In the Rock of Gibraltar, the Barbary macaques are facing changes in their diet due to interaction with tourists. In this context, a species adapted to consume fruits, leaves, and roots is incorporating ultra-processed foods.
Moreover, although there is a regulation prohibiting feeding them, many visitors continue offering food. Therefore, it is estimated that up to 20% of feeding time is linked to human-origin products.
Additionally, the annual flow of over 800,000 visitors intensifies this issue. Consequently, the tourist pressure modifies natural habits and affects the ecosystem balance.
Geophagy: a response to the altered diet
Research published in Scientific Reports shows that these primates have developed a particular behavior: geophagy. Indeed, they consume soil to counteract the effects of processed food.
On the other hand, this behavior was observed on multiple occasions between 2022 and 2024. Thus, a direct relationship was identified between the intake of human foods and the subsequent consumption of soil.
Furthermore, the macaques prefer reddish clays present in the environment. Consequently, this behavior is interpreted as a form of digestive regulation in response to an inadequate diet.
Negative impacts on the species’ health
The incorporation of ultra-processed foods generates harmful effects on the health of the macaques. Firstly, the excess of sugars and fats affects their metabolism, which is not adapted to these components.
Moreover, products like ice creams and sweets contain lactose, which is difficult to digest for most primates after weaning. Therefore, digestive disorders and nutritional imbalances occur.
On the other hand, the low fiber content in these foods alters their digestive system. Consequently, the animals resort to soil ingestion as a compensatory mechanism, highlighting an underlying problem.
Comparisons with other populations and scientific evidence
The phenomenon observed in Gibraltar is not replicated with the same intensity in other populations. In this regard, comparative studies show that geophagy is infrequent in wild macaques in Morocco and Algeria.
Likewise, in environments without tourist pressure, this behavior is rare or nonexistent. Thus, the relationship between human intervention and changes in animal behavior is reinforced.
Additionally, similar cases are recorded in other species of the Macaca genus in tourist contexts. Consequently, a global pattern linked to human contact is evident.
Conservation and environmental responsibility
The situation presents a challenge for wildlife conservation. Firstly, it becomes necessary to strengthen regulations and controls over interaction with wild animals.
Moreover, environmental education for visitors is key to reducing negative impacts. Consequently, a more responsible and conscious tourism is promoted.
Finally, protecting the natural diet of the macaques implies preserving their health and the ecosystem balance. Thus, the importance of respecting natural processes in areas of high ecological value is reaffirmed.
