Aquatic Microbial Community Structure and Function Across a Gradient of Logging, Fire, and Industrial Watershed Disturbance - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Aquatic Microbial Community Structure and Function Across a Gradient of Logging, Fire, and Industrial Watershed Disturbance write by Caroline Emilson. This book was released on 2014. Aquatic Microbial Community Structure and Function Across a Gradient of Logging, Fire, and Industrial Watershed Disturbance available in PDF, EPUB and Kindle. The role of microbial communities in the recovery of aquatic ecosystems from watershed disturbance has received little attention despite their important role in energy and nutrient cycling. This study investigates the structure and function of microbial communities on a standardized substrate (alder leaves) in small streams across a wide gradient of watershed disturbances. Microbial communities exhibited variation with disturbance regime with lower hydrolase enzyme activities at all disturbed streams compared to undisturbed streams, and the lowest rates of microbial decomposition, fungal biomass, and differences in microbial community composition at the most severely disturbed streams. Forest and wetland cover were identified as important watershed features that provide DOC to fuel microbial activity in aquatic ecosystems. Increasing road density within the watershed was identified as having a negative impact or association on microbial activity that appeared to be linked to inputs of inorganic solutes that were measured through increased levels of specific conductance in stream water samples. This study is one of the first of its kind and it provides some important evidence that leaf litter associated microbial communities can be influenced by factors linked to watershed disturbance and as such may be useful as indicators of watershed disturbance and potentially the state of recovery of aquatic ecosystems.
Microbial Community Structure and Function in Coarse Woody Debris and Boreal Forest Soils After Intensified Biomass Harvests
Microbial Community Structure and Function in Coarse Woody Debris and Boreal Forest Soils After Intensified Biomass Harvests - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Microbial Community Structure and Function in Coarse Woody Debris and Boreal Forest Soils After Intensified Biomass Harvests write by Elizabeth Emily Smenderovac. This book was released on 2014. Microbial Community Structure and Function in Coarse Woody Debris and Boreal Forest Soils After Intensified Biomass Harvests available in PDF, EPUB and Kindle. Intensified biomass harvesting could prove to be negative for forest ecological health through the impacts this type of forest management could exert on microbial community structure and function in forest soils and in CWD pools. Microbial community functional characteristics as well as community structure (through T-RFLP and pyrotag sequencing of ssu rRNA) were assayed soils in a boreal jack pine forest exposed to a clearcut intensified harvesting gradient. Microbial communities within CWD of various decay stages were also assessed in order to determine habitat specificity of the decomposer communities within them. Soil microbial communities were altered by harvesting, but intensification did not cause further disturbance. Soils in harvested sites were different from fire sites also assayed, meaning that these disturbance types may have different impacts on microbial community structure and functioning. CWD communities within logs had different characteristics in different sites. Intensification could reduce site specific organisms important in decay initiation.
Anthropogenic Impacts on the Microbial Ecology and Function of Aquatic Environments
Anthropogenic Impacts on the Microbial Ecology and Function of Aquatic Environments - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Anthropogenic Impacts on the Microbial Ecology and Function of Aquatic Environments write by Maurizio Labbate. This book was released on 2016-09-06. Anthropogenic Impacts on the Microbial Ecology and Function of Aquatic Environments available in PDF, EPUB and Kindle. Aquatic ecosystems are currently experiencing unprecedented levels of impact from human activities including over-exploitation of resources, habitat destruction, pollution and the influence of climate change. The impacts of these activities on the microbial ecology of aquatic environments are only now beginning to be defined. One of the many implications of environmental degradation and climate change is the geographical expansion of disease- causing microbes such as those from the Vibrio genus. Elevating sea surface temperatures correlate with increasing Vibrio numbers and disease in marine animals (e.g. corals) and humans. Contamination of aquatic environments with heavy metals and other pollutants affects microbial ecology with downstream effects on biogeochemical cycles and nutrient turnover. Also of importance is the pollution of aquatic environments with antibiotics, resistance genes and the mobile genetic elements that house resistance genes from human and animal waste. Such contaminated environments act as a source of resistance genes long after an antibiotic has ceased being used in the community. Environments contaminated with mobile genetic elements that are adapted to human commensals and pathogens function to capture new resistance genes for potential reintroduction back into clinical environments. This research topic encompasses these diverse topics and describes the affect(s) of human activity on the microbial ecology and function in aquatic environments and, describes methods of restoration and for modelling disturbances.
Microbial Role in the Carbon Cycle in Tropical Inland Aquatic Ecosystems
Microbial Role in the Carbon Cycle in Tropical Inland Aquatic Ecosystems - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Microbial Role in the Carbon Cycle in Tropical Inland Aquatic Ecosystems write by André Megali Amado. This book was released on 2017-03-15. Microbial Role in the Carbon Cycle in Tropical Inland Aquatic Ecosystems available in PDF, EPUB and Kindle. Aquatic microorganisms are tidily related to the carbon cycle in aquatic systems, especially in respect to its accumulation and emission to atmosphere. In one hand, the autotrophs are responsible for the carbon input to the ecosystems and trophic chain. On the other hand, the heterotrophs traditionally play a role in the carbon mineralization and, since microbial loop theory, may play a role to carbon flow through the organisms. However, it is not yet clear how the heterotrophs contribute to carbon retention and emission especially from tropical aquatic ecosystems. Most of the studies evaluating the role of microbes to carbon cycle in inland waters were performed in high latitudes and only a few studies in the tropical area. In the prospective of global changes where the warm tropical lakes and rivers become even warmer, it is important to understand how microorganisms behave and interact with carbon cycle in the Earth region with highest temperature and light availability. This research topic documented microbial responses to natural latitudinal gradients, spatial within and between ecosystems gradients, temporal approaches and temperature and nutrient manipulations in the water and in the sediment.
Microbial Diversity and Ecosystem Functioning in Fragmented Rivers Worldwide
Microbial Diversity and Ecosystem Functioning in Fragmented Rivers Worldwide - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Microbial Diversity and Ecosystem Functioning in Fragmented Rivers Worldwide write by Lunhui Lu. This book was released on 2023-11-27. Microbial Diversity and Ecosystem Functioning in Fragmented Rivers Worldwide available in PDF, EPUB and Kindle. Dams or barriers are among the most significant anthropogenic threats to global freshwater ecosystems, although they provide invaluable services for shipping, hydropower generation, flood protection, and storage of drinking and irrigation water. River fragmentations due to dams and barriers lead the aquatic landscape into isolated river sections, resulting in hydromorphological discontinuities along longitudinal or lateral gradients. Fragmented river habitats are unstable. They experience uncertain disturbances in both time and space with random and complex hydrological and environmental processes, such as water flow, particulate matter sedimentation, reservoir regulation, and terrestrial input. The diversity, composition, functionality, and activity of microbial communities are important indicators of river ecosystem functions and services. Yet, river fragmentations are likely to disrupt and reconstruct microbial communities, redirecting the patterns of biogeochemical cycles of biogenic elements. Methodology, such as mathematical models, is still limited to describing and elucidating microbial processes under changing hydrological environments in the fragmented rivers. Thus, how do the riverine microbial communities and ecosystem functions respond to the fragmentation in rivers? This Research Topic represents a collective focus on microbial ecology, functional diversity, and new microbial modeling in fragmented rivers. We wish to present new findings in community assembly mechanisms, biotic interactions, functional diversity, and ecosystem functioning responses to the river fragmentations. New perspectives will also provide us with deep insights into the ecological effects of river fragmentation. This Research Topic aims to present the original research articles and reviews to provide new findings on microbial diversity and ecosystem functioning in fragmented rivers worldwide. We welcome original research, reviews, mini-reviews, opinions, methods, hypotheses and theories, and perspectives. The directions include but are not limited to the following aspects: - The continuum of the microbial community in responses to dams or barriers. - Novel microbial community assembly mechanisms, functional traits, and biotic interactions in fragmented rivers at local, regional, and global scales. - Functional genes, functional groups, and functional diversity in driving biogenic element cycles. - Mathematical modeling in aquatic microbial ecology.
