Present address: Department of Plant Biology, Southern Illinois University, Carbondale, IL 62901-6509, USA
Traits of recalcitrant seeds in a semi-deciduous tropical forest in Panamá: some ecological implications
Article first published online: 27 SEP 2005
Volume 19, Issue 5, pages 874–885, October 2005
How to Cite
DAWS, M. I., GARWOOD, N. C. and PRITCHARD, H. W. (2005), Traits of recalcitrant seeds in a semi-deciduous tropical forest in Panamá: some ecological implications. Functional Ecology, 19: 874–885. doi: 10.1111/j.1365-2435.2005.01034.x
- Issue published online: 10 OCT 2005
- Article first published online: 27 SEP 2005
- Received 24 February 2005; revised 4 June 2005; accepted 7 June 2005
- Barro Colorado Island;
- recalcitrant seed;
- seed mass
- 1We used cross-species and phylogenetic analyses to compare seed traits of 36 species with desiccation-sensitive and 189 with desiccation-tolerant seeds from a semi-deciduous forest in Panamá.
- 2When correcting for phylogenetic dependence between taxa, the desiccation-sensitive seeds were significantly larger than desiccation-tolerant seeds (3383 vs 283 mg) and typically shed during the wet (as opposed to dry) season. Both traits presumably reduce the rate of seed drying and hence the risk of desiccation-induced mortality for the desiccation-sensitive species.
- 3Growing-house germination trials in simulated understorey and canopy gap environments revealed that the desiccation-sensitive species germinated most rapidly. Additionally, on a proportion basis, the desiccation-sensitive seeds allocated significantly less resources to seed physical defences (endocarp and/or testa) which may partially facilitate rapid germination. Both relationships were significant when correcting for phylogenetic dependence and seed mass.
- 4Our results suggest that, for large-seeded species which will dry slowly, desiccation sensitivity may be advantageous. Rapid germination may reduce the duration of seed exposure to predation, and the low investment in physical defence means that, per unit mass, desiccation-sensitive seeds are a more efficient use of resources in seed provisioning.