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A Longitudinal Study on Feeding Behaviour and Activity Patterns of Released Chimpanzees in Conkouati-Douli National Park, Republic of Congo.

Renaud A, Jamart A, Goossens B, Ross C - Animals (Basel) (2013)

Bottom Line: HELP Congo was the first project to successfully release wild-born orphan chimpanzees into an existing chimpanzee habitat.Furthermore, we found a decline in time spent travelling, but an increase in time spent on social activities, such as grooming, as individuals matured.In conclusion, the observed changes in feeding and activity patterns seem to reflect important long-term behavioural and ecological adaptations in wild-born orphan released chimpanzees, demonstrating that the release of chimpanzees can be successful, even if it takes time for full adaptation.

View Article: PubMed Central - PubMed

Affiliation: HELP Congo (Habitat Ecologique et Liberté des Primates), BP 335, Pointe Noire, Congo. amandernd@gmail.com.

ABSTRACT
Wild chimpanzee populations are still declining due to logging, disease transmission and hunting. The bushmeat trade frequently leads to an increase in the number of orphaned primates. HELP Congo was the first project to successfully release wild-born orphan chimpanzees into an existing chimpanzee habitat. A collection of post monitoring data over 16 years now offers the unique opportunity to investigate possible behavioural adaptations in these chimpanzees. We investigated the feeding and activity patterns in eight individuals via focal observation techniques from 1997-1999 and 2001-2005. Our results revealed a decline in the number of fruit and insect species in the diet of released chimpanzees over the years, whereas within the same period of time, the number of consumed seed species increased. Furthermore, we found a decline in time spent travelling, but an increase in time spent on social activities, such as grooming, as individuals matured. In conclusion, the observed changes in feeding and activity patterns seem to reflect important long-term behavioural and ecological adaptations in wild-born orphan released chimpanzees, demonstrating that the release of chimpanzees can be successful, even if it takes time for full adaptation.

No MeSH data available.


Related in: MedlinePlus

Map of the release site Triangle within the sanctuary of HELP Congo (the release site so called the “Triangle” of 22 km² area, is composed of three sites, the Triangle forest, the Man Faï Taï forest and the Reserve. Chimpanzees are free ranging, using natural bridges to cross the rivers).
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animals-03-00532-f001: Map of the release site Triangle within the sanctuary of HELP Congo (the release site so called the “Triangle” of 22 km² area, is composed of three sites, the Triangle forest, the Man Faï Taï forest and the Reserve. Chimpanzees are free ranging, using natural bridges to cross the rivers).

Mentions: The study site, the “Triangle”, is located in the North of the Conkouati lagoon in the Conkouati-Douli National Park (3°33'–4°02'S; 11°10'–11°40'E), Republic of Congo (Figure 1). The “Triangle” has an area of 22 km², and was chosen in 1996 by HELP Congo to be the release site of wild-born orphan chimpanzees due to its abundance of food, especially fruits, its low population density of wild chimpanzees (0.17–0.33 individuals/km2), and absence of people [12,14,20]. The rainy season is concentrated from October to May and there is a dry season from June to September [21].


A Longitudinal Study on Feeding Behaviour and Activity Patterns of Released Chimpanzees in Conkouati-Douli National Park, Republic of Congo.

Renaud A, Jamart A, Goossens B, Ross C - Animals (Basel) (2013)

Map of the release site Triangle within the sanctuary of HELP Congo (the release site so called the “Triangle” of 22 km² area, is composed of three sites, the Triangle forest, the Man Faï Taï forest and the Reserve. Chimpanzees are free ranging, using natural bridges to cross the rivers).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4494399&req=5

animals-03-00532-f001: Map of the release site Triangle within the sanctuary of HELP Congo (the release site so called the “Triangle” of 22 km² area, is composed of three sites, the Triangle forest, the Man Faï Taï forest and the Reserve. Chimpanzees are free ranging, using natural bridges to cross the rivers).
Mentions: The study site, the “Triangle”, is located in the North of the Conkouati lagoon in the Conkouati-Douli National Park (3°33'–4°02'S; 11°10'–11°40'E), Republic of Congo (Figure 1). The “Triangle” has an area of 22 km², and was chosen in 1996 by HELP Congo to be the release site of wild-born orphan chimpanzees due to its abundance of food, especially fruits, its low population density of wild chimpanzees (0.17–0.33 individuals/km2), and absence of people [12,14,20]. The rainy season is concentrated from October to May and there is a dry season from June to September [21].

Bottom Line: HELP Congo was the first project to successfully release wild-born orphan chimpanzees into an existing chimpanzee habitat.Furthermore, we found a decline in time spent travelling, but an increase in time spent on social activities, such as grooming, as individuals matured.In conclusion, the observed changes in feeding and activity patterns seem to reflect important long-term behavioural and ecological adaptations in wild-born orphan released chimpanzees, demonstrating that the release of chimpanzees can be successful, even if it takes time for full adaptation.

View Article: PubMed Central - PubMed

Affiliation: HELP Congo (Habitat Ecologique et Liberté des Primates), BP 335, Pointe Noire, Congo. amandernd@gmail.com.

ABSTRACT
Wild chimpanzee populations are still declining due to logging, disease transmission and hunting. The bushmeat trade frequently leads to an increase in the number of orphaned primates. HELP Congo was the first project to successfully release wild-born orphan chimpanzees into an existing chimpanzee habitat. A collection of post monitoring data over 16 years now offers the unique opportunity to investigate possible behavioural adaptations in these chimpanzees. We investigated the feeding and activity patterns in eight individuals via focal observation techniques from 1997-1999 and 2001-2005. Our results revealed a decline in the number of fruit and insect species in the diet of released chimpanzees over the years, whereas within the same period of time, the number of consumed seed species increased. Furthermore, we found a decline in time spent travelling, but an increase in time spent on social activities, such as grooming, as individuals matured. In conclusion, the observed changes in feeding and activity patterns seem to reflect important long-term behavioural and ecological adaptations in wild-born orphan released chimpanzees, demonstrating that the release of chimpanzees can be successful, even if it takes time for full adaptation.

No MeSH data available.


Related in: MedlinePlus