Diccionario politécnico Beigbeder
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ANOXIA defines the lack of free molecular oxygen in an environment. In the presence of organic matter, anaerobic prokaryotes produce compounds such as freeradicals, hydrogen sulfide, or methane that are typically toxic to aerobes. The concomitance of suppressed respiration and presence of toxic substances suggests these habitats are inhospitable to Eukaryota. Ecologists sometimes term such environments 'Death Zones'. This book presents, however, a collection of remarkable adaptations to anoxia, observed in Eukaryotes such as protists, animals, plants and fungi. Case studies provide evidence for controlled beneficial use of anoxia by, for example, modification of free radicals, use of alternative electron donors for anaerobic metabolic pathways, and employment of anaerobic symbionts. The complex, interwoven existence of oxic and anoxic conditions in space and time is also highlighted as is the idea that eukaryotic inhabitation of anoxic habitats was established early in Earth history.
Reveals eukaryotic strategies in anoxic environments. Includes cutting-edge research, data and hypotheses never before published. Offers also fundamental introductions, overviews and an exhaustive collection of literature for advanced studies.
INDICE: Introduction. Stepping into the book of Eukaryotes and Anoxia. List of Authors and their Addresses. List of External Reviewers and Referees. Acknowledgment to authors, reviewers and any special people who assisted.-. PARTI: GENERAL INTRODUCTION. Anaerobic eukaryotes. Biogeochemical reactions in marine sediments underlying anoxic water bodies. Diversity of anaerobic prokaryotes and eukaryotes – breaking long-established dogmas. PART II: FUNCTIONAL BIOCHEMISTRY. The biochemical adaptations of mitochondrion-related organelles of parasitic and free-living microbial eukaryotes to low oxygen environments. Hydrogenosomes and mitosomes: mitochondrial adaptations to life in anaerobic environments. Adapting to hypoxia: lessons from vascular endothelial growth factor. PART III: MANAGING ANOXIA. Magnetotactic protists at the oxic-anoxic transition zones of coastal aquatic environments. A novel ciliate (Ciliophora: Hypotrichida) isolated from bathyal anoxic sediments. The wood-eating termite hindgut: diverse cellular symbioses in a microoxic to anoxic environment. Ecological and experimental exposure of insects to anoxia reveals suprising tolerance.The unusual response of encysted embryos of the animal extremophile, Artemia franciscana , to prolonged anoxia. Survival of tardigrades in extreme environments – a model animal for astrobiology. Long-term anoxia-tolerance in flowering plants. PART IV: FORAMINIFERA. Benthic Foraminifera: inhabitants of low-oxygen environments. Ecological and biological response of benthic Foraminifera under oxygen-depleted conditions: evidence from laboratory approaches. The response of benthic Foraminifera to low-oxygen conditions of the Peruvian oxygen minimum zone. Benthic foraminiferal communities and microhabitat selection on the continental shelf off central Peru. - PART V: ZONES AND REGIONS. Living assemblages from the “Dead Zone” and naturally occurring hypoxic zones. The returnof shallow shelf seas as extreme environments: Anoxia and macrofauna reactions in the northern Adriatic Sea. Meiobenthos of the oxic/anoxic interface in the south-western region of the Black Sea: abundance and taxonomic composition. The role of eukaryotes in the anaerobic food web of stratified lakes. The anoxic Framvaren fjord as a model system to study protistan diversity and evolution. Characterizing an anoxic habitat: sulphur bacteria in a meromictic alpine lake. Ophel, the newly discovered hypoxic chemolitho-autotrophic groundwater biome - a window to ancient animal life. Microbial eukaryotes in the marine subsurface? - PART VI: MODERN ANALOGS AND TEMPLATES FOR EARTH HISTORY. On the use of stable nitrogen isotopes in present and past anoxic environments. Carbon and nitrogen isotopic fractionation in Foraminifera: possible signatures from anoxia. The functionality of pores in benthic Foraminifera in view of bottom water oxygenation. A review. Anoxia-dysoxia at the sediment-water interface of the southern
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