March 24, 2014
Ryan Covey with the University of Oregon and W. Scott McGraw with Ohio State University surveyed the Daobly market in the Ivorian town of Taï along the Cavally River, which serves as a natural border between Liberia and Ivory Coast. The slaughter of wild animals within Ivory Coast's forests is outlawed, yet illegal hunting is still prevalent in the country’s Taï National Park despite the park’s status as a World Heritage Site and the presence of a long-term primate research project. The primate research stations provide some protection, as hunters largely avoid hunting in research areas. While law enforcement is currently inadequate for protecting the entire park, restrictions have pushed hunting pressure into neighboring Liberia, specifically the Konobo District of eastern Liberia.
Composing part of the West African Guinea Forest biodiversity hotspot, Konobo's large intact forest is considered a high conservation priority and home to many endangered primate species including the Diana monkey (Cercopithecus diana), West African chimpanzee (Pan troglodytes verus), and western red colobus (Procolobus badius). Wild animals hunted in these forests are imported daily to the Daobly market, attracting customers from across the country including towns from as far away as 354 miles (570 km). The Daobly market—established in 1992—was created in part to alleviate hunting pressure in the Taï National Park, but has pushed hunting across the border.
Top: Olive colobus (left) and Lesser spot-nosed monkey (right) for sale at the Daobly Market. Bottom: Western red colobus for sale at the market. Photos by: Ryan Covey.
Covey and McGraw documented the amount of primate meat traded at the Doably market and used this data to assess the general population status of primates in Liberian forests. They conducted a total of eight surveys on Friday market days in 2009 and 2010. During three hour surveys, they recorded the date, species, and preservation state (smoked or fresh) of all primate carcasses brought into the market via dugout canoe from the Cavally River. Nearly all of the primates brought to the market adults and with help from participants from the Taï Monkey Project, the researchers were able to identify species.
The researchers counted a total of 723 animals including 264 primates that were traded to customers for restaurant or household consumption. The most common of the nine different primate species observed were the lesser spot-nosed monkey (Cercopithecus petaurista), categorized as Least Concern by the IUCN Red List, and the Diana monkey (Cercopithecus diana), considered Vulnerable. With this data, the researchers estimated that approximately 9,464 primates are sold at the Daobly market every year.
To understand how this booming bushmeat market may be impacting primates, the researchers estimated the total primate population in the Konobo forest. In all, they estimated that 342,891 primate individuals lived in the 1,460 square kilometer (563.71 square miles) forest area. According to the researchers, under optimal conditions an area that large would contain a primate population of roughly 428,600 individuals. However, with an annual decrease of over 9,000 primates due to the bushmeat trade in addition to an estimated 20 percent general population reduction over the last few decades, primates in the Konobo District are vanishing at a rate of nearly three percent every year. Moreover, the researchers believe they may be underestimating the decline due to limitations in their research.
"First, there are multiple smaller markets throughout the Konobo District, none of which were surveyed," the researchers write. "Many primates hunted in the district are consumed locally and are not destined for markets in Ivory Coast. Also, because there are multiple points along the Cavally River where bushmeat enters Ivory Coast from Liberia, the carcasses we observed in Daobly market are almost certainly not the only primates from the Konobo District finding their way into Ivory Coast."
Collection of animals for sale including duikers, porcupines, Diana monkey, lesser spot-nosed monkey, and a collection of dried primate and duiker carcasses. Photo by: Ryan Covey.
Still, this study could provide fundamental information for potential primate conservation projects in Liberia where current deforestation rates are relatively low in comparison with Ivory Coast. As deforestation rates due to cocoa and rubber plantations in Ivory Coast continue to rise, Liberian forests could become potentially crucial habitat refugees for wildlife, in particular forest-dwelling primate species. However, in addition to high hunting pressure, Liberia’s forests are facing a rising threat of palm oil plantations.
"Although the preliminary nature of our data preclude us from stating with certainty that any single taxon is being hunted unsustainably, we hope that our market counts might serve as a baseline data for additional surveys in Liberia and Ivory Coast in the near future," the researchers write. "This study highlights the current hunting problem facing primates throughout West Africa."
The researchers recommend multiple actions, including population surveys to determine the abundance and distribution of primates in the region and locate areas of high conservation concern. Secondly, they recommend establishing a monitoring system for markets throughout the Konobo District as well as bordering markets along the Ivory Coast. This information would better inform law enforcement by directing them to the most threatened areas. Lastly, the researchers advocate for local education and involvement by residents in primate research and monitoring projects, giving locals the opportunity to benefit from preservation of their wildlife.
The location of the bushmeat market along the Ivory Coast/Liberia border. Hunting range indicated by yellow, diagonal lines. Map by: Ryan Covey.
- Covey, Ryan, and W. Scott McGraw. “Monkeys in a West African Bushmeat Market: Implications for Cercopithecid Conservation in Eastern Liberia.” Tropical Conservation Science 1st ser. 7 (2014): 115-25. Mongabay.com Open Access Journal. 2014. Web.
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