Seed dispersal by Ceratogymna hornbills in the Dja Reserve, Cameroon

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Item Metadata Smith, Thomas B.
Parker, V. Thomas
Hardesty, Britta Denise
Stauffer, Donald J.
Holbrook, Kimberly M.
Lamperti, Aaron M.
Fogiel, Mark K.
Whitney, Kenneth D. 2008-09-11T14:50:36Z 2008-09-11T14:50:36Z 1998-05
dc.description.abstract Seed dispersal is a process critical to the maintenance of tropical forests, yet little is known about the interactions of most dispersers with their communities. In the Dja Reserve, Cameroon, seed dispersal by the hornbills Ceratogymna atrata, C. cylindricus and C. fistulator (Aves: Bucerotidae) was evaluated with respect to the taxonomic breadth of plants dispersed, location of seed deposition and effects on seed germination. Collectively, the three hornbill species consumed fruits from 59 tree and liana species, and likely provided dispersal for 56 of them. Hornbill-dispersed tree species composed 22% of the known tree flora of the site. Hornbill visit lengths, visit frequencies, and seed passage times indicated that few seeds were deposited beneath parent trees; in five hornbill/tree species pairings studied, 69–100% of the seeds ingested were deposited away from the parent trees. Germination trials showed that hornbill gut passage is gentle on seeds. Of 24 tree species tested, 23 germinated after passage by hornbills; of 17 planted with controls taken directly from trees, only four species showed evidence of inhibition of germination rate, while seven experienced unchanged germination rates and six experienced enhanced germination rates. Results suggested that Ceratogymna hornbills rank among the most important seed dispersers found in Afrotropical forests, and they deserve increased conservation attention. Ceratogymna hornbills are likely to become increasingly important in forest regeneration as populations of larger mammalian seed dispersers (such as forest elephants and primates) diminish.
dc.description.sponsorship NYZS/The Wildlife Conservation Society, the National Science Foundation Graduate Fellowship Program, the GAANN Program of San Francisco State University, and ECOFAC Cameroun
dc.language.iso eng
dc.publisher Cambridge University Press
dc.subject seed passage
seed germination
seed dispersal
seed deposition
rain forest
dc.title Seed dispersal by Ceratogymna hornbills in the Dja Reserve, Cameroon
dc.type Journal article
dc.type.dcmi Text
dc.identifier.citation Smith, Thomas B., Parker, V. Thomas, Hardesty, Britta Denise, Stauffer, Donald J., Holbrook, Kimberly M., Lamperti, Aaron M., Fogiel, Mark K. and Whitney, Kenneth D.. (1998). "Seed dispersal by Ceratogymna hornbills in the Dja Reserve, Cameroon."

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