Sapelli (Entandrophragma cylindricum) and tali (Erythrophleum suaveolens) are among the most important timber
species harvested from Congo Basin forests. They also host edible caterpillars, Imbrasia oyemensis and Cirina
forda, respectively, which are important to the nutrition and income of rural and urban populations. This study
evaluated the density of these tree species within a 10 km radius around each of 4 villages and in the 2012
annual cutting areas of two timber concessions in the region of Kisangani (DRC). Sapelli and tali trees
≥20 cm dbh and their stumps were identiﬁed and measured on 21 ﬁve ha plots around each village and 20 ﬁve
ha plots on each concession. Around villages and on concessions, sapelli trees occurred at densities of
0.048 ± 0.008 harvestable trees (≥80 cm dbh) ha −1 and 0.135 ± 0.019 precommercial trees ha −1.
Harvestable tali trees (≥60 cm dbh) were seven times more abundant at 0.347 ± 0.032 ha −1, while pre-
commercial tali trees occurred at densities of 0.329 ± 0.033 trees ha −1. Between 25% and 40% of the har-
vestable sapelli trees had been logged as compared to < 3% of the harvestable tali trees. Production per tree,
derived from another study, was extrapolated to estimate caterpillar yields on a half circle of 15,700 ha within
10 km of villages, using these estimates of tree densities. Depending on the village, yields were estimated as
11.6–34.5 Mg year −1 of I. oyemensis from sapelli trees, and 65.8–80.9 Mg year −1 of C. forda from tali trees, an
average of 0.74–2.2 kg ha −1 year and 4.2–5.2 kg ha −1 year, fresh weight, respectively (0.23–0.68 kg ha −1
year −1 and 1.3–1.6 kg ha −1 year −1, dry weight, respectively). Harvestable trees yielded
more caterpillars, providing most of the C. forda caterpillars. However, because harvestable sapelli trees oc-
curred at low densities, the bulk of I. oyemensis caterpillar production would be hosted on precommercial trees.
Logging practices that reject poorly formed or hollow trees and guidelines that call for high minimum diameter
limits and retention of seed trees or prohibit logging on slopes or riparian zones, safeguard edible caterpillar
production. Multiple resource management for multiple stakeholders would require more deliberate planning
and management approaches based on negotiations with local communities and approaches like setting aside
collection zones or collection trees that would be protected from logging.
Auteurs et éditeurs
Bioversity International is a global research-for-development organization. We have a vision – that agricultural biodiversity nourishes people and sustains the planet.
We deliver scientific evidence, management practices and policy options to use and safeguard agricultural and tree biodiversity to attain sustainable global food and nutrition security.
We work with partners in low-income countries in different regions where agricultural and tree biodiversity can contribute to improved nutrition, resilience, productivity and climate change adaptation.
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CGIAR is the only worldwide partnership addressing agricultural research for development, whose work contributes to the global effort to tackle poverty, hunger and major nutrition imbalances, and environmental degradation.