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Urban Ecosystems

, Volume 21, Issue 1, pp 171–181 | Cite as

A fig tree in a concrete jungle: fine-scale population genetic structure of the cluster fig Ficus racemosa in an urban environment

  • Anusha Krishnan
  • Renee M. BorgesEmail author
Article
  • 258 Downloads

Abstract

Urban vegetation is an essential requirement in cities for mitigating pollution, heat island effects and providing food and shelter to urban fauna. Efforts to conserve and augment green cover in cities, however, often lack data on the genetic diversity of urban trees, which could be crucial to the success of such programmes. We investigate the population genetics of the cluster fig Ficus racemosa, which occurs naturally in Indian cities and is a keystone species for urban fauna. Genetic analysis of 51 F. racemosa trees in urban Bangalore, India, shows no evidence of inbreeding; the overall inbreeding coefficient (F is ) across 12 microsatellite markers (0.0366) was non-significant with no evidence of heterozygote deficit. Spatial genetic structure (SGS) analysis of 47 trees showed an overall negative relationship between kinship coefficient and spatial distance, with strong SGS at distances <1 km. The absence of heterozygote deficit is likely due to the fig’s obligate mutualistic association with fig wasps which pollinate their flowers even across long distances. However, the strong SGS at short distances could result from clumped seed dispersal close to natal trees. Therefore, the pattern of population genetics for F. racemosa from urban Bangalore likely results from short-distance seed dispersal and long-distance pollen flow. Despite the scattered and fragmented nature of green areas within cities, these gene mobility factors maintain robust population genetics in F. racemosa even at low population densities. The same may not apply for Ficus species that are planted as vegetative cuttings in cities and therefore may have limited genetic diversity.

Keywords

Figs Keystone resource Pollen movement Population genetic structure Bangalore India 

Notes

Acknowledgments

The authors thank Chethana S.L. and Santosh Revadi for help with data collection, Yathiraj Ganesh for sample collections and Sunitha Murray for administrative help. The authors also thank Vignesh Venkateswaran, Mahua Ghara, Yuvaraj Ranganathan, Joyshree Chanam, Lakshya Katariya, Pratibha Yadav, Santosh Revadi and Nikita Zachariah for useful comments on the work. This work was supported by the Ministry of Environment, Forests & Climate Change, Department of Biotechnology, Department of Science and Technology (DST-FIST), Government of India.

Supplementary material

11252_2017_707_MOESM1_ESM.docx (18 kb)
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© Springer Science+Business Media, LLC 2017

Authors and Affiliations

  1. 1.FM-08, Gopalan Temple Trees ApartmentBangaloreIndia
  2. 2.Centre for Ecological SciencesIndian Institute of ScienceBangaloreIndia

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