Environmental variables influencing phytoplankton communities in hydrologically connected aquatic habitats in the Lake Xingkai basin

Yuan, Youxi; Jiang, Ming; Liu, Xingtu; Yu, Hongxian; Otte, Marinus L.; Ma, Chengxue; Her, Younggu

doi:10.1016/j.ecolind.2018.03.085

Cited by 50 publications

(40 citation statements)

References 46 publications

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“…The present study provides direct evidence to prove that the interconnectivity among natural aquatic habitats can reduce the spatial heterogeneity of bacteria therein. Our finding was consistent with two studies of interconnected lakes at the local scale that found small spatial differences in BCCs (1,30). However, our observation was in contrast to Lear et al (31), who proved that even within the highly continuous environment of lentic water, distinct bacterial communities are present across unexpectedly small spatial scales.…”

Section: Discussionsupporting

confidence: 93%

Geographic Patterns of Bacterioplankton among Lakes of the Middle and Lower Reaches of the Yangtze River Basin, China

Bai

Cai

Zhou

et al. 2020

Appl Environ Microbiol

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The revolution of molecular techniques has revealed that the composition of natural bacterial communities normally includes a few abundant taxa and many rare taxa. Unraveling the mechanisms underlying the spatial assembly process of both abundant and rare bacterial taxa has become a central goal in microbial ecology. Here, we used high-throughput sequencing to explore geographic patterns and the relative importance of ecological processes in the assembly of abundant and rare bacterial subcommunities from 25 lakes across the middle and lower reaches of Yangtze River basin (MLYB), located in Southeast China, where most of the lakes are interconnected by river networks. We found similar biogeographic patterns of abundant and rare subcommunities which could significantly distinguish the community compositions of the two lake groups that were far from each other but which could not distinguish the community compositions of the nearby lakes. Both abundant and rare bacteria followed a strong distance-decay relationship. These findings suggest that the interconnectivity between lakes homogenizes the bacterial communities in local areas, and the abundant and rare taxa therein may be affected by the same ecological process. In addition, based on the measured environmental variables, the deterministic processes explain a small fraction of variation within both abundant and rare subcommunities, while both neutral and null models revealed a high stochasticity ratio for the spatial distribution patterns of both abundant and rare taxa. These findings indicate that the stochastic processes exhibited a greater influence on both abundant and rare bacterial subcommunity assemblies among interconnected lakes. IMPORTANCE The middle and lower Yangtze Plain is a typical floodplain in which many lakes connect with each other, especially in the wet season. More importantly, with the frequent change of regional water level in the wet season, there is a mutual hydrodynamic exchange among these lakes. The microbial biogeography among these interconnected lakes is still poorly understood. This study aims to unravel the mechanisms underlying the assembly process of abundant and rare bacteria among the interconnected lakes in the middle and lower Yangtze Plain. Our findings will provide a deeper understanding of the biogeographic patterns of rare and abundant bacterial taxa and their determined processes among interconnected aquatic habitats.

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Section: Discussionsupporting

confidence: 93%

Geographic Patterns of Bacterioplankton among Lakes of the Middle and Lower Reaches of the Yangtze River Basin, China

Bai

Cai

Zhou

et al. 2020

Appl Environ Microbiol

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“…In our study, wetlands connected by seeps showed distinct element composition with other wetlands, indicating that changes in connectivity are an important factor influencing hydro-chemical connectivity between depressional wetlands. This was also observed by Yuan et al (2018) in different wetland ecosystems. These findings confirmed our third hypothesis that element composition of wetlands showed spatial variations across the study area.…”

Section: Connectivity Between Wetlandssupporting

confidence: 77%

Multi-element fingerprinting of waters to evaluate connectivity among depressional wetlands

Yuan

Zhu

Mushet

et al. 2019

Ecological Indicators

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Establishing the connectivity among depressional wetlands is important for their proper management, conservation and restoration. In this study, the concentrations of 38 elements in surface water and porewater of depressional wetlands were investigated to determine chemical and hydrological connectivity of three hydrological types: recharge, flow-through, and discharge, in the Prairie Pothole Region of North America. Most element concentrations of porewater varied significantly by wetland hydrologic type (p < 0.05), and increased along a recharge to discharge hydrologic gradient. Significant spatial variation of element concentrations in surface water was observed in discharge wetlands. Generally, higher element concentrations occurred in natural wetlands compared to wetlands with known disturbances (previous drainage and grazing). Electrical conductivity explained 42.3% and 30.5% of the variation of all element concentrations in porewater and surface water. Non-metric multidimensional scaling analysis showed that the similarity decreased from recharge to flowthrough to discharge wetland in each sampling site. Cluster analysis confirmed that element compositions in porewater of interconnected wetlands were more similar to each other than to those of wetlands located farther away. Porewater and surface water in a restored wetland showed similar multi-element characteristics to natural wetlands. In contrast, depressional wetlands connected by seeps along a deactivated drain-tile path and a grazed wetland showed distinctly different multi-element characteristics compared to other wetlands sampled. Our findings confirm that the multi-element fingerprinting method can be useful for assessing hydro-chemical connectivity across the landscape, and indicate that element concentrations are not only affected by land use, but also by hydrological characteristics.

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“…The phytoplankton dynamics in study area are similar to those of small European and African interconnected habits such as Lake Naivasha 25 , Lake Mikri Prespa 12 , and Mississippi River 26 . Environmental variables such as flow rate, velocity, light and nutrient availability are vital characteristics that www.nature.com/scientificreports/ directly affect the diversity and dispersal of phytoplankton in rivers and wetlands 2,21,27 . Thus, the dynamic of phytoplankton community can be an excellent bio-indicator in spatial and temporal scale of this environmental change 2,28 .…”

Section: Impacts Of Hydrological Connectivity On Phytoplankton Communmentioning

confidence: 99%

“…Environmental variables such as flow rate, velocity, light and nutrient availability are vital characteristics that www.nature.com/scientificreports/ directly affect the diversity and dispersal of phytoplankton in rivers and wetlands 2,21,27 . Thus, the dynamic of phytoplankton community can be an excellent bio-indicator in spatial and temporal scale of this environmental change 2,28 . The hydrological connectivity in wetland-river conditions was significantly affected by rainfall and snowmelt events 29 .…”

Section: Impacts Of Hydrological Connectivity On Phytoplankton Communmentioning

confidence: 99%

Phytoplankton alpha diversity indices response the trophic state variation in hydrologically connected aquatic habitats in the Harbin Section of the Songhua River

Meng

et al. 2020

Sci Rep

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The relationship between biodiversity and ecological functioning is a central issue in freshwater ecology, but how this relationship is influenced by hydrological connectivity stress is still unknown. In this study we analyzed the dynamic of the phytoplankton alpha diversity indices and their relationships with trophic state in two hydrologically connected aquatic habitats (Jinhewan Wetland and Harbin Section of the Songhua River) in the Songhua River Basin in northeast China. We hypothesized that the phytoplankton alpha-diversity indices have the potential to provide a signal linking trophic state variation in hydrologically connected aquatic habitats. Our results showed the Cyanophyta and Bacillariophyta were abundant at most stations. T-test showed that phytoplankton alpha diversity indices varied significantly between rainy season and dry season. Trophic State Index recorded that a meso-trophic to eutrophic states of two connected habits during study period. Multivariate statistical analysis revealed that the dynamic of phytoplankton alpha diversity index was closely associated with trophic states change. Our result indicated that hydrological connectivity is a key factor influenced phytoplankton community assembly. In addition, it is beneficial to develop an integrated approach to appropriately describe and measure the trophic state variations of hydrologically connected aquatic habits in freshwater ecosystem.

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Environmental variables influencing phytoplankton communities in hydrologically connected aquatic habitats in the Lake Xingkai basin

Cited by 50 publications

References 46 publications

Geographic Patterns of Bacterioplankton among Lakes of the Middle and Lower Reaches of the Yangtze River Basin, China

Geographic Patterns of Bacterioplankton among Lakes of the Middle and Lower Reaches of the Yangtze River Basin, China

Multi-element fingerprinting of waters to evaluate connectivity among depressional wetlands

Phytoplankton alpha diversity indices response the trophic state variation in hydrologically connected aquatic habitats in the Harbin Section of the Songhua River

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