Survival Strategies of Howler Monkeys in the Atlantik Ormanı Revealed

A new study conducted in the protected areas of the Atlantik Ormanı, located in the São Paulo state of Brezilya, has revealed the survival strategies of howler monkeys (bugio). Scientists closely observed a group of six monkeys for 63 days, from august of 2023 to ocak 2024. The monkeys' entire daily routines, from sunrise to bedtime, were recorded. This comprehensive fieldwork aimed to understand how the animals responded to environmental factors and the presence of other primate species. The research took place in the large and uninterrupted forest ecosystem of Carlos Botelho Eyalet Parkı.

One of the most striking findings of the study is that rising temperatures and leaf consumption significantly slow down the monkeys' movement. When consuming fibrous leaves that are difficult to digest, these primates were observed to need more rest and cover shorter distances throughout the day. Additionally, increasing temperatures caused the monkeys to extend their resting periods to conserve energy. This situation demonstrates how decisive dietary habits and climate conditions are on the daily behavior of this species. Experts note that thanks to this slowdown, the monkeys are able to save energy.

As part of the study, scientists also evaluated the impact of other primate species living in the region on howler monkeys. According to the research, when larger-bodied primates like the southern muriqui and capuchin (macaco-prego) monkeys roaming in large troops arrive in the area, howler monkeys leave the area. This is considered concrete evidence of space and resource competition among different species in the forest ecosystem. Although capuchin monkeys are individually smaller, they have the power to drive howler monkeys away from their resting and feeding areas by moving as a group. Therefore, the presence of neighboring species stands out as one of the main factors shaping the monkeys' daily movement routes.

The research also brought to light behavioral differences between populations living in large protected forested areas and those in small, fragmented forest patches. It was discovered that in massive and uninterrupted habitats like Carlos Botelho Eyalet Parkı, monkeys make less noise. Out of the 63-day monitoring period, scientists struggled to find the group for 26 days not only because of their vocalizations but because they stayed silent. In contrast, groups living in smaller forest fragments were observed to assert their territorial presence much more frequently by vocalizing. According to researchers, this frequency of communication is due to the higher risk of encountering rival groups and, consequently, higher territorial tensions in small areas.

The mentioned study stands out for using an innovative statistical model that simultaneously analyzes multiple variables such as temperature, diet, resting periods, and interactions with other primates. This model successfully explained 70 percent of the variations in the distance covered by the group daily, achieving a superior result compared to previous studies. During the monitoring process, it was determined that the monkeys traveled an average of 531 meters per day and used approximately 25 hectares of the park's 38 thousand hectares. This data is of great importance for understanding the needs of this endangered monkey species, developing conservation strategies, and guiding future reintroduction projects.