Ecological niche modelling of a critically endangered species Commiphora wightii (Arn.) Bhandari using bioclimatic and non-bioclimatic variables  

作　　者：Manish Mathur Preet Mathur Harshit Purohit 

机构地区：[1]ICAR-Central Arid Zone Research Institute,Jodhpur 342003,India [2]Jodhpur Institute of Engineering and Technology,Jodhpur,India [3]Neal Analytics,Pune,Maharashtra,India

出　　处：《Ecological Processes》2023年第1期110-139,共30页生态过程（英文）

摘　　要：Background The aim of this study is to examine the effects of four different bioclimatic predictors(current,2050,2070,and 2090 under Shared Socioeconomic Pathways SSP2-4.5)and non-bioclimatic variables(soil,habitat heterogeneity index,land use,slope,and aspect)on the habitat suitability and niche dimensions of the critically endangered plant species Commiphora wightii in India.We also evaluate how niche modelling affects its extent of occurrence(EOO)and area of occupancy(AOO).Results The area under the receiver operating curve(AUC)values produced by the maximum entropy(Maxent)under various bioclimatic time frames were more than 0.94,indicating excellent model accuracy.Non-bioclimatic characteristics,with the exception of terrain slope and aspect,decreased the accuracy of our model.Additionally,Maxent accuracy was the lowest across all combinations of bioclimatic and non-bioclimatic variables(AUC=0.75 to 0.78).With current,2050,and 2070 bioclimatic projections,our modelling revealed the significance of water availability parameters(BC-12 to BC-19,i.e.annual and seasonal precipitation as well as precipitation of wettest,driest,and coldest months and quarters)on habitat suitability for this species.However,with 2090 projection,energy variables such as mean temperature of wettest quarter(BC-8)and isothermality(BC-3)were identified as governing factors.Excessive salt,rooting conditions,land use type(grassland),characteristics of the plant community,and slope were also noticed to have an impact on this species.Through distribution modelling of this species in both its native(west-ern India)and exotic(North-east,Central Part of India,as well as northern and eastern Ghat)habitats,we were also able to simulate both its fundamental niche and its realized niche.Our EOO and AOO analysis reflects the possibility of many new areas in India where this species can be planted and grown.Conclusion According to the calculated area under the various suitability classes,we can conclude that C.wight-ii’s potentially suitable bioclim

关 键 词：Commiphora wightii Critically endangered MAXENT Habitat heterogeneity index Niche hypervolume 

分 类 号：Q948[生物学—植物学]