The Role of Land Use Types and Water Chemical Properties in Structuring the Microbiomes of a Connected Lake System

Abstract

Lakes and other freshwater bodies are intimately connected to the surrounding land, yet to what extent land-use affects the quality of freshwater and the microbial communities living in various freshwater environments is largely unknown. We address this question through an analysis of the land use surrounding 46 inter-connected lakes located within seven different drainage basins in northern Germany, and the microbiomes of these lakes during early summer. Lake microbiome structure was not correlated with the specific drainage basin or by basin size, and bacterial distribution did not seem to be limited by distance. Instead, land use within the drainage basin could predict, to some extent, NO 2 + NO 3 concentrations in the water, which (together with temperature, chlorophyll a and total phosphorus) correlated to some extent with the water microbiome structure. Land use directly surrounding the water bodies, however, had little observable effects on water quality or the microbiome. Several microbial lineages, including Cyanobacteria and Verrucomicrobia, were differentially partitioned between the lakes. Significantly more data, including time-series measurements of land use and water chemical properties, are needed to fully understand the interaction between the environment and the organization of microbial communities.

Temporal Resistome and Microbial Community Dynamics in an Intensive Aquaculture Facility with Prophylactic Antimicrobial Treatment

“…For example, at the genus level, algal blooms in FP-03 predominantly comprised Microcystis , whereas Res water also contained high levels of Synechococcus . This finding is supported by previous reports indicating that Microcystis thrives in ecosystems rich in nutrients (such as intensive aquaculture ponds), whereas Synechococcus proliferates in more oligotrophic ecosystems [ 52 , 53 ].…”

Seasonal Dynamics Are the Major Driver of Microbial Diversity and Composition in Intensive Freshwater Aquaculture

“…An additional seasonal factor that could affect water quality and subsequently the aquatic microbiome, is rainfall. During significant rain events, DARU receives runoff from the surrounding agricultural fields, carrying sediments, nutrients, fertilizers, pesticides and other soil-based compounds ( Maltby et al, 1995 ; Page et al, 1995 ; Mallin et al, 2009 ; Kraemer et al, 2020 ; Marmen et al, 2020 ). Unfortunately, we currently lack a quantitative budget of the water and nutrient inputs into the reservoir and fishponds, which is needed to test the hypothesis that rainwater runoff may be important at DARU.…”

Seasonal dynamics are the major driver of microbial diversity and composition in intensive freshwater aquaculture

“…An additional seasonal factor that could affect water quality and subsequently the aquatic microbiome, is rainfall. During significant rain events, DARU receives runoff from the surrounding agricultural fields, carrying sediments, nutrients, fertilizers, pesticides and other soil-based compounds (Kraemer et al, 2020; Mallin et al, 2009; Maltby et al, 1995; Marmen et al, 2020; Page et al, 1995). While we lack a quantitative budget of the water and nutrient inputs into the reservoir and fishponds, our results suggest that such runoff may be important at DARU.…”