Relationships Between The Distribution Of Selected Taxa Of Recent Benthic Foraminifera And Measured Environmental Parameters In Timbalier Bay Louisiana
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Relationships Between The Distribution Of Selected Taxa Of Recent Benthic Foraminifera And Measured Environmental Parameters In Timbalier Bay Louisiana
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Author : Christopher L. Ostrom
language : en
Publisher:
Release Date : 1974
Relationships Between The Distribution Of Selected Taxa Of Recent Benthic Foraminifera And Measured Environmental Parameters In Timbalier Bay Louisiana written by Christopher L. Ostrom and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1974 with Foraminifera categories.
Long Term Environmental Effects Of Offshore Oil And Gas Development
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Author : D.F. Boesch
language : en
Publisher: CRC Press
Release Date : 1987-03-24
Long Term Environmental Effects Of Offshore Oil And Gas Development written by D.F. Boesch and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 1987-03-24 with Architecture categories.
Long-term Environmental Effects of Offshore Oil and Gas Development contains 14 chapters by different authors which focus on the US.
Rice University Studies
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Author :
language : en
Publisher:
Release Date : 1979
Rice University Studies written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1979 with categories.
Master S Theses And Doctoral Dissertations In The Pure And Applied Sciences
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Author :
language : en
Publisher:
Release Date : 1975
Master S Theses And Doctoral Dissertations In The Pure And Applied Sciences written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1975 with Dissertations, Academic categories.
Biodiversity And Distribution Of Benthic Foraminifera In Harrington Sound Bermuda
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Author : Nam Le
language : en
Publisher:
Release Date : 2019
Biodiversity And Distribution Of Benthic Foraminifera In Harrington Sound Bermuda written by Nam Le and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019 with Bermuda Islands categories.
Harrington Sound, Bermuda, is a nearly enclosed lagoon acting as a subtropical/tropical, carbonate-rich basin in which carbonate sediments, reef patches, and carbonate-producing organisms accumulate. Here, one of the most important calcareous groups is the Foraminifera. Analyses of common benthic orders, including miliolids (Quinqueloculina and Triloculina spp.) and rotaliids (Homotrema rubrum, Elphidium spp., and Ammonia beccarii), are essential in understanding past and present environmental conditions affecting the island's coastal environment. These taxa have been studied previously; however, factors explaining their individual patterns of abundance in the Sound are not well detailed. The goal of this study is to understand foraminiferal assemblage trends by assessing parameters including depth, test-size, temperature, salinity, dissolved oxygen, pH, and variable interactions. The results of this study can serve as a baseline model for Neogene carbonate lagoons that accumulated Foraminifera under different climate conditions. Benthic sediment samples were collected at depths ranging from 3 m to 24 m using an Ekman dredge, while water-quality data were collected using an In-Situ SMAR Troll MP probe. Due to the limited test-size of these taxa, four size fractions were examined (1/2+ mm, 1/4 -1/2 mm, 1/8 - 1/4 mm, 1/16 - 1/8 mm). Dead-test and fragment counts were performed after randomizing sample selections with a sediment splitter. Using RStudio and ArcMap, basic, advanced statistical, and geospatial analyses were conducted on each taxon (segregated by test and fragment size) to examine depth-profile and spatial relationships between count data, physical, and geochemical factors. Results from multiple quantile regression, nonparametric MANOVA, and geospatial modeling show that each taxon, under identical depth and spatial constraints, can be accounted for by different functional combinations of variables. In testing multivariate response and factorial influence, initial relative effect estimations and subset algorithms from nonparametric MANOVA effectively quantify abundance patterns. Spatial maps of all test-size fractions of Quinqueloculina & Triloculina spp. showed that these species were concentrated in deeper and colder regions in Harrington Sound, which disagreed with previously reported studies. Fragment counts of H. rubrum increased in shallower and warmer regions, with lower salinity, higher dissolved oxygen, and higher pH. Both Elphidium spp. and A. beccarii test counts were found be concentrated in areas with high salinity, although there were several anomalies across test-size fractions for both taxa. Although there was a limited number of sampling points and measurements, the study's statistical methods proved to be effective in modeling the distribution of test-size concentrations within a complex system. Thus, as one of the few pioneering studies to cumulatively use predictive, multivariate, and geospatial models, this study urges future research studies to push beyond conventional, quantitative methodological boundaries regarding similar inquiries.
Using Foraminiferal Assemblages To Reconstruct Climate Change In The Northwestern Weddell Sea Antarctic Peninsula
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Author : Anastasia Kyrmanidou
language : en
Publisher:
Release Date : 2018
Using Foraminiferal Assemblages To Reconstruct Climate Change In The Northwestern Weddell Sea Antarctic Peninsula written by Anastasia Kyrmanidou and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018 with Antarctic Peninsula (Antarctica) categories.
The overall objective of this dissertation was to investigate the benthic foraminiferal assemblage dynamics of the northwestern part of the Weddell Sea and to utilize them as oceanographic proxies. Spatial and temporal patterns of foraminiferal assemblages are correlated with other proxies in order to reconstruct and better understand Antarctic Peninsula (AP) paleoenvironmental changes, particularly those pertaining to bottom-water circulation, glacial fluctuations, and biological productivity on the eastern margin of the AP (EAP). This area in the northeast Antarctic Peninsula has experienced significant environmental change evidenced by the collapse of both Larsen-A and Larsen -B ice shelves, involving various preconditioned and sequential transitions in cryosphere and ecosystem dynamics. The first project (Chapter 3) presents an expanded foraminiferal and diatom record from Perseverance Drift, northeastern AP. Using benthic foraminifera and diatoms as paleoenvironmental proxies for paleoproductivity and sea ice conditions in the area, a record extending back to 3400 yr BP, constrained via radiocarbon dating of biogenic calcite was produced. The variability of the recor was compared with existing paleoenvironmental marine records of the AP, which recognize Holocene hypsithermal and cooling events, such as the Mid-Holocene Climatic Optimum and the Neoglacial period. Overall, Holocene climatic variability is complex, with warm and cool phasing occurring at different rates and at different times across the AP (Bentley et al., 2009). Based on the foraminiferal and diatom record of Perseverance Drift, this study recognizes two main intervals of climatic variability. The basal unit of the composite core, characterized by high abundances of Globocassidulina spp. Foraminiferal Assemblage (FA), indicates incursions of Weddell Sea Transitional Water over the drift site. This interval implies a period of 'freshening' of the water column, coinciding with an open-marine or seasonally open-marine environment during the middle-to-late Holocene Climatic Optimum. The upper unit of the composite core displays characteristics of slightly colder climatic conditions as indicated by the absence of calcareous foraminifera Globocassiulina spp. FA and the pronounced presence of agglutinated FAs that are indicative of the presence of heavy sea ice. Therefore, this interval is interpreted to represent the onset of Neoglaciation at the northeastern tip of the AP. The main objective of the second project (Chapter 4) was to understand modern trends in the foraminiferal-environmental relationship in order to be able to accurately interpret the environmental conditions represented in paleo-records from the eastern part of the AP (EAP), and more specifically the formerly ice shelf-covered Larsen A embayment. This project compared already published data reporting on modern foraminiferal assemblage distributions from the Larsen A embayment (collected in March 2000) with new data reporting on modern foraminiferal assemblage distributions (collected in March 2012) from approximately the same sampling locations that follow an inshore to offshore transect designed to serve as a spatial approximation for temporal differences in ice shelf coverage over the past several decades. Additionally, down-core (2012) samples were analyzed and compared with the modern datasets in an attempt to obtain longer-term information regarding the foraminiferal communities' status pre-collapse. The main difference within the span of 12 years separating the sampling efforts is the removal of the calcareous component from the foraminiferal dataset in stations from the inner part of the embayment, situated closer to the ice shelf edge. The down-core foraminiferal data, seem to be following the same pattern as observed in the modern datasets, therefore, providing proof of the concept that distance from the ice shelf edge, in combination with the effects of taphonomical dissolution and locally increased food availability, is a factor that can structure the benthic foraminiferal community composition in environments characterized by ice shelf collapse, such as the Larsen A embayment. The third project (Chapter 5) provides an analysis of foraminiferal assemblages collected from sediment core GC16B near the northern margin of Larsen C ice shelf. Foraminiferal analysis of samples collected from this core revealed a diverse assemblage of calcareous benthic foraminiferal taxa in the upper 20 cm of the core, with very low contribution from agglutinated forms. Owing to the very low absolute diatom abundance values that characterize the core, the high abundance of planktonic foraminiferal taxa relative to benthic foraminiferal taxa, and the dominance patterns of the benthic foraminiferal taxa, different hypothesis pertaining to the source of productivity in this sub-ice shelf environment have been employed involving the transport of advected food supply from the open Weddell Sea and the response of the foraminiferal fauna to less productive (than labile) organic matter as their food source.
Distribution Of Recent Benthic Foraminifera Off The Pacific Coast Of Mexico And Central America
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Author : Stephen J. Culver
language : en
Publisher:
Release Date : 1987
Distribution Of Recent Benthic Foraminifera Off The Pacific Coast Of Mexico And Central America written by Stephen J. Culver and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1987 with Science categories.
A Modern Distribution Of Foraminifera To Reconstruct Environmental Change Offshore Galveston Bay Texas
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Author : Solveig H. Schilling
language : en
Publisher:
Release Date : 2022
A Modern Distribution Of Foraminifera To Reconstruct Environmental Change Offshore Galveston Bay Texas written by Solveig H. Schilling 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.
Sand is an important resource for coastal engineering. In Texas, many offshore sand deposits are found buried in Holocene fluvial sediments or estuarine environments like tidal channels or bayhead, flood, and ebb tide deltas. Exploring for these resources requires a comprehensive understanding of the depositional system in which they are buried. The distribution of benthic foraminifera can be used to reconstruct the paleoenvironment of sand-bearing Holocene estuary deposits. The Gulf of Mexico foraminifera have long been tied to specific environments, and facies in which one genera of benthic foraminifera is most abundant (i.e., the predominance facies) represent a promising technique to reconstruct paleoenvironment in Holocene cores. Although predominance facies have been well documented in Galveston Bay, to date, there are no equivalent records directly offshore for comparison, leaving the inner shelf assemblage unconstrained. Additionally, no direct comparisons have been made between ancient estuary assemblages and the modern living assemblages in Galveston Bay. To address this knowledge gap, this project examines the environmental evolution of the Trinity River estuary using benthic foraminifera and core data. The foraminifera trends offshore Galveston Bay show a greater diversity compared to estuary samples, which is likely driven by increased salinity on the inner shelf compared to Galveston Bay. The increased diversity of inner shelf assemblages compared to those of the bay can be used for recognizing offshore assemblages as distinct from estuarine samples in core data. Additionally, the comparison of living and Holocene estuary populations shows ancient samples with much higher dominance of Elphidium than is observed in the modern bay. This non-analogue population suggests environmental conditions (likely salinity) in the Holocene Trinity River estuary varied significantly from modern conditions implying a recent environmental change in the bay
Distribution And Diversity Of Benthic Foraminifera Within The Nearshore Ridge Complex Off Pompano Beach Broward County Florida
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Author : Caitlin M. Hanley
language : en
Publisher:
Release Date : 2016
Distribution And Diversity Of Benthic Foraminifera Within The Nearshore Ridge Complex Off Pompano Beach Broward County Florida written by Caitlin M. Hanley and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with Coastal ecology categories.
Benthic foraminifera are exceptional organisms with distinctive features that allow for interpretation of both past and present environmental conditions. Some benthic foraminifera are widely distributed while some are restricted to specific environments due to their way of life. Foraminiferal assemblages south of Biscayne Bay and north of Cape Canaveral have previously been investigated; however, a gap exists in data covering a transitional zone along the Florida coast between the tropical waters of the western Atlantic and the cooler coastal waters along the North American coast. The purpose of this study was to collect baseline data on the benthic foraminifera of the small marine environment off of Pompano Beach that falls within this zone. This environment has a very particular relict reef system that includes a near-shore ridge complex, the unique foraminiferal assemblage of which has not been documented. Thirteen rubble samples were collected from this near shore ridge complex between October 2013 and April 2015 from depths of 2.5m – 9m. Abundances and diversity indices were calculated, and multivariate analysis and SHEBI analysis carried out to summarize baseline data for the area. Substrate types and seasonal collections were compared with foraminiferal abundances to determine if benthic foraminifera diversity varied between the four substrate types found on the near-shore ridge and between wet and dry seasons in Florida. Results revealed a variation in abundances for both substrates and seasons with the dominant genera being Quinqueloculina, Laevipeneroplis, and Archaias. Multivariate analysis displayed dissimilarities between substrates colonized by corals and those that were uncolonized. Comparison of studies from surrounding areas revealed fewer, however similar, species and different dominant genera. Overall, this area has proven to be a different environment compared to surrounding coastal areas and merits further investigation.
Ecology And Palaeoecology Of Benthic Foraminifera
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Author : John William Murray
language : en
Publisher:
Release Date : 1991
Ecology And Palaeoecology Of Benthic Foraminifera written by John William Murray and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991 with Benthos 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.