022 scientific journal published in PubMed Central. The journal revealed that when the environment is subjected to more warmth, the female dung beetles are likely to produce more brood balls but of smaller sizes, indicating that the strategy of spreading risks is more significant than investing more in the offspring.

This is revealed as an example of adaptive plasticity, which is the capacity of the dung beetle to adjust its reproduction strategy in line with environmental stress. This is also revealed as an example of the general trend of other insects in the face of climate change.

Heat changes parenting behavior

This not only influences where the eggs are placed, but also how the parents behave after the eggs are laid. A study published in a journal called Insects found that burying beetles exhibit a reduction in parental behavior as a result of exposure to high temperatures.

The study states that this may be a result of metabolic stress, where the beetles are conserving energy to survive. The study further states that “elevated temperatures can alter the balance between parental effort and self-maintenance,” and this adds another layer of complexity to how climate change affects reproduction.

Creative ways to beat the heat

Dung beetles also employ rather ingenious strategies to deal with heat, especially while performing their daily activities.

According to a study that was published in the Journal of Experimental Biology, certain dung beetles have been observed climbing onto their dung balls to cool themselves. The scientists referred to this as a “behavioral cooling mechanism” where the beetles use their environment to regulate their temperature.

The surface temperature of certain environments may even rise to as high as 60 degrees Celsius, and as a result, it may not be safe for the beetles to make direct contact.

Body and metabolism also adapt

Exposure to higher temperatures over long periods may also affect the physical attributes of the dung beetles.

According to studies referenced in ScienceDirect, when dung beetles are raised in higher-temperature conditions, they end up having smaller body sizes. The studies argue that having smaller body sizes helps the beetles conserve energy and become tolerant to heat.

The studies further explain that having smaller body sizes means that the beetles will consume less energy and generate less heat. This demonstrates that adaptation is not just about behavior but also about the physiological aspects.

What this tells us about climate survival

Collectively, these studies paint a picture of how dung beetles are adapting to a warmer world, and it's a combination of behaviors, reproductive strategies, and physiological responses. While each of these adaptations may not seem significant in and of itself, taken as a whole, they are a formidable survival strategy.

As a number of studies, as cited by Science News and PubMed, have shown, these beetles are exhibiting a level of adaptability that may be key to survival in a rapidly changing world.

While the study of dung beetles may not be of particular interest to anyone but entomologists, for scientists, this study may prove significant as a way of illustrating how other small, temperature-dependent animals may adapt to climate change.

The fact that these beetles are able to adapt so readily, both instinctively and in reaction to environmental cues, shows that sometimes, survival in nature can be a simple yet highly effective thing.