摘要
为探明纳木措春季水体可培养丝状真菌的群落特征,研究在分离纯化丝状真菌的基础上,结合经典分类法、rRNA-ITS转录间隔区测序法确定丝状真菌的群落组成及丰度;同时对水体理化因子进行分析,揭示丝状真菌优势类群生态分化与理化因子的相关性。结果在纳木措水体中共分离纯化出921株丝状真菌,归为20属62种,真菌资源较为丰富。其中,主要优势种(Y>0.02)包括:普通青霉Penicillium commune、酒色青霉Penicillium vinaceum、波兰青霉Penicillium polonicum、青霉菌Penicillium goetzii、灰玫瑰青霉Penicillium griseoroseum、冻土毛霉Mucor hiemalis、总状毛霉Mucor racemosus、格孢腔菌Pleosporales sp.2和壳青霉Penicillium crustosum。优势种生态位指数显示,优势种间生态响应速率之和为负数,低度重叠的种对占比较大(56.94%),总体上呈正关联,但未达到显著水平(χ2>3.841),表明群落正处于衰退阶段。优势种间竞争弱,关系松散,对资源利用或生态适应能力有着较大的差异,且优势种间未达到相对的动态平衡,尚未演替至顶级阶段。理化因子与优势种的相关性显示,盐浓度、电导率、化学需氧量、浊度及铵态氮是影响纳木措丝状真菌优势种分布的主要因子。相关研究为正确认识高原湖泊可培养丝状真菌种群特征提供了基础数据,也为可培养丝状真菌的开发和利用奠定了基础。
In order to explore the community characteristics of culturable filamentous fungi in Nam Co Lake in spring,the composition and abundance of filamentous fungi were determined based on the isolation and purification,combined with morphological characterization and ITS sequence analysis.At the same time,water environmental factors were determined to analyze correlations between ecological differentiation of dominant species of filamentous fungi and environmental factors in Nam Co Lake.The results showed that a total of 921 filamentous fungi strains were isolated from Nam Co Lake.These strains were identified as 62 species in 20 genera.Fungus resources are abundant,among which,the dominant species(Y>0.02)include:Penicillium commune,Penicillium vinaceum,Penicillium polonicum,Penicillium goetzii,Penicillium griseoroseum,Mucor hiemalis,Mucor racemosus,Pleosporales sp.2 and Penicillium crustosum.The niche indices of the dominant species showed that the sum of ecological response rates of dominant species is negative,and low overlap species accounted for a large proportion(56.94%).Overall,there was a positive correlation among the dominant species,but it did not reach a significant level(χ2>3.841),indicating that the community was in a stage of decline.With weak competition and loose relationships and great differences in resource utilization or ecological adaptability among dominant species.Moreover,the dominant species have not reached a relative dynamic balance,and their succession has not reached the top stage.The correlation between environmental factors and dominant species showed that salinity,conductivity,chemical oxygen demand,turbidity and ammonium nitrogen are the main factors affecting the distribution of dominant species of filamentous fungi in Nam Co Lake.These studies provided basic data for correctly understanding the population characteristics of culturable filamentous fungi in plateau lakes and laid a foundation for the development and utilization of culturable filamentous fungi.
作者
薛文凯
朱攀
郭小芳
德吉
XUE Wen-Kai;ZHU Pan;GUO Xiao-Fang;DE Ji(College of Science,Tibet University,Lhasa 850000,China)
出处
《水生生物学报》
CAS
CSCD
北大核心
2023年第10期1628-1639,共12页
Acta Hydrobiologica Sinica
基金
国家自然科学基金(31960024)
2019年中央支持地方高校改革发展基金(藏财预指[2019] 01号)
1号-20号中央支持地方高校专项高层次人才引进经费(藏财预指[2020])
西藏大学研究生高水平人才培养计划(2020-GSP-S044)资助。
关键词
纳木措
丝状真菌
优势种
生态位
Nam Co Lake
Filamentous fungi
Dominant species
Niche