Preliminary study on dietary selection in Shortridge's langurs(Trachypithecus shortridgei)from China

摘要：

DEAR EDITOR,
Understanding dietary selection and feeding strategies is important for the conservation and management of endangered primate species.Here,we conducted a preliminary study on the diet and feeding behavior of endangered Shortridge's langurs(Trachypithecus shortridgei)within the Drung River Valley(Dulongjiang)in southwestern China.The study site lies at a high latitude(N27°47.5')and elevation(1 900 m a.sl.)and is characterized by substantial annual rainfall(2 745.1 mm).From August 2012 to September 2013,we observed five groups of langurs and analyzed their overall food composition and dietary variation in spring and autumn.To understand their dietary adaptations to the distinctive habitat of the Drung River Valley,we also compared the diet of Shortridge's langurs to that of other Trachypithecus species inhabiting different environments.Results indicated that T.shortridgei fed on 52 plant species,23 of which each accounted for ≥1％ of their annual feeding time.Their primary dietary components included leaves(46.2％,young,mature,and petioles),fruits(28.7％,unripe 17.6％,ripe 11.1％),and mosses(10.2％).The langurs mainly consumed mature(34.2％)and young leaves(27.5％)in spring and ripe fruits(39.4％)and mature leaves(24.7％)in autumn.Two species of moss(Macrothamnium macrocarpum and Scapania verrucosa,21.2％ of annual feeding time),which are usually found growing together on cliffs,played a relatively important role in the diet of T.shortridgei.The langurs mainly consumed ripe fruits of Saurauia napaulensis(7.1％)and Dendropanax burmanicus(7.1％),which were abundant at lower elevations.Trachypithecus species in temperate forests consumed more fruits and seeds but fewer leaves(similar mature leaves but fewer young leaves)than those species in tropical forests,which may be related to their availability and abundance.Compared to Trachypithecus species in temperate forests,the higher proportion of mosses and mature leaves but fewer young leaves in the annual diet of T.shortridgei are likely a response to the distinctive Drung River Valley habitat.Therefore,conservation of the main food plants of this threatened species could be vital for its survival and conservation management.

所属期刊栏目：41

资助基金：This study was supported by the Yunnan Green Environment Development Foundation;National Natural Science Foundation of China;Program for Backup Talents of Young Academic and Technical Leaders in Yunnan Province;Yunnan High Level Personnel Training Support Program;Second Tibetan Plateau Scientific Expedition and Research Program;Biodiversity Survey,Observation and Assessment Programme of the Ministry of Ecology and Environment;Program for Graduate Student of Yunnan Education Department

在线出版日期：2021-02-02（万方平台首次上网日期，不代表论文的发表时间）

页数：共6页

页码：715-720