Diversity and distribution of sediment bacteria across an ecological and trophic gradient

AbstractCan we cluster bacterial sediment communities based on lake size, depth, and trophic status? Or, are bacterial microbial communities an emergent property of their geography, integrating regional physical and climatic conditions? Lakes in Minnesota are uniquely situated to address these questions because of their wide geographic range and variability in size and basin land-use. In this study, we selected twenty lakes with varying morphological and chemical properties across four ecological regions of Minnesota. Our objectives were to (i)) evaluate the diversity and spatial variation of the bacterial community at the sediment-water interface and (ii) determine how lake location and watershed land-use impact aqueous chemistry and influence community structure. Our data indicate that sediment communities from similar depth intervals are more likely to cluster by ecological region rather than any individual lake properties (e.g., trophic status, TP concentration, lake depth). However, composition is tied to a given lake, wherein samples from the same core were more alike than samples at similar depths across lakes. Our results illustrate the diversity within lake sediment microbial communities and provide insight into relationships between taxonomy, physicochemical, and geographic properties of north temperate lakes.

Download Full-text

The effect of dreissenid invasions on chlorophyll and the chlorophyll : total phosphorus ratio in north-temperate lakes

Canadian Journal of Fisheries and Aquatic Sciences ◽

10.1139/f10-134 ◽

2011 ◽

Vol 68 (2) ◽

pp. 319-329 ◽

Cited By ~ 33

Author(s):

S. N. Higgins ◽

M. J. Vander Zanden ◽

L. N. Joppa ◽

Y. Vadeboncoeur

Keyword(s):

Total Phosphorus ◽

Dreissena Polymorpha ◽

Trophic Status ◽

Hierarchical Modeling ◽

Significant Decline ◽

Analysis Of Covariance ◽

Temperate Lakes ◽

Regression Approach ◽

North Temperate Lakes ◽

Lake Size

We investigated the effects of dreissenid mussel ( Dreissena polymorpha and D. rostriformis bugensis ) invasions on the concentrations of chlorophyll a (Chl) and total phosphorus(TP), and the Chl:TP ratio within 27 north-temperate lakes that spanned large gradients in lake size and trophic status, using two approaches: (i) regression analysis and (ii) hierarchical modeling. Overall, Chl declined by 40%–45% after dreissenid invasion and the magnitude of effect was structured by epilimnetic volume within stratified, but not nonstratified (mixed) lakes. Declines in TP over the invasion period were significant only for stratified systems and were smaller (∼16% reduction from pre-invasion values) than for Chl. Across the complete trophic gradient (i.e., among lakes) the regression approach (analysis of covariance) indicated a significant decline in the intercept of the Chl:TP, but not the slope. In contrast, hierarchical modeling indicated a decline in the slope of Chl:TP among lakes between pre- and post-invasion periods. As with Chl, the effect of dreissenids on Chl:TP declined with increases in epilimnetic volume in stratified, but not nonstratified lakes. Dreissenid effects on Chl were prolonged, with no indication of diminishing within 7–10 years of invasion.

Download Full-text

The role of land use types and water chemical properties in structuring the microbiomes of a connected lakes system

10.1101/401299 ◽

2018 ◽

Cited By ~ 2

Author(s):

Sophi Marmen ◽

Lior Blank ◽

Ashraf Al-Ashhab ◽

Assaf Malik ◽

Lars Ganzert ◽

...

Keyword(s):

Water Quality ◽

Land Use ◽

Microbial Communities ◽

Drainage Basin ◽

Chemical Properties ◽

Early Summer ◽

Water Bodies ◽

Drainage Basins ◽

Ecological Changes ◽

Freshwater Bodies

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 7 different drainage basins in northern Germany, and the microbiomes of these lakes during early summer. Lake microbiome structure was not determined by 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, NO2+NO3 concentrations in the water, which (together with temperature, chlorophyll a and total phosphorus) affected 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 environmentally important Cyanobacteria and Verrucomicrobia, were differentially partitioned between the lakes. As the amount of available data on land use (e.g. from remote sensing) increases, identifying relationships between land use, aquatic microbial communities and their effect on water quality will be important to better manage freshwater resources worldwide, e.g. by systemically identifying water bodies prone to ecological changes or the presence of harmful organisms.

Download Full-text

The Effect of Land Use Type and Climatic Conditions on Carbon Dynamics and Physico-Chemical Properties of Inceptisols and Mollisols

Sarhad Journal of Agriculture ◽

10.17582/journal.sja/2016.32.4.364.371 ◽

2016 ◽

Vol 32 (4) ◽

pp. 364-371

Author(s):

Aqila Shaheen ◽

Mehwish Matien

Keyword(s):

Land Use ◽

Chemical Properties ◽

Carbon Dynamics ◽

Climatic Conditions ◽

Land Use Type ◽

Physico Chemical

Download Full-text

Land-use types and soil chemical properties influence soil microbial communities in the semiarid Loess Plateau region in China

Scientific Reports ◽

10.1038/srep45289 ◽

2017 ◽

Vol 7 (1) ◽

Cited By ~ 34

Author(s):

Qin Tian ◽

Takeshi Taniguchi ◽

Wei-Yu Shi ◽

Guoqing Li ◽

Norikazu Yamanaka ◽

...

Keyword(s):

Land Use ◽

Microbial Communities ◽

Loess Plateau ◽

Soil Microbial Communities ◽

Chemical Properties ◽

Soil Chemical Properties ◽

Plateau Region ◽

Soil Microbial ◽

Land Use Types

Download Full-text

Biomonitoring of the Urban Environment of Kielce and Olsztyn (Poland) Based on Studies of Total and Bioavailable Lead Content in Soils and Common Dandelion (Taraxacum officinale agg.)

Minerals ◽

10.3390/min11010052 ◽

2021 ◽

Vol 11 (1) ◽

pp. 52

Author(s):

Ewelina Zajęcka ◽

Anna Świercz

Keyword(s):

Land Use ◽

Chemical Properties ◽

Total Content ◽

Urban Ecosystems ◽

Speciation Analysis ◽

Climatic Conditions ◽

Lead Contamination ◽

Geochemical Background ◽

Land Use Types ◽

Common Dandelion

Kielce and Olsztyn are two different urban ecosystems. They differ from each other in terms of geological and climatic conditions, as well as spatial development and industrial past. The aim of this article is to assess and compare the degree of lead contamination of the natural environment in both cities based on the conducted tests of soils, as well as a common dandelion’s roots and leaves. For this study’s purpose, 60 samples of soils and common dandelion’s roots and leaves were collected in each city, according to four land-use types, namely industrial areas, urban green areas, urban allotment gardens, and urban forests. Basic physico-chemical properties and concentrations of lead, i.e., total content and bioavailable content were determined in the soils, using speciation analysis. Lead concentrations in the roots and leaves of common dandelion were, in turn, determined using the ICP-OES method. By using kriging models, spots with excessive lead concentrations differing from the geochemical background were identified in each city. The number of spots was comparable for both cities; however, the values for this metal differed significantly. No relationship has been found between land-use types and concentrations of lead in soils and common dandelions. The results of the study, as well as statistical and spatial analyses show that this species may be recommended as an indicator for biomonitoring of urban environments.

Download Full-text

Headwater Stream Microbial Diversity and Function across Agricultural and Urban Land Use Gradients

Applied and Environmental Microbiology ◽

10.1128/aem.00018-20 ◽

2020 ◽

Vol 86 (11) ◽

Author(s):

Sarah M. Laperriere ◽

Robert H. Hilderbrand ◽

Stephen R. Keller ◽

Regina Trott ◽

Alyson E. Santoro

Keyword(s):

Land Use ◽

Community Structure ◽

Microbial Community ◽

Microbial Diversity ◽

Microbial Communities ◽

Ecosystem Health ◽

Habitat Degradation ◽

Benthic Invertebrate ◽

Land Uses ◽

Watershed Land Use

ABSTRACT Anthropogenic activity impacts stream ecosystems, resulting in a loss of diversity and ecosystem function; however, little is known about the response of aquatic microbial communities to changes in land use. Here, microbial communities were characterized in 82 headwater streams across a gradient of urban and agricultural land uses using 16S rRNA gene amplicon sequencing and compared to a rich data set of physicochemical variables and traditional benthic invertebrate indicators. Microbial diversity and community structures differed among watersheds with high agricultural, urban, and forested land uses, and community structure differed in streams classified as being in good, fair, poor, and very poor condition using benthic invertebrate indicators. Microbial community similarity decayed with geodesic distance across the study region but not with environmental distance. Stream community respiration rates ranged from 21.7 to 1,570 mg O2 m−2 day−1 and 31.9 to 3,670 mg O2 m−2 day−1 for water column and sediments, respectively, and correlated with nutrients associated with anthropogenic influence and microbial community structure. Nitrous oxide (N2O) concentrations ranged from 0.22 to 4.41 μg N2O liter−1; N2O concentration was negatively correlated with forested land use and was positively correlated with dissolved inorganic nitrogen concentrations. Our findings suggest that stream microbial communities are impacted by watershed land use and can potentially be used to assess ecosystem health. IMPORTANCE Stream ecosystems are frequently impacted by changes in watershed land use, resulting in altered hydrology, increased pollutant and nutrient loads, and habitat degradation. Macroinvertebrates and fish are strongly affected by changes in stream conditions and are commonly used in biotic indices to assess ecosystem health. Similarly, microbes respond to environmental stressors, and changes in community composition alter key ecosystem processes. The response of microbes to habitat degradation and their role in global biogeochemical cycles provide an opportunity to use microbes as a monitoring tool. Here, we identify stream microbes that respond to watershed urbanization and agricultural development and demonstrate that microbial diversity and community structure can be used to assess stream conditions and ecosystem functioning.

Download Full-text