不同补给模式下冰川湖泊浮游藻类群落异质性及其构建机制OA

In the context of global warming,the retreat of glaciers on the Qinghai-Tibet Plateau has led to the formation of diverse glacial lakes.This process,by altering aquatic environmental conditions,influences the composition and distribution of microbial communities within these lakes.Investigating the heterogeneity of distinct algal communities and their assembly mechanisms across various glacial lake types is essential for understanding the distribution patterns of eukaryotic phytoplankton and their responses to environmental changes.This study focused on 10 glacial lakes in the Kuoqionggangri Glacier region of the southern Qinghai-Tibet Plateau,categorizing them into proglacial lakes,glacier-fed lakes,and non-glacier-fed lakes based on their meltwater supply pat-terns.By employing 18S rDNA amplicon sequencing,co-occurrence network analysis,and community assembly modeling,we e-valuated the impact of different water sources on eukaryotic phytoplankton communities.Results indicated that Chlorophyta was the dominant phylum.Proglacial lakes exhibited the highest α-diversity,the most stable community structures,and assembly processes governed primarily by dispersal limitation.Conversely,glacier-fed lakes displayed more fragmented community structures shaped mainly by heterogeneous selection,while non-glacier-fed lakes showed the lowest α-diversity,relied on strong species interactions for stability,and were dominated by stochastic assembly processes.Water conductivity and total dissolved solids were identified as significant factors influencing α-diversity,whereas nutrients exhibited limited effects.These findings underscore the substantial heterogeneity among glacial lake types in terms of species composition,α-and β-diversity,community stability,assembly mecha-nisms,and environmental drivers.This study provides critical insights into microbial community dynamics and ecological responses to environmental change in high-altitude glacial lake ecosystems.