兽类学报2025，Vol.45Issue(4)：446-456,11.DOI:10.16829/j.slxb.150961
基于稳定同位素技术的高原鼠兔营养生态位特征
Trophic inches characteristic of plateau pika(Ochotona curzoniae)in al-pine meadows determined by stable isotope analysis
摘要
Abstract
Understanding the nutritional niche relationships of plateau pikas(Ochotona curzoniae)at different population densities is crucial for comprehending their impact on grassland ecosystems and defining their ecological significance.This study investigates the nutritional niche characteristics of plateau pikas in the Qinghai-Tibet Plateau's alpine mead-ow using stable isotope(13C and 15N)techniques.Results showed that 15N and 13C stable isotopes enrich the fastest in liv-er and muscle tissues and the slowest in fur and bones.High-density pika populations have significantly higher δ13C andδ15N values than medium and low density populations.In the low,medium and high density populations,the trophic lev-el(δ15N range,NR),dietary diversity(δ13C range,CR),convex polygon area(total area,TA),and corrected standard el-lipse area(SEAC)reflected in the bone and fur tissues of the plateau pika were all higher than those in muscle and liver tissues.In the medium density population,the NR,CR,TA,and SEAC in liver,muscle,and fur tissues of the plateau pika were the largest,while in the low density population,the above four nutritional niche indicators reflected in the bone tis-sue of the plateau pika were the largest.Stable isotope niche widths in liver,muscle,and fur tissues are much broader in medium-density populations than in high-and low-density populations,with niche overlap across three population densi-ties of plateau pika.Bone and fur tissues exhibit higher niche overlap than muscle and liver tissues.We speculate that medium-density pika populations benefit from moderate disturbance effect,resulting in higher dietary diversity,nutrition-al niche width and area,thus better habitat suitability.It is recommended that local forestry and grassland authorities monitor medium-density pika populations(relative population density:24.94％-37.21％)and implement appropriate control measures to prevent irreversible damage to grasslands from overly high densities.关键词
高寒草甸/高原鼠兔/营养生态位/稳定同位素/贝叶斯椭圆Key words
Alpine meadow/Plateau pika(Ochotona curzoniae)/Trophic niche/Stable isotope/Bayesian ellipse分类
生物科学引用本文复制引用
周睿,宋梅玲,王玉琴,王宏生,马源..基于稳定同位素技术的高原鼠兔营养生态位特征[J].兽类学报,2025,45(4):446-456,11.基金项目
青海省自然科学基金(2024-ZJ-708) （2024-ZJ-708）
青海大学青年科研基金(2021-QNY-7) （2021-QNY-7）
青海省"高端创新人才计划"(引进拔尖人才) （引进拔尖人才）
国家林草局草地啮齿动物危害防控创新团队资助 （）
