Ecological niche modelling to project past, current and future distributional shift of black ebony tree (Diospyros melanoxylon Roxb.) in India

The present study utilized an ensemble modelling approach to predict the distribution of D. melanoxylon under present, past (Last Glacial Maximum, ~22,000 cal yr BP, Middle Holocene ~6000 cal yr BP) and future climate change scenarios (RCP 2.6 and 8.5 for 2050s and 2070s). The annual mean temperature, mean temperature of the wettest quarter and annual precipitations were the most critical parameters that chiefly influence the distribution of D. melanoxylon. The ensemble model rendered high accuracy with AUC=0.93, TSS=0.74, and Kappa=0.71. Past projections of D. melanoxylon indicated a widespread distribution during the Last Glacial Maximum and Middle Holocene suggesting its adaptability to semi-dry as well as warm and humid climates, respectively. The presence of fossil pollen evidence of D. melanoxylon in the suitable habitats derived through past projections in this study complements the model results and marks occurrences of the species during the Last Glacial Maximum and Middle Holo..., , , # Ecological niche modelling to project past, current and future distributional shift of black ebony tree (Diospyros melanoxylon Roxb.) in India ## Description of the data and file structure Species occurrence data was compiled from India Biodiversity Portal (IBP), Global biodiversity information facility (GBIF), field surveys, and herbarium records. All the occurrence data was combined and rarified. File name ‘Final_output_rarefied_points’ lists the species occurrence data points used for the model runs. Model output files (.asc) for Current, Middle Holocene, LGM, and future climate change scenarios are also uploaded. ## Sharing/Access information Links to other publicly accessible locations of the data are already given in the manuscript: * Secondary occurrence data points for the *D. melanoxylon* were extracted from online databases, i.e. Global Biodiversity Information Facility (GBIF) from the website  and Indian Biodiversity Portal from the website Bioclimatic Data w...本研究采用集成模拟建模方法，对黑檀树（Diospyros melanoxylon Roxb.）在当前、过去（末次盛冰期，约22000校准年BP，中全新世约6000校准年BP）以及未来气候变化情景（2050年代和2070年代的RCP2.6与RCP8.5）下的空间分布格局进行预测。年平均气温、最湿季平均气温与年降水量是主导该树种空间分布的核心环境变量。该集成模拟模型具备较高的预测精度，其AUC值为0.93、TSS值为0.74、Kappa值为0.71。针对该树种的过去分布模拟结果显示，其在末次盛冰期与中全新世时期均呈现广泛分布的格局，分别表明该树种对半干旱气候以及暖湿气候具有较强适应性。本研究通过过去气候情景模拟得到的适宜生境中，存在黑檀树的化石花粉证据，该发现佐证了模型结果，证实了该树种在末次盛冰期与中全新世时期的存在。# 用于预测印度境内黑檀树（Diospyros melanoxylon Roxb.）过去、当前与未来分布变化的生态位建模研究 ## 数据与文件结构说明 物种出现记录数据整合自印度生物多样性门户（India Biodiversity Portal, IBP）、全球生物多样性信息设施（Global Biodiversity Information Facility, GBIF）、野外调查及标本馆馆藏记录。所有出现记录数据均经过合并与空间抽稀处理。 文件名为"Final_output_rarefied_points"的文件，列出了用于模型运行的物种出现记录点位。 本次上传还包含当前、中全新世、末次盛冰期（LGM）以及未来气候变化情景下的模型输出文件（格式为.asc）。 ## 数据共享与获取说明 该数据集其他公开获取渠道的链接已在论文手稿中列明： * 黑檀树的辅助出现记录点位提取自在线数据库，即全球生物多样性信息设施（GBIF）与印度生物多样性门户（IBP）（原文未提供对应网址）。 生物气候数据……（原文未完结）