Foraminiferal Response To Environmental Variability Along The California Margin
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Foraminiferal Response To Environmental Variability Along The California Margin
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Author : Catherine Van Wie Davis
language : en
Publisher:
Release Date : 2016
Foraminiferal Response To Environmental Variability Along The California Margin written by Catherine Van Wie Davis and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with categories.
Foraminifera, marine protists, are ubiquitous throughout the worlds oceans, contributing to pelagic and benthic ecosystems, global carbon cycling and in producing an extensive fossil record ideal for paleoclimate reconstruction as well as for exploring macroevolutionary questions. As such, the morphology, species assemblages and geochemistry of fossil foraminifera each contain extensive information about their growth and depositional environment. Here, the responses of foraminifera along the California Margin are examined across a range of naturally occurring hydrographic variables and at differing time scales. Chapter 1 explores the potential for size and weight change in fossil calcareous benthic foraminifera across a temporal change in oxygen and inorganic carbon. Previous work has demonstrated that changes in both oxygen and pH can impact foraminiferal calcification. Four species of benthic foraminifera from a sediment core in Santa Barbara Basin were weighed and measured against a backdrop of well-resolved, decadal scale Oxygen Minimum Zone and corresponding Carbonate Maximum Zone fluctuations at the site over the last 15,000 years. The resulting record shows long-term species-specific fluctuations in size and size-normalized weight. Chapter 2 focuses on the species level planktic foraminiferal response to seasonal upwelling on the Central California shelf. The region off of Bodega Head, California experiences wind-driven coastal upwelling which seasonally brings deeper, colder, nutrient rich, oxygen poor, and CO2 enriched waters to the near surface. A distinct difference is observed in the relative abundances of species found during and outside of upwelling season, with Globigerina bulloides associated with non-upwelled waters, Turborotalia quinqueloba and Neogloboquadrina pachyderma found primarily during upwelling season, and Neogloboquadrina incompa present year-round but more relatively abundant outside of upwelling season. Chapter 3 builds from previous observations of decreased foraminifera calcification in response to low pH or [CO32−] to further probe the physiologic response of foraminifera to these conditions. Foraminifer G. bulloides was subjected in the laboratory to an ecologically relevant range of environmental pH treatments (7.5-8.3) and evaluated on both respirometry and calcification metrics. Results indicated a decrease in calcification with decreasing pH and reduced shell-repair at low pH, but a non-linear respiratory response, with metabolic depression at low pH, and the highest respiration rates observed at pH ~8.1. Chapter 4 presents species-specific Mg/Ca:temperature relationships for the cold-water planktic foraminifera species N. pachyderma and N. incompta. No significant pH effect on Mg/Ca is demonstrated at 12 °C in N. incompta. However, N. incompta did form a low Mg/Ca “crust” in culture at the same temperature as ontogenetic (higher Mg/Ca) calcite. This chapter therefore proposes a Mg/Ca:temperature relationship exclusive to ontogenetic calcite and presents a corroboration of this approach in fossil N. pachyderma and N. incompta. Through these chapters, the foraminiferal response in terms of morphology, species compositions, physiology and geochemistry is documented with respect the the range of conditions relevant to the modern California Margin. The results of each of these approaches inform the paleoceaongraphic interpretation of this and analogous regions, highlighting the importance of approaching paleoceaongraphic interpretations with species and regional specificity to the greatest extent possible. This necessitates relating the morphology and geochemistry of foraminiferal species to the environment in which they are endemic, and taking into account the ecology, physiology and life history or foraminifera populations when interpreting paleoclimate proxies.
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.
The Faunal Response Of California Continental Margin Benthic Foraminifera To The Oceanographic And Depositional Events Of The Neogene
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Author : Gregory Howard Blake
language : en
Publisher:
Release Date : 1985
The Faunal Response Of California Continental Margin Benthic Foraminifera To The Oceanographic And Depositional Events Of The Neogene written by Gregory Howard Blake and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1985 with Benthos categories.
Foraminiferal Proxy Response To Ocean Temperature Variability And Acidification Over The Last 150 Years In The Santa Barbara Basin California
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Author :
language : en
Publisher:
Release Date : 2018
Foraminiferal Proxy Response To Ocean Temperature Variability And Acidification Over The Last 150 Years In The Santa Barbara Basin California written by 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.
Planktonic Foraminifera In The California Current
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Author : David Buursma Field
language : en
Publisher:
Release Date : 2004
Planktonic Foraminifera In The California Current written by David Buursma Field and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with categories.
Ecology And Palaeoecology Of Benthic Foraminifera
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Author : John W. Murray
language : en
Publisher: Routledge
Release Date : 2014-10-13
Ecology And Palaeoecology Of Benthic Foraminifera written by John W. Murray and has been published by Routledge this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014-10-13 with Science categories.
This is an important and authoritative review of foraminiferal ecology, the first for over a decade. Professor Murray relates ecological data on living forms of foraminifera to the palaeoecology of fossil species, and defines in detail areas of global distribution.
Biogeochemical Controls On Palaeoceanographic Environmental Proxies
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Author : William E. N. Austin
language : en
Publisher: Geological Society of London
Release Date : 2008
Biogeochemical Controls On Palaeoceanographic Environmental Proxies written by William E. N. Austin 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 2008 with Medical categories.
Most of our information about the evolution of Earth's ocean-climate system comes from the analysis of sediments laid down in the past. For example, the microfossil assemblage reflects the temperature, salinity and nutrient abundance of the water in which the organisms lived, while the chemical and isotopic composition of biogenic carbonates may be used to reconstruct past variations in the operation of the carbon cycle, as well as changes in ocean circulation. Nevertheless, understanding the link between these sediment variables (or 'proxies') and environmental conditions is not straightforward. This volume adopts a novel approach by bringing together palaeontologists, geochemists and palaeoceanographers, who contribute evidence that is required to better constrain these proxies. Topics include: (i) processes of biomineralization, and their effect on the chemical and isotopic composition of different organisms; (ii) proxy validation, including field, laboratory and theoretical studies; (iii) the links between modern and fossil organisms
Benthic Foraminiferal Response To Late Quaternary Variations In Surface Water Productivity And Oxygenation In The Northern Arabian Sea
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Author : Maryke den Dulk
language : en
Publisher:
Release Date : 2000
Benthic Foraminiferal Response To Late Quaternary Variations In Surface Water Productivity And Oxygenation In The Northern Arabian Sea written by Maryke den Dulk and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2000 with Benthos categories.
Planktic Foraminifers In The Modern Ocean
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Author : Ralf Schiebel
language : en
Publisher: Springer
Release Date : 2017-02-17
Planktic Foraminifers In The Modern Ocean written by Ralf Schiebel and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-02-17 with Science categories.
This book provides a comprehensive overview of the taxonomy, biology, sedimentation, and carbonate geochemistry of modern species. Students, early career and advanced scientists alike will profit from a broad synthesis of the current understanding of planktic foraminifers as an ecological indicator, biogeochemical factories, and proxies in paleoceanography. The classification of modern species is amply illustrated with electron and light microscope images of morphotypes, addresses the state-of-the-art of molecular genetics of species, and provides a detailed guide for any laboratory analyses. The biology of planktic foraminifers is extensively discussed in chapters dedicated to the cellular ultrastructure, nutrition, symbionts, reproduction, ontogeny, and test architecture. Building on the biological prerequisites, the distribution of planktic foraminifers is discussed at regional to global scale. The geochemistry and sedimentation of tests are considered in relation to the ecology of the living animal. In the final chapter, which examines the most common methods in planktic foraminifer research, hands-on information is provided on sampling, processing and analyzing samples in the laboratory, as well as selected established methods for data interpretation. The various topics discussed in this book are aimed at the application of planktic foraminifers as sensitive indicators of the changing climate and marine environment.
Foraminiferal Assemblages Preserved In Surface Sediments Correspond To Multiple Environmental And Preservation Variables
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Author : Ann E. Morey Ross
language : en
Publisher:
Release Date : 2003
Foraminiferal Assemblages Preserved In Surface Sediments Correspond To Multiple Environmental And Preservation Variables written by Ann E. Morey Ross and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with Chemical oceanography categories.
Here we investigate the relationships between modern foraminiferal assemblages from Atlantic and Pacific surface sediment samples and multiple environmental properties including water column and preservation variables using Canonical Correspondence Analysis (CCA). CCA finds two fauna] dimensions that are highly correlated to the environmental variables included in the analysis, and then selects the best linear combination of environmental variables to explain sample positions along these dimensions. The first dimension (30.4% of the faunal variance) is related primarily to mean annual sea-surface temperature (SST, r = -0.955). Salinity, or some property correlated to it, also influences CCA Axis 1 within the tropics. The second dimension (7.9% of the faunal variance) accounts for environmental variability associated with an inverse relationship between SST and surface salinity, including variability in pycnocline phosphate concentration, range in nitrate concentration, water depth and chlorophyll. No evidence is found for a significant influence of selective dissolution, suggesting that carbonate ion concentration cannot be estimated for foraminiferal assemblages Our results support the use of foraminiferal assemblages preserved in deep-sea sediments to estimate SST. We use our results to develop a CCA-based transfer function using the relationship between SST and CCA Axis 1. We tested this new estimation method by reconstructing modern and LGM SSTs, and the SSTs down an eastern tropical Pacific sediment core, RC13-110.