Marine Micropaleontology最新文献

Large-sized benthic foraminifera at the northern limit of subtropical zone: southern Kochi, Shikoku Island, Japan 亚热带北部边界的大型底栖有孔虫：日本四国岛高知南部

IF 1.5 4区地球科学

Marine Micropaleontology Pub Date : 2025-07-02 DOI: 10.1016/j.marmicro.2025.102489

Bryan Gabriel P. Tan , Kazuhiko Fujita

{"title":"Large-sized benthic foraminifera at the northern limit of subtropical zone: southern Kochi, Shikoku Island, Japan","authors":"Bryan Gabriel P. Tan , Kazuhiko Fujita","doi":"10.1016/j.marmicro.2025.102489","DOIUrl":"10.1016/j.marmicro.2025.102489","url":null,"abstract":"<div><div>Large benthic foraminifera (LBF) are relatively large (>0.5 mm), symbiotic with microalgae, and can be found in tropical to subtropical, clear, shallow waters. LBF are commonly studied in lower latitudes but are less studied in higher latitudes close to their current limit of geographic distribution. As climate change progresses, poleward extension is expected to proceed apace, thus it is important to characterize benthic foraminiferal fauna in these higher latitude zones in order to track the progress of their habitat extensions. The present study examined large-sized (0.5 to 2 mm size fraction) benthic foraminifera, both symbiotic and non-symbiotic, in one such region: Kochi Prefecture in Shikoku Island, Japan. Living foraminifera attached to algae as well as in sediment, and dead foraminiferal tests in sediment were collected from three stations in the study area. A total of 64 taxa were identified, of which 17 were found living in algae, 8 living in sediment, and 60 were dead in sediment. <em>Amphistegina lobifera</em> was the dominant species in the region, making up almost 50 % of all specimens identified, followed by other symbiotic foraminifera. Compared to foraminiferal living communities and dead assemblages in lower latitudes (the Ryukyu Island Arc), amphisteginids and textulariids were more common in Kochi. Calcarinids which are dominant in the Ryukyu Island Arc were not found in this study.</div></div>","PeriodicalId":49881,"journal":{"name":"Marine Micropaleontology","volume":"199 ","pages":"Article 102489"},"PeriodicalIF":1.5,"publicationDate":"2025-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144572785","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

Paleoceanography and marine ecosystem over 250 ky offshore Southwest Western Australia; Insight from nannofossil assemblages 西澳大利亚西南部250公里海域的古海洋学和海洋生态系统；来自纳米化石组合的见解

IF 1.5 4区地球科学

Marine Micropaleontology Pub Date : 2025-06-28 DOI: 10.1016/j.marmicro.2025.102488

Maqsood Ur Rahman , Tao Jiang , Muhammad Sarim , Qianru Wang , Muhammad Hanif , Cong Cheng

{"title":"Paleoceanography and marine ecosystem over 250 ky offshore Southwest Western Australia; Insight from nannofossil assemblages","authors":"Maqsood Ur Rahman , Tao Jiang , Muhammad Sarim , Qianru Wang , Muhammad Hanif , Cong Cheng","doi":"10.1016/j.marmicro.2025.102488","DOIUrl":"10.1016/j.marmicro.2025.102488","url":null,"abstract":"<div><div>Nannofossil fluctuations during glacial-interglacial cycles reveal paleo-ecosystem responses to climatic and oceanic changes. This study examines nannofossil assemblages from IODP Hole U1516B in the Mentelle Basin (offshore southwest Western Australia (SWWA)), a region influenced by the Western Australian Current (WAC), Leeuwin Undercurrent (LUC), Leeuwin Current (LC), and its eddies. Using nannofossil counts, diversity indices, and organic geochemistry over 250 ky, this study assesses how circulation shifts impacted communities and productivity. Results reveal LC dominance through its eddies, extending >200 km westward offshore at Cape Leeuwin, unlike the 100 km width in offshore Western Australia. During glacials, LC weakened, assessed by small placoliths blooms, although persistence of <em>Florisphaera profunda</em> indicates weak LC influence. Total organic carbon (TOC) and nitrogen (TN) exhibit a moderate correlation, with slightly higher glacials TOC values reflecting enhanced productivity. Carbon‑nitrogen ratios (C/<em>N</em> > 12) suggest mixed marine-terrestrial organic matter. Nannofossil abundance declines during glacials, likely due to aeolian or high terrigenous input, while diversity rises, indicating evenly distributed communities. Interglacials show high abundance but low diversity, dominated by <em>F. profunda</em>. These trends link LC strength to ecosystem structure, where during interglacial LC suppresses upwelling, favoring oligotrophic taxa like <em>F. profunda</em>, whereas during glacials, LC weakening permits WAC and LUC-driven mixing, boosting productivity and diversity. These findings emphasize how oceanic circulation and productivity shifts, driven by glacial-interglacial cycles, structured historical ecosystems. Similar dynamics may influence future ecological responses to climate change, particularly as warming alters current systems.</div></div>","PeriodicalId":49881,"journal":{"name":"Marine Micropaleontology","volume":"199 ","pages":"Article 102488"},"PeriodicalIF":1.5,"publicationDate":"2025-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144518977","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

Response of calcareous nannofossils during the danian-thanetian isotopic events in the Elles Section, Central Tunisia 突尼斯中部埃莱斯剖面钙质纳米化石在达旦-达旦-达旦同位素事件中的响应

IF 1.5 4区地球科学

Marine Micropaleontology Pub Date : 2025-06-28 DOI: 10.1016/j.marmicro.2025.102487

Mahmoud Faris , Sherif Farouk , Fayez Ahmad , Zaineb Elamri , Adel El Shahawy , Fatma Shaker

{"title":"Response of calcareous nannofossils during the danian-thanetian isotopic events in the Elles Section, Central Tunisia","authors":"Mahmoud Faris , Sherif Farouk , Fayez Ahmad , Zaineb Elamri , Adel El Shahawy , Fatma Shaker","doi":"10.1016/j.marmicro.2025.102487","DOIUrl":"10.1016/j.marmicro.2025.102487","url":null,"abstract":"<div><div>A high resolution quantitative study of calcareous nannofossils from the Elles section in Central Tunisia (North Africa) was conducted to assess local phytoplankton paleocommunities and infer paleoclimatic conditions. This research introduces a refined subdivision of the conventional NP4 nannofossil zone into six finer intervals (NTp6, NTp7A-B, NTp8A-C), a first for Tunisia, enhancing the biostratigraphic resolution of Paleocene stratigraphy in the region. The assemblages within these subzones exhibit moderate to good preservation and correlate globally with established Tethyan biozonations. Three key isotopic events were identified: The Dan-C2 event, characterized by a negative δ<sup>13</sup>C shift at the base of the NP2 Zone, associated with a significant increase in oligotrophic and warm-water taxa; the Latest Danian Event (LDE), which is divided into Pre- and Post-LDE intervals. The Pre-LDE interval is marked by a short-lived negative δ<sup>13</sup>C excursion within the lowermost part of NTp7A Subzone boundary, accompanied by a notable decline in the diversity and richness of calcareous nannofossils. The third event, the Selandian-Thanetian Transition Event (STTE), occurs at the base of NP7/8 and is biostratigraphically defined by the Lowest Occurrence (LO) of <em>Discoaster mohleri</em>, with a replacement of R-mode taxa by species adapted to warmer, more oligotrophic conditions. The Danian-Selandian transition is clearly delineated by a glauconite-rich hard marl layer (upper NTp8C). This integrated stratigraphic study provides high-resolution biostratigraphy and critical insights into paleoenvironmental changes during this period. The paleoenvironment shifted from warm, oligotrophic conditions during the events to cooler, eutrophic waters both before and after. These findings suggest that the three bioevents may correspond to an early Paleocene hyperthermal episode.</div></div>","PeriodicalId":49881,"journal":{"name":"Marine Micropaleontology","volume":"199 ","pages":"Article 102487"},"PeriodicalIF":1.5,"publicationDate":"2025-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144510989","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

New dinoflagellate cyst species of the Areoligeraceae, Ceratiaceae, Gonyaulacaceae, and Peridiniaceae from the Santonian–Campanian (Upper Cretaceous) of the Nanaimo Group, British Columbia, Canada 加拿大不列颠哥伦比亚省Nanaimo群圣东统-坎帕尼亚统（上白垩统）中Areoligeraceae、Ceratiaceae、Gonyaulacaceae和Peridiniaceae的鞭毛藻囊新种

IF 1.5 4区地球科学

Marine Micropaleontology Pub Date : 2025-06-13 DOI: 10.1016/j.marmicro.2025.102485

Sandy M.S. McLachlan , Vera Pospelova , James W. Haggart , Kenneth N. Mertens

{"title":"New dinoflagellate cyst species of the Areoligeraceae, Ceratiaceae, Gonyaulacaceae, and Peridiniaceae from the Santonian–Campanian (Upper Cretaceous) of the Nanaimo Group, British Columbia, Canada","authors":"Sandy M.S. McLachlan , Vera Pospelova , James W. Haggart , Kenneth N. Mertens","doi":"10.1016/j.marmicro.2025.102485","DOIUrl":"10.1016/j.marmicro.2025.102485","url":null,"abstract":"<div><div>This is the first study of the late Santonian–early late Campanian dinoflagellate cyst assemblages from the Nanaimo Group strata along eastern Vancouver Island and Denman Island, British Columbia. Four new dinoflagellate cyst species are reported from twenty samples recovered from six localities from the Haslam, Trent River, and Cedar District formations: <em>Alterbidinium</em>? <em>fusiforme</em> sp. nov., <em>Canningia grahamii</em> sp. nov., <em>Nematosphaeropsis snunymuxwensis</em> sp. nov. and <em>Odontochitina kwutlkwuensis</em> sp. nov. Emended diagnoses are proposed for the genera <em>Alterbidinium</em> and <em>Odontochitina</em>, and each of the new species are presented in high resolution scanning electron microscopy images which extend the parameters of morphologies previously recognized as occurring within the families Areoligeraceae, Ceratiaceae, Gonyaulacaceae, and Peridiniaceae. These taxa carry biostratigraphic utility within a temporally constrained interval for the Late Cretaceous toward correlation with other regions in the Northern Hemisphere as well as applications for paleoenvironmental interpretations drawing from their relative and absolute abundances.</div></div>","PeriodicalId":49881,"journal":{"name":"Marine Micropaleontology","volume":"199 ","pages":"Article 102485"},"PeriodicalIF":1.5,"publicationDate":"2025-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144572784","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

Enhanced sedimentary ancient DNA (sedaDNA) retrieval from Antarctic diatoms 从南极硅藻中增强沉积古DNA （sedaDNA）检索

IF 1.5 4区地球科学

Marine Micropaleontology Pub Date : 2025-06-07 DOI: 10.1016/j.marmicro.2025.102477

Prashasti Singh , João C. Teixeira , Michael E. Weber , Christopher Bolch , Linda Armbrecht

{"title":"Enhanced sedimentary ancient DNA (sedaDNA) retrieval from Antarctic diatoms","authors":"Prashasti Singh , João C. Teixeira , Michael E. Weber , Christopher Bolch , Linda Armbrecht","doi":"10.1016/j.marmicro.2025.102477","DOIUrl":"10.1016/j.marmicro.2025.102477","url":null,"abstract":"<div><div>Diatom microfossils are key environmental indicators and an important proxy in paleoenvironmental reconstructions. Sedimentary ancient DNA (<em>sed</em>aDNA) complements microfossil analysis by detecting poorly preserved diatoms and distinguishing morphologically similar taxa, painting a more detailed picture of the past. However, retrieving diatom <em>sed</em>aDNA in marine environments can be challenging due to trace amounts being preserved in the sediment record. Optimising existing protocols is thus essential to maximise diatom <em>sed</em>aDNA yield. This study compares six methods to determine the best approach for recovering diatom <em>sed</em>aDNA from Antarctic marine sediment cores. The same six samples from two sites - U1536C (West Antarctica) and KC02 (East Antarctica), were extracted. Post shotgun sequencing, the methods were evaluated based on diatom <em>sed</em>aDNA recovery, fragment length, and species diversity. Results showed that method performance in retrieving the highest number of Bacillariophyta (diatom) reads is primarily driven by site (R<sup>2</sup> = 0.593, <em>p</em> = 0.001) and sample age (R<sup>2</sup> = 0.401, p = 0.001), while the extraction method had minimal influence (R<sup>2</sup> = 0.001, <em>p</em> = 0.064). The SiMAG method proved highly effective in U1536C but was entirely ineffective in KC02, where the COM Short method successfully recovered diatom <em>sed</em>aDNA. Other methods, including COM QG, PPKIT, and PB, consistently resulted in low <em>sed</em>aDNA yields. Differences in the diversity and the relative abundance of taxonomic classes were also seen across methods (χ2 88.04 to 99,664.17). This study serves as a focal point for experiments aiming to maximise diatom <em>sed</em>aDNA recovery enabling accurate reconstructions of Antarctic marine ecosystems.</div></div>","PeriodicalId":49881,"journal":{"name":"Marine Micropaleontology","volume":"199 ","pages":"Article 102477"},"PeriodicalIF":1.5,"publicationDate":"2025-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144523045","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

Foraminiferal image classification based on convolutional neural network considering data augmentation optimization 考虑数据增强优化的卷积神经网络有孔虫图像分类

IF 1.5 4区地球科学

Marine Micropaleontology Pub Date : 2025-06-06 DOI: 10.1016/j.marmicro.2025.102476

Jincan Wang , Muhui Zhang , Weiping Zeng , Songzhu Gu , Qingzhong Liang , Shuqin Zhou , Zimeng Gao

{"title":"Foraminiferal image classification based on convolutional neural network considering data augmentation optimization","authors":"Jincan Wang , Muhui Zhang , Weiping Zeng , Songzhu Gu , Qingzhong Liang , Shuqin Zhou , Zimeng Gao","doi":"10.1016/j.marmicro.2025.102476","DOIUrl":"10.1016/j.marmicro.2025.102476","url":null,"abstract":"<div><div>Foraminifera are of utmost importance in paleoclimate and marine ecosystem research, with accurate classification being equally vital. Convolutional Neural Networks (CNNs) can realize the automatic classification of foraminiferal images, but they usually rely on data augmentation to address the issue of data scarcity. Despite the widespread use of data augmentation methods, the impacts of various augmentation methods on the classification of foraminifera remain unclear. In this study, we systematically evaluated the effects of different data augmentation methods on the classification performance of CNNs using three publicly available datasets. Experiments based on the ResNet-50 architecture showed that random rotation (RR), random flipping (RF), and random erasing (RE, ratio = 0.2) significantly improved the classification accuracy. The combined model of these three methods achieved accuracies of 89.4 %, 89.7 %, and 95.7 %, and F1 scores of 72.7 %, 72.8 %, and 84.3 % in the three tasks respectively. Compared with the basic model, the accuracy (A) increased by an average of 3.2 %, and the F1 score (F1) increased by an average of 7.1 %. This study confirms that selecting and combining appropriate data augmentation methods can effectively enhance the performance of foraminiferal image classification, with the combination of RR, RF, and RE being the most effective.</div></div>","PeriodicalId":49881,"journal":{"name":"Marine Micropaleontology","volume":"199 ","pages":"Article 102476"},"PeriodicalIF":1.5,"publicationDate":"2025-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144222400","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

Environmental history of northwestern Vancouver Island (British Columbia, Canada) during the Holocene: A high-resolution dinoflagellate cyst record from Kyuquot Sound 加拿大不列颠哥伦比亚省温哥华岛西北部全新世环境史：奎括湾高分辨率鞭毛藻囊记录

IF 1.5 4区地球科学

Marine Micropaleontology Pub Date : 2025-06-02 DOI: 10.1016/j.marmicro.2025.102475

Pieter R. Gurdebeke , Vera Pospelova , Kenneth N. Mertens , Zhen Li , Bjarn Van Riet , Audrey Dallimore , Stephen Louwye

{"title":"Environmental history of northwestern Vancouver Island (British Columbia, Canada) during the Holocene: A high-resolution dinoflagellate cyst record from Kyuquot Sound","authors":"Pieter R. Gurdebeke , Vera Pospelova , Kenneth N. Mertens , Zhen Li , Bjarn Van Riet , Audrey Dallimore , Stephen Louwye","doi":"10.1016/j.marmicro.2025.102475","DOIUrl":"10.1016/j.marmicro.2025.102475","url":null,"abstract":"<div><div>Environmental changes over the Holocene were reconstructed based on the analysis of dinoflagellate cyst assemblages, their absolute abundances, and morphological changes in <em>Operculodinium centrocarpum</em> sensu Wall & Dale 1966 from 103 sediment samples collected from Core 2012002PGC133 in Tahsish Inlet (Kyuquot Sound), a fjord on the west coast of Vancouver Island (British Columbia, Canada). Eight accelerator mass spectrometry <sup>14</sup>C dates indicate that the record spans the last 12 ka. The cysts are well-preserved, with assemblages displaying high diversity (37 taxa). Six dinoflagellate cyst assemblage zones were identified. Zone I is dominated by <em>Operculodinium centrocarpum</em> sensu Wall & Dale 1966, while subsequent zones (II–IV) are characterized mainly by cysts of heterotrophic species. The uppermost zones (V–VI) show increased abundances of autotrophic taxa. The dinoflagellate cyst record reflects regional and global environmental signals. The dominance of <em>Operculodinium centrocarpum</em> sensu Wall & Dale 1966 during the Younger Dryas corresponds to a lower relative sea level, indicative of marsh-like conditions or proximity to the inlet head at the core site. Increased heterotrophic taxa during the late Early and Middle Holocene suggests a rising marine influence due to RSL rise, possibly enhancing primary productivity through coastal upwelling. Reduced process lengths in <em>Operculodinium centrocarpum</em> sensu Wall & Dale 1966 around ∼8.7 cal kyr BP indicate an abrupt change in local environmental conditions. A sharp increase in absolute cyst abundances ∼2.2 cal kyr BP, primarily driven by <em>Spiniferites</em> spp., is proposed to be linked with climate- and tsunami-related mechanisms.</div></div>","PeriodicalId":49881,"journal":{"name":"Marine Micropaleontology","volume":"199 ","pages":"Article 102475"},"PeriodicalIF":1.5,"publicationDate":"2025-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144289144","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

Sedimentary record of Polysphaeridium zoharyi (cyst of Pyrodinium bahamense) in El Colorado Lagoon, Gulf of California 加利福尼亚湾El Colorado泻湖Polysphaeridium zoharyi （Pyrodinium bahamense囊肿）的沉积记录

IF 1.5 4区地球科学

Marine Micropaleontology Pub Date : 2025-05-21 DOI: 10.1016/j.marmicro.2025.102472

Tomasa Cuellar-Martinez, Rosalba Alonso-Rodríguez, Ana Carolina Ruiz-Fernández, Joan-Albert Sanchez-Cabeza

{"title":"Sedimentary record of Polysphaeridium zoharyi (cyst of Pyrodinium bahamense) in El Colorado Lagoon, Gulf of California","authors":"Tomasa Cuellar-Martinez, Rosalba Alonso-Rodríguez, Ana Carolina Ruiz-Fernández, Joan-Albert Sanchez-Cabeza","doi":"10.1016/j.marmicro.2025.102472","DOIUrl":"10.1016/j.marmicro.2025.102472","url":null,"abstract":"<div><div>The temporal variations in abundances (cyst g<sup>−1</sup> and percentages) and fluxes (cyst cm<sup>−2</sup> yr<sup>−1</sup>) of dinoflagellate cysts, including <em>Polysphaeridium zoharyi</em> from the toxic species <em>Pyrodinium bahamense</em>, were analyzed in a <sup>210</sup>Pb-dated sediment core from El Colorado Lagoon (Mexico) to investigate potential natural and/or human-driven factors, influencing the proliferation of <em>P. bahamense</em>, by examining the relationship between <em>P. zoharyi</em> abundance and geochemical indicators of sediment provenance and hydrodynamic conditions. <em>P. zoharyi</em> was the most abundant and frequently observed species along the core. The dominance of <em>P. zoharyi</em> was linked to the prevalence of terrigenous influence in most core sections, implying enhanced nutrient delivery. In recent years (∼1970s), the decrease in <em>P. zoharyi</em> percentages was associated with a local shift in hydrodynamic conditions, as revealed by an increase in sand content, changes in the δ<sup>13</sup>C and δ<sup>15</sup>N composition, and higher concentrations of marine indicator elements (Br, Ca, Na, and Sr). The change in hydrodynamic conditions suggests enhanced connectivity with the sea, likely triggered by a meteorological event. We highlight the importance of integrating multiple geochemical proxies with cyst analysis to assess changes in species assemblages and how local conditions, such as shifts in hydrodynamic conditions, that can influence species composition. This study contributes to paleoecology and phytoplankton ecology by documenting species responses to natural and anthropogenic disturbances. It confirms the recurrence and dominance of <em>P. bahamense</em> cysts, a toxin-producing species associated with harmful algal blooms. The findings underscore the need for continued monitoring, contingency planning, and water quality protection in coastal ecosystems.</div></div>","PeriodicalId":49881,"journal":{"name":"Marine Micropaleontology","volume":"199 ","pages":"Article 102472"},"PeriodicalIF":1.5,"publicationDate":"2025-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144169576","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 genetic isolation of planktonic foraminifera in the North Pacific gyre and adjacent marginal seas 北太平洋环流及其邻近边缘海浮游有孔虫的遗传分离

IF 1.5 4区地球科学

Marine Micropaleontology Pub Date : 2025-05-21 DOI: 10.1016/j.marmicro.2025.102473

Kate F. Darling , Agnes K.M. Weiner , Atsushi Kurasawa , Takashi Toyofuku , Hiroshi Nishi , Hiroshi Kitazato

{"title":"The genetic isolation of planktonic foraminifera in the North Pacific gyre and adjacent marginal seas","authors":"Kate F. Darling , Agnes K.M. Weiner , Atsushi Kurasawa , Takashi Toyofuku , Hiroshi Nishi , Hiroshi Kitazato","doi":"10.1016/j.marmicro.2025.102473","DOIUrl":"10.1016/j.marmicro.2025.102473","url":null,"abstract":"<div><div>Gaining insight into the speciation processes prevailing in the modern open ocean requires a comprehensive understanding of the spatial dynamics of the planktonic species that inhabit it, calibrated against time. The high-resolution fossil record of the planktonic foraminifera not only provides such insight but also plays a crucial role in the study of past climate. Both rely on understanding how species relate to the current physical and ecological character of the oceanic water masses they inhabit. Within global single cell barcoding and metabarcoding studies of planktonic foraminifera, the North Pacific subtropical and subpolar gyres remain under-sampled, with the capacity to harbour unrecognised ecologically distinct cryptic species. Targeting this issue, <em>Globigerina bulloides</em> specimens were collected during 12 cruises and near shore sampling campaigns throughout the Northern Pacific and marginal seas. Using standard molecular approaches, 406 specimens were genetically characterised and combined with 42 publicly available sequences to provide a fully comprehensive overview of <em>G. bulloides</em> diversity throughout the North Pacific. Of ten globally recognised genotypes, six (Ia, Ic, Id, IIa, IId, IIf) inhabit the water masses south of the Subpolar Front, with only a single genotype (IIe) inhabiting the vast Subpolar gyre and marginal seas. Genetic isolation was found to prevail throughout both the western subtropical waters (Types Ic and Id) and subpolar waters (Type IIe) of the North Pacific together with the North and South Pacific eastern boundary currents (Type IId). Unlike the Atlantic, bipolarity does not occur between the North Pacific and the Southern Ocean subpolar/polar pelagic biomes.</div></div>","PeriodicalId":49881,"journal":{"name":"Marine Micropaleontology","volume":"199 ","pages":"Article 102473"},"PeriodicalIF":1.5,"publicationDate":"2025-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144222401","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

Extant benthic foraminifera from the Indonesian seas: An update of what we know so far and implications for future studies 印度尼西亚海域现存底栖有孔虫：迄今为止我们所知道的最新情况及其对未来研究的影响

IF 1.5 4区地球科学

Marine Micropaleontology Pub Date : 2025-05-01 DOI: 10.1016/j.marmicro.2025.102471

Sinatrya D. Prayudi , Suhartati M. Natsir , Michael A. Kaminski

{"title":"Extant benthic foraminifera from the Indonesian seas: An update of what we know so far and implications for future studies","authors":"Sinatrya D. Prayudi , Suhartati M. Natsir , Michael A. Kaminski","doi":"10.1016/j.marmicro.2025.102471","DOIUrl":"10.1016/j.marmicro.2025.102471","url":null,"abstract":"<div><div>To offer a comprehensive understanding of the diversity of benthic foraminifera in the Indonesian seas, we analyzed more than 70 years of datasets from both local and international sources. By reviewing articles covering three major biogeographical regions—Sunda Shelf, Sahul Shelf, and Wallacea—and their varying environmental conditions and depositional environments, we identified a total of 1164 species (including uncertain and genus-level identifications) belonging to 448 genera, 136 families, 14 orders, and four classes, in addition to 1116 genus-level naming (sp. and spp.). Our analysis also revealed 762 instances of taxonomic misnaming, with errors stemming from the use of unaccepted names and confusion between fossils, planktonic, and benthic assemblages. Additionally, most of the reviewed studies were found to be incomplete due to insufficient oceanographic data and a lack of detailed species counts, despite the importance of these factors in such research. This work establishes a robust baseline for future studies and highlights key issues that need to be addressed to avoid repeating past uncertainties and to promote more focused research on benthic foraminifera in the region.</div></div>","PeriodicalId":49881,"journal":{"name":"Marine Micropaleontology","volume":"197 ","pages":"Article 102471"},"PeriodicalIF":1.5,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144098555","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}

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