Exploring mechanisms and origins of reduced dispersal in island Komodo dragons
| Autor: | Tim S. Jessop, David M. Forsyth, Jeri Imansyah, Deni Purwandana, Raoul A. Mulder, Achmad Ariefiandy, Benjamin L. Phillips, Yunias Jackson Benu, Damien A. Fordham, Claudio Ciofi |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Male
0106 biological sciences 0301 basic medicine 010603 evolutionary biology 01 natural sciences General Biochemistry Genetics and Molecular Biology Intraspecific competition Mark and recapture 03 medical and health sciences biology.animal Animals Selection Genetic Ecosystem General Environmental Science Islands Natural selection Ecology General Immunology and Microbiology biology Lizard Niche differentiation Lizards General Medicine 030104 developmental biology Komodo dragon Biological dispersal Philopatry General Agricultural and Biological Sciences Animal Distribution |
| Zdroj: | Proceedings of the Royal Society B: Biological Sciences. 285:20181829 |
| ISSN: | 1471-2954 0962-8452 |
| DOI: | 10.1098/rspb.2018.1829 |
| Popis: | Loss of dispersal typifies island biotas, but the selective processes driving this phenomenon remain contentious. This is because selection via, both indirect (e.g. relaxed selection or island syndromes) and direct (e.g. natural selection or spatial sorting) processes may be involved, and no study has yet convincingly distinguished between these alternatives. Here, we combined observational and experimental analyses of an island lizard, the Komodo dragon (Varanus komodoensis, the world's largest lizard), to provide evidence for the actions of multiple processes that could contribute to island dispersal loss. In the Komodo dragon, concordant results from telemetry, simulations, experimental translocations, mark-recapture, and gene flow studies indicated that despite impressive physical and sensory capabilities for long-distance movement, Komodo dragons exhibited near complete dispersal restriction: individuals rarely moved beyond the valleys they were born/captured in. Importantly, lizard site-fidelity was insensitive to common agents of dispersal evolution (i.e. indices of risk for inbreeding, kin and intraspecific competition, and low habitat quality) that consequently reduced survival of resident individuals. We suggest that direct selection restricts movement capacity (e.g. via benefits of spatial philopatry and increased costs of dispersal) alongside use of dispersal-compensating traits (e.g. intraspecific niche partitioning) to constrain dispersal in island species. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|