Received: 20 September 2019
Accepted: 19 August 2020
First Online: 31 August 2020
Ethics approval and consent to participate
: Not applicable. There was no requirement to seek ethical approval to carry out the work described above.
: Not applicable.
: All data generated or analysed during this study accompanying with R scripts have been submitted to ExternalRef removed.
: The authors declare that they have no competing interests.
: This research did not receive any specific grant from funding agencies in the public, commercial or not-for-profit sectors.
: SK: investigation, methodology, analysis, writing—original draft preparation. MRH: conceptualisation, methodology, writing—reviewing and editing, supervision. MTE: data curation, methodology, supervision. CB: resources, methodology, writing-reviewing and editing. All authors read and approved the final manuscript.
: We are grateful to Hossein Akhani and Atefeh Ghorbanalizadeh for their help in the field and their assistance with plant species identification. We also thank Esmail Ghadimi, Mojtaba Ghadimi and Javd Pourrezaei for assisting with data collection, Vicki Moore for the English revision of the manuscript, and four anonymous reviewers for valuable comments on an earlier version of the manuscript.