THE ABUNDANCE OF RECENT FORAMINIFERA IN SURFACE SEDIMENT OF AMBON BAY

2010 ◽  
Vol 2 (1) ◽  
Author(s):  
Suhartati M. Natsir
Keyword(s):  
Surface Sediment ◽  
Benthic Foraminifera ◽  
Sea Water ◽  
Planktonic Foraminifera ◽  
Sediment Characteristic ◽  
Abundance And Distribution

Foraminifera are generally live in sea water with various sizes. These organisms consist of planktonic and benthic foraminifera. Geological activity on plutonic and volcanic with vomiting magma is transpiring on, and then affects sedimentation and foraminiferal abundance of Ambon Bay. The study was determined to study the abundance and distribution of foraminifera based on the sediment characteristic of Ambon Bay. Sample collected in 2007 of Ambon Bay showed that only 29 samples of 50 samples containing foraminifera. The collected sediments have 86 species of foraminifera, consisting 61 species of benthic foraminifera and 25 species of planktonic foraminifera. The dominant benthic foraminifera in the surface sediment of Ambon bay were Amphistegina lessonii, Ammoniabeccarii,Elphidium craticulatum,Operculina ammonoides and Quinqueloculina parkery. The planktonic foraminifera that were frequently collected from the bay were Globorotalia tumida, Globoquadrina pseudofoliata, Globigerinoides pseudofoliata, Globigerinoides cyclostomus dan Pulleniatina finalis. Generally, the species dwelled as abundant on substrate sand, whereas the areas within substrate mud have no foraminifera lie on them. Keywords: Foraminifera, Abundance, Sediment, Ambon Bay

scholarly journals THE ABUNDANCE OF RECENT FORAMINIFERA IN SURFACE SEDIMENT OF AMBON BAY

2010 ◽  
Vol 2 (1) ◽  
Author(s):  
Suhartati M. Natsir
Keyword(s):  
Surface Sediment ◽  
Benthic Foraminifera ◽  
Sea Water ◽  
Planktonic Foraminifera ◽  
Sediment Characteristic ◽  
Abundance And Distribution

<p>Foraminifera are generally live in sea water with various sizes. These organisms consist of planktonic and benthic foraminifera. Geological activity on plutonic and volcanic with vomiting magma is transpiring on, and then affects sedimentation and foraminiferal abundance of Ambon Bay. The study was determined to study the abundance and distribution of foraminifera based on the sediment characteristic of Ambon Bay. Sample collected in 2007 of Ambon Bay showed that only 29 samples of 50 samples containing foraminifera. The collected sediments have 86 species of foraminifera, consisting 61 species of benthic foraminifera and 25 species of planktonic foraminifera. The dominant benthic foraminifera in the surface sediment of Ambon bay were Amphistegina lessonii, Ammoniabeccarii,Elphidium craticulatum,Operculina ammonoides and Quinqueloculina parkery. The planktonic foraminifera that were frequently collected from the bay were Globorotalia tumida, Globoquadrina pseudofoliata, Globigerinoides pseudofoliata, Globigerinoides cyclostomus dan Pulleniatina finalis. Generally, the species dwelled as abundant on substrate sand, whereas the areas within substrate mud have no foraminifera lie on them.</p> <p>Keywords: Foraminifera, Abundance, Sediment, Ambon Bay</p>

scholarly journals Sea Water Contamination in the Vicinity of the Italian Minor Islands Caused by Microplastic Pollution

Water ◽  
2018 ◽  
Vol 10 (8) ◽  
pp. 1108 ◽  
Author(s):  
Giuseppe de Lucia ◽  
Alvise Vianello ◽  
Andrea Camedda ◽  
Danilo Vani ◽  
Paolo Tomassetti ◽  
...  
Keyword(s):  
Water Contamination ◽  
Sea Water ◽  
Ethylene Vinyl Acetate ◽  
Average Density ◽  
Spectroscopy Analysis ◽  
Policy Makers ◽  
Plastic Films ◽  
Thin Plastic ◽  
Abundance And Distribution ◽  
River Mouths

The abundance and distribution of microplastics (MP) were evaluated in six “clean” sites (Italian minor islands) and in two “polluted” areas (near the mouth of two major Italian rivers). Samples of MP, plankton and persistent organic pollutants (POPs) were collected using a manta trawl (MA) and a plankton net (WP2), both lined with a 333 µm mesh net. MP have been confirmed to be ubiquitous since they were found at each site, showing an average density of 0.3 ± 0.04 items/m3 (values ranged from 0.641 to 0.119 ). When comparing the clean sites with the polluted ones, a significantly higher value of MP was found near the river mouths. The most common types of MP were synthetic filaments (50.24%), followed by fragments (30.39%), thin plastic films (16.98%) and spheres (2.39%). Infrared spectroscopy analysis highlighted that the most abundant polymers were polyethylene (PE-26%), polypropylene (PP-11%), polyethylene-terephthalate/polyester (PET/PEST-8%) and ethylene-vinyl-acetate (EVA-5%). Polychlorinated biphenyls and organochlorine pesticides were detected in all the samples with a high variability among sites and depths. This study adds to the existing information on the distribution of contaminants across the Mediterranean Sea, and is useful to policy makers who wish to implement effective measures to reduce MP pollution.

Biostratigraphy of Paleocene-Eocene deposits of the Ukrainian Carpathians based on planktonic foraminifera

2021 ◽  
Vol 3-4 (185-186) ◽  
pp. 56-64
Author(s):  
Svitlana Hnylko
Keyword(s):  
Benthic Foraminifera ◽  
Time Scale ◽  
Planktonic Foraminifera ◽  
Complete Sequence ◽  
Geological Time ◽  
Geological Time Scale ◽  
The Carpathians ◽  
Geological Maps ◽  
Sponge Spicules

Paleogene deposits are the main reservoir of hydrocarbon resources in the Carpathians and creation of the modern stratigraphic scheme of these deposits is the basis for improving the efficiency of geological search works. The reliable stratification is a necessary precondition for the preparation of geological maps. Stratification of the Paleocene–Eocene sediments is provided by foraminifera, nannoplankton, dinocysts, radiolarians, sponge spicules, palynoflora. Planktonic foraminifera is the main stratigraphic group of the Paleogene fauna. In the predominantly non-calcareous flysch of the Paleocene–Eocene of the Carpathians, mainly agglutinated benthic foraminifera of siliceous composition are developed. Planktonic foraminifera are distributed locally – in calcareous facies. The most complete sequence of Paleocene–Eocene planktonic foraminifera is represented in the Metova Formation (the Vezhany nappe of the Inner Carpathians). The results of own researches of natural sections of sediments distributed within the Magursky, Monastyretsky and Vezhany nappes of the Ukrainian Carpathians together with the analysis of literature sources are used. The article presents a generalized biozonal division of the Paleocene–Eocene of the Ukrainian Carpathians by planktonic foraminifera. On the basis of certain correlation levels, a comparison with the Geological Time Scale was made. The Parvularugoglobigerina eugubina Zone (lowermost Danian), Globoconusa daubjergensis Zone (middle Danian), Praemurica inconstans Zone (upper Danian); Morozovella angulata Zone (lower Selandian); Globanomalina pseudomenardii Zone fnd Acarinina acarinata Zone (upper Selandian–Thanetian); Morozovella subbotinae Zone (lower Ypresian), Morozovella aragonensis Zone (upper Ypresian); Acarinina bullbrooki Zone (lower Lutetian), Acarinina rotundimarginata Zone (upper Lutetian); Hantkenina alabamensis Zone (Bartonian); Globigerinatheka tropicalis Zone (lower Priabonian) and Subbotina corpulenta Zone (upper Priabonian) based on planktonic foraminifera are characterized in studied deposits.

scholarly journals Bioerosion by microbial euendoliths in benthic foraminifera from heavy metal-polluted coastal environments of Portovesme (south-western Sardinia, Italy)

2012 ◽  
Vol 9 (11) ◽  
pp. 4607-4620 ◽  
Author(s):  
A. Cherchi ◽  
C. Buosi ◽  
P. Zuddas ◽  
G. De Giudici
Keyword(s):  
Heavy Metal ◽  
Benthic Foraminifera ◽  
Sea Water ◽  
Industrial Area ◽  
Pollution Source ◽  
Coastal Environments ◽  
Molar Ratios ◽  
Structural Types ◽  
Monitoring Survey ◽  
Mg Content

Abstract. A monitoring survey of the coastal area facing the industrial area of Portoscuso-Portovesme (south-western Sardinia, Italy) revealed intense bioerosional processes. Benthic foraminifera collected at the same depth (about 2 m) but at different distances from the pollution source show extensive microbial infestation, anomalous Mg/Ca molar ratios and high levels of heavy metals in the shell associated with a decrease in foraminifera richness, population density and biodiversity with the presence of morphologically abnormal specimens. We found that carbonate dissolution induced by euendoliths is selective, depending on the Mg content and morpho-structural types of foraminiferal taxa. This study provides evidences for a connection between heavy metal dispersion, decrease in pH of the sea-water and bioerosional processes on foraminifera.

Benthic Foraminifera Across the Cretaceous/Paleogene Boundary in the Eastern Tethys (Northern Alborz, Galanderud Section): Extinction Pattern and Paleoenvironmental Reconstruction

2020 ◽  
Vol 50 (1) ◽  
pp. 25-40 ◽  
Author(s):  
Masoud A. Rostami ◽  
Fabrizio Frontalini ◽  
R. Mark Leckie ◽  
Rodolfo Coccioni ◽  
Eric Font ◽  
...  
Keyword(s):  
Species Richness ◽  
Benthic Foraminifera ◽  
Oxygen Index ◽  
Major Change ◽  
Partial Recovery ◽  
Paleoenvironmental Reconstruction ◽  
The Third ◽  
Paleoenvironmental Changes ◽  
Abundance And Distribution ◽  
Depositional Setting

Abstract Extinction patterns, paleobathymetric inferences, and paleoenvironmental changes based on benthic foraminifera were investigated across the Cretaceous/Paleogene (K/Pg) boundary at the Galanderud section (Northern Alborz, Iran), which contains one of the most continuous and expanded K/Pg transitions in the eastern Tethys. On the basis of benthic foraminiferal taxa abundance and distribution, an outer neritic to uppermost bathyal paleo-depositional setting is inferred. In addition, benthic foraminiferal assemblages and planktic/benthic ratios do not indicate any major change in relative sea level during latest Maastrichtian-early Danian time. Changes in benthic foraminiferal assemblages, morphotypes, diversity, heterogeneity, and benthic foraminiferal oxygen index, coupled with statistical analyses, define three intervals. In the first interval (uppermost Maastrichtian Plummerita hantkeninoides Zone), benthic foraminiferal assemblages are moderately to well preserved and highly diverse, with a combination of epibenthic and endobenthic taxa indicating stable, mesotrophic to weakly eutrophic, normal marine conditions. A major change in benthic foraminiferal assemblages at the K/Pg boundary defines a second interval (basal Danian Guembelitria cretacea and lower part of Parvularugoglobigerina eugubina Zones) that is marked by a decrease in the endobenthic morphogroups as well as a decrease in diversity, heterogeneity, genus and species richness. This second interval denotes highly oligotrophic conditions and a collapse in productivity and food availability due to the extinction of some primary producers, with the exception of the three chalk beds representing short-lived blooms of calcareous dinoflagellates. Benthic foraminifera do not show significant extinction at the end of the Cretaceous at this section with only about an 8% loss of species. Additionally, the abundance of some opportunistic species, including Cibicidoides pseudoacutus and Tappanina selmensis, may reflect instability in the benthic foraminiferal assemblages. The third interval (middle-upper part of the Pv. eugubina Zone) is characterized by the dominance of epibenthic morphogroups (up to 70% of the assemblages) with a partial recovery of endobenthic groups. The characteristics of the benthic foraminiferal assemblages indicate that the flux of food to the benthos had not fully recovered during the early Danian.

Pliocene foraminifera and environments, Limon Basin of Costa Rica

1989 ◽  
Vol 63 (2) ◽  
pp. 146-157 ◽  
Author(s):  
David T. Cassell ◽  
Barun K. Sen Gupta
Keyword(s):  
Costa Rica ◽  
Benthic Foraminifera ◽  
Depositional Environment ◽  
Planktonic Foraminifera ◽  
Environmental Parameters ◽  
Common Species ◽  
Multiple Group ◽  
Marine Current ◽  
Sandstone Facies ◽  
Transported Material

The sandstone facies of the Pliocene Rio Banano Formation of eastern Costa Rica contains benthic foraminifera indicative of an open marine, current-swept, neritic depositional environment. These sandstones and associated siltstones are placed in Zone N18 on the basis of overlapping ranges of planktonic foraminifera, particularly Globigerinoides obliquus extremus and G. ruber, and a short-ranging ostracode species, Radimella ovata. One hundred and eight species of benthic foraminifera have been identified from the formation. A multiple-group-component factor analysis of abundance distributions of several dominant or common species (Amphistegina gibbosa, Articulina mayori, Cassidulina laevigata, C. subglobosa, Cibicidoides floridanus, Elphidium discoidale, Hanzawaia concentrica, Pararotalia sarmientoi, Pseudononion basispinata, Quinqueloculina lamarckiana, Rosalina globularis, and Trifarina angulosa) in the type section aided in the recognition of three benthic foraminiferal assemblages related to environmental parameters. An open marine, shallow, sandy continental shelf environment is suggested by the first assemblage. This is considered the typical depositional environment of the unit. The second and the third assemblages, suggesting an inner littoral environment and the proximity to a reef, respectively, also indicate introduction of significant amount of transported material into the thanatotopes.

Micropaleontological proxies as tool to date serpentinite mud volcanisms and seamount subduction and to reconstruct paleoenvironmental conditions in the Mariana convergent margin system (IODP Expedition 366)

2020 ◽  
Author(s):  
Arianna Valentina Del Gaudio ◽  
Werner E. Piller ◽  
Gerald Auer ◽  
Patrick Grunert ◽  
Walter Kurz
Keyword(s):  
Benthic Foraminifera ◽  
Planktonic Foraminifera ◽  
Detailed Comparison ◽  
Extreme Environment ◽  
Tropical Species ◽  
Calcareous Nannofossils ◽  
Pelagic Sediment ◽  
Convergent Margin ◽  
Flow Activity ◽  
Mud Flow

&lt;p&gt;The Mariana forearc system represents the only known currently active serpentine mud volcanism in a convergent margin setting. Here, International Ocean Discovery Program (IODP) Expedition 366 recovered material from three serpentinite mud volcanoes at increasing distances from the Mariana trench subduction zone along a south-to-north transect: Yinazao (Blue Moon), Fantangis&amp;#241;a (Celestial), and As&amp;#249;t Tesoru (Big Blue). Cores contain serpentinite mud with lithic clasts from the subducting Pacific Plate, forearc crust and mantle. Furthermore, at almost all drilled sites, a thin cover of pelagic sediment containing planktic and benthic foraminifera, calcareous nannofossils, radiolaria and sponge spicules was recovered, constraining the most recent mud volcano activity. The base of the seamounts overlies pelagic sediment and volcanic ash/tephra layers which establish a maximum age for the mud activity. Additionally, separate serpentinite mud flows are intercalated by distinct sedimentary layers.&lt;/p&gt;&lt;p&gt;Integrated biostratigraphy, based on planktonic foraminifera and calcareous nannofossils, is used to assess the minimum and maximum age of mud flow activity and of the distinct sedimentary layers and serpentinite mud flow layers. Biostratigraphic information will also provide time indications on lower plate dehydration and serpentinization of the forearc wedge. Preliminary results from Fantangis&amp;#241;a seamount (Site U1497 and U1498) reveal the existence of biostratigraphic marker species for both planktonic foraminifera and calcareous nannofossils. Specifically, the presence of &lt;em&gt;Globigerinella calida&lt;/em&gt;, &lt;em&gt;Globorotalia flexuosa&lt;/em&gt;, &lt;em&gt;Globorotalia truncatulinoides&lt;/em&gt;, &lt;em&gt;Globorotalia tumida&lt;/em&gt;, &lt;em&gt;Sphaeroidinella dehiscens&lt;/em&gt; (amongst planktic foraminifera) and &lt;em&gt;Gephyrocapsa&lt;/em&gt; spp., &lt;em&gt;Pseudoemiliania lacunosa&lt;/em&gt;, &lt;em&gt;Reticulofenestra asanoi&lt;/em&gt;, &lt;em&gt;Discoaster deflandrei&lt;/em&gt;, &lt;em&gt;Discoaster variabilis&lt;/em&gt; (amongst calcareous nannofossils) allow a possible age assessment from Late Pleistocene to Late Miocene.&lt;/p&gt;&lt;p&gt;Planktonic assemblages are dominated by (sub)tropical Globigerinoides forms such as &lt;em&gt;G. conglobatus&lt;/em&gt;, &lt;em&gt;G. ruber&lt;/em&gt;, &lt;em&gt;G. elongatus&lt;/em&gt;, &lt;em&gt;G. sacculifer&lt;/em&gt;, &lt;em&gt;G. trilobus&lt;/em&gt;. Other common (sub)tropical species detected are G&lt;em&gt;. menardii&lt;/em&gt;, and &lt;em&gt;O. universa&lt;/em&gt;, whereas &lt;em&gt;G. siphonifera&lt;/em&gt;, &lt;em&gt;N. dutertrei&lt;/em&gt;, &lt;em&gt;S. dehiscens&lt;/em&gt; and &lt;em&gt;P. obliquiloculata&lt;/em&gt; are less common.&lt;/p&gt;&lt;p&gt;Benthic foraminifera are less abundant but show high diversity. Forms of &lt;em&gt;Lagena&lt;/em&gt;, &lt;em&gt;Cibicidoides&lt;/em&gt;, &lt;em&gt;Fissurina&lt;/em&gt;, &lt;em&gt;Ehrenbergina&lt;/em&gt;, &lt;em&gt;Gyroidina&lt;/em&gt;, &lt;em&gt;Melonis&lt;/em&gt;, &lt;em&gt;Pullenia&lt;/em&gt;, &lt;em&gt;Osangularia&lt;/em&gt;, &lt;em&gt;Favulina&lt;/em&gt;, &lt;em&gt;Reophax&lt;/em&gt;, &lt;em&gt;Rhabdammina&lt;/em&gt;, &lt;em&gt;Saccorhiza&lt;/em&gt;, and &lt;em&gt;Hormosinella&lt;/em&gt; are present. To the best of our knowledge, the occurrence of benthic forms in such environments is highly unusual and has not been recorded in detail so far.&lt;/p&gt;&lt;p&gt;Quantitative and statistical analyses on foraminifera assemblages will provide information on water column and bottom water conditions. Moreover, a detailed comparison between assemblages pre- and post-volcanism may reflect possible changes in the ecological conditions.&lt;/p&gt;&lt;p&gt;Collected data will not only allow to constrain in time the evolution of submarine volcanoes in the Mariana convergent system but also to investigate foraminifera ecology in such an extreme environment.&lt;/p&gt;&lt;p&gt;&amp;#160;&lt;/p&gt;

scholarly journals Impact of seawater <i>p</i>CO<sub>2</sub> on calcification and Mg/Ca and Sr/Ca ratios in benthic foraminifera calcite: results from culturing experiments with <i>Ammonia tepida</i>

2010 ◽  
Vol 7 (1) ◽  
pp. 81-93 ◽  
Author(s):  
D. Dissard ◽  
G. Nehrke ◽  
G. J. Reichart ◽  
J. Bijma
Keyword(s):  
Carbon Dioxide ◽  
Calcium Carbonate ◽  
Benthic Foraminifera ◽  
Inorganic Carbon ◽  
Dissolved Inorganic Carbon ◽  
Planktonic Foraminifera ◽  
Ambient Conditions ◽  
Precipitated Calcium Carbonate ◽  
Shell Weight ◽  
Dissolved Carbon

Abstract. Evidence of increasing concentrations of dissolved carbon dioxide, especially in the surface ocean and its associated impacts on calcifying organisms, is accumulating. Among these organisms, benthic and planktonic foraminifera are responsible for a large amount of the globally precipitated calcium carbonate. Hence, their response to an acidifying ocean may have important consequences for future inorganic carbon cycling. To assess the sensitivity of benthic foraminifera to changing carbon dioxide levels and subsequent alteration in seawater carbonate chemistry, we cultured specimens of the shallow water species Ammonia tepida at two concentrations of atmospheric CO2 (230 and 1900 ppmv) and two temperatures (10 °C and 15 °C). Shell weights and elemental compositions were determined. Impact of high and low pCO2 on elemental composition are compared with results of a previous experiment were specimens were grown under ambient conditions (380 ppvm, no shell weight measurements of specimen grown under ambient conditions are, however, available). Results indicate that shell weights decrease with decreasing [CO32−], although calcification was observed even in the presence of calcium carbonate under-saturation, and also decrease with increasing temperature. Thus both warming and ocean acidification may act to decrease shell weights in the future. Changes in [CO32−] or total dissolved inorganic carbon do not affect the Mg distribution coefficient. On the contrary, Sr incorporation is enhanced under increasing [CO32−]. Implications of these results for the paleoceanographic application of foraminifera are discussed.

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