Distinct microhabitats affect the relative balance of ecological processes shaping the spatial distribution of bacterial communities in lakeshore habitats

2021 ◽  
Author(s):  
Huimin Xu ◽  
Jin Zeng ◽  
Chaoran Li ◽  
Dayong Zhao ◽  
Rujia He ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Bacterial Communities ◽  
Ecological Processes

scholarly journals Bacterial community assembly in Atlantic cod larvae (Gadus morhua): contributions of ecological processes and metacommunity structure

2020 ◽  
Vol 96 (9) ◽  
Author(s):  
Ragnhild I Vestrum ◽  
Kari J K Attramadal ◽  
Olav Vadstein ◽  
Madeleine Stenshorne Gundersen ◽  
Ingrid Bakke
Keyword(s):  
Community Assembly ◽  
Bacterial Communities ◽  
Atlantic Cod ◽  
Animal Health ◽  
Striking Difference ◽  
Ecological Processes ◽  
Opportunistic Bacteria ◽  
Atlantic Cod Larvae ◽  
Microbe Interactions ◽  
Host Microbe Interactions

ABSTRACT Many studies demonstrate the importance of the commensal microbiomes to animal health and development. However, the initial community assembly process is poorly understood. It is unclear to what extent the hosts select for their commensal microbiota, whether stochastic processes contribute, and how environmental conditions affect the community assembly. We investigated community assembly in Atlantic cod larvae exposed to distinct microbial metacommunities. We aimed to quantify ecological processes influencing community assembly in cod larvae and to elucidate the complex relationship between the bacteria of the environment and the fish. Selection within the fish was the major determinant for community assembly, but drift resulted in inter-individual variation. The environmental bacterial communities were highly dissimilar from those associated with the fish. Still, differences in the environmental bacterial communities strongly influenced the fish communities. The most striking difference was an excessive dominance of a single OTU (Arcobacter) for larvae reared in two of the three systems. These larvae were exposed to environments with higher fractions of opportunistic bacteria, and we hypothesise that detrimental host–microbe interactions might have made the fish susceptible to Arcobacter colonisation. Despite strong selection within the host, this points to a possibility to steer the metacommunity towards mutualistic host–microbe interactions and improved fish health and survival.

Spatial diffusion modelling of juvenile Atlantic salmon (Salmo salar) shows ontogenetic increase in movement rates

2017 ◽  
Vol 74 (2) ◽  
pp. 202-207 ◽  
Author(s):  
A. Foldvik ◽  
S. Einum ◽  
A.G. Finstad
Keyword(s):  
Spatial Distribution ◽  
Atlantic Salmon ◽  
Salmo Salar ◽  
Continuous Distribution ◽  
Diffusion Models ◽  
Ontogenetic Changes ◽  
Ecological Processes ◽  
Breeding Sites ◽  
Atlantic Salmon Salmo Salar ◽  
The Individual

For organisms with extensive ontogenetic changes in phenotypes, knowledge of how movement of individuals changes throughout life is pivotal to understanding ecological processes. Here, we study the spatial distribution of a cohort of Atlantic salmon (Salmo salar) from hatching to their third summer of juvenile life, during which they go through a fourfold change in body size. The fish originated from three distinct breeding sites, and their distribution was mapped using electrofishing throughout the river at 10 sampling periods. The spatial distribution throughout ontogeny was analysed using diffusion models. The distribution changed from three distinct nonoverlapping distributions centred on the individual breeding sites at the early first summer stage to a single continuous distribution at the end of the study. The diffusion coefficient increased throughout ontogeny, and spatial distributions were well-described using diffusion models, explaining 46%–89% of the variation. This highlights the utility of diffusion models when considering spatial habitat structure both in conservation and research.

scholarly journals Spatial distribution of marine airborne bacterial communities

2015 ◽  
Vol 4 (3) ◽  
pp. 475-490 ◽  
Author(s):  
Jasmin S. Seifried ◽  
Antje Wichels ◽  
Gunnar Gerdts
Keyword(s):  
Spatial Distribution ◽  
Bacterial Communities

scholarly journals Microbial communities of soda lakes and pans in the Carpathian Basin: a review

2020 ◽  
Vol 71 (4) ◽  
pp. 393-404 ◽  
Author(s):  
Tamás Felföldi
Keyword(s):  
Bacterial Communities ◽  
Current Knowledge ◽  
Soda Lakes ◽  
Grazing Pressure ◽  
Carpathian Basin ◽  
Nutrient Load ◽  
Ecological Processes ◽  
Microbial Groups ◽  
Physical And Chemical ◽  
External Nutrient

AbstractIn this review, I would like to summarize the current knowledge on the microbiology of soda lakes and pans of the Carpathian Basin. First, the characteristic physical and chemical features of these sites are described. Most of the microbiological information presented deals with prokaryotes and algae, but protists and viruses are also mentioned. Planktonic bacterial communities are dominated by members of the phyla Actinobacteria, Bacteroidetes and Proteobacteria; small-sized trebouxiophycean green algae and Synechococcus/Cyanobium picocyanobacteria are the most important components of phytoplankton. Based on the current knowledge, it seems that mainly temperature, salinity, turbidity and grazing pressure regulate community composition and the abundance of individual microbial groups, but the external nutrient load from birds also has a significant impact on the ecological processes.

Soil pH drives the spatial distribution of bacterial communities along elevation on Changbai Mountain

2013 ◽  
Vol 57 ◽  
pp. 204-211 ◽  
Author(s):  
Congcong Shen ◽  
Jinbo Xiong ◽  
Huayong Zhang ◽  
Youzhi Feng ◽  
Xiangui Lin ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Soil Ph ◽  
Bacterial Communities ◽  
Changbai Mountain

scholarly journals Direct quantification of ecological drift at the population level in synthetic bacterial communities

2020 ◽  
Vol 15 (1) ◽  
pp. 55-66
Author(s):  
Stilianos Fodelianakis ◽  
Adriana Valenzuela-Cuevas ◽  
Alan Barozzi ◽  
Daniele Daffonchio
Keyword(s):  
Bacterial Communities ◽  
Population Level ◽  
Species Loss ◽  
Controlled Experiments ◽  
Ecological Processes ◽  
Β Diversity ◽  
High Selection ◽  
Experimental Findings ◽  
Ecological Drift ◽  
Direct Quantification

AbstractIn community ecology, drift refers to random births and deaths in a population. In microbial ecology, drift is estimated indirectly via community snapshots but in this way, it is almost impossible to distinguish the effect of drift from the effect of other ecological processes. Controlled experiments where drift is quantified in isolation from other processes are still missing. Here we isolate and quantify drift in a series of controlled experiments on simplified and tractable bacterial communities. We detect drift arising randomly in the populations within the communities and resulting in a 1.4–2% increase in their growth rate variability on average. We further use our experimental findings to simulate complex microbial communities under various conditions of selection and dispersal. We find that the importance of drift increases under high selection and low dispersal, where it can lead to ~5% of species loss and to ~15% increase in β-diversity. The species extinct by drift are mainly rare, but they become increasingly less rare when selection increases, and dispersal decreases. Our results provide quantitative insights regarding the properties of drift in bacterial communities and suggest that it accounts for a consistent fraction of the observed stochasticity in natural surveys.

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