Shift in bacterioplankton diversity and structure: Influence of anthropogenic disturbances along the Yarlung Tsangpo River on the Tibetan Plateau, China

Abstract

River systems have critical roles in the natural water environment and the transportation of nutrients. Anthropogenic activities, including wastewater discharge and river damming, raise adverse impacts on ecosystem and continuum of rivers. An increasing amount of attention has been paid to riverine bacterioplankton as they make vital contributions to biogeochemical nutrient cycle. A comprehensive study was conducted on the bacterioplankton community along the Yarlung Tsangpo River, which is the longest plateau river in China and is suffering from various anthropogenic impacts. The results indicated that nutrient variations corresponded to anthropogenic activities, and silica, nitrogen and phosphorus were retained by the dam. River damming influenced the biomass and diversity of the bacterioplankton, but significant alterations in the community structure were not observed between upstream and downstream of the dam. Moreover, the spatial distribution of the bacterioplankton community changed gradually along the river, and the dominant bacterioplankton in the upstream, midstream and downstream portions of the river were Firmicutes, Bacteroidetes and Proteobacteria, respectively. Soluble reactive phosphorus, elevation, ammonium nitrogen, velocity and turbidity were the main environmental factors that shape the bacterioplankton community. Our study offers the first insights into the variation of a bacterioplankton community of a large river in plateau region.

Spatial and Seasonal Distribution and Transportation of Different Forms of Phosphorus in the Middle Reaches of the Yarlung Zangbo River

“…In August, the types and population density of plants are greater than those in November or April on beaches, shoaly land, and main river troughs. Moreover, SP is one of the main environmental factors that shapes the bacterioplankton community [41]. There is a great possibility that SP is used by phytoplankton or various types of plants for From the previous research, it is clear that the SP is the most easily released and is more bioavailable than other forms of P. In August, the normalized difference vegetation index (NDVI) and net primary productivity (NPP) of the middle reaches of the YLZB River were higher than the levels throughout the rest of that year [39,40].…”

“…In August, the types and population density of plants are greater than those in November or April on beaches, shoaly land, and main river troughs. Moreover, SP is one of the main environmental factors that shapes the bacterioplankton community [41]. There is a great possibility that SP is used by phytoplankton or various types of plants for growth, so the concentration of SP in surface sediments is lower in August than in November or April.…”

Suspended Sediment Transport Responses to Increasing Human Activities in a High-Altitude River: A Case Study in a Typical Sub-Catchment of the Yarlung Tsangpo River

“…Limited human activities have affected the fluvial systems in this region in the last century because of the cold and oxygen-deficient environment [22]. However, in recent decades, the river started to experience increasing human activities, such as urbanization and tourism [25], which are combined with rapid socioeconomic development and population expansion. Consequently, more attention has been paid to the impacts of human activities on fluvial systems in this region.…”

Bacterial Diversity in Aquatic Ecosystems over the Central Himalayas, Nepal: Progress and Future Perspectives

“…Numerous abiotic and biotic factors (e.g., temperature, oxygen, pH, conductivity, water transparency, organic matter concentration, biodegradable nutrients, water current, Bacteriophages , Zooplanktons, Chlorophyll a (Chla) content are the factors affecting microbial communities in aquatic habitat (Beier et al, 2008;Lliro et al, 2014;Hayden and Beman, 2016). It is very essential to identify and characterize bacterial community to get the information about the ecological niches of bacteria in freshwater bodies (Shafi et al, 2017) and Namita Paudel Adhikari , Subash Adhikari and Ganesh Paudel Janapriya Journal of Interdisciplinary Studies (Jjis), volume VIII, 2019 202 assess the impact of anthropogenic activities (Wang et al, 2017) as well as the status of pollutants in water bodies (Unno et al, 2012). Due to the short generation time, bacteria can rapidly respond to the small change in environmental conditions.…”