Combined Effects Of Resources And Warming On Lake Microbial Communities Across Environmental Gradients
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Combined Effects Of Resources And Warming On Lake Microbial Communities Across Environmental Gradients
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Author : Marika A. Schulhof
language : en
Publisher:
Release Date : 2018
Combined Effects Of Resources And Warming On Lake Microbial Communities Across Environmental Gradients written by Marika A. Schulhof and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018 with categories.
Multiple aspects of the global environment are changing rapidly, including rising temperatures, altered biogeochemical cycles and a redistribution of biodiversity. Different aspects of environmental change may interact through synergistic processes or interference; however, how these processes magnify or dampen one another's effects on lakes is largely unknown. My dissertation research explores the independent and interactive effects of warming and resource supply on lake food webs from multiple perspectives. Chapter 1 investigates the independent and interactive effects of temperature, supply and origin of dissolved organic material, and atmospheric nitrogen deposition on prokaryotic and eukaryotic microbial community composition and diversity in Sierra Nevada lakes. Chapter 2 focuses on stoichiometry and growth of phytoplankton communities in response to warming, nutrient addition and grazing in three Dutch lakes across a productivity gradient. Chapter 3 explores whether the competition-defense tradeoff regulates coexistence within or among members of phytoplankton communities across a productivity gradient, and how warming may alter this tradeoff. These studies collectively show that resource supply is more important than temperature in regulating microbial community composition and stoichiometry across a variety of lake ecosystems. Additionally, interactive effects of temperature, nutrient supply, and grazing on phytoplankton community stoichiometry, growth rates, biomass buildup and functional group composition depend on the trophic state and size structure of communities. Finally, turnover in communities along productivity gradients resulted in a positive correlation between nutrient and grazer limitation across taxa among lakes, but no relationship between top-down and bottom-up limitation within lakes. This result suggests that traits like small cell size that make phytoplankton more susceptible to grazing also confer strong responses to nutrient pulses in low-nutrient environments. Thus, my results provide no support for the hypothesis that costly defenses against grazing increase nutrient limitation, resulting in a tradeoff between nutrient and consumer limitation. In fact, the opposite pattern was found whereby the taxa that are most sensitive to grazing and nutrients are segregated in the least productive system, and the responses to both factors decline in more productive lakes due to increasing dominance by inedible forms. My thesis demonstrates functional associations among the traits of microbes that shape their responses to climate, resources and consumers, promote diversity at the local and regional scales, and determine how aquatic ecosystem productivity is controlled by multiple limiting factors.
Lake Sediment Microbial Communities In The Anthropocene
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Author : Matti Olavi Ruuskanen
language : en
Publisher:
Release Date : 2019
Lake Sediment Microbial Communities In The Anthropocene written by Matti Olavi Ruuskanen and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019 with categories.
Since the Industrial Revolution at the end of the 18th century, anthropogenic changes in the environment have shifted from the local to the global scale. Even remote environments such as the high Arctic are vulnerable to the effects of climate change. Similarly, anthropogenic mercury (Hg) has had a global reach because of atmospheric transport and deposition far from emission point sources. Whereas some effects of climate change are visible through melting permafrost, or toxic effects of Hg at higher trophic levels, the often-invisible changes in microbial community structures and functions have received much less attention. With recent and drastic warming-related changes in Arctic watersheds, previously uncharacterized phylogenetic and functional diversity in the sediment communities might be lost forever. The main objectives of my thesis were to uncover how microbial community structure, functional potential and the evolution of mercury specific functions in lake sediments in northern latitudes (>54{486}N) are affected by increasing temperatures and Hg deposition. To address these questions, I examined environmental DNA from sediment core samples and high-throughput sequencing to reconstruct the community composition, functional potential, and evolutionary responses to historical Hg loading. In my thesis I show that the microbial community in Lake Hazen (NU, Canada) sediments is structured by redox gradients and pH. Furthermore, the microbes in this phylogenetically diverse community contain genomic features which might represent adaptations to the cold and oligotrophic conditions. Finally, historical Hg pollution from anthropogenic sources has likely affected the evolution of microbial Hg resistance and this deposition can be tracked using sediment DNA on the Northern Hemisphere. My thesis underscores the importance of using culture-independent methods to reconstruct the structure, functional potential and evolution of environmental microbial communities.
Assembly And Functioning Of Microbial Communities Along Terrestrial Resource Gradients In Boreal Lake Sediments
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Author : Chloé Shoshana Jessica Orland
language : en
Publisher:
Release Date : 2018
Assembly And Functioning Of Microbial Communities Along Terrestrial Resource Gradients In Boreal Lake Sediments written by Chloé Shoshana Jessica Orland and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018 with categories.
Microbial Ecology In Reservoirs And Lakes
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Author : Haihan Zhang
language : en
Publisher: Frontiers Media SA
Release Date : 2020-08-14
Microbial Ecology In Reservoirs And Lakes written by Haihan Zhang and has been published by Frontiers Media SA this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020-08-14 with categories.
Selected Water Resources Abstracts
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Author :
language : en
Publisher:
Release Date : 1991
Selected Water Resources Abstracts written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991 with Hydrology categories.
Selected Water Resources Abstracts
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Author :
language : en
Publisher:
Release Date : 1991
Selected Water Resources Abstracts written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991 with Water categories.
High Mountain Conservation In A Changing World
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Author : Jordi Catalan
language : en
Publisher: Springer
Release Date : 2017-08-03
High Mountain Conservation In A Changing World written by Jordi Catalan and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-08-03 with Nature categories.
This book provides case studies and general views of the main processes involved in the ecosystem shifts occurring in the high mountains and analyses the implications for nature conservation. Case studies from the Pyrenees are preponderant, with a comprehensive set of mountain ranges surrounded by highly populated lowland areas also being considered. The introductory and closing chapters will summarise the main challenges that nature conservation may face in mountain areas under the environmental shifting conditions. Further chapters put forward approaches from environmental geography, functional ecology, biogeography, and paleoenvironmental reconstructions. Organisms from microbes to large carnivores, and ecosystems from lakes to forest will be considered. This interdisciplinary book will appeal to researchers in mountain ecosystems, students and nature professionals. This book is open access under a CC BY license.
North Sea Region Climate Change Assessment
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Author : Markus Quante
language : en
Publisher: Springer
Release Date : 2016-08-31
North Sea Region Climate Change Assessment written by Markus Quante and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016-08-31 with Science categories.
This book offers an up-to-date review of our current understanding of climate change in the North Sea and adjacent areas, as well as its impact on ecosystems and socio-economic sectors. It provides a detailed assessment of climate change based on published scientific work compiled by independent international experts from climate-related disciplines such as oceanography, atmospheric sciences, marine and terrestrial ecology, using a regional evaluation and review process similar to that of the Intergovernmental Panel on Climate Change (IPCC). It provides a comprehensive overview of all aspects of our changing climate, discussing a wide range of topics including past, current and future climate change, and climate-related changes in marine, terrestrial and freshwater ecosystems. It also explores the impact of climate change on socio-economic sectors such as fisheries, agriculture, coastal zone management, coastal protection, urban climate, recreation/tourism, offshore activities/energy, and air pollution.
Climate Change Impacts On Freshwater Ecosystems
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Author : Martin Kernan
language : en
Publisher: John Wiley & Sons
Release Date : 2011-02-14
Climate Change Impacts On Freshwater Ecosystems written by Martin Kernan and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011-02-14 with Science categories.
This text examines the impact of climate change on freshwater ecosystems, past, present and future. It especially considers the interactions between climate change and other drivers of change including hydromorphological modification, nutrient loading, acid deposition and contamination by toxic substances using evidence from palaeolimnology, time-series analysis, space-for-time substitution, laboratory and field experiments and process modelling. The book evaluates these processes in relation to extreme events, seasonal changes in ecosystems, trends over decadal-scale time periods, mitigation strategies and ecosystem recovery. The book is also concerned with how aspects of hydrophysical, hydrochemical and ecological change can be used as early indicators of climate change in aquatic ecosystems and it addresses the implications of future climate change for freshwater ecosystem management at the catchment scale. This is an ideal book for the scientific research community, but is also accessible to Masters and senior undergraduate students.
Digitizing Frozen Earth Revealing Microbial Diversity And Physiology In The Cryobiosphere Through Omics Tools Volume Ii
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Author : Anne D. Jungblut
language : en
Publisher: Frontiers Media SA
Release Date : 2022-11-11
Digitizing Frozen Earth Revealing Microbial Diversity And Physiology In The Cryobiosphere Through Omics Tools Volume Ii written by Anne D. Jungblut and has been published by Frontiers Media SA this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022-11-11 with Science categories.