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Quantity and spatial distribution of seeds dispersed by a western lowland gorilla population in south-east Cameroon

Published online by Cambridge University Press:  02 March 2015

Charles-Albert Petre ,
Nikki Tagg ,
Roseline Beudels-Jamar ,
Barbara Haurez ,
Marcel Salah ,
Victoria Spetschinsky ,
Jacob Willie  and
Jean-Louis Doucet
Charles-Albert Petre*
Affiliation:
Foresterie Tropicale, Gestion des Ressources Forestières, Département BIOSE, Gembloux Agro-Bio Tech, University of Liège, 2 Passage des Déportés, 5030 Gembloux, Belgium Conservation Biology Unit, Royal Belgian Institute of Natural Sciences, 29 Rue Vautier, 1000 Brussels, Belgium Projet Grands Singes Cameroon, Centre for Research and Conservation, Royal Zoological Society of Antwerp, 20–26 Koningin Astridplein, 2018 Antwerp, Belgium
Nikki Tagg
Affiliation:
Projet Grands Singes Cameroon, Centre for Research and Conservation, Royal Zoological Society of Antwerp, 20–26 Koningin Astridplein, 2018 Antwerp, Belgium
Roseline Beudels-Jamar
Affiliation:
Conservation Biology Unit, Royal Belgian Institute of Natural Sciences, 29 Rue Vautier, 1000 Brussels, Belgium
Barbara Haurez
Affiliation:
Foresterie Tropicale, Gestion des Ressources Forestières, Département BIOSE, Gembloux Agro-Bio Tech, University of Liège, 2 Passage des Déportés, 5030 Gembloux, Belgium École Régionale Post-Universitaire d’Aménagement et de Gestion Intégrés des Forêts et Territoires Tropicaux (ERAIFT), B.P. 15373 Kinshasa, Democratic Republic of Congo
Marcel Salah
Affiliation:
Projet Grands Singes Cameroon, Centre for Research and Conservation, Royal Zoological Society of Antwerp, 20–26 Koningin Astridplein, 2018 Antwerp, Belgium Ministry of Forestry and Wildlife, Boulevard du 20 mai, 34430 Yaoundé, Cameroon
Victoria Spetschinsky
Affiliation:
Foresterie Tropicale, Gestion des Ressources Forestières, Département BIOSE, Gembloux Agro-Bio Tech, University of Liège, 2 Passage des Déportés, 5030 Gembloux, Belgium
Jacob Willie
Affiliation:
Projet Grands Singes Cameroon, Centre for Research and Conservation, Royal Zoological Society of Antwerp, 20–26 Koningin Astridplein, 2018 Antwerp, Belgium
Jean-Louis Doucet
Affiliation:
Foresterie Tropicale, Gestion des Ressources Forestières, Département BIOSE, Gembloux Agro-Bio Tech, University of Liège, 2 Passage des Déportés, 5030 Gembloux, Belgium École Régionale Post-Universitaire d’Aménagement et de Gestion Intégrés des Forêts et Territoires Tropicaux (ERAIFT), B.P. 15373 Kinshasa, Democratic Republic of Congo
*
1Corresponding author. Email: capetre@doct.ulg.ac.be
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Abstract:

Understanding the ecological function of large frugivores in tropical forests is important considering their central position in seed-dispersal networks. This study illustrates the seed-dispersal effectiveness of a western lowland gorilla (Gorilla gorilla gorilla) population in Cameroon by looking at the interaction of seed quantity, species regeneration traits and the environmental characteristics of the deposition sites (sleeping sites vs. feeding trails) in order to discuss the role of gorillas within the ecosystem. The analysis of 1030 faecal samples collected over a 3-y period (September 2009–August 2012) showed that gorillas dispersed a diverse array of species (58 spp. identified), with an average of 289 intact seeds (>5 mm) d−1 per individual. Seed damage during mouth and gut processing occurred for 12 spp., generally accounting for <5% of specific seed load. Germination trials suggested that germination success of passed seeds remained unchanged (N = 6 spp.) or improved (N = 5 spp.) after gut passage compared with hand-cleaned seeds, with one exception. Indicator species identification (IndVal method) and General Discriminant Analysis suggested that sleeping sites (N = 36), as a main type of seed deposition site, correspond to regenerating microhabitats and correspondingly degree of canopy openness is one variable discriminating significantly this type of deposition site with random locations in the forest (N = 36) used as a proxy for non-directed seed deposition on feeding trails. With a mean canopy openness of 19–27%, sleeping sites offer optimal light conditions for the seedling recruitment of non-pioneer light-demanding species, the seeds of which encompass 47.4% of the total seed load dispersed over the 3-y period. From this study, it is hypothesized that the gorilla performed directed-dispersal of some light-demanding plant species at sleeping sites, and hence, by being actively implicated in gap-phase dynamics, fulfils a valuable ecological function within its ecosystem.

Keywords

deposition site suitabilityforest dynamicsGorilla gorilla gorillalarge seedsseed dispersal effectivenessshade tolerance
Type
Research Article
Information
Journal of Tropical Ecology , Volume 31 , Issue 3 , May 2015 , pp. 201 - 212
Copyright
Copyright © Cambridge University Press 2015 

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References

LITERATURE CITED

AGYEMAN, V., SWAINE, M. & THOMPSON, J. 1999. Responses of tropical forest tree seedlings to irradiance and the derivation of a light response index. Journal of Ecology 87:815–827.Google Scholar
BABWETEERA, F. 2012. Seed dispersal and tree spatial recruitment patterns in secondary tropical rain forests. Pp. 157–176 in Sudarshana, P., Nageswara-Rao, M. & Soneji, J. R. (eds.). Tropical Forests. InTech.Google Scholar
CALVIÑO-CANCELA, M. & MARTÍN-HERRERO, J. 2009. Effectiveness of a varied assemblage of seed dispersers of a fleshy-fruited plant. Ecology 90:3503–3515.Google Scholar
CIPOLLETTA, C. 2003. Ranging patterns of a western gorilla group during habituation to humans in the Dzanga-Ndoki National Park, Central African Republic. International Journal of Primatology 24:1207–1226.Google Scholar
DORAN, D. M., MCNEILAGE, A., GREER, D., BOCIAN, C., MEHLMAN, P. & SHAH, N. 2002. Western lowland gorilla diet and resource availability: new evidence, cross-site comparisons, and reflections on indirect sampling methods. American Journal of Primatology 58:91–116.Google Scholar
DORAN-SHEEHY, D. M., GREER, D., MONGO, P. & SCHWINDT, D. 2004. Impact of ecological and social factors on ranging in western gorillas. American Journal of Primatology 64:207–222.CrossRefGoogle ScholarPubMed
DUFRÊNE, M. & LEGENDRE, P. 1997. Species assemblages and indicator species: the need for a flexible asymmetrical approach. Ecological Monographs 67:345–366.Google Scholar
FORGET, P.-M., DENNIS, A. J., MAZER, S. J., JANSEN, P. A., KITAMURA, S., LAMBERT, J. E. & WESTCOTT, D. A. 2007. Seed allometry and disperser assemblages in tropical rainforests: a comparison of four floras on different continents. Pp. 5–36 in Dennis, A. J., Schupp, E. W., Green, R. A. & Wescott, D. A. (eds.). Seed dispersal: theory and its application in a changing world. CAB International, Wallingford.Google Scholar
GAUTIER-HION, A. G., DUPLANTIER, J.-M., QURIS, R., FEER, F., SOURD, C., DECOUX, J.-P., DUBOST, G., EMMONS, L., ERARD, C., HECKETSWEILER, P., MOUNGAZI, A., ROUSSILHON, C. & THIOLLAY, J.-M. 1985. Fruit characters as a basis of fruit choice and seed dispersal in a tropical forest vertebrate community. Oecologia 65:324–337.Google Scholar
HAWTHORNE, W. D. 1995. Ecological profiles of Ghanaian forest trees. Tropical forestry papers 29. Oxford Forestry Institute, Oxford. 345 pp.Google Scholar
HEAD, J. S., BOESCH, C., MAKAGA, L. & ROBBINS, M. M. 2011. Sympatric chimpanzees (Pan troglodytes troglodytes) and gorillas (Gorilla gorilla gorilla) in Loango National Park, Gabon: dietary composition, seasonality, and intersite comparisons. International Journal of Primatology 32:755–775.Google Scholar
HOLL, K. D. & LULOW, M. E. 1997. Effects of species, habitat, and distance from edge on post‐dispersal seed predation in a tropical rainforest. Biotropica 29:459–468.Google Scholar
HOWE, H. F. & SMALLWOOD, J. 1982. Ecology of seed dispersal. Annual Review of Ecology and Systematics 13:201–228.Google Scholar
IWATA, Y. & ANDO, C. 2006. Bed and bed-site reuse by western lowland gorillas (Gorilla g. gorilla) in Moukalaba-Doudou National Park, Gabon. Primates 48:77–80.Google Scholar
LETOUZEY, R. 1968. Etude phytogéographique du Cameroun. Editions Paul Lechevalier, Paris. 508 pp.Google Scholar
MEHLMAN, P. T. & DORAN, D. M. 2002. Influencing western gorilla nest construction at Mondika Research Center. International Journal of Primatology 23:1257–1285.Google Scholar
NCHANJI, A. C. & PLUMPTRE, A. J. 2003. Seed germination and early seedling establishment of some elephant-dispersed species in Banyang-Mbo Wildlife Sanctuary, south-western Cameroon. Journal of Tropical Ecology 19:229–237.Google Scholar
NISHIHARA, T. 1995. Feeding ecology of western lowland gorillas in the Nouabale-Ndoki National Park, Congo. Primates 36:151–168.Google Scholar
NORDEN, N., CHAVE, J., BELBENOIT, P., CAUBÈRE, A., CHÂTELET, P., FORGET, P.-M., RIÉRA, B., VIERS, J. & THÉBAUD, C. 2009. Interspecific variation in seedling responses to seed limitation and habitat conditions for 14 Neotropical woody species. Journal of Ecology 97:186–197.Google Scholar
PAINE, C. E. T. & HARMS, K. E. 2009. Quantifying the effects of seed arrival and environmental conditions on tropical seedling community structure. Oecologia 160:139–150.Google Scholar
PETRE, C.-A., TAGG, N., HAUREZ, B., BEUDELS-JAMAR, R., HUYNEN, M.-C. & DOUCET, J.-L. 2013. Role of the western lowland gorilla (Gorilla gorilla gorilla) in seed dispersal in tropical forests and implications of its decline. Biotechnology, Agronomy, Society and Environnement 17:517–526.Google Scholar
PETRE, C.-A., ZINQUE, M.-H., TAGG, N., BEUDELS-JAMAR, R.-C., HAUREZ, B., JOSSO, J.-F., MORETTO, P. & DOUCET, J.-L. 2015. Differences in dung beetle activity at western gorilla defecation sites in south-east Cameroon: implications for establishment of Uapaca spp. seedlings. Journal of Tropical Ecology 31:165–174.Google Scholar
POULSEN, J. R., CLARK, C. J. & SMITH, T. B. 2001. Seed dispersal by a diurnal primate community in the Dja Reserve, Cameroon. Journal of Tropical Ecology 17:787–808.Google Scholar
REMIS, M. J. 1997. Ranging and grouping patterns of a western lowland gorilla group at Bai Hokou, Central African Republic. American Journal of Primatology 43:111–133.Google Scholar
ROBERTSON, A. W., TRASS, A., LADLEY, J. J. & KELLY, D. 2006. Assessing the benefits of frugivory for seed germination: the importance of the deinhibition effect. Functional Ecology 20:58–66.Google Scholar
ROGERS, M. E., VOYSEY, B. C., MCDONALD, K. E., PARNELL, R. J. & TUTIN, C. E. G. 1998. Lowland gorillas and seed dispersal: the importance of nest sites. American Journal of Primatology 45:45–68.Google Scholar
SAMUELS, I. A. & LEVEY, D. J. 2005. Effects of gut passage on seed germination: do experiments answer the questions they ask? Functional Ecology 19:365–368.Google Scholar
SCHUPP, E. W. 1995. Seed-seedling conflicts, habitat choice, and patterns of plant recruitment. American Journal of Botany 82:399–409.Google Scholar
SCHUPP, E. W., JORDANO, P. & GÓMEZ, J. M. 2010. Seed dispersal effectiveness revisited: a conceptual review. New Phytologist 188:333–353.Google Scholar
TODD, A. F., KUEHL, H. S., CIPOLLETTA, C. & WALSH, P. D. 2008. Using dung to estimate gorilla density: modeling dung production rate. International Journal of Primatology 29:549–563.Google Scholar
TRAVESET, A. 1998. Effect of seed passage through vertebrate frugivores’ guts on germination: a review. Perspectives in Plant Ecology, Evolution and Systematics 1:151–190.Google Scholar
TUTIN, C. E. G. & FERNANDEZ, M. 1994. Comparison of food processing by sympatric apes in the Lope Reserve, Gabon. Pp. 29–36 in Thierry, B., Anderson, J. R., Roeder, J. J. & Herrenschmidt, N. (eds.). Current primatology. Université Louis Pasteur, Strasbourg.Google Scholar
TUTIN, C. E. G., WILLIAMSON, E. A., ROGERS, M. E. & FERNANDEZ, M. 1991. A case study of a plant–animal relationship: Cola lizae and lowland gorillas in the Lope Reserve, Gabon. Journal of Tropical Ecology 7:181–199.Google Scholar
TUTIN, C. E. G., PARNELL, R. J., WHITE, L. J. T. & FERNANDEZ, M. 1995. Nest building by lowland gorillas in the Lope Reserve, Gabon: environmental influences and implications for censusing. International Journal of Primatology 16:53–76.Google Scholar
VEENENDAAL, E. M., SWAINE, M. D., LECHA, R. T., WALSH, M. T., ABERBRESE, I. K. & OWUSU-AFRIYIE, K. 1996. Responses of West African forest tree seedlings to irradiance and soil fertility. Functional Ecology 10:501–511.Google Scholar
VIDAL, M. M., PIRES, M. M. & GUIMARÃES, P. R. 2013. Large vertebrates as the missing components of seed-dispersal networks. Biological Conservation 163:42–48.Google Scholar
VOYSEY, B. C., MCDONALD, K. E., ROGERS, M. E., TUTIN, C. E. & PARNELL, R. J. 1999a. Gorillas and seed dispersal in the Lope Reserve, Gabon. I: Gorilla acquisition by trees. Journal of Tropical Ecology 15:23–38.Google Scholar
VOYSEY, B. C., MCDONALD, K. E., ROGERS, M. E., TUTIN, C. E. & PARNELL, R. J. 1999b. Gorillas and seed dispersal in the Lope Reserve, Gabon. II: survival and growth of seedlings. Journal of Tropical Ecology 15:39–60.Google Scholar
WENNY, D. G. 2001. Advantages of seed dispersal: a re-evaluation of directed dispersal. Evolutionary Ecology Research 3:51– 74.Google Scholar
WENNY, D. G. & LEVEY, D. J. 1998. Directed seed dispersal by bellbirds in a tropical cloud forest. Proceedings of the National Academy of Sciences USA 95:6204–6207.Google Scholar
WILLIAMSON, E. A. 1988. Behavioural ecology of western lowland gorillas in Gabon. Ph.D dissertation, University of Stirling, Stirling, UK. 137 pp.Google Scholar
WILLIE, J., PETRE, C.-A., TAGG, N. & LENS, L. 2012. Density of herbaceous plants and distribution of western gorillas in different habitat types in south-east Cameroon. African Journal of Ecology 51:111–121.Google Scholar
WILLIE, J., TAGG, N., PETRE, C.-A., PEREBOOM, Z. & LENS, L. 2014. Plant selection for nest building by western lowland gorillas in Cameroon. Primates 55:41–49.CrossRefGoogle ScholarPubMed