Relevant bibliographies by topics / Testate amoebae

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Academic literature on the topic 'Testate amoebae'

Author: Grafiati
Published: 4 June 2021
Last updated: 22 June 2024

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Journal articles on the topic "Testate amoebae"

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Liu, Bing, Robert K. Booth, Jaime Escobar, Zhiqiang Wei, Broxton W. Bird, Andres Pardo, Jason H. Curtis, and Jun Ouyang. "Ecology and paleoenvironmental application of testate amoebae in peatlands of the high-elevation Colombian páramo." Quaternary Research 92, no. 1 (February 18, 2019): 14–32. http://dx.doi.org/10.1017/qua.2018.143.

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AbstractWe investigated the ecology and paleoecology of testate amoebae in peatlands of the Colombian páramo to assess the use of testate amoebae as paleoenvironmental indicators. Objectives were to (1) identify environmental controls on testate amoebae, (2) develop transfer functions for paleoenvironmental inference, and (3) examine testate amoebae in a Holocene peat core and compare our findings with other proxy records. Results from 96 modern samples indicate that testate amoebae are sensitive to pH and surface moisture, and cross-validation of transfer functions indicates potential for paleoenvironmental applications. Testate amoebae from the Triunfo Peatland in the Central Cordillera provided a proxy record of pH and water-table depth for the late Holocene, and inferred changes were correlated with peat C/N measurements during most of the record. Comparison with a lake-level reconstruction suggests that at least the major testate amoeba–inferred changes were driven by climate. Our work indicates that testate amoebae are useful paleoenvironmental indicators in high-elevation tropical peatlands.
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Booth, Robert, and Jennifer Zygmunt. "Testate Amoebae as Paleoclimatic Proxies in Rocky Mountain Peatlands: A Case Study in the Greater Yellowstone Ecosystem." UW National Parks Service Research Station Annual Reports 26 (January 1, 2002): 85–96. http://dx.doi.org/10.13001/uwnpsrc.2002.3513.

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We investigated the potential of testate amoebae (Protozoa: Rhizopoda) for reconstructing past climate changes in the Rocky Mountain region. Our specific objectives were to determine environmental controls on modem testate amoeba distribution in Sphagnum-dominated peatlands of the region, reconstruct past temporal changes in testate amoebae from a Sphagnum-dominated peatland in southwestern Yellowstone National Park, and assess relationships between climate variability and testate amoebae for the past century. Our results indicate that substrate moisture is the dominant control on modem testate amoeba distribution in the region, consistent with studies from other regions. Temporal changes in testate amoebae reconstructed from a floating peat mat in the Greater Yellowstone Ecosystem show considerable variability during the past several hundred years, and variability during the past century was correlated with the instrumental record of drought at decadal timescales. The patterns suggest that sensitive paleoclimatic reconstructions are possible from floating mats in the region, and perhaps elsewhere. Testate amoebae from peatlands in the Rocky Mountains show great potential for reconstructing past climate variability, corroborating and extending records inferred from other proxies.
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Baković, Najla, Ferry Siemensma, Sanja Puljas, Robert Baković, Roman Ozimec, Ana Ostojić, and Zrinka Mesić. "First data on testate amoebae associated with the endemic cave bivalve Congeria jalzici Morton & Bilandžija, 2013 with a description of Psammonobiotus dinarica sp. nov." Subterranean Biology 45 (February 21, 2023): 53–74. http://dx.doi.org/10.3897/subtbiol.45.97105.

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Testate amoebae are phylogenetically a very diverse group of eukaryotic microorganisms. They can be found in marine and freshwater habitats and in soil. Some of these single-celled organisms inhabit both surface and cave habitats, but their diversity in caves has barely been explored. Recent studies in the Dinaric region imply that testate amoebae in caves show a high diversity. The aim of this study was to identify the alpha diversity of testate amoebae in the Lika region (Dinaric karst, Croatia) and to compare the habitats of different caves based on testate amoebae assemblages. In eight caves we found more than 40 testate amoebae taxa, including a new testate amoeba species, Psammonobiotus dinaricasp. nov. The greatest diversity of testate amoebae was found in Markov ponor (27 taxa). The Bray-Curtis Similarity Index showed that testate amoebae assemblages in caves inhabited by the endemic and endangered cave bivalve Congeria jalzici (Markov ponor, Dankov ponor and Dražice ponor) differ from caves not inhabited by this species. This differentiation is attributed to the impact of the sinking Lika river, which occasionally completely submerges these caves, creating specific habitats for eukaryotic microorganisms. This study contributes to our understanding of the diversity, biogeography and ecology of testate amoebae in caves, as well as providing further insight into the conditions that sustain populations of C. jalzici.
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Marcisz, Katarzyna, Krzysztof Buczek, Mariusz Gałka, Włodzimierz Margielewski, Matthieu Mulot, and Piotr Kołaczek. "Past testate amoeba communities in landslide mountain fens (Polish Carpathians): The relationship between shell types and sediment." Holocene 31, no. 6 (February 18, 2021): 954–65. http://dx.doi.org/10.1177/0959683621994647.

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Landslide mountain fens formed in landslide depressions are dynamic environments as their development is disturbed by a number of factors, for example, landslides, slopewash, and surface run-off. These processes lead to the accumulation of mineral material and wood in peat. Disturbed peatlands are interesting archives of past environmental changes, but they may be challenging for providing biotic proxy-based quantitative reconstructions. Here we investigate long-term changes in testate amoeba communities from two landslide mountain fens – so far an overlooked habitat for testate amoeba investigations. Our results show that abundances of testate amoebae are extremely low in this type of peatlands, therefore not suitable for providing quantitative depth-to-water table reconstructions. However, frequent shifts of dominant testate amoeba species reflect dynamic lithological situation of the studied fens. We observed that high and stable mineral matter input into the peatlands was associated with high abundances of species producing agglutinated (xenosomic) as well as idiosomic shells which prevailed in the testate amoeba communities in both analyzed profiles. This is the first study that explores testate amoebae of landslide mountain fens in such detail, providing novel information about microbial communities of these ecosystems.
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Zagumyonnaya, O. N., D. A. Philippov, D. G. Zagumyonnyi, A. A. Komarov, A. N. Tsyganov, and D. V. Tikhonenkov. "CHANGES IN TESTATE AMOEBA ASSEMBLAGES IN A SERIES OF DIFFERENT-TYPE AQUATIC AND TERRESTRIAL HABITATS OF WETLAND AND FOREST ECOSYSTEMS." Зоологический журнал 102, no. 1 (January 1, 2023): 3–21. http://dx.doi.org/10.31857/s0044513423010117.

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Patterns of changes in the species richness, abundance, community structure, and biomass of testate amoebae were studied in a series of different-type aquatic and terrestrial habitats along an interlake transect in the Tyumen Region. Altogether, 112 species and forms of testate amoebae, including subspecies, were identified. Micrographs of all species detected are given. The species Conicocassis pontiguasiformis (Beyens et al., 1986) Nasser and Anderson, 2015, previously described as an arctic endemic, was found in the south of Western Siberia for the first time. The species richness of testate amoeba assemblages is maximal in the periphyton. The highest values of species numbers and biomass were detected in the bottom detritus of the coastal part of a swamp lake. Testate amoeba assemblages in various habitats along the transect are divided into aquatic and terrestrial, according to the results of cluster and principal component analyses. The species composition of testate amoeba assemblages depended on substrate wetness, as well as the type of vegetation. The dominants in relative biomass were identified for aquatic, forest, and well-lit Sphagnum habitats.
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Kornecki, Krystyna M., Matthew S. Schuler, Miraim E. Katz, Rick A. Relyea, Francine M. G. McCarthy, Morgan F. Schaller, David P. Gillikin, et al. "The Canary in the Coal Mine: Testate Amoebae Record Anthropogenic Impacts in Sediments of Oligotrophic Lake George, NY, USA." Journal of Foraminiferal Research 50, no. 2 (April 1, 2020): 128–40. http://dx.doi.org/10.2113/gsjfr.50.2.128.

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ABSTRACT Lake George (NY) is surrounded by Forever Wild Forest in the Adirondack Park and has a Class AA Special water quality rating, yet lake monitoring has revealed increasing anthropogenic impacts from salt and nutrient loading over the past 30 years. To reconstruct anthropogenic influence on the lake (e.g., salt loading, eutrophication, climate warming), we characterized modern stable isotopes and testate amoeba and diatom assemblages in surface sediments from 33 lake-wide sites and compared their variability to 36 years of water-quality data. Linear regression analyses support testate amoebae as rapid responders and recorders of environmental change because taxa are strongly correlated with percent change of important water quality parameters. Our assessment indicates that: 1) Netzelia gramen is associated with aquatic plants and filamentous algae, making them a valuable aquatic plant/alga indicator, which is supported by the co-occurrence of the diatom Cocconeis spp.; 2) difflugids are generally good indicators of eutrophication, except for Difflugia protaeiformis; and 3) seasonal differences in water quality trends are reflected in the fossil record on decadal time scales. We show that testate amoebae are highly sensitive to small environmental changes in an oligotrophic lake and exhibit established relationships from eutrophic and mesotrophic lakes as well as new, likely oligotrophic-specific correlations. Correlation coefficients of water quality variables and strains within a species also illustrate gradational relationships, suggesting testate amoebae exhibit ecophenotypic plasticity. Diatom and testate amoeba assemblages categorize modern lakebed sites into four subgroups: 1) benthic macrophyte; 2) high nutrient; 3) high alkalinity; and 4) salt loading assemblages.
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Sysoev, Vlad V., Andrey N. Tsyganov, Fedor Y. Reshetnikov, and Yuri A. Mazei. "The Effects of Sampling Depth on Benthic Testate Amoeba Assemblages in Freshwater Lakes: A Case Study in Lake Valdayskoe (the East European Plain)." Diversity 14, no. 11 (November 12, 2022): 974. http://dx.doi.org/10.3390/d14110974.

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Testate amoebae are widely used as proxies in paleoecological reconstructions of lacustrine environments; however, our knowledge on their distribution along depth gradients are limited. This study investigates the distribution of benthic testate amoebae along a sampling depth gradient (0 to 57 m) and related environmental characteristics in Lake Valdayskoe, Russia. In total, 101 species belonging to twenty-one genera were identified. Four types of testate amoeba assemblages (littoral, sublittoral, bottom slope and profundal) were distinguished that corresponded well to the bottom zones of the lake. The results of redundancy analysis indicated that sampling depth, temperature, pH and bottom inclination significantly explained 40.2% of the total variance in the species composition. Temperature and sampling depth had the largest individual contributions of 19.2 and 7.4% (p < 0.001), respectively. The minimal values of species diversity were observed on the littoral and at the lower boundary of the thermocline. We estimated depth optima and ranges for the species with high occurrences and distinguish stenobathic and eurybathic species. These data might improve the interpretations of paleoecological records of subfossil testate amoeba assemblages in lacustrine surface sediments and serve as basis for the development of a transfer function for reconstruction of lake depths.
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Tsyganov, Andrey, Elena Malysheva, Yuri Mazei, K. Hapsari, Hermann Behling, Supiandi Sabiham, Siria Biagioni, and Valentyna Krashevska. "Species and Trait-Based Reconstructions of the Hydrological Regime in a Tropical Peatland (Central Sumatra, Indonesia) during the Holocene Using Testate Amoebae." Diversity 14, no. 12 (December 1, 2022): 1058. http://dx.doi.org/10.3390/d14121058.

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Paleoecological reconstructions of hydrological regimes in tropical peatlands during the Holocene are important for the estimation of their responses to changing environments. However, the application of some widely used proxies, such as testate amoebae, is hampered by poor knowledge of their morphology and ecological preferences in the region. The aim of this study is to describe the morphospecies composition of sub-fossil testate amoebae in deposits of a tropical peatland in Central Sumatra (Indonesia) during the Holocene and reconstruct the hydrological regime using morphospecies- and functional-trait-based approaches. In total, 48 testate amoeba morphospecies were observed. Based on morphospecies composition, we distinguished three main periods of peatland development (13,400–8000, 8000–2000, 2000 cal yr BP–present). The application of the morphospecies-based transfer function provided a more reliable reconstruction of the water regime in comparison to the functional trait-based one. The weak performance of the latter might be related to the poor preservation of shells and the greater variation in the functional traits in sub-fossil communities as compared to the training set and linear modeling approach. These results call for future studies on the functional and morphospecies composition of testate amoebae in a wider range of tropical peatlands to improve the quality of hydrological reconstructions.
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Golemansky, Vassil, and Rositsa Davidova. "Biodiversity, Distribution and Ecology of Testate Amoebae (Arcellinida and Euglyphida) from the Bulgarian Black Sea Coast and the related brackish lakes. A Synthesis." Acta Scientifica Naturalis 6, no. 2 (December 1, 2019): 14–39. http://dx.doi.org/10.2478/asn-2019-0016.

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Abstract The studies on the marine and freshwater testate amoebae of the Bulgarian Black Sea littoral and some related coastal brackish lakes are briefly reviewed. So far, a total of 184 species and subspecies of testate amoebae from 18 families and 45 genera from orders of Arcellinida and Euglyphida were published in national and international journals. The underground waters of the Bulgarian marine sand supralittoral are better studied than the related continental lakes. A total of about 45 species of marine interstitial testate amoebae are known, so far, and a big part of them were for the first time described from the Black Sea littoral. It’s interesting to note the presence in the marine underground waters of the Black Sea littoral of many freshwater testate amoebae also, considered by us as eurybionts. That is due of the low and variable salinity of the littoral Black Sea waters during the year. The presence of some psammobiotic testate amoebae as Psammonobiotus lineare and Corythionella georgiana in some related brackish lakes is also of ecological interest. The general conclusion of the present synthesis is that the testate amoebae fauna of the Bulgarian Black Sea coast and the related with it many brackish and freshwater littoral lakes is few known yet and need more active researches.
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Misailidis, Maria Laura, Nicolás Misailidis Strikis, Rubens Cesar Figueira, Renato Campello Cordeiro, Pedro Carlos Strikis, Leonardo Antonio Pregnolato, and Wânia Duleba. "TESTATEAMOEBAE AS BIO-INDICATORS OF CONTAMINATION BY TRACE ELEMENTS IN THE RESERVOIR OF SALTO GRANDE AMERICANA-SP, BRAZIL." Journal of Sedimentary Environments 2, no. 4 (January 31, 2018): 183–200. http://dx.doi.org/10.12957/jse.2017.32586.

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This work aims to evaluate the degree of sediment contamination and the response of Testate amoebae populations through a sediment core taken from the Salto Grande Reservoir (RSG), situated in Americana, in São Paulo State (SP), Brazil. It is based on the analysis of the trace elements geochemistry (by ICP-OES) and Testate amoebae data (by stereomicroscopic morphometric analysis). The indices of homogeneity and richness (Simpson 1-D and Margalef) were calculated. Sediment contamination was evaluated according to VGQS (TEL and PEL). The results evidenced that the sediments of Facies 3 are highly contaminated since the beginning of RSG filling. Contamination caused significant decline of Testate amoebae populations dimension and diversity. In sedimentary facies with lower concentrations of trace elements diversity and size of Testate amoebae populations are higher and are composed of different species. The results of this work indicate that Testate amoebae populations showed differentiated responses to different environmental conditions. So, these amoeboid protists can be considered good indicators of pollution caused by trace elements in fresh water aquatic environments.
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Dissertations / Theses on the topic "Testate amoebae"

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Vickery, Emma Jane. "Monitoring peatland damage and restoration using testate amoebae as indicator organisms." Thesis, University of Plymouth, 2005. http://hdl.handle.net/10026.1/2338.

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This thesis has examined the response of testate amoebae communities to restoration at three peatland sites in the UK. It builds upon the use of testate amoebae analysis as a palaeoenvironmental tool by exploring the hypothesis that testate amoebae respond to hydrological conditions in restored mires. Previous research has found that testate amoebae act as good proxies for hydrological condition of intact mires and past conditions but little has been done on their reaction to conditions at damaged sites in the UK. The research aimed to further the understanding of testate amoebae ecology including seasonal variability of communities, a poorly understood area. The secondary aim was to assess the potential for using testate amoebae as biological indicators of peatland damage and restoration. These aims were achieved through studies at three sites covering a range of damage commonly affecting UK sites. The experiments entailed repeated monitoring of a ditch blocking experiment at Coorn Rigg Moss which has been affected by peripheral forestry drains, a study of forest removal treatments at Flanders Moss and a study of rewetted cutover surfaces at Fenn's and Whixall Mosses. The results were analysed using a variety of statistical and multivariate methods. Data on water table and moisture conditions were also analysed and the results of the two were compared. 'Me results showed that testate amoebae communities responded to hydrological conditions but depth to water table was not always the primary factor affecting community composition. The results of the research indicate that testate amoebae analysis does have potential as a tool for monitoring peatland restoration but further research is necessary to fully understand the factors affecting distributions.
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Hendon, Dawn. "Robustness and precision of Holocene palaeoclimatic records from peatlands using testate amoebae." Thesis, University of Plymouth, 1998. http://hdl.handle.net/10026.1/756.

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This thesis represents the first attempt to use quantitative testate amoebae (Protozoa: Rhizopoda) analysis to measure hydrological fluctuations in British peatbogs over the Holocene. Changes in the fossil species assemblage are used to reconstruct the mean annual water table records at different locations on mire surfaces using a transfer function designed for application on oligotrophic peatlands. The transfer function was found to provide more precise reconstructions for depth to water table than percentage soil moisture. Multiple cores were extracted from three of the Border Mires; Coom Rigg Moss and Butterburn Flow (both intermediate ombrotrophic bogs) and The Wou (a minerogenic valley mire). Testate amoebae analysis of these cores was used to assess the variability of hydrological change at three spatial scales, in an attempt to separate autogenic and allogenic influences on site hydrology. The morphology of each mire ensured a strong link between water and prevailing climate (precipitation-evaporation balance). At the micro-scale (1-10m), within the centre of a mire, microtopography explains differences between the hydrological record for two cores. This is inferred because one of the cores appears to have been the location of an insensitive hummock over much of the period of accumulation. At the meso-scale (100-1000m), between the central mire expanse and the mire margins, synchronous changes can be identified, but the edges generally have lower water tables than the central portions of the mires. However, this may be attributable to autogenic factors acting over the whole site, as well as to climate. Between sites, at the macro-scale (1-10Iun), climatic influences can be clearly identified. The climatic signal is strongest in the centre of the mire and is more consistent between locations in the upper peats. If a hydrological shift is replicated in at least three cores from at least two sites, a climatic signal can be inferred. The testate amoebae preparation technique was also modified as part of this research to provide cleaner slides for more efficient counting. Testate amoebae analysis provides a new quantitative technique for reconstructing the palaeohydrology and from this, inferred palaeoclimatic conditions of ombrotrophic peatlands.
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Woodland, Wendy Ann. "Holocene palaeohydrology from testate amoebae analysis : developing a model for British peatlands." Thesis, University of Plymouth, 1996. http://hdl.handle.net/10026.1/841.

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Testate amoebae (Protozoa: Rhizopoda) are particularly abundant in peatlands. Previous studies have used testate amoebae in palaeoenvironmental studies, but have used qualitative data only, so that results are expressed only in terms of 'wet', 'dry' or 'moist'. This study uses testate amoebae to derive quantitative reconstructions of mire surface wetness for part of the Holocene and is split into two parts. The first part of this study modelled the responses of individual testate amoebae species to environmental variables on ombrotrophic mires, since the peatland-climate link makes these habitats the one of the most useful in palaeoclimate reconstructions. 163 samples of modern testate amoebae faunas were obtained from 9 ombrotrophic mires across Britain. Environmental variables (mean annual water table, moisture content, dissolved organic carbon, pH, Ca2+ , Mg2+ , SO42- , Cl-, conductivity and host plant species) were measured. A hydrological monitoring programme on an ombrotrophic mire on Dartmoor provided a detailed record of hydrology and selected water chemistry over a year and identified the season most representative of mean annual environmental conditions. Weighted averaging regression applied to the faunas provided absolute moisture content and mean annual water table optima for 38 common testate amoebae species. In the second part of the study weighted averaging calibration was used to derive transfer functions from the modern species' optima. From these, mean annual water table and substrate moisture content were reconstructed for the top 100 cm of a selected fossil peat core from Bolton Fell Moss, Cumbria. These reconstructions were compared with those derived from plant macrofossil and peat humification analyses. Testate amoebae provided a further insight into the decline of Sphagnum imbricaturn, clarified noisy areas of the existing palaeohydrological record and suggested that hydrological changes at Bolton Fell Moss were likely to have been gradual, rather than the sudden event implied by the plant macrofossil record. This study demonstrates the future potential of testate amoebae as palaeohydrological indicators. Expansion of the modern data set in terms of species composition and geographical extent, further applications of testate amoebae into multi-proxy palaeohydrological reconstructions and taxonomic refinements are suggested to improve the technique further.
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Geary, A. P. "Environmental controls on the spatial and temporal distribution of testate amoebae in two British minerotrophic mires." Thesis, University of the West of England, Bristol, 2014. http://eprints.uwe.ac.uk/23148/.

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This is the first study in the British Isles detailing the spatial and temporal distribution and controls on testate amoebae within minerotrophic brown-moss dominated mires. The study covers a full annual cycle at two mires, Max Bog in North Somerset and Shapwick Heath on the Somerset Peat Moors, between 1st June 2009 and 31st May 2010. Groundwater and host substrate samples were collected fortnightly and quarterly. Precipitation inputs compared well with 30-year averages, which revealed that total rainfall was typical, despite there being an unusually wet summer and dry spring recorded at each site. Water table depth responded differentially to precipitation at both sites, with Shapwick Heath far more responsive. This is likely to be a result of a combination of site topography and the nature of the underlying substrate. Spatially, each site had specific testate amoebae communities which were strongly linked to substrate. This was particularly evident at Max Bog. Spatial variability across both mires was driven by the relative abundance of a few key species. A larger number of more variable species then contributed at the individual biotope level. No vertical micro-distribution in the bryophytes was observed which was probably owing to the lack of both mixotrophic species and the moisture gradient. Temporal analysis showed that testate amoebae exhibited seasonal responses which were variable between the two sites and were represented by compositional change in the warmer periods of spring and summer. The strength and pattern of seasonality varied between communities inhabiting different biotopes. Seasonal shifts in bryophyte communities were generally represented by shifts in species dominance, while in other biotopes, seasonal variability was driven by species presence and absence. No vertical difference in seasonality was recorded in the bryophytes. Substrate variables were the principal controls on the broader species spatio-temporal distribution, particularly pH and Ca2+. There was very limited influence of both the water table and groundwater variables at Max Bog. Groundwater was far more influential at Shapwick Heath, although secondary to substrate variables. There was no consistent pattern of control between communities. Four test types were recorded overall. The numerically dominant test type at both sites was idiosomic. Although they exhibited some spatial variability, temporally they were stable. Major differences were due to relative fluctuations of xenosomes and protein-calcium tests. Vertically, there was no difference in test type composition. The dominance of the idiosome tests can have a significant impact on the quality of palaeo-environmental reconstruction in minerotrophic mires through the loss of ecological information and the potential underestimation of depth to water table (DWT). Furthermore, the use of testate amoebae in hydrological reconstructions in these systems may be severely limited, owing to the strong link with host substrate. The data suggest, however, that fen-dwelling testate amoebae may be useful in bio-monitoring, mire restoration and conservation research.
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Müller, Stefanie [Verfasser]. "Late Quaternary environmental changes in Yakutia (NE Siberia, Russia) - inferred from pollen and testate amoebae records / Stefanie Müller." Berlin : Freie Universität Berlin, 2009. http://d-nb.info/1027813399/34.

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Küttner, Anke. "Linking plant macrofossil, testate amoebae and geochemical element data from oceanic bogs in the British Isles to detect palaeoclimate change." Thesis, University of Aberdeen, 2013. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=203408.

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Bogs are sensitive palaeoclimate archives as they rely solely on atmospheric deposition for water and nutrients. A range of biological mire surface wetness proxies have been explored in previous studies, but linking geochemical elements to particular plant macrofossils and a quantitative water table depth reconstruction has not been attempted. The thesis aims to combine biological and geochemical data to evaluate the potential of these proxies when combined and to test the applicability of halogens as a palaeoclimate proxy. To do so, records of plant macrofossils, testate amoebae and geochemistry were reconstructed then ordinated from three bogs (Tyndrain, Wales; Raeburn Flow, Scotland; Annaholty, Ireland) along the western seaboard of the North Atlantic. Additionally, lead enrichment (Pb EF) and the pattern of lithogenic elements were measured to infer phases of anthropogenic activity. A testate amoebae based transfer function, used to identify water table changes, suggests regional climatic variability with only the ‘2650 BP wet shift' identifiable at all three sites. RBF and ANN show several shifts between wetter and drier conditions which appear to be in antiphase. In contrast, at TYN only drier phases were recorded during the Dark Ages and the Little Ice Age. No direct link between the halogens and mire surface wetness based on the testate amoebae was detectable. Factor analyses by principal components run on the halogens combined with Sphagnum mosses, monocots, unidentified organic matter, lithogenic elements and mire surface wetness to identify underlying factors driving their distribution, suggest inter-­‐site variability. It was not possible to identify a principal sink in terms of a specific moss species with any certainty, although a negative correlation with Sphagnum Section Acutifolia (dry indicator species) was found at ANN. Iodine appears to be more closely associated with the lithogenic elements, while bromine has similarities with both iodine and chlorine. iv The Pb EF results for Raeburn Flow and Annaholty are in agreement with patterns for historical global Pb production (i.e. Roman, Medieval and Industrial period enrichments are identifiable) and evidence for changes in land use. This limits the potential of lithogenic elements as palaeoclimatic indicators. Overall, the halogen pattern is inconclusive and requires further study, although for Annaholty a link between wetter conditions and an increase in halogens can be demonstrated.
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Barnett, Robert Langdon. "Holocene relative sea-level changes in south Hinnøya, Arctic Norway." Thesis, University of Plymouth, 2013. http://hdl.handle.net/10026.1/2771.

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This study develops techniques for the preparation and counting of testate amoebae for Holocene sea-level reconstructions. In addition, this study provides a ~3000 year relative sea-level reconstruction for south Hinnøya in the Vesterålen islands off mainland Norway, adding new data to a poorly defined period of the Holocene sea-level history of north-western Norway. This is important to quantify rates of glacial-isostatic adjustment (GIA), to refine GIA models, and to establish baseline (pre-industrial) rates of relative sea-level change. Surface sediments from two salt marshes (Storosen and Svinøyosen) in south Hinnøya are used to assess the effects of using different preparation procedures and count totals when analysing for testate amoebae. Analytical efficiency can be improved upon by using a mild alkali, chemical disaggregant (5 % KOH) to break up fibrous salt-marsh sediment and concentrate tests prior to counting. A count total of 100 individuals, rather than 150, can be used to make time gains with little or no effects on assemblages. Training sets of salt-marsh surface testate amoebae, foraminifera and elevational data are established for the two field sites. For testate amoebae, species – elevation relationships are constructed using regression modelling and applied to downcore fossil samples using a transfer function to derive estimates of sea level for the past ~100 years. The greater water depths reconstructed between ~3000 and ~100 years ago are not covered by modern foraminiferal training sets and are therefore estimated qualitatively from the fossil foraminiferal assemblages supplemented by information derived from fossil molluscs. Chronology is based on a combination of AMS14C, 210Pb, 137Cs and a suite of geochemical markers. At south Hinnøya, sea level has been falling at a rate of ~0.5 mm yr-1 over the last 3000 years.
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8

Stefan, Luketa. "Таксономија тестатних амеба које насељавају маховине на подручју Источне Херцеговине." Phd thesis, Univerzitet u Novom Sadu, Prirodno-matematički fakultet u Novom Sadu, 2020. https://www.cris.uns.ac.rs/record.jsf?recordId=115037&source=NDLTD&language=en.

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Докторска дисертација представља таксономску студију тестатних амеба Источне  Херцеговине  базирану  искључиво  на  резултатима  сопствених истраживања с обзиром да на овом подручју тестатне амебе до сада нису проучаване,  те  не  постоје  историјске  музејске  колекције.  На  подручју Источне Херцеговине регистровано је 40 врста тестатних амеба које су сврстане у 10 фамилија и један род без јасног места у класификационом систему.  Сви  регистровани  таксони  тестатних  амеба  су  нови  за  фауну Босне и Херцеговине. Укупно је анализирано 24.549 јединки, од чега су 23.242  јединке  припадале  групи  тестатних  амеба  са  лобоподијама (супергрупа  Amoebozoa),  а  1307  јединки  је  припадало  групи  тестатних амеба са филоподијама (супергрупа Cercozoa). Најзначајнији резултат ове дисертације  је  опис  пет  нових  врста  за  науку  које  припадају  родовимаCentropyxis, Heleopera и Nebela. Морфотип означен као C.  cf.  aerophila  се од врсте  C. aerophila  разликује по томе што се на крају љуштурице не налази пар крупних честица кварца,а и љуштурица је нешто дужа (46‒81 μm код врсте C. aerophila према 67‒ 88 μm код врсте C. cf. aerophila). Морфотип означен као C. cf. platystoma значајно се пре свега морфолошки разликује од врсте  C. platystoma, те је закључено да се ради о неописаној врсти.У оквиру рода Heleopera описан је нови морфотип сличан врсти H. rosea који  представља  нову  врсту  за  науку.  Морфометријске  разлике  су релативне, тј. нису строго дискриминаторне, те се морају комбиновати са морфолошким  разликама  које  су  такође  тешко  yочљиве.  Наиме,  поред разлике  у  боји  љуштурице,  најбољи  дискриминаторни  морфолошки карактер  је  општи  облик  љуштурице.  Љуштурице  врсте  H.  rosea  су робусног  облика,  док  су  љуштурице  врсте  Heleopera  cf.  rosea  знатно елегантније  ‒  уже  су  и  имају  облије  ивице.  Највеће  морфометријске разлике  у  индексним  карактерима  су  забележене  за  однос  ширине  и дужине љуштурице и однос ширине апертуре и ширине љуштурице.Морфотип  Nebela  cf.  collaris  се од  врсте  N. collaris  јасно разликује  пре свега  морфолошки  и  еколошки,  а  морфометријски  веома  мало.  Наиме, најважнија морфолошка одлика која морфотип  N.  cf.  collaris  раздваја од врсте  N.  collaris  су  таласасте  ивице  љуштурице,  а  еколошка  разлика  се јавља  у  смислу  да  врста  N.  collaris  насељава  зелене  маховине  док морфотип N. cf. collaris  насељава сфагнумске маховине. Морфотип N. cf. tincta  var. major  се од морфотипа N.  cf. collaris  разликује пре свега по јасно израженом сужењу у делу близу апертуре, тј. израженом врату. Такође, морфотип N. cf. tincta var. major никада нема таласасте ивице љуштурице,док  се  код  јединки  морфотипа  N.  cf.  collaris  ова  карактеристика  често јасно уочава.
Doktorska disertacija predstavlja taksonomsku studiju testatnih ameba Istočne  Hercegovine  baziranu  isključivo  na  rezultatima  sopstvenih istraživanja s obzirom da na ovom području testatne amebe do sada nisu proučavane,  te  ne  postoje  istorijske  muzejske  kolekcije.  Na  području Istočne Hercegovine registrovano je 40 vrsta testatnih ameba koje su svrstane u 10 familija i jedan rod bez jasnog mesta u klasifikacionom sistemu.  Svi  registrovani  taksoni  testatnih  ameba  su  novi  za  faunu Bosne i Hercegovine. Ukupno je analizirano 24.549 jedinki, od čega su 23.242  jedinke  pripadale  grupi  testatnih  ameba  sa  lobopodijama (supergrupa  Amoebozoa),  a  1307  jedinki  je  pripadalo  grupi  testatnih ameba sa filopodijama (supergrupa Cercozoa). Najznačajniji rezultat ove disertacije  je  opis  pet  novih  vrsta  za  nauku  koje  pripadaju  rodovimaCentropyxis, Heleopera i Nebela. Morfotip označen kao C.  cf.  aerophila  se od vrste  C. aerophila  razlikuje po tome što se na kraju ljušturice ne nalazi par krupnih čestica kvarca,a i ljušturica je nešto duža (46‒81 μm kod vrste C. aerophila prema 67‒ 88 μm kod vrste C. cf. aerophila). Morfotip označen kao C. cf. platystoma značajno se pre svega morfološki razlikuje od vrste  C. platystoma, te je zaključeno da se radi o neopisanoj vrsti.U okviru roda Heleopera opisan je novi morfotip sličan vrsti H. rosea koji  predstavlja  novu  vrstu  za  nauku.  Morfometrijske  razlike  su relativne, tj. nisu strogo diskriminatorne, te se moraju kombinovati sa morfološkim  razlikama  koje  su  takođe  teško  yočljive.  Naime,  pored razlike  u  boji  ljušturice,  najbolji  diskriminatorni  morfološki karakter  je  opšti  oblik  ljušturice.  LJušturice  vrste  H.  rosea  su robusnog  oblika,  dok  su  ljušturice  vrste  Heleopera  cf.  rosea  znatno elegantnije  ‒  uže  su  i  imaju  oblije  ivice.  Najveće  morfometrijske razlike  u  indeksnim  karakterima  su  zabeležene  za  odnos  širine  i dužine ljušturice i odnos širine aperture i širine ljušturice.Morfotip  Nebela  cf.  collaris  se od  vrste  N. collaris  jasno razlikuje  pre svega  morfološki  i  ekološki,  a  morfometrijski  veoma  malo.  Naime, najvažnija morfološka odlika koja morfotip  N.  cf.  collaris  razdvaja od vrste  N.  collaris  su  talasaste  ivice  ljušturice,  a  ekološka  razlika  se javlja  u  smislu  da  vrsta  N.  collaris  naseljava  zelene  mahovine  dok morfotip N. cf. collaris  naseljava sfagnumske mahovine. Morfotip N. cf. tincta  var. major  se od morfotipa N.  cf. collaris  razlikuje pre svega po jasno izraženom suženju u delu blizu aperture, tj. izraženom vratu. Takođe, morfotip N. cf. tincta var. major nikada nema talasaste ivice ljušturice,dok  se  kod  jedinki  morfotipa  N.  cf.  collaris  ova  karakteristika  često jasno uočava.
The  PhD  thesis  is  a  taxonomic  study  of  testate  amoebae  from  East Herzegovina based exclusively on the results of our own research, given that testate amoebae have not been studied in this region so far, and there are no historical museum collections. In the region  of East Herzegovina,40 testate amoeba species have been registered, which are classified into 10  families  and  one  genus  without  a  clear  place  in  the  classification system. All registered testate amoeba taxa are new to the fauna of Bosnia and Herzegovina.  A total of 24,549 individuals belonged to the group of testate  amoebae  with  lobopodia  (supergroup  Amoebozoa),  and  1307 individuals  belonged  to  the  group  of  testate  amoebae  with  filopodia (supergroup Cercozoa). The most significant results of this PhD thesis are the descriptions of five new species for science belonging to the genera Centropyxis, Heleopera, and Nebela. The morphotype  Centropyxis  cf.  aerophila  differs from  C. aerophila  in that  there  is  no  large  quartz  particles  at  the  shell  end,  and  the  shell   is slightly  longer  (46‒81  μm  in  C.  aerophila  versus  67‒88  μm  in  C.  cf. aerophila).  The  morphotype  C.  cf.  platystoma  differs  significantly morphologically  from  C.  platystoma,  so  it  was  concluded  that  it  is  an undescribed species. Within the genus  Heleopera  a new   morphotype similar to  H. rosea  has been  described,  representing  a  new  species  for  science.  Morphometric differences are relative, i.e. they are not strictly discriminatory, and must be combined with morphological differences that are difficult to detect. Namely, in addition to the difference in the color of the shell, the best discriminatory morphological character is the general shell shape. Shells of  H. rosea  are red and robust in shape, while shells of  H.  cf. rosea  are volet and much more  elegant ‒  they are narrower and have rounded edges. The  largest  morphometric  differences  in  the  index  characters  were observed for shell width/shell length ratio and aperture width/shell width ratio. The  morphotype  Nebela  cf.  collaris  clearly  differs  from  N.  collaris primarily  morphologically  and  ecologically,  but  morphometrically  very little.  Namely,  the  most  important  morphological  character  that  N.  cf. collaris separates from N. collaris are the wavy edges of the shell, and the  ecological difference occurs in the sense that  N. collaris  inhabits green mosses while   N. cf. collaris inhabits Sphagnum mosses. The morphotype N.  cf.  tincta  var.  major  from  the  morphotype  N.  cf.  collaris  differs primarily by a clearly pronounced narrowing in the part near the aperture, i.e. pronounced neck. Also, the morphotype N.   cf. tincta var. major never has a wavy edge of the shell, while in  N.  cf.  collaris  this feature is often clearly observed.
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Newton, Thomas Lee. "Holocene sea-level changes in the Falkland Islands : new insights into accelerated sea-level rise in the 20th Century." Thesis, University of Plymouth, 2017. http://hdl.handle.net/10026.1/9650.

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This thesis investigates sea-level changes in order to test the hypothesis that the main contribution to early 20th century sea-level rise was Northern Hemisphere land-based ice melt. Multiproxy sea-level reconstructions were established for the Falkland Islands, a location where models suggest sea-level rise from Northern Hemisphere ice melt produces the largest signal. The Falklands reconstruction indicated sea levels in the early 20th century accelerated compared to the long-term rate, synchronous with accelerations observed globally. The magnitude of the acceleration in the Falklands reconstruction was greater than Northern Hemisphere rates, consistent with the spatial pattern from a Northern Hemisphere melt source, but likely less than in New Zealand and Australia. It is therefore not possible rule out other contributions to the observed sea-level acceleration. The Falklands reconstruction indicated a rapid sea-level jump around 8.4 ka BP, synchronous with a jump observed in the Northern Hemisphere, which has been attributed to the sudden drainage of Laurentide proglacial lake Agassiz-Ojibway associated with the 8.2 ka BP climatic downturn. A maximum estimate of 0.89 ± 0.22 m for this jump in the Falklands is considerably less than estimates from Northern Hemisphere records. This difference could indicate additional contributions from the Southern Hemisphere are being recorded in the Northern Hemisphere signal. This thesis also focused on developing testate amoebae as sea-level indicators. In the Falklands, testate amoebae transfer functions were able to reconstruct sea level with precision (±0.08 m) comparable to diatoms (±0.07 m). However, preservation issues were indicated in the fossil testate amoebae assemblages which limits their use as tools for sea-level reconstruction. In addition, contemporary distributions of salt-marsh testate amoebae were investigated over one annual cycle. Seasonal variations in the live assemblages were observed to be asynchronous between taxa. Variations in the death assemblages were also observed which were correlated with variations in the live assemblages. This observation suggests the commonly applied assumption in palaeoenvironmental studies that analysing the death population negates temporal bias is invalid. Further research is required to investigate the impact these observed variations have on reconstructive performance.
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Lahr, Daniel José Galafasse. "Taxonomia dos Arcellinida Kent, 1880 (Protista: Ramicristates) do parque ecológico do rio Tietê." Universidade de São Paulo, 2006. http://www.teses.usp.br/teses/disponiveis/41/41133/tde-29092009-135940/.

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O presente trabalho explora os aspectos taxonomicos, ecologicos, morfologicos, biometricos e biogeograficos dos Arcellinida Kent, 1880 coletados no Parque Ecologico do Rio Tiete, Sao Paulo Brasil. Foram encontrados organismos pertencentes a cerca de 30 taxons nominais, no entanto, a revisao da literatura, novos dados morfologicos obtidos atraves do Microscopio Eletronico de Varredura e medidas biometricas realizadas com grande numero de individuos permitem afirmar que muitos destes taxons estao se referindo a mesma entidade na natureza. Logo, na presente pesquisa sao descritas, com detalhes de distribuicao geografica, morfologia ultra-estrutural, morfometria e ecologia, especies pertencentes a quatro familias e cinco generos: Difflugia corona Wallich, 1864; Difflugia gramen Penard, 1902; Difflugia lanceolata Penard, 1890; Difflugia claviformis Penard, 1899; Difflugia gigantea Chardez, 1967; Centropyxis aculeata (Ehrenberg, 1838); Netzelia wailesi (Ogden, 1980); Lesquereusia modesta Rhumbler, 1895; Lesquereusia mimetica Penard, 1911; Arcella hemisphaerica Perty, 1852; Arcella gibbosa Penard, 1890; Arcella discoides Ehrenberg, 1871 e Arcella brasiliensis Cunha, 1913. Sao discutidas inovacoes taxonomicas para que a comparacao de dados obtidos usando tecnicas atuais com aqueles reportados na literatura tradicional seja feita da maneira mais explicita possivel, de modo a delimitar melhor o conceito taxonomico de cada especie abordada.
The present survey explores the taxonomic, ecologic, morphologic, biometric and biogeographic aspects of the Arcellinida Kent, 1880 collected at the Ecological Park of the Tiete River, Sao Paolo Brazil. Around 30 nominal taxa were identified, however, a review of the literature and new morphologic data obtained via the Scanning Electron Microscope and biometric measures with a large number of individuals allow the inference that many of these taxa are referring to the same natural entity. Therefore, the present work describes species from four families and five genera, along with details about geographic distribution, ultra-structural morphology, morphometry and ecology: Difflugia corona Wallich, 1864; Difflugia gramen Penard, 1902; Difflugia lanceolata Penard, 1890; Difflugia claviformis Penard, 1899; Difflugia gigantea Chardez, 1967; Centropyxis aculeata (Ehrenberg, 1838); Netzelia wailesi (Ogden, 1980); Lesquereusia modesta Rhumbler, 1895; Lesquereusia mimetica Penard, 1911; Arcella hemisphaerica Perty, 1852; Arcella gibbosa Penard, 1890; Arcella discoides Ehrenberg, 1871 e Arcella brasiliensis Cunha, 1913. Taxonomic innovations are discussed in order to make comparison of recent data with those reported on traditional literature a more explicit practice, allowing a better understanding of each species taxonomic concept.
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Books on the topic "Testate amoebae"

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Clarke, K. J. Guide to the identification of soil protozoa - testate amoebae. Ambleside: CEH-Windermere in collaboration with the Freshwater Biological Association, 2003.

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Dawn, Hendon, Woodland Wendy A, and Quaternary Research Association, eds. The identification of testate amoebae (Protozoa: Rhizopoda) in peats. London: Quaternary Research Association, 2000.

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Chattopadhyay, Piyali. Morphology, morphometry, and ecology of moss dwelling Testate Amoebae (Protozoa : Rhizopodal) of North and North-East India. Kolkata: The Survey, 2003.

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An Atlas of Sphagnum-Dwelling Testate Amoebae in Bulgaria. Sofia, Bulgaria: Pensoft Publishers, 2019.

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Todorov, Milcho, and Nikola Bankov. An Atlas of Sphagnum-Dwelling Testate Amoebae in Bulgaria. Pensoft Publishers, 2019. http://dx.doi.org/10.3897/ab.e38685.

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Kirchman, David L. Predation and protists. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198789406.003.0009.

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Protists are involved in many ecological roles in natural environments, including primary production, herbivory and carnivory, and parasitism. Microbial ecologists have been interested in these single-cell eukaryotes since Antonie van Leeuwenhoek saw them in his stool and scum from his teeth. This chapter focuses on the role of protozoa (purely heterotrophic protists) and other protists in grazing on other microbes. Heterotrophic nanoflagellates, 3–5 microns long, are the most important grazers of bacteria and small phytoplankton in aquatic environments. In soils, flagellates are also important, followed by naked amoebae, testate amoebae, and ciliates. Many of these protists feed on their prey by phagocytosis, in which the prey particle is engulfed into a food vacuole into which digestive enzymes are released. This mechanism of grazing explains many factors affecting grazing rates, such as prey numbers, size, and composition. Ingestion rates increase with prey numbers before reaching a maximum, similar to the Michaelis–Menten equation describing uptake as a function of substrate concentration. Protists generally eat prey that are about ten-fold smaller than they are. In addition to flagellates, ciliates and dinoflagellates are often important predators in the microbial world and are critical links between microbial food chains and larger organisms Many protists are capable of photosynthesis. In some cases, the predator benefits from photosynthesis carried out by engulfed, but undigested photosynthetic prey or its chloroplasts. Although much can be learnt from the morphology of large protists, small protists (<10 μ‎m) often cannot be distinguished by morphology, and as seen several times in this book, many of the most abundant and presumably important protists are difficult to cultivate, necessitating the use of cultivation-independent methods analogous to those developed for prokaryotes. Instead of the 16S rRNA gene used for bacteria and archaea, the 18S rRNA gene is key for protists. Studies of this gene have uncovered high diversity in natural protist communities and, along with sequences of other genes, have upended models of eukaryote evolution. These studies indicate that the eukaryotic Tree of Life consists almost entirely of protists, with higher plants, fungi, and animals as mere branches.
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Book chapters on the topic "Testate amoebae"

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Charman, Dan J. "Testate amoebae." In Handbook of Sea-Level Research, 281–94. Chichester, UK: John Wiley & Sons, Ltd, 2015. http://dx.doi.org/10.1002/9781118452547.ch19.

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Ogden, Colin G. "Biomineralization in Testate Amoebae." In Skeletal Biomineralization: Patterns, Processes and Evolutionary Trends, 315. Washington, D. C.: American Geophysical Union, 2013. http://dx.doi.org/10.1029/sc005p0315.

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Smith, Humphrey Graham, Anatoly Bobrov, and Enrique Lara. "Diversity and biogeography of testate amoebae." In Protist Diversity and Geographical Distribution, 95–109. Dordrecht: Springer Netherlands, 2007. http://dx.doi.org/10.1007/978-90-481-2801-3_8.

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Sheth, Urjita. "Abundance Calculation of Naked and Testate Amoebae from Soil." In Springer Protocols Handbooks, 13–21. New York, NY: Springer US, 2024. http://dx.doi.org/10.1007/978-1-0716-3750-0_3.

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Ghosh, Anupam, and Helena L. Filipsson. "Applications of Foraminifera, Testate Amoebae and Tintinnids in Estuarine Palaeoecology." In Applications of Paleoenvironmental Techniques in Estuarine Studies, 313–37. Dordrecht: Springer Netherlands, 2017. http://dx.doi.org/10.1007/978-94-024-0990-1_13.

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Patterson, R. Timothy, Nawaf A. Nasser, Braden R. B. Gregory, Melody J. Gavel, Etienne Menard, Jennifer M. Galloway, and Helen M. Roe. "Arcellinida (Testate Lobose Amoebae) as Sensitive Bioindicators of Arsenic Contamination in Lakes." In Advances in Science, Technology & Innovation, 71–73. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-030-01683-8_15.

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Mitchell, Edward A. D., Daniel Gilbert, Alexandre Butler, Philippe Grosvernier, Christer Albinsson, Hàkan Rydin, Monique M. P. D. Heijmans, et al. "Can Testate Amoebae (Protozoa) and Other Micro-Organisms Help to Overcome Biogeographic Bias in Large Scale Global Change Research?" In Advances in Global Change Research, 301–10. Dordrecht: Springer Netherlands, 2001. http://dx.doi.org/10.1007/0-306-48051-4_29.

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Naik, Hetvi, Sapna Chandwani, and Natarajan Amaresan. "Methodology to Study Species Diversity of Naked Amoeba and Testate Amoeba." In Springer Protocols Handbooks, 37–42. New York, NY: Springer US, 2024. http://dx.doi.org/10.1007/978-1-0716-3750-0_7.

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Chandarana, Komal A., Hetvi Naik, and Natarajan Amaresan. "Enumeration of Testate Amoeba Through Direct Count from Soil." In Springer Protocols Handbooks, 49–53. New York, NY: Springer US, 2024. http://dx.doi.org/10.1007/978-1-0716-3750-0_9.

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LARA, Enrique, and Fatma GOMAA. "Symbiosis between Testate Amoebae and Photosynthetic Organisms." In Algal and Cyanobacteria Symbioses, 399–419. WORLD SCIENTIFIC (EUROPE), 2016. http://dx.doi.org/10.1142/9781786340580_0013.

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Conference papers on the topic "Testate amoebae"

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Ortiz, A. C. Tomasini, G. E. Moeller Chávez, M. Garzón-Zuñiga, and Y. Hornelas Orozco. "The Testate lobose amoebae in the wastewater treatment." In Proceedings of the II International Conference on Environmental, Industrial and Applied Microbiology (BioMicroWorld2007). WORLD SCIENTIFIC, 2009. http://dx.doi.org/10.1142/9789812837554_0073.

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Ishman, Scott, and Stephanie Jarvis. "EVIDENCE OF TESTATE AMOEBAE IN MIDDLE MISSISSIPPI RIVER FLOODPLAIN SEDIMENTS." In GSA Connects 2022 meeting in Denver, Colorado. Geological Society of America, 2022. http://dx.doi.org/10.1130/abs/2022am-378249.

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Lobegeier, Melissa K., and Christopher G. Robinson. "TAXONOMIC AND MINERALOGICAL ANALYSES OF AGGLUTINATED TESTATE AMOEBAE AND FORAMINIFERA AND THE APPLICATION OF TESTATE AMOEBAE IN ASSESSING THE SPREAD OF ATMOSPHERIC PARTICULATE MATTER." In GSA Annual Meeting in Indianapolis, Indiana, USA - 2018. Geological Society of America, 2018. http://dx.doi.org/10.1130/abs/2018am-323322.

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Kornecki, Krystyna, Miriam E. Katz, H. Chandler Rowell, and Tara M. Curtin. "IMPACTS OF MERCURY ON TESTATE AMOEBAE (ARCELLINIDA) OF CAYUGA LAKE, NY." In 53rd Annual GSA Northeastern Section Meeting - 2018. Geological Society of America, 2018. http://dx.doi.org/10.1130/abs/2018ne-311013.

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Robinson, Christopher, and Melissa K. Lobegeier. "THE POTENTIAL APPLICATIONS OF 3D MODELING IN TAXONOMIC ANALYSES OF TESTATE AMOEBAE." In GSA Annual Meeting in Indianapolis, Indiana, USA - 2018. Geological Society of America, 2018. http://dx.doi.org/10.1130/abs/2018am-322932.

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Kornecki, Krystyna M., Miriam E. Katz, Morgan F. Schaller, Francine M. G. McCarthy, and Curt Stager. "TESTATE AMOEBAE AND OTHER MICROFOSSILS OF LAKE GEORGE, NY: UNDERSTANDING THE MODERN ANALOG." In 51st Annual Northeastern GSA Section Meeting. Geological Society of America, 2016. http://dx.doi.org/10.1130/abs/2016ne-272103.

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Sackett, Stormy, Melissa Lobegeier, and Lauren E. Pearson. "USING TESTATE AMOEBAE AS BIOINDICATORS OF WATER QUALITY AND ECOSYSTEM HEALTH IN THE STONES RIVER WATERSHED IN MURFREESBORO, TN." In GSA Connects 2023 Meeting in Pittsburgh, Pennsylvania. Geological Society of America, 2023. http://dx.doi.org/10.1130/abs/2023am-395002.

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Lobegeier, Melissa K. "USING TESTATE AMOEBAE TO ANALYZE WATER QUALITY AND ENVIRONMENTAL CHANGES IN THE CLINCH AND POWELL RIVER WATERSHED, VIRGINIA OVER THE LAST 100 YEARS." In GSA Annual Meeting in Seattle, Washington, USA - 2017. Geological Society of America, 2017. http://dx.doi.org/10.1130/abs/2017am-307097.

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