General information: 1.Database title:Diet analysis of David’s deer (Elaphurus davidianus) based on stable isotope technology "2.Principal investigator:Jingjing Zha,Nanjing Forestry University,2676544722@qq.com" "3.Date of Collection:2019-05,2019-07, 2019-10, 2019-12" 4.Geographic location of data collection:Jiangsu Dafeng David's Deer National Nature Reserve "5.Keywords:David’s Deer, diet, faeces, isotope, trophic shift, mixing model" "6.funding sources:National Key Research and Development Program(project No.2016YFC0502704), Jiangsu Biological Priority Academic Construction Project, Jiangsu Forestry Technological Innovation and Project Promotion(project No.LYKJ[2019]24)" Data and file overview: 1.Describtion of each file: Semi-captive deer faeces: this file includes stable c and n isotope values of semi-captive deer in different months. Free-ranging deer faeces:this file includes stable c and n isotope values of free-ranging deer in different months. Plant isotope values:this file includes stable c and n isotope values of plants in different months. Plant c and n concentration:this file includes c and n concentrations of plants in different months. Supplemental feed:this file includes stable c and n isotope values of supplemental feed in semi-captive area and stable c and n isotope values and c and n concentrations of supplemental feed in free-ranging area. 2.Date files created:2022-07-08 3.Methodological information: "methods for data collection or generation:Plant and faeces samples were collected in field, then processed in lab.Stable isotopes were obtained by a stable isotope ratio mass spectrometer (DELTA V Advantage) and c and n concentrations were obtained by an elemental analyzer ( PE 2400 II ).Trophic shift was refered from ""Eduardo Nájera-Hillman, Mandujano S. Fecal stable isotope analysis in white-tailed deer (Odocoileus virginianus), an alternative method for dietary ecology studies[J]. Wildlife Biology in Practice, 2013, 9(2):63-75."", concentration-weighted mixing model was refered from ""Phillips D L , Koch P L. Incorporating concentration dependence in stable isotope mixing models[J]. Oecologia, 2002, 130(1):114-125.""." "methods for data processing:results were presented as means±standars deviation,tests for significant changes were based on one-way ANOVA models." Software needed to understand or interpret the data:microsoft excel. "People involved with sample collection, processing, analysis and/or submission:Jingjing Zha, Yongbo Wu and Yuting An." Data-specific information: "Count of number of variables, and number of cases or rows:" "file""Semi-captive deer faeces"":3 variables, 3 raws" "file""Free-ranging deer faeces"":3 variables, 3 raws" "file""Plant isotope values"":4 variables,4 raws." "file""Plant c and n concentration"":4 variables,4 raws." "file""Supplemental feed"":2 variables,2 raws;4 variables,4 raws." "Units of measurement:isotpoe values(‰),c and n concentration(%)"