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Persistence of long-distance, insect-mediated pollen movement for a tropical canopy tree species in remnant forest patches in an urban landscape
Noreen, AME; Niissalo, MA; Lum, SKY; Webb, EL
2016
Source PublicationHEREDITY
ISSN0018-067X
Volume117Issue:6Pages:472-480
AbstractAs 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 similar to 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 similar to 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 similar to 1-6% seed immigration and similar to 21-46% pollen immigration rates, depending on patch. In addition, the smallest patch (containing five adult K. malaccensis trees) was entirely surrounded by 42.5 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.
KeywordGene Flow Fragmentation Genetics Koompassia-malaccensis Microsatellite Markers Habitat Fragmentation Mating Patterns Seed Production Populations Dispersal Plants
Indexed ByWOS:000387790400009
Language英语
Document Type期刊论文
Identifierhttp://ir.xtbg.org.cn/handle/353005/10210
Collection文献共享
Recommended Citation
GB/T 7714
Noreen, AME,Niissalo, MA,Lum, SKY,et al. Persistence of long-distance, insect-mediated pollen movement for a tropical canopy tree species in remnant forest patches in an urban landscape[J]. HEREDITY,2016,117(6):472-480.
APA Noreen, AME,Niissalo, MA,Lum, SKY,&Webb, EL.(2016).Persistence of long-distance, insect-mediated pollen movement for a tropical canopy tree species in remnant forest patches in an urban landscape.HEREDITY,117(6),472-480.
MLA Noreen, AME,et al."Persistence of long-distance, insect-mediated pollen movement for a tropical canopy tree species in remnant forest patches in an urban landscape".HEREDITY 117.6(2016):472-480.
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