Permanent URL to this publication: http://dx.doi.org/10.5167/uzh-63245
Zuël, Nicolas; Griffiths, Christine J; Hector, Andy; Hansen, Dennis M; Jones, Carl G; Albrecht, Matthias (2012). Ingestion by an endemic frugivore enhances seed germination of endemic plant species but decreases seedling survival of exotics. Journal of Biogeography, 39(11):2021-2030.
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Aim To test whether ingestion by endemic frugivores differentially affects the seed germination time, germination percentage and seedling survival of endemic, native and exotic fleshy fruited plant species, and to identify the principal processes and attributes driving such effects. Location Round Island, Mauritius. Methods We conducted a germination and seedling survival experiment for 3 months to test whether ingestion (gut passage and deposition in faeces) by the endemic Telfair’s skink (Leiolopisma telfairii) had a differential effect on the germination time, germination percentage and seedling survival of two endemic, four native and two exotic fleshy fruited plant species. To assess the importance of factors involved in the ingestion process, we used a factorial design with gut passage (gut-passed vs. not gut-passed), depulping (whole fruit vs. manually depulped seed) and the presence of faecal material (faeces vs. without faeces). In addition, the roles of species-specific traits, seed size and deposition density (average number of seeds per faeces) were examined. Results Exotic species had a higher germination percentage than indigenous (native and endemic) species when not ingested. Following skink ingestion, there was no longer a difference, as ingestion enhanced germination percentage most in endemic species. The exotic species still germinated faster overall than the indigenous species, despite ingestion accelerating the germination time of endemics. However, ingestion strongly reduced seedling survival of the exotic species, while having no negative effect on the survival of indigenous seedlings. Overall, ingested indigenous seeds were more likely to germinate and the seedlings more likely to survive than ingested exotic seeds and seedlings. Seed size, deposition density and the removal of fruit pulp by either manual depulping or gut passage were important predictors of germination time, germination percentage and seedling survival. Main conclusions These endemic frugivores can enhance the competitiveness of endemic compared with exotic fleshy fruited plants at the critical germination and seedling establishment stage. Consequently, conservation and restoration of mutualistic endemic plant–animal interactions may be vital to mitigating the degradation of habitats invaded by exotic plants, which is of particular relevance for island ecosystems in which large numbers of endemics are threatened by exotic invaders.
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|Item Type:||Journal Article, refereed, original work|
|Communities & Collections:||07 Faculty of Science > Institute of Evolutionary Biology and Environmental Studies|
|DDC:||570 Life sciences; biology
590 Animals (Zoology)
|Uncontrolled Keywords:||Alien plant species, ecosystem functioning, frugivory, gut passage, island invasion, lizard, Leiolopisma, telfairii, Mauritius, plant–animal interactions, seed germination.|
|Deposited On:||10 Jul 2012 08:59|
|Last Modified:||22 Oct 2014 11:15|
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