Coastal Signals Of Environmental Changes Foraminifera As Benthic Monitors
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Coastal Signals Of Environmental Changes Foraminifera As Benthic Monitors
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Author : Inda Brinkmann
language : en
Publisher:
Release Date : 2022
Coastal Signals Of Environmental Changes Foraminifera As Benthic Monitors written by Inda Brinkmann and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022 with categories.
Climate changes, tightly linked to anthropogenic activities, are significantly altering environments and ecosystems globally, such as by increasing marine and coastal deoxygenation or occurrences of extreme weather events. The significance of paleoenvironmental and -climate reconstructions, as well as monitoring of current conditions, for unravelling baseline natural variation, today's changes and potential future impacts, has been recognised by the Intergovernmental Panel on Climate Change (IPCC) reports. However, to access past records of physical and chemical environmental variables, and comprehensively assess ecosystem reactions, reliable and sensitive proxies are critical. This thesis' focus lies on benthic foraminifera--unicellular protists with mineralised or organic test, abundantly inhabiting ocean and coastal sediments--and their calibration as indicator for a variety of environmental conditions in field-sampling approaches. The research projects follow two general strategic tracks: (I) a biogeochemical assessment of trace-elemental ratios in foraminiferal calcium-carbonate tests using high-resolution, micro-analytical techniques; (II) a molecular approach investigating foraminiferal environmental DNA derived from coastal sediments. Papers I and II concern the calibration of the benthic foraminiferal Mn/Ca proxy for marine oxygenation conditions in modern field studies. Trace-element concentrations and distributions were measured by plasma-, laser- and synchrotron-based analyses in a high-resolution, individual-foraminifera approach, and interpreted in the context of ambient physical and chemical conditions of the water column, pore-waters and sediments (including oxygen and manganese concentrations). Investigating two coastal systems with almost permanently severely oxygen-deficient bottom-waters (Santa Barbara Basin, Paper I), and undergoing a seasonal oxygenation cycle across the low- to well-oxygenated range (Gullmar Fjord, Paper II), respectively, demonstrated the utility of the Mn/Ca proxy for indicating low-oxygen conditions specifically. Continued calibration efforts under consideration of ambient oxygenation and redox regimes may open further possibilities of quantitative oxygen reconstructions. Paper III explores the use of coastal, benthic Ba/Ca records as indicator of riverine runoff and drought on land across the years 2018 and 2019, characterised by severe heat and drought, and warm and wet conditions, respectively. Benthic Ba/Ca correlated significantly with the hydroclimate conditions, as inferred from extensive meteorological and hydrological data sets of the region, highlighting qualitative proxy potential for paleo-drought reconstructions. Based on ambient sediment and pore-water geochemistry, we discuss mediation of water-column transport and pore-water Ba cycling by Fe and Mn oxides. All three investigations of these geochemical proxies (Paper I-III) highlighted the significance of biological controls on foraminiferal TE/Ca, which are species-specific and, thus, should be a deciding factor in choosing proxy candidate species. In particular the influences of micro-habitat distribution and utilised metabolic pathways by foraminifera are discussed in detail. In Paper IV foraminiferal biodiversity and assemblage responses to natural and anthropogenic environmental trends in a fjord system (Swedish west coast) are documented in a metabarcoding approach. Environmental DNA successfully tracked biodiversity and community composition changes associated with contrasting ecosystems but showed damped sensitivity to environmental variability on sub-annual time-scales. Overlaps and discrepancies between molecular and traditional, observation-based assessment techniques, as well as future trajectories to resolve uncertainties are discussed. Overall, this thesis solidifies and expands the currently available proxy toolbox for reconstructions of both coastal low-oxygen, as well as terrestrial hydroclimate conditions. The findings contribute towards filling current knowledge gaps pertaining to biotic impacts on foraminifera-derived biogeochemical signals and methodological uncertainties in metabarcoding approaches and highlight the significance of implementing molecular techniques in conventional foraminiferal assemblage studies.
Monitoring In Coastal Environments Using Foraminifera And Thecamoebian Indicators
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Author : David B. Scott
language : en
Publisher: Cambridge University Press
Release Date : 2007-02-22
Monitoring In Coastal Environments Using Foraminifera And Thecamoebian Indicators written by David B. Scott and has been published by Cambridge University Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007-02-22 with Science categories.
Emphasizes the methodological approaches being used for environmental applications of foraminifera and thecamoebians. Its main audience will include researchers and consultants, but it will also serve as a supplementary text for graduate students in courses that deal with environmental monitoring and assessment.
Monitoring In Coastal Environments Using Foraminifera And Thecamoebian Indicators
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Author : David B. Scott
language : en
Publisher: Cambridge University Press
Release Date : 2001-06-18
Monitoring In Coastal Environments Using Foraminifera And Thecamoebian Indicators written by David B. Scott and has been published by Cambridge University Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001-06-18 with Science categories.
Here is the first comprehensive book to describe specific environmental applications of foraminifera and thecamoebians. These organisms permit the biological characterization of a variety of freshwater and coastal marine environments and react quickly to environmental stress, natural or anthropogenic. Their small size and hard shells lead to preservation in large numbers in core samples, allowing their use as proxies to reconstruct past environmental conditions. The book introduces the topic to nonspecialists and then goes on to give detailed descriptions of the methods and techniques. Resource managers and consultants in the public and private sectors who routinely work on coastal environmental problems will find this book invaluable.
Response Of Benthic Foraminifera To Environmental Variability
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Author : Maria Virginia Alves Martins
language : en
Publisher:
Release Date : 2019
Response Of Benthic Foraminifera To Environmental Variability written by Maria Virginia Alves Martins and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019 with Science categories.
Foraminifera are eukaryotic unicellular microorganisms inhabiting all marine environments. The study of these protists has huge potential implications and benefits. They are good indicators of global change and are also promising indicators of the environmental health of marine ecosystems. Nevertheless, much remains to be learned about foraminiferal ecology. The goals of this chapter are (1) to provide a few examples from foraminifera studies, presenting possible use of foraminifera as bioindicators for the monitoring of transitional and marine ecosystems and (2) to highlight the importance of applying these organisms in environmental monitoring studies. A semienclosed coastal lagoon (Aveiro Lagoon; Portugal), an estuarine system (S√£o Sebasti√£o Channel; SE Brazil), a continental shelf sector (Campos Basin; SE Brazil), and a segment of continental slope (Campos Basin; SE Brazil) are used as examples.
Ecology And Applications Of Benthic Foraminifera
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Author : John W. Murray
language : en
Publisher: Cambridge University Press
Release Date : 2006-10-26
Ecology And Applications Of Benthic Foraminifera written by John W. Murray and has been published by Cambridge University Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006-10-26 with Science categories.
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Modern Foraminifera
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Author : Barun K. Sen Gupta
language : en
Publisher: Springer Science & Business Media
Release Date : 2007-05-08
Modern Foraminifera written by Barun K. Sen Gupta and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007-05-08 with Science categories.
From the reviews: "This is now the definitive, authoritative text on applied foraminiferal micropaleontology and should be in the library of all practicing micropaleontologists." (William A. Berggren, Woods Hole Oceanographic Institution in Micropaleontology, 47:1 (2001)"During the last 20 years there has been an explosion of publications about foraminifera from an amazing variety of disciplines: basic cell biology, algal symbiosis, biomineralization, biogeography, ecology, pollution, chemical oceanography, geochemistry, paleoceanography, and geology. This book summarizes contributions by leading researchers in these diverse fields. It is not just another text on the biology of foraminifera. Rather, Barun Sen Gupta has accomplished his objective to "write an advanced text for university students that would also serve as a reference book for professionals"." (Howard J. Spero, University of California at Davis in Limnology and Oceanography, 45:8 (2000).
Recent Foraminifera
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Author : E. Boltovskoy
language : en
Publisher: Springer Science & Business Media
Release Date : 2013-03-09
Recent Foraminifera written by E. Boltovskoy and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-03-09 with Science categories.
Conservation Palaeobiology Of Marine Ecosystems
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Author : R. Nawrot
language : en
Publisher: Geological Society of London Special Publications
Release Date : 2023-07-03
Conservation Palaeobiology Of Marine Ecosystems written by R. Nawrot and has been published by Geological Society of London Special Publications this book supported file pdf, txt, epub, kindle and other format this book has been release on 2023-07-03 with Science categories.
Conservation palaeobiology tracks the history of ecosystems based on the fossil record to guide conservation decisions and contribute to the theoretical foundations of conservation biology. The accelerating pace of global change requires better understanding of the long-term resilience and adaptive capacities of ecosystems. Fossil assemblages in outcrops and cores, together with surface accumulations of skeletal remains, represent unique archives of past ecosystem dynamics and baseline community states prior to anthropogenic impacts. However, as biological data retrieved from fossil and death assemblages cannot be treated in isolation, conservation palaeobiology integrates palaeontological and geological tools to account for the nature of the stratigraphic record. This volume brings together studies that demonstrate how combining marine palaeoecological records with other types of geohistorical data (taphonomic, sedimentological, geochronological, geochemical) can inform biodiversity conservation and ecosystem management. The papers highlight novel approaches and challenges in applying geohistorical data to conservation problems, discuss the limitations imposed by time averaging, and offer both deep- and near-time perspectives on conservation palaeobiology of marine ecosystems.
A Stratigraphical Basis For The Anthropocene
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Author : C.N. Waters
language : en
Publisher: Geological Society of London
Release Date : 2014-06-05
A Stratigraphical Basis For The Anthropocene written by C.N. Waters and has been published by Geological Society of London this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014-06-05 with Science categories.
Humankind has pervasively influenced the Earth’s atmosphere, biosphere, geosphere, hydrosphere and cryosphere, arguably to the point of fashioning a new geological epoch, the Anthropocene. To constrain the Anthropocene as a potential formal unit within the Geological Time Scale, a spectrum of indicators of anthropogenically-induced environmental change is considered, and shown as stratigraphical signals that may be used to characterize an Anthropocene unit, and to recognize its base. This volume describes a range of evidence that may help to define this potential new time unit and details key signatures that could be used in its definition. These signatures include lithostratigraphical (novel deposits, minerals and mineral magnetism), biostratigraphical (macro- and micro-palaeontological successions and human-induced trace fossils) and chemostratigraphical (organic, inorganic and radiogenic signatures in deposits, speleothems and ice and volcanic eruptions). We include, finally, the suggestion that humans have created a further sphere, the technosphere, that drives global change.
Oceanic Abstracts
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Author :
language : en
Publisher:
Release Date : 1997-10
Oceanic 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 1997-10 with Marine biology categories.