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Home SCIENCE NEWS Atmospheric Science

Hybrid strategy captures a larger picture of wild mandrills

December 7, 2021
in Atmospheric Science
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Kyoto, Japan — “Direct tracking of mandrills is a really tough job.”

A collage of images depicting a multi-method approach.

Credit: Kyoto University/Shinya Hongo

Kyoto, Japan — “Direct tracking of mandrills is a really tough job.”

Kyoto University’s Shun Hongo and his team spent five years following a primate group through the rainforests of Moukalaba-Doudou National Park in southern Gabon using their long-distance calls as a guide.

GPS telemetry is a researcher’s preferred method of studying animal movements accurately as it covers a wider range of habitats. Mandrills, on the other hand, may feel differently about that choice as the animal would need to be anesthetized and captured.

Directly following and observing animals is a non-invasive way to record their movement and behavioral data, but this is also labor-intensive for the researchers and involves a lot of sweat and bloody cuts. Following animals is, therefore, less cost-effective in retrieving sufficient data as a method of generalizing the findings to the study population.

The use of camera traps resolves this issue. In a marriage of ideas, trail cameras complement data from direct observation and create a more complete picture of the general trend of mandrill movement.

Hongo’s team also collected two years’ worth of video data from camera traps. These reveal that mandrill groups change their travel speed during the day and that the pattern of change differs between the high fruit and low fruit seasons.

During the high fruit season, the daytime movement rate patterns appeared less consistent, whereas the low season showed a flattening or a kind of uniformity in the daytime movement pattern.

Such flexible dietary and ranging behaviors could influence how large groups of mandrills sustain themselves.

“We also find that the groups move exclusively during the daytime,” Hongo observes. Video footage did not show any evidence of night-time movement, suggesting that the mandrills stay up high in the trees to sleep and to avoid predators, such as leopards.

To Hongo and his team, it is gratifying that their direct observation data are consistent with the data from the large-area camera traps. He adds, “We hope to see more multi-method approaches to a single research question and studies of populations of interest incorporating different angles.”

 

###

The paper “Seasonality in daily movement patterns of mandrills revealed by combining direct tracking and camera traps” appeared in the Journal of Mammalogy on 24 May 2021 with doi: 10.1093/jmammal/gyab141

 

About Kyoto University

Kyoto University is one of Japan and Asia’s premier research institutions, founded in 1897 and responsible for producing numerous Nobel laureates and winners of other prestigious international prizes. A broad curriculum across the arts and sciences at both undergraduate and graduate levels is complemented by numerous research centers, as well as facilities and offices around Japan and the world. For more information please see: http://www.kyoto-u.ac.jp/en

 



Journal

Journal of Mammalogy

DOI

10.1093/jmammal/gyab141

Method of Research

Observational study

Subject of Research

Animals

Article Title

Seasonality in daily movement patterns of mandrills revealed by combining direct tracking and camera traps

Article Publication Date

25-Nov-2021

COI Statement

There are no conflicts of interest.

Tags: captureshybridlargermandrillspictureStrategywild
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