Niche Analysis of the Main Fish in the Lhasa River Basin

The Lhasa River is one of the five tributaries Yarlung Zangbo River. It main industrial, agricultural and animal husbandry area in Tibet. plays an important ecological security barrier role regulating regional climate maintaining biodiversity. In order to understand resource utilization ability relationship fish River, provide basic data for protection sustainable diversity fishery resources September 2019 (autumn), June 2020 (summer), November (winter) March 2021 (spring) were investigated first time. catch determined by Index Relative Importance (IRI). Shannon index Pianka’s used analyze niche breadth overlap values caught Basin from three dimensions time, space space–time. results show that a total 1399 3 orders 4 families collected. Among them, there dominant species, Schizopygopsis younghusbandi, common Schizothorax waltoni, oconnori, Ptychobarbus dipogon, Triplophysa stenura Carassius auratus. spatial–temporal ranges 1.395 3.628. They are auratus, waltoni declining order. temporal generally small, indicating survival activities greatly affected seasonal changes. fluctuation range value 0–0.535, only 20% logarithm meaningful. species pairs with exceeding 0.300 reached 80%, while spatial low. distributions quite different, between obviously change distribution. This demonstrates competition intensity different positions.