Application Of Stable Isotope Technique In Research Feeding Habits Of Rodents In Desert Region

In recent years,the application of stable isotope technology in animal ecology has been developing rapidly,especially in the determination of animal food sources.Compared with the traditonal methods,the stable isotope technique can be used to study the animal ecology,which can reflect the long-term effectand can be used to study the complex ecological relationships.The general idea of the research is:Through the indoor control measured in Alashan desert region four majoy species,Northern three-toed jerboa(Dipus sagitta),Mongolian five-toed jerboa(Allactaga sibirica),Mid-day gerbil(Meriones meridianus),Desert hamster(Phodopus roborovskii)fractionation in 3 kind of tissue-hair,liver and muscle of the ?13C and ?15N,classification of photosynthesis in plants in Alashan desert region based on 13C value,The IsoSource model was used to analyze the potential food sources of major rodents in different seasons.The results are as follows:1.46 species of plants belonging to 15 families and 38 genera were collected in the study area,According to the 13C value of the tested plant leaves,35 C3-plants were identified,and there were 11 C4-plants.2.The contribution rate of main food sources in spring in Northern three-toed jerboa:Salsola collina.33.4%,Cleistogenes songorica.13.8%,Corispermum mongolicum.13.3%.In summer:Bassia dasyphylla.31.5%,Caragana brachypoda.25.1%,Peganum harmala.19.8%.In autumn:Bassia dasyphylla.25.4%.Caragana brachypoda.15.5%,Haloxylon ammodendron.14.8%.3.The contribution rate of main food sources in spring in Mongolian five-toed jerboa:Salsola collina.43.2%.Bassia dasyphylla.21.0%.Corispermum mongolicum.20.9%.In summer:Peganum harmala.23.2%.Tiribulus terrestris.20.6%.Baassia dasphylla.16.2%.In autumn:Cleislogenes songorica.27.2%.Corispermum mongolicum.24.7%.Micropeplis arachnoidea.18.2%.4.The contribution rate of main food sources in spring in Mid-day gerbil:Bassia dasyphylla.17.2%.Corispermum mongolicum.17.0%.Salsola collina.15.1%.In summer:Bassia dasyphylla.28.5%,Ceratoides inlramongolica.21.4%.Micropeplis arachnoidea.16.4%.In autumn:Micropeplis arachnoidea.43.0%.Salsola collina.13.3%,Sarcozygium xanthoxylon,10.7%.5.The contributionrate of main food sources in autumn in Desert hamster:Sarcozygium xanthoxylon.35.8%,Peganum harmala.17.7%,Micropeplis arachnoidea.13.6%.