Journal of Nannoplankton Research最新文献

{"title":"Calcareous nannoplankton as a tracer of the marine influence on the NW coast of Portugal over the last 14 000 years.","authors":"C. Guerreiro, M. Cachão, T. Drago","doi":"10.58998/jnr2107","DOIUrl":"https://doi.org/10.58998/jnr2107","url":null,"abstract":"A calcareous nannoplankton taphonomic and palaeoecological study was performed on cores from the Minho and Douro Estuaries (NW Portugal) and from the NW Portuguese middle continental shelf. Because certain nannoplankton species are taphonomically resistant to the highly energetic and aggressive conditions between the estuaries and the shelf, their sedimentary record acts as an oceanic tracer in such coastal domains. For the Late Quaternary, this allows interpretation of eustatic variation from the induced sequence of palaeoenvironmental changes. Palaeogeographically, the time-series pattern of nannofossil abundances in these coastal sediments is interpreted as follows: (1) persistently high amounts of nannofossils (2x107 nannofossils/g) are related to marine environmental conditions, produced by post-glacial flooding of pre-existing valleys; (2) the gradual increase in intermittency of nannofossil abundances through time indicates a regressive trend, first due to recovery of the estuarine conditions, followed by a total absence of nannofossils, indicating evolution towards complete emersion either by fluvial (Core CPF1) or barrier-beach sediments (Cores M1, M2, D1A and D1B). During the Late Holocene, the nannoplankton assemblages were similar to those found in Present Day neritic conditions. The main taxa comprise Gephyrocapsa spp., Helicosphaera carteri, Emiliania huxleyi and Coccolithus pelagicus sensu lato. An unexpected and extremely high percentage of H. carteri in the Douro Estuary’s mouth was likely related to local confinement, which probably provided adequate and particular nutrient concentrations that prompted opportunistic behaviour in","PeriodicalId":186533,"journal":{"name":"Journal of Nannoplankton Research","volume":"74 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129740760","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Validation of new combinations.","authors":"K. Perch-Nielsen","doi":"10.58998/nina2192","DOIUrl":"https://doi.org/10.58998/nina2192","url":null,"abstract":"","PeriodicalId":186533,"journal":{"name":"Journal of Nannoplankton Research","volume":"275 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116219225","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Discoaster drieveri, nomen novum pro Discoaster bramlettei (Bukry & Percival 1971) Romein 1979 non Martini 1958.","authors":"A. Romein","doi":"10.58998/nina2210","DOIUrl":"https://doi.org/10.58998/nina2210","url":null,"abstract":"","PeriodicalId":186533,"journal":{"name":"Journal of Nannoplankton Research","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127142487","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Prae-Jurassic and Jurassic calcareous nannofossil bibliography: An update.","authors":"E. Erba","doi":"10.58998/nina2083","DOIUrl":"https://doi.org/10.58998/nina2083","url":null,"abstract":"","PeriodicalId":186533,"journal":{"name":"Journal of Nannoplankton Research","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125446610","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A note on calcareous nannoplankton from the Kieler Förde (Baltic Sea).","authors":"K. Meier, H. Kinkel, J. Young","doi":"10.58998/jnr2178","DOIUrl":"https://doi.org/10.58998/jnr2178","url":null,"abstract":"One of the first records of coccolithophore distribution in plankton samples comes from the Kieler Förde and dates back to the work of Hans Lohmann from the early 20th century. Lohmann reported Emiliania huxleyi as the only coccolithophore species from the Kieler Förde. We studied the modern coccolithophore community in surface water samples taken in the years 2009 to 2013 directly from one of the piers in the inner part of the Kieler Förde and from a short cruise into the outer Kieler Förde. Apart from the dominant species E. huxleyi, we document Algirosphaera robusta, Acanthoica quattrospina (both heteroand holococcolith phase), Syracosphaera borealis, Alisphaera extenta, and Hymenomonas sp. Additionally, we describe Pileolosphaera longistirpes gen et sp. nov., a new calcareous nannoplankton species of unknown taxonomic affinity with a neritic distribution.","PeriodicalId":186533,"journal":{"name":"Journal of Nannoplankton Research","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127748855","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"How many coccoliths are there in a coccosphere of the extant coccolithophorids? A compilation.","authors":"Tien-Nan Yang, K. Wei","doi":"10.58998/jnr2275","DOIUrl":"https://doi.org/10.58998/jnr2275","url":null,"abstract":"Introduction As an important component in the biogeochemical cycling of carbon and sulphur, and of global climate change (Westbroek et al., 1993), production of coccolithophorids and their fluxes in the ocean have drawn much attention in recent years (e.g. Kleijne, 1991; Honjo, 1996; Andruleit, 1997; Ziveri & Broerse, 1997; Broerse et al., 2000a, b, c; Jordan & Winter, 2000; Sprengel et al., 2000; Ziveri & Thunell, 2000; Cortes et al., 2001; Haidar & Thierstein, 2001; Yang et al., 2001 ). To be able to quantitatively estimate the flux of coccolithophorids in the ocean system, it is often desirable to convert counts of coccoliths into coccospheres, or vice versa. For example, Kleijne (1991) and Knappertsbusch (1993) documented the distribution of standing crops of coccospheres of holococcolithophorids in the Indian Ocean, Red Sea, Mediterranean Sea and North Atlantic Ocean, and of coccolithophorids in the Mediterranean Sea, respectively, by converting the counted coccoliths to coccospheres using existing data of coccolith/coccosphere ratios. More recently, Broerse et al. (2000a, b, c) and Ziveri & Thunell (2000) compiled coccolith and coccolithophorid data, and converted the data eventually into carbonate mass flux, based upon the coccolith mass estimates ofYoung & Ziveri (2000). The conversions in these previous studies, however, were applied to limited numbers of species, based upon available data from published literature. To facilitate a more complete quantitative study of coccolithophorid standing crops, and their contribution to carbonate flux, not only ratios of coccoliths/coccosphere of all species needed to be documented, but also some basic questions needed to be addressed, for instance, is the ratio shown by each taxon constant? If not, does the ratio vary with different oceanographic settings, or is it solely a function of ontogenetic development? Furthermore, for some dimorphic and dithecate coccospheres, the number of different kinds of coccoliths should be converted separately depending upon whether the coccosphere is complete or not. Various functions of coccoliths have been hypothesised, including protection, biochemical convenience, flotation and light-regulation (see Young, 1994 for review, and references therein). Intraspecific variation is a notable phenomenon in cultured Emiliania huxleyi (Linschooten et al., 1991). They found that new daughter-cells were covered with an average of 8-10 coccoliths, but the number increased to 15-20 before the next cell-division. The number of coccoliths also varies with nutrient availability. Linschooten et al. (1991)","PeriodicalId":186533,"journal":{"name":"Journal of Nannoplankton Research","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127965553","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A new Oligocene Triquetrorhabdulus species: Triquetrorhabdulus longus sp. nov.","authors":"T. Blaj, J. Young","doi":"10.58998/jnr2020","DOIUrl":"https://doi.org/10.58998/jnr2020","url":null,"abstract":"While investigating the LO (Lowest Occurrence) of Triquetrorhabdulus carinatus at ODP Site 1218 in the paleo-equatorial Pacific, a form that resembles this species was observed and counted separate ...","PeriodicalId":186533,"journal":{"name":"Journal of Nannoplankton Research","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122198450","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"External and internal views of coccospheres: Notes on a new cracking technique.","authors":"T. Hildebrand-Habel, H. Mai","doi":"10.58998/jnr2121","DOIUrl":"https://doi.org/10.58998/jnr2121","url":null,"abstract":"","PeriodicalId":186533,"journal":{"name":"Journal of Nannoplankton Research","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130452649","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Nannosys.","authors":"A. Romein","doi":"10.58998/nina2211","DOIUrl":"https://doi.org/10.58998/nina2211","url":null,"abstract":"","PeriodicalId":186533,"journal":{"name":"Journal of Nannoplankton Research","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117035519","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Nannofossils and Upper Cretaceous (sub-)stage boundaries - state of the art.","authors":"J. Burnett","doi":"10.58998/jnr2041","DOIUrl":"https://doi.org/10.58998/jnr2041","url":null,"abstract":"","PeriodicalId":186533,"journal":{"name":"Journal of Nannoplankton Research","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130984187","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}