scholarly journals Palynology of the dinosaur beds of Tendaguru (Tanzania) — preliminary results

Fossil Record ◽  
1999 ◽  
Vol 2 (1) ◽  
pp. 171-183 ◽  
Author(s):  
E. Schrank
Keyword(s):  
Marine Environment ◽  
Aquatic Environment ◽  
Freshwater Algae ◽  
Preliminary Results ◽  
Rare Elements ◽  
Palynological Assemblages ◽  
Terrestrial Source ◽  
Marine Influence ◽  
Abundant Element ◽  
Angiosperm Pollen

The Tendaguru Beds, southeastern Tanzania, have yielded two palynological assemblages of Kimmeridgian to Tithonian age: (1) the <i>Anapiculatisporites-Densoisporites-Trisaccites</i> assemblage from the Middle Saurian Beds and (2) the <i>Barbatacysta-Pareodinia</i> assemblage from the overlying <i>Smeei</i> Beds. A third assemblage with <i>Rhizophagites</i> and rare angiosperm pollen from the Upper Saurian Beds is contaminated by recent and subrecent material. <br><br> The <i>Anapiculatisporites-Densoisporites-Trisaccites</i> assemblage is characterized by the presence of freshwater algae (<i>Ovoidites</i>), pteridopyhtic-bryophytic spores and gymnosperm (conifer) pollen, with <i>Classopollis</i> as the most abundant element. Among the rare elements of this assemblage is the questionable dinoflagellate <i>Mendicodinium</i>? <i>quadratum</i>, possibly a Kimmeridgian-Tithonian marker. The miospores show palaeobiogeographic links to Southern Gondwana, especially Madagascar, Australia, Argentina and India. Deposition of this assemblage took place in an aquatic environment with strong palynological influx from a terrestrial source and questionable marine influence. <br><br> The <i>Barbatacysta-Pareodinia</i> assemblage contains a considerable number of dinoflagellates suggesting deposition in a marine environment. The terrestrially-derived miospores are impoverished and dominated by conifer pollen, while pteridophytic-bryophytic spores form a very subordinate element or are absent. <br><br> Die Tendaguru-Schichten, Südost-Tansania, haben zwei palynologische Assoziationen, deren Alter als Kimmeridge bis Tithon interpretiert wird, geliefert. Die <i>Anapiculatisporites-Densoisporites-Trisaccites</i>-Assoziation stammt aus den Mittleren Saurierschichten, und die <i>Barbatacysta-Pareodinia</i>-Assoziation charakterisiert die darüberlagernden <i>Smeei</i>-Schichten. Eine dritte Vergesellschaftung mit <i>Rhizophagites</i> und seltenen Angiospermen-Pollen aus den Oberen Saurierschichten ist durch rezentes bis subrezentes Material kontaminiert. <br><br> Die <i>Anapiculatisporites-Densoisporites-Trisaccites</i>-Assoziation ist durch die Anwesenheit von Süßwasser-Algen (<i>Ovoidites</i>), Pteridophyten-Bryophyten-Sporen und Gymnospermen-Pollen (Koniferen) gekennzeichnet mit <i>Classopollis</i> als dem häufigsten Element. Zu den seltenen Elementen dieser Assoziation gehört der fragliche Dinoflagellat <i>Mendicodinium</i>? <i>quadratum</i>, der möglicherweise als leitend für das Kimmeridge-Tithon angesehen werden kann. Die Miosporen zeigen paläobiogeographische Verbindungen nach Südgondwana, besonders nach Madagaskar, Australien, Argentinien und Indien. Das Ablagerungsmilieu dieser Assoziation war aquatisch mit starker Zufuhr von terrigenem Material, während mariner Einfluß fraglich ist. <br><br> Die Dinoflagellaten-führende <i>Barbatacysta-Pareodinia</i>-Assoziation wurde in einem marinen Milieu gebildet, in dem die Zufuhr terrigener Palynomorphe reduziert und im wesentlichen auf Koniferen-Pollen beschränkt war, während Pteridophyten-Bryophyten-Sporen nur sehr untergeordnet vorkommen oder ganz fehlen. <br><br> doi:<a href="http://dx.doi.org/10.1002/mmng.1999.4860020113" target="_blank">10.1002/mmng.1999.4860020113</a>

scholarly journals Palynology of the Cenomanian Raha Formation, Gulf of Suez, Egypt: Biostratigraphical, palaeoenvironmental and palaeobiogeographical implications

2018 ◽  
Vol 111 (1) ◽  
pp. 135-154 ◽  
Author(s):  
Omar Mohamed ◽  
Ahmed Mansour ◽  
Sameh S. Tahoun ◽  
Ashraf M. T. Elewa ◽  
Muhammad Ali Mekkey
Keyword(s):  
Marine Environment ◽  
Oil Field ◽  
Gulf Of Suez ◽  
Freshwater Algae ◽  
Physical Barrier ◽  
Shallow Marine ◽  
Floral Variation ◽  
Assemblage Zone ◽  
Pollen And Spores ◽  
Angiosperm Pollen

AbstractThe current study presents a fully qualitative palynological investigation carried out on the Raha Formation encountered from three wells in the Bakr Oil Field of the Gulf of Suez, Egypt. Around 30 species of pteridophytic spores, 26 species of angiosperm pollen, 24 species of gymnosperm pollen and 27 species of dinoflagellate cysts have been recorded. However, achritarchs, microforaminiferal test linings and freshwater algae are impoverished and sparsely documented throughout the Raha Formation. Two palynozones have been identified based on some stratigraphically significant pollen and spores, arranged from youngest to oldest: (1) Palynozone I (Classopollis brasiliensis–Tricolpites sagax Assemblage Zone) of late Cenomanian age; (2) Palynozone II (Afropollis jardinus–Crybelosporites pannuceus Assemblage Zone) of early-middle Cenomanian age. The distribution and ecological affiliation of specific palynomorph species, as well as various palynofacies parameters, are interpreted. A shallow marine environment from supratidal to distal inner neritic under proximal suboxic–anoxic to dysoxic–anoxic shelf conditions is reconstructed. Palaeobiogeographically, the absence of elaters from the recovered taxa is interpreted in terms of minor floral variation. This may be attributed to climatic and/or an environment-controlled niche establishment, which possibly was shaped by the existence of a physical barrier hindering the distribution of such type of elaterate parent plants.

An experimental approach to the determinants of biological water quality

1979 ◽  
Vol 286 (1015) ◽  
pp. 465-481 ◽  
Keyword(s):  
Water Quality ◽  
Marine Environment ◽  
Water Samples ◽  
Experimental Approach ◽  
Sea Water ◽  
Preliminary Results ◽  
Biological Water ◽  
Chemical Techniques ◽  
Swansea Bay ◽  
Biological Water Quality

A case is presented for the use of experimental bioassay techniques to detect and measure variations in water quality in the marine environment by exposing suitable organisms in the laboratory to water samples collected in the field. A technique is described which was developed for this purpose with the use of a clonal hydroid; preliminary results from Swansea Bay show that it is sensitive to the variations in water quality that occur there. Chemical techniques are being developed for use in conjunction with such bioassays to identify the kinds of contaminants responsible for a detected effect, and some preliminary experiments suggest that divalent metals and the volatile constituents of hydrocarbons can be removed selectively from sea water.

scholarly journals Palynological evidence for a diachronous low-salinity event in the C–T boundary clay at Stevns Klint, Denmark

1987 ◽  
Vol 6 (2) ◽  
pp. 35-40 ◽  
Author(s):  
Stefan U. Hultberg
Keyword(s):  
Frequency Distribution ◽  
Geographical Area ◽  
Freshwater Algae ◽  
Dinoflagellate Cysts ◽  
Low Salinity ◽  
Vertical Change ◽  
Palynological Assemblages ◽  
Fish Clay

Abstract. The frequency distribution of dinoflagellate cysts, miospores, and freshwater algae has been studied in 70 samples from the Fish Clay at Stevns Klint, eastern Denmark. The palynological assemblages change both vertically and laterally. The vertical change is from a strictly marine assemblage in the Cretaceous chalk to a freshwater or brackish assemblage in the Fish Clay. The lateral change indicates that the Fish Clay was deposited diachronously, even within the limited geographical area covered by the Stevns Klint section.

scholarly journals Palynostratigraphy, palynofacies and depositional environment of a lignite-bearing succession at Surkha Mine, Cambay Basin, north-western India

2015 ◽  
Vol 55 (2) ◽  
pp. 183-207 ◽  
Author(s):  
Priyanka Monga ◽  
Madhav Kumar ◽  
Vandana Prasad ◽  
Yogesh Joshi
Keyword(s):  
Depositional Environment ◽  
Coastal Region ◽  
Pollen Grains ◽  
Carbonaceous Shale ◽  
Western India ◽  
Freshwater Algae ◽  
Dinoflagellate Cyst ◽  
Depositional Settings ◽  
Freshwater Swamp ◽  
Angiosperm Pollen

Abstract The paper reports palynology and palynofacies studies of lignite-bearing sediments exposed in an opencast mine succession at Surkha, Bhavnagar District, in the coastal region of Gujarat, India. The study examined the relationships between the palynoflora, sedimentary organic matter and environment at the time of deposition of lignite and associated sediments. Based on dinoflagellate cyst biostratigraphy, the sedimentary succession is dated as early Eocene (Ypresian). Palynofacies studies helped reveal the palaeoenvironmental fluctuations. The dominance of angiosperm pollen grains, freshwater algae, microthyraceous fungi and a large share of land debris in the lower part of the succession suggests a freshwater swamp environment of deposition for the basal lignite facies. Two cenozones - Matanomadiasulcites maximus and Lakiapollis ovatus - were identified in the lower lignite facies, determined from the dominance of these pollen grains in the palynological assemblages. The presence of angiosperm pollen grains and pteridophyte spores in the carbonaceous shale horizon above the lignite facies indicates a change in the depositional regime from freshwater swamp to lagoonal. This was identified as the Arecipites wodehousei cenozone due to its numerical abundance in the assemblage. Dinoflagellate cyst abundance and diversity, and microforaminiferal test linings along with well-sorted terrestrial debris in the mudstone in the upper part of the succession suggest a more open marine estuarine type of depositional environment. The Homotryblium complex along with Cordospheridium fibrospinosum, Kenleyia sp., and Thalassiphora pelagica dinoflagellate cysts are the main representatives of this zone, determined as the Homotryblium tenuispinosum cenozone. The changing depositional settings (freshwater swamp-lagoonal-estuarine) along the vertical succession indicate a marine transgression in this region. Results from palynological studies of early Palaeogene successions of the Cambay and Kutch basins correlate well with the present findings.

Simulation of Deployment Process of Junction Box

2013 ◽  
Vol 300-301 ◽  
pp. 294-300 ◽  
Author(s):  
Fan Yi Xia ◽  
De Jun Li ◽  
Ji Yuan Zhang
Keyword(s):  
Marine Environment ◽  
Dynamic Characteristics ◽  
Virtual Prototype ◽  
Correct Position ◽  
Preliminary Results ◽  
Scientific Support ◽  
Adams Software ◽  
Cabled Seafloor Observatory ◽  
Seafloor Observatory

Junction box is an important part of cabled seafloor observatory. And it should be deployed to correct position safely, smoothly and precisely. A model of virtual prototype simulation is put forward in this paper to analyze the dynamic characteristics of the deployment process in Marine Environment. The analysis is focus on the influence of different sea condition and different vibrating movement of ship caused by the wave, as well as the some important deploying parameters during the deployment process. The preliminary results of the simulation with ADAMS software provides scientific support for deployment system designers and operators to refer to.

scholarly journals The effects of zinc pyrithione on total hemocyte counts of mussel (Mytilus galloprovincialis Lamarck, 1819)

2019 ◽  
Vol 36 (2) ◽  
pp. 185-189
Author(s):  
Selma Katalay ◽  
Melike Merve Ayhan ◽  
Aysel Çağlan Günal
Keyword(s):  
Marine Environment ◽  
Aquatic Environment ◽  
Mytilus Galloprovincialis ◽  
Environmental Pollutants ◽  
Control Group ◽  
Zinc Pyrithione ◽  
Low Concentrations ◽  
Total Hemocyte Count ◽  
Hemocyte Count

In this study, the effect of Mediterranean mussels (Mytilus galloprovincialis) which accumulate contaminants in the marine environment exposed to 20 and 40 µg/Lsublethal zinc pyrithion (ZnPT) at high levels for 48 and 96 hours on total hemocyte counts was determined. Total hemocyte count is a good bioindicator to assess the effects of environmental pollutants . It was determined that total hemocyte counts were increased in mussels exposed to zinc pyrithione when compared to the control group (p<0.05). It has been found that this substance, which has different usage areas and contaminate aquatic environment, negatively effect the mussels even in low concentrations.

scholarly journals Potensi Rumput Laut di Perairan Seram Timur, Kabupaten Seram Bagian Timur , Maluku

2021 ◽  
Vol 19 (3) ◽  
pp. 497-510
Author(s):  
Marsya Jaqualine Rugebregt ◽  
Ferdinand Pattipeilohy ◽  
Caleb Matuanakotta ◽  
Ahmad Ainarwowan
Keyword(s):  
Marine Environment ◽  
Aquatic Environment ◽  
Environmental Parameters ◽  
Economic Potential ◽  
Seaweed Cultivation ◽  
Transect Line ◽  
Sampling Locations

Makroalgae termasuk bagian dari flora yang terdiri atas banyak jenis dan memiliki peranan penting pada lingkungan laut salah satunya adalah Perairan Pulau Keffing di Kecamatan Seram bagian Timur, Kabupaten Seram Bagian Timur. Penelitian dilaksanakan pada November 2017. Metode yang digunakan pada penelitian ini adalah metode eksplorasi dengan pengambilan sampel secara line transek kuadrat. Lokasi pengambilan sampel dibedakan menjadi tiga stasiun. Jumlah jenis algae yang dijumpai dalam penelitian ini sebanyak 16 jenis yang terdiri atas 9 jenis dari kelas algae Chlorophyta, satu jenis dari kelas Phaeophyta dan enam jenis dari kelas Rhodophyta. Jenis-jenis yang ditemukan memiliki potensi ekonomi, baik kepada lingkungan periaran maupun kepada manusia, namun pemanfaatannya belum dioptimalkan oleh masyarakat karena sebagian hanya dimanfaatkan untuk makanan. Dari hasil pengukuran parameter lingkungan menunjukan masih sesuai bagi pertumbuhan rumput laut. Perairan pulau Keffing dan sekitarnya memiliki kemungkinan untuk dikembangkannya kegiatan usaha budidaya rumput laut serta pengembangan pengolahan potensinya. AbstractMacroalgae is part of the flora consists of many types and has an important role in the marine environment, one of which is the waters of Keffing Island in the East Seram District, East Seram District. The research was carried out in November 2017. The method used in this study is an exploratory method by taking a sample using a quadratic transect line. The sampling locations were divided into three stations. The number of algae species found in this study was 16 species consisting of 9 species from the Chlorophyta class, one from the Phaeophyta class, and six species from the Rhodophyta class. The species found have economic potential, both for the aquatic environment and for humans, but their utilization has not been optimized by the community because some of them are only used for food. The results of the measurement of environmental parameters show that it is still suitable for seaweed growth. The waters of Keffing Island and its surroundings have the possibility for the development of seaweed cultivation activities and the development of processing potential.

scholarly journals Assessing the Diversity of Marine Bacterial β-Glucosidases by Capillary Electrophoresis Zymography

2001 ◽  
Vol 67 (10) ◽  
pp. 4896-4900 ◽  
Author(s):  
Jesús M. Arrieta ◽  
Gerhard J. Herndl
Keyword(s):  
Capillary Electrophoresis ◽  
Kinetic Parameters ◽  
North Sea ◽  
Marine Environment ◽  
Bacterial Communities ◽  
Environmental Samples ◽  
New Method ◽  
Preliminary Results ◽  
Fast Separation ◽  
Substrate Concentrations

ABSTRACT We propose a new method for the fast separation and detection of β-glucosidases in environmental samples. With this approach, β-glucosidases extracted from bacteria are evidenced by substrate-incorporated capillary electrophoresis (CE zymography) and their kinetic parameters can be determined by repeated injections using different substrate concentrations. Preliminary results obtained with natural bacterial communities from the coastal North Sea suggest that the diversity of β-glucosidases in the marine environment might be much higher than previously observed.

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