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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

Significant relationships with time since release and (a) % insect eating; (b)% fruit eating; (c) % seed eating; (d) % time travelling. Each individual is represented as a separate symbol. Females are shown as triangles and males as squares.
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animals-03-00532-f002: Significant relationships with time since release and (a) % insect eating; (b)% fruit eating; (c) % seed eating; (d) % time travelling. Each individual is represented as a separate symbol. Females are shown as triangles and males as squares.

Mentions: When comparing the feeding ecology in the released chimpanzees over time, we found a negative correlation between time since release and fruit consumption (Figure 2, rs = −0.311, p = 0.010, n = 67) but not between fruit consumption and age (r = −0.198, p = 0.108, n = 67). Time since release and insect consumption were also negatively correlated (Figure 2, rs = −0.350, p < 0.004, n = 67) as was age and insect consumption (Figure 3, rs = 0.429, p < 0.001, n = 67). Conversely we found a positive correlation between seed consumption and time since release (Figure 2, rs = 0.567, p < 0.001, n = 67) and with seed consumption and age (Figure 3, rs = 0.544, p < 0.001, n = 67). There were no correlations with leaf consumption and either age (r = −0.139, p = 0.261) or time since release (rs = −0.165, p = 0.182, n = 67), nor with flower consumption and age (r = 0.080, p = 0.519, n = 67) ortime since release (rs = 0.039, p = 0.752, n = 67), nor with meat consumption and age (r = −0.017, p = 0.890, n = 67) or time since release (rs = 0.040, p = 0.749, n = 67).


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)

Significant relationships with time since release and (a) % insect eating; (b)% fruit eating; (c) % seed eating; (d) % time travelling. Each individual is represented as a separate symbol. Females are shown as triangles and males as squares.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

animals-03-00532-f002: Significant relationships with time since release and (a) % insect eating; (b)% fruit eating; (c) % seed eating; (d) % time travelling. Each individual is represented as a separate symbol. Females are shown as triangles and males as squares.
Mentions: When comparing the feeding ecology in the released chimpanzees over time, we found a negative correlation between time since release and fruit consumption (Figure 2, rs = −0.311, p = 0.010, n = 67) but not between fruit consumption and age (r = −0.198, p = 0.108, n = 67). Time since release and insect consumption were also negatively correlated (Figure 2, rs = −0.350, p < 0.004, n = 67) as was age and insect consumption (Figure 3, rs = 0.429, p < 0.001, n = 67). Conversely we found a positive correlation between seed consumption and time since release (Figure 2, rs = 0.567, p < 0.001, n = 67) and with seed consumption and age (Figure 3, rs = 0.544, p < 0.001, n = 67). There were no correlations with leaf consumption and either age (r = −0.139, p = 0.261) or time since release (rs = −0.165, p = 0.182, n = 67), nor with flower consumption and age (r = 0.080, p = 0.519, n = 67) ortime since release (rs = 0.039, p = 0.752, n = 67), nor with meat consumption and age (r = −0.017, p = 0.890, n = 67) or time since release (rs = 0.040, p = 0.749, n = 67).

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