| Autor: |
Noreen AM; Department of Biological Sciences, National University of Singapore, Singapore., Niissalo MA; Department of Biological Sciences, National University of Singapore, Singapore., Lum SK; National Institute of Education Singapore, Singapore., Webb EL; Department of Biological Sciences, National University of Singapore, Singapore. |
| Jazyk: |
angličtina |
| Zdroj: |
Heredity [Heredity (Edinb)] 2016 Dec; Vol. 117 (6), pp. 472-480. Date of Electronic Publication: 2016 Oct 05. |
| DOI: |
10.1038/hdy.2016.64 |
| Abstrakt: |
As deforestation and urbanization continue at rapid rates in tropical regions, urban forest patches are essential repositories of biodiversity. However, almost nothing is known about gene flow of forest-dependent tree species in urban landscapes. In this study, we investigated gene flow in the insect-pollinated, wind-dispersed tropical tree Koompassia malaccensis in and among three remnant forest patches in the urbanized landscape of Singapore. We genotyped the vast majority of adults (N=179) and a large number of recruits (N=2103) with 8 highly polymorphic microsatellite markers. Spatial genetic structure of the recruit and adult cohorts was significant, showing routine gene dispersal distances of ~100-400 m. Parentage analysis showed that 97% of recruits were within 100 m of their mother tree, and a high frequency of relatively short-distance pollen dispersal (median ~143-187 m). Despite routine seed and pollen dispersal distances of within a few hundred meters, interpatch gene flow occurred between all patches and was dominated by pollen movement: parentage analysis showed 76 pollen versus 2 seed interpatch dispersal events, and the seedling neighborhood model estimated ~1-6% seed immigration and ~21-46% pollen immigration rates, depending on patch. In addition, the smallest patch (containing five adult K. malaccensis trees) was entirely surrounded by >2.5 km of 'impervious' substrate, yet had the highest proportional pollen and seed immigration estimates of any patch. Hence, contrary to our hypothesis, insect-mediated gene flow persisted across an urban landscape, and several of our results also parallel key findings from insect-pollinated canopy trees sampled in mixed agricultural-forest landscapes. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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