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Genetics as a conservation tool for endangered chimpanzees

Genetics as conservation tool for endangered chimpanzees
Effective migration and diversity surfaces show areas with effective migration and diversity rates higher or lower than the overall average rate across all samples, where blue shades indicate higher rates than the average and brown shades indicate lower rates than the average. Dotted lines indicate assumed boundaries between communities following prior knowledge from field observations and topology (mountain ridges are here shaded in light colors surrounded by green forest cover). (a) Effective migration rate surfaces, m, characterizing genetic dissimilarities between distinct demes. (b) Effective diversity dissimilarities rates, (q), between distinct individuals within the same deme. Credit: Conservation Science and Practice (2023). DOI: 10.1111/csp2.12898

The western chimpanzees of Guinea are threatened by mining activities. Using a novel genetic approach, UZH researchers and an international team have collected information on population size and community structure of the endangered species. These data provide an important baseline to assess the impact of mining.

The western chimpanzee is listed as "Critically Endangered" on the Red List of the International Union for the Conservation of Nature. The Mount Nimba Strict Nature Reserve, a UNESCO World Heritage site, located on the borders of Guinea, Liberia and Côte d'Ivoire in West Africa, harbors a unique population of this subspecies.

However, this region is now under threat from mining activities immediately abutting its borders. Guinea is rich in minerals with some of the highest‐grade iron‐ore deposits in the world. "It is therefore crucial to establish tools to monitor this endangered chimpanzee population and assess the potential impact of mining," says Kathelijne Koops, professor in the Department of Evolutionary Anthropology at the University of Zurich.

Fecal samples collected over 15 years

To this end, Koops and her colleagues used genetic censusing to estimate chimpanzee , community composition and range boundaries on the western flank of the massif in Guinea. The international team included researchers from the University of Zurich, the University of Kent, Copenhagen Zoo, the University of Copenhagen, Texas A&M and the Environmental Research Institute of Bossou in Guinea.

Chimpanzees in Mount Nimba Strict Nature Reserve. Credit: Maegan Fitzgerald and Kathelijne Koops

"Our study is the first to employ genetics on such a large scale to estimate the number and population structure of a critically endangered chimpanzee population in West Africa," says Koops. During the researchers collected almost a thousand of chimpanzees between 2003 and 2018. They analyzed the contained in these samples using a panel of 26 microsatellites—short pieces of DNA that allow the identification of individual animals as well as relatedness between them.

Genes reveal family ties and migration

The analysis identified a total of 136 chimpanzees living in four different communities or social groups. The actual number of chimpanzees in the area probably significantly exceeds this minimum estimate. "Infants and juveniles are not reliably included in fecal sampling and some areas of the mountain range remain under-sampled," says Dr. Christina Hvilsom, conservation geneticist at Copenhagen Zoo.

The team also found a number of migratory events, as well as high levels of shared ancestry and . "These findings highlight the utility of genetic censusing for temporal monitoring of ape abundance, as well as capturing migratory events and gauging genetic diversity and population viability over time," adds co-author Dr. Peter Frandsen, also at Copenhagen Zoo.

For example, the data allow predictions to be made as to how road building and extraction activities might affect chimpanzee movement between the different communities or reduce access to food and nesting sites.

New tool for protection of great apes

"This study undeniably confirms the status of the Nimba UNESCO World Heritage Site as a priority site for the conservation of the critically endangered western chimpanzee," says co-author Dr. Tatyana Humle, senior associate at Re:wild. "It also demonstrates the value of employing non-invasive genetic techniques to generate critical data on population abundance, structure and genetic health."

"For future impact assessments, we recommend genetic sampling, combined with camera trapping, as these methods can provide robust baselines for biomonitoring and conservation management," says Koops. Not only for the western chimpanzee but also for other species of endangered great apes.

The study is published in the journal Conservation Science and Practice.

More information: Genetics as a novel tool in mining impact assessment and biomonitoring of critically endangered western chimpanzees in the Nimba Mountains, Guinea., Conservation Science and Practice (2023). DOI: 10.1111/csp2.12898

Citation: Genetics as a conservation tool for endangered chimpanzees (2023, March 16) retrieved 25 June 2024 from
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