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Ecological niche modelling and population genetic analysis of Indian temperate bamboo Drepanostachyum falcatum in the western Himalayas

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Abstract

The present study was conducted to understand the key ecological and biological questions of conservation importance in Drepanostachyum falcatum which aimed to map potential distribution in the western Himalayas and decipher spatial genetic structure. Eco-distribution maps were generated through ecological niche modelling using the Maximum Entropy (MaxEnt) algorithm implemented with 228 geocoordinates of species presence and 12 bioclimatic variables. Concomitantly, 26 natural populations in the western Himalayas were genetically analysed using ten genomic sequence-tagged microsatellite (STMS) markers. Model-derived distribution was adequately supported with appropriate statistical measures, such as area under the ‘receiver operating characteristics (ROC)’ curve (AUC; 0.917 ± 0.034)”, Kappa (K; 0.418), normalized mutual information (NMI; 0.673) and true skill statistic (TSS; 0.715). Further, Jackknife test and response curves showed that the precipitation (pre- and post-monsoon) and temperature (average throughout the year and pre-monsoon) maximize the probabilistic distribution of D. falcatum. We recorded a wide and abundant (4096.86 km2) distribution of D. falcatum in the western Himalayas with maximum occurrence at 1500 to 2500 m asl. Furthermore, marker analysis exemplified high gene diversity with low genetic differentiation in D. falcatum. Relatively, the populations of Uttarakhand are more genetically diverse than Himachal Pradesh, whereas within the Uttarakhand, the Garhwal region captured a higher allelic diversity than Kumaon. Clustering and structure analysis indicated two major gene pools, where genetic admixing appeared to be controlled by long-distance gene flow, horizontal geographical distance, aspect, and precipitation. Both the species distribution map and population genetic structure derived herein may serve as valuable resources for conservation and management of Himalayan hill bamboos.

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Acknowledgements

We thank the Director, Forest Research Institute, Dehradun and the Director, Himalayan Forest Research Institute, Shimla for providing laboratory and field facilities. The officials of state forest departments of Uttarakhand and Himachal Pradesh are also duly acknowledged for their assistance and permissions in surveying and sample collection from their jurisdictional forest area.

Funding

The work was financially supported by Indian Council of Forestry Research and Education (ICFRE), Dehradun as a research project [OG-49/CR-19].

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RKM, MSB and RS (Rajesh Sharma) conceptualized the problem and perform the task of field sampling, data analysis and interpretation, and preparation of draft manuscript. NN and NK performed field as well as laboratory work for population genetic analysis. RS (Rajeev Shankhwar) carried out geo-spatial analysis. RK, SP and HSG contributed in manuscript editing.

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Correspondence to Rajendra K. Meena.

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Meena, R.K., Negi, N., Shankhwar, R. et al. Ecological niche modelling and population genetic analysis of Indian temperate bamboo Drepanostachyum falcatum in the western Himalayas. J Plant Res 136, 483–499 (2023). https://doi.org/10.1007/s10265-023-01465-5

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  • DOI: https://doi.org/10.1007/s10265-023-01465-5

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