Journal of Foraminiferal Research最新文献

Hochstetter’s fossil foraminiferal collections on the Novara Expedition, 1857–1859 霍赫斯泰特在 1857-1859 年诺瓦拉探险队中采集的有孔虫化石

IF 0.9 4区地球科学

Journal of Foraminiferal Research Pub Date : 2024-07-01 DOI: 10.61551/gsjfr.54.3.271

Bruce W. Hayward, S. Nolden

{"title":"Hochstetter’s fossil foraminiferal collections on the Novara Expedition, 1857–1859","authors":"Bruce W. Hayward, S. Nolden","doi":"10.61551/gsjfr.54.3.271","DOIUrl":"https://doi.org/10.61551/gsjfr.54.3.271","url":null,"abstract":"\u0000 Ferdinand Hochstetter was the geologist on the Austrian trans-global Novara Expedition (1857–1859). During these travels he collected sedimentary rock samples from three places that he recognised in the field to have rich foraminiferal faunas and on his return to Austria they were studied by three foraminiferal specialists. Conrad Schwager (1866) described 97 new species (79 currently accepted) from a Pliocene lower bathyal-abyssal fauna from Car Nicobar, India. This was the earliest description of cosmopolitan, deep-water Neogene foraminiferal species and thus includes descriptions of many species widely recognised today such as Lobatula wuellerstorfi, Cibicidoides cicatricosus, Neogloboquadrina conglomerata, Pyrgo murrhina and many of the more common elongate taxa that became extinct during the Last Global extinction in the Mid Pleistocene Climate Transition. Felix Karrer (1864) and Guido Stache (1864) described 19 foraminiferal species (16 currently accepted) from the early Miocene and 126 species (50 currently accepted) from the Oligocene of the North Island of New Zealand, respectively. Among the species described from Hochstetter’s collections are the type species of 15 genera that are accepted today. Three species have been named hochstetteri from these localities. Because of their significance, all these new species from New Zealand and India were revised and typified in monographs by Hornibrook (1971) and Srinivasan & Sharma (1980), respectively.","PeriodicalId":54832,"journal":{"name":"Journal of Foraminiferal Research","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141842835","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Heterogeneity among juvenile megalospheres in Peneroplis pertusus (Forskål) from the Line Islands (Pacific Ocean): Size range, morphotypes, and test deformations 太平洋利恩群岛 Peneroplis pertusus (Forskål) 幼体巨球之间的异质性：尺寸范围、形态和测试变形

IF 0.9 4区地球科学

Journal of Foraminiferal Research Pub Date : 2024-07-01 DOI: 10.61551/gsjfr.54.3.264

Martin R. Langer, Yaroslav S. Trubin, Skye Yunshu Tian, Susan T. Goldstein

引用次数: 0

Morphological deformities in benthic foraminiferal assemblages from shallow marine and lagoonal environments of the western Arabian Gulf 阿拉伯湾西部浅海和泻湖环境中底栖有孔虫集合体的形态畸变

IF 0.9 4区地球科学

Journal of Foraminiferal Research Pub Date : 2024-07-01 DOI: 10.61551/gsjfr.54.3.290

S. Prayudi, Bassam Tawabini, Asmaa Korin, Michael A. Kaminski

引用次数: 0

Inhabitation of bathyal hydrocarbon seeps by early-branching benthic foraminifera: Implications for Neo-Proterozoic ecosystem functioning 早期分支底栖有孔虫在深海碳氢化合物渗流中的栖息：对新元古代生态系统功能的影响

IF 0.9 4区地球科学

Journal of Foraminiferal Research Pub Date : 2024-07-01 DOI: 10.61551/gsjfr.54.3.217

Shari M. Rohret, Joan M. Bernhard

{"title":"Inhabitation of bathyal hydrocarbon seeps by early-branching benthic foraminifera: Implications for Neo-Proterozoic ecosystem functioning","authors":"Shari M. Rohret, Joan M. Bernhard","doi":"10.61551/gsjfr.54.3.217","DOIUrl":"https://doi.org/10.61551/gsjfr.54.3.217","url":null,"abstract":"\u0000 Little is known about mechanisms allowing agglutinated and thecate (i.e., organic-walled) foraminifera associated with extreme environments to survive. Here, we present cytological observations of organic-walled and agglutinated monothalamid and milioline tubothalamids collected from sulfur-oxidizing microbial mats of Gulf of Mexico hydrocarbon seeps. This is the first ultrastructural analysis of allogromids, a basal group of organic-walled thecate foraminifera, from seeps. We show most allogromids contained numerous ingested bacteria of various forms; organelle abundance and distribution varied among their morphotypes. Saccaminids (agglutinated monothalamids) had abundant phagocytosed bacteria, including putative methanotrophic and sulfur-oxidizing bacteria, indicating foraminiferal activity in seeps. A porcelaneous tubothalamid morphotype contained phagocytosed bacteria of one morphology, suggesting food selectivity. Increasing our knowledge of the cytology and ecology of these modern representatives of early-evolving foraminifera could help elucidate their evolutionary history. Thus, we augment understanding of extremophile foraminifera, adding to our burgeoning understanding of microeukaryote protists and microfossil adaptations.","PeriodicalId":54832,"journal":{"name":"Journal of Foraminiferal Research","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141843511","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Why Amphistegina lobifera, a tropical benthic foraminiferal species, is thriving at temperate latitudes in the Mediterranean Sea 为什么热带底栖有孔虫物种 Amphistegina lobifera 能在地中海温带地区繁衍生息？

IF 0.9 4区地球科学

Journal of Foraminiferal Research Pub Date : 2024-07-01 DOI: 10.61551/gsjfr.54.3.237

Pamela Hallock, O. Koukousioura, Ahmed Mohamed BadrElDin

{"title":"Why Amphistegina lobifera, a tropical benthic foraminiferal species, is thriving at temperate latitudes in the Mediterranean Sea","authors":"Pamela Hallock, O. Koukousioura, Ahmed Mohamed BadrElDin","doi":"10.61551/gsjfr.54.3.237","DOIUrl":"https://doi.org/10.61551/gsjfr.54.3.237","url":null,"abstract":"\u0000 Amphistegina lobifera Larsen is a relatively large (adult diameter ∼1–3 mm), robust, diatom-symbiont-bearing benthic foraminiferal species that thrives in clear, nutrient-poor coastal waters throughout much of the subtropical/tropical Indo-Pacific. Studies in the late 19th to mid-20th century noted the predominance of the shells of Amphistegina and Calcarina in Holocene reef sediments, enhanced by hydrodynamic sorting and by the resistance of these shells to abrasion. Having migrated through the Suez Canal at least 60–80 years before present, A. lobifera populations have proliferated in the eastern Mediterranean Sea and have expanded their range westward. As Mediterranean waters warm, these foraminifers are thriving in oligotrophic, shallow-water habitats, and have produced shell accumulations of a half meter or more in some areas. While the success of A. lobifera has raised concerns about its proliferation as an invasive species, assessments of foraminiferal assemblages along nutrient gradients have shown dominance only distant from nutrient sources, whether natural or anthropogenic. The genus Amphistegina emerged in the Eocene under higher atmospheric CO2 concentrations than present and experimental studies have shown that these foraminifers can sustain shell-growth rates under elevated pCO2. Warming temperatures also increase metabolic rates, increasing the energetic advantages of algal symbiosis. As surface waters continue to warm, the already elevated salinity and alkalinity in the eastern and central Mediterranean should further enhance carbonate production by A. lobifera and possibly by other benthic foraminifers that host algal symbionts. Observed rates of accumulation by hydrodynamic concentration of dead shells by nearshore wave action are comparable to rates of ongoing sea-level rise. Might this return of prolific shallow-water carbonate production ultimately prove at least locally beneficial as climate change progresses?","PeriodicalId":54832,"journal":{"name":"Journal of Foraminiferal Research","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141850031","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Foraminifera in the glacial erratic rock Sternberger Gestein from northern Germany 德国北部 Sternberger Gestein 冰川糜棱岩中的有孔虫

IF 0.9 4区地球科学

Journal of Foraminiferal Research Pub Date : 2024-07-01 DOI: 10.61551/gsjfr.54.3.249

M. Hesemann, Dieter Ketelsen

{"title":"Foraminifera in the glacial erratic rock Sternberger Gestein from northern Germany","authors":"M. Hesemann, Dieter Ketelsen","doi":"10.61551/gsjfr.54.3.249","DOIUrl":"https://doi.org/10.61551/gsjfr.54.3.249","url":null,"abstract":"\u0000 This study is part of a project that aims to provide the first comprehensive analysis of foraminifera in glacial erratics. Such studies may be used to clarify the origin of glacial erratics and serve as indicators of the direction of glacial movements. The glacial erratics, which were deposited during the Pleistocene Ice Ages, cover vast areas in northern Germany and beyond. The origin of erratics with fossil content can be clarified by correlating them with undisturbed strata. The foraminiferal assemblages of 21 pieces of the glacial erratic Sternberger Gestein (SG) are documented and illustrated. A total of 82 foraminiferal taxa were found, of which 69 taxa were illustrated, representing 97% of the counted specimens. Cluster analysis and analysis of similarities were used to determine the affinities between pieces. Based on previous borehole studies, the fauna in the SG pieces can be correlated regionally with the Palmula oblonga horizon and globally with the Chattian (Oligocene). Indicative are the frequent presence of taxa such as Elphidium subnodosum, Nodosaria intermittens, and Palmula oblonga. Additionally, the absence of marker species commonly found in horizons above and below supports this assignment. The SG assemblages represent an inner sublittoral biofacies that indicates a water depth of less than 50 m.","PeriodicalId":54832,"journal":{"name":"Journal of Foraminiferal Research","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141841494","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The Oligo-Miocene Qom Formation (Iran): Re-examination of biostratigraphy and age interpretations in the Sanandaj–Sirjan and Central Iran basins (NE margin of the Tethyan Seaway) 中新世古姆地层（伊朗）：重新审查萨南达季-锡尔詹和伊朗中部盆地（泰提安海道东北缘）的生物地层学和年代解释

IF 0.9 4区地球科学

Journal of Foraminiferal Research Pub Date : 2024-07-01 DOI: 10.61551/gsjfr.54.3.202

Ebrahim Mohammadi

{"title":"The Oligo-Miocene Qom Formation (Iran): Re-examination of biostratigraphy and age interpretations in the Sanandaj–Sirjan and Central Iran basins (NE margin of the Tethyan Seaway)","authors":"Ebrahim Mohammadi","doi":"10.61551/gsjfr.54.3.202","DOIUrl":"https://doi.org/10.61551/gsjfr.54.3.202","url":null,"abstract":"\u0000 The depositional history of the Qom Formation, along the northeastern margin of the Tethyan Seaway, is recognized as essential to understanding the connection between the Eastern Tethys (the proto-Indian Ocean) and the Western Tethys regions (the proto-Mediterranean Sea). This paper re-examines the Qom Formation’s biostratigraphy and age interpretations of four stratigraphic sections (Abadeh, Zefreh, Chalheghareh, and Qom) and proposes revisions. These sections were previously studied within a project dealing with the palaeogeographic and palaeobiogeographic reconstruction of the Tethyan Seaway during the Late Oligocene to Early Miocene. Those biostratigraphic interpretations subdivided the time interval for deposition of the Qom Formation into Rupelian, Chattian, Aquitanian, and Burdigalian. However, some age-based interpretations were inconsistent with the confirmed age ranges of seven planktic foraminiferal species, as well as with the last occurrence of true-Nummulites spp. and the first appearance of Borelis melo curdica. These revised interpretations show that: a) the basal 38 m of the Abadeh section must be attributed to Rupelian; b) in the Qom section, 500 m of deposits previously interpreted as Burdigalian, must be attributed to the Aquitanian; and c) in the Zefreh section, the lower 30 m likely were deposited in the Chattian, and all deposits (107 m) previously interpreted as Burdigalian can be attributed to the Aquitanian.","PeriodicalId":54832,"journal":{"name":"Journal of Foraminiferal Research","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141850978","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

2024 Cushman Foundation for Foraminiferal Research Award and Grant Recipients 2024 库什曼有孔虫研究基金会奖和赠款获得者

IF 0.9 4区地球科学

Journal of Foraminiferal Research Pub Date : 2024-07-01 DOI: 10.61551/gsjfr.54.3.201

引用次数: 0

Holocene Foraminifera, Climate, and Decelerating Rise in Sea Level on the Mud Patch, Southern New England Continental Shelf 全新世有孔虫、气候和新英格兰南部大陆架泥斑块海平面的减速上升

IF 1.1 4区地球科学

Journal of Foraminiferal Research Pub Date : 2024-04-01 DOI: 10.61551/gsjfr.54.2.172

Kenneth G. Miller, J. Browning, Lloyd D. Keigwin, J. Chaytor, Emily R. Schneider, Matthew Richtmyer, W. Schmelz

引用次数: 0

Paleoenvironmental and Paleoecological Dynamics of the U.S. Atlantic Coastal Plain Prior to and During the Paleocene-Eocene Thermal Maximum 古新世-始新世热极盛期之前和期间美国大西洋沿岸平原的古环境和古生态动态

IF 1.1 4区地球科学

Journal of Foraminiferal Research Pub Date : 2024-04-01 DOI: 10.61551/gsjfr.54.2.143

Monika Doubrawa, P. Stassen, Marci M. Robinson, R. Speijer

{"title":"Paleoenvironmental and Paleoecological Dynamics of the U.S. Atlantic Coastal Plain Prior to and During the Paleocene-Eocene Thermal Maximum","authors":"Monika Doubrawa, P. Stassen, Marci M. Robinson, R. Speijer","doi":"10.61551/gsjfr.54.2.143","DOIUrl":"https://doi.org/10.61551/gsjfr.54.2.143","url":null,"abstract":"\u0000 We studied the rapid paleo-environmental changes and the corresponding biotic responses of benthic foraminifera of a shallow shelf site during the late Paleocene and the Paleocene-Eocene Thermal Maximum (PETM). The PETM is globally characterized by a negative δ13C excursion in marine and terrestrial sediments. Isotope data from the Atlantic Coastal Plain from the South Dover Bridge core, Maryland, show an additional small δ13C excursion just below the base of the PETM: the “pre-onset excursion” (POE). The benthic foraminiferal and coupled grain-size record of the late Paleocene indicates a well-oxygenated, current-dominated environment with a stable, high food supply. During the POE, bottom currents become subdued and finer-grained sediment accumulation increased. These changes are partially reversed after the end of the POE. Before the PETM the river influence increases again, food supply becomes more pulsed and the benthic taxa, typically connected to the PETM, start to appear in those gradually warming conditions. During the PETM, the environment shifts to a river-dominated one, with strongly reduced currents. The low-diversity PETM fauna thrives under episodic low-oxygen conditions, caused by river-induced stratification, while the Paleocene assemblage nearly vanishes from the record. Gradually the environment begins to recover, the grain size shows an uptick in bottom currents and pre-PETM foraminifera become more abundant again, indicating increased oxygen levels and a more stable food supply. While the overall environmental shifts at South Dover Bridge fit within the observations across the shelf, the POE related insights are so far unique. Our bathymetric reconstructions show an outer neritic paleodepth (∼100 m) during the Paleocene, with a modest sea level rise in the core phase of the PETM, which is subsequently reversed during the recovery phase.","PeriodicalId":54832,"journal":{"name":"Journal of Foraminiferal Research","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140775614","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0