Multiproxies (Benthic Foraminifera, Ostracods and Biopolymers) Approach Applied to Identify the Environmental Partitioning of the Guadiana River Estuary (Iberian Peninsula)

Laut, Lázaro; Clemente, Iara; Belart, Pierre; Martins, Maria Virgínia Alves; Frontalini, Fabrizio; Laut, Vaness Mattos; Gomes, Ana; Boski, T.; Lorini, Maria Lúcia; Fortes, Rafael; Rodrigues, Maria Antonieta da Conceição

doi:10.12957/jse.2016.22534

Cited by 20 publications

(19 citation statements)

References 38 publications

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“…At the same time, stressed foraminiferal assemblages indicate unstable palaeoenvironmental conditions likely related to low salinity, high organic matter content, and low oxygen concentrations typical of the innermost portion of Mediterranean coastal lagoons (Alves Martins et al, 2016). In the following samples, a great faunal turnover to oligohaline ostracod assemblages reveals relevant freshwater inputs in a restricted environment, in proximity to the innermost portion of the lagoon.…”

Section: Evolution Of the Palaeolagoon: The Combined Approach Of Bentmentioning

confidence: 93%

“…Nevertheless, benthic foraminifera could be absent in environments characterized by strong fluctuations in salinity, organic matter, and hydrodynamic conditions (Laut et al, 2016;Pint and Frenzel, 2017). Conversely, ostracoda are abundant from freshwater to hyperhaline environments and guarantee a great continuity of palaeoecological information (Rodriguez-Lazaro and Ruiz-Muñoz, 2012).…”

Section: Introductionmentioning

confidence: 99%

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Benthic foraminifera or Ostracoda? Comparing the accuracy of palaeoenvironmental indicators from a Pleistocene lagoon of the Romagna coastal plain (Italy)

Barbieri

Vaiani

2018

J. Micropalaeontol.

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Abstract. Integrated analyses of multiple groups of microfossils are frequently performed to unravel the palaeoenvironmental evolution of subsurface coastal successions, where the complex interaction among several palaeoecological factors can be detected with benthic assemblages. This work investigates the palaeoenvironmental resolution potential provided by benthic foraminifera and ostracoda within a Pleistocene lagoonal succession of the Romagna coastal plain (northern Italy). Quantitative approaches and statistical techniques have been applied to both groups in order to understand the main factors that controlled the composition of assemblages and compare the palaeoecological record provided by single fossil groups.The two faunal groups are characterized by the high dominance of opportunistic species (Ammonia tepidaAmmonia parkinsoniana and Cyprideis torosa); however, detailed palaeoecological information is inferred from less common taxa. Benthic foraminiferal assemblages are mainly determined by the frequencies of abnormal individuals and species related to high concentrations of organic matter, showing two assemblages: a stressed assemblage, consistent with a brackish-water environment subject to salinity and oxygen fluctuations, and an unstressed assemblage, which indicates more stable conditions. Despite the lower number of species, ostracoda show more significant differences in terms of species composition and ecological structure between their three assemblages, formed in response to a salinity gradient and indicative of inner, central, and outer lagoon conditions. The stratigraphic distribution of ostracod assemblages shows a general transgressive-regressive trend with minor fluctuations, whereas benthic foraminifera highlight the presence of a significant palaeoenvironmental stress.In this case, the higher abundance along the stratigraphic succession, the higher differentiation of the assemblages, and the well-defined relationship between taxa and ecological parameters determine Ostracoda as the most reliable fossil group for precise palaeoenvironmental reconstructions. Nevertheless, benthic foraminifera indicate palaeoenvironmental stress and can be used to refine the environmental interpretation in the presence of monospecific ostracod assemblages.

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Section: Evolution Of the Palaeolagoon: The Combined Approach Of Bentmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Benthic foraminifera or Ostracoda? Comparing the accuracy of palaeoenvironmental indicators from a Pleistocene lagoon of the Romagna coastal plain (Italy)

Barbieri

Vaiani

2018

J. Micropalaeontol.

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“…Kfouri-Cardoso et al, 2006;Laut et al, 2012;Pereira et al, 2006;Figueira et al, 2007;Vilela et al, 2001Vilela et al, a, b, 2003Vilela et al, , 2004Vilela et al, , 2007Vilela et al, , 2011Donnici et al, 2012;Eichler et al, 2013;Clemente et al, 2015;Baptista Neto et al, 2016) as well as in other Brazilian (e.g., Brönnimann et al, 1981;Bonetti and Eichler, 1997;Raposo et al, 2016), and worldwide (Murray, 1991(Murray, , 2006Laut et al, 2014Laut et al, , 2016Martins et al, 2015Martins et al, a, b, 2016 transitional coastal environments. Laut et al (2012b) based on published works gave an overview of the main species that occur in the Guanabara Bay.…”

Section: The Benthic Foraminiferal Response To Toc Enrichment and Gasmentioning

confidence: 99%

High-Resolution Acoustic Mapping of Gas Charged Sediments and Living Benthic Foraminifera Assemblages From the Ne Region of the Guanabara Bay (Rj, Brazil)

et al. 2016

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. High-resolution acoustic mapping of gas charged sediments and living benthic foraminifera assemblages from the NE region of the Guanabara Bay (RJ, Brazil). Journal of Sedimentary Environments, 1 (3): 360-384. AbstractThis work was performed in the NE region of the Guanabara Bay, a highly impacted Brazilian coastal system, located in Rio de Janeiro State. It aimed to: i) identify and map the areas with occurrence of gas in the sediment, as well as its acoustic signature; ii) characterize the physical properties of the sediments and; iii) document the response of microbenthic organisms (living benthic foraminifera) to changes in quantity and quality of organic matter. Seismic surveys at the frequency of 12 kHz identified a large area with about 50% gas charged sediments in the study area.The main acoustic signatures of the shallow gas were black shadow and gas blanket. In addition, features related to gas seepages to the water column (acoustic plumes and pockmarks) and gas percolation within the sediments (intrasedimentary plumes, turbidity pinnacles) were also identified. The gas has a biogenic origin and results from the high acumulation rate between 0.03 to 0.9 cm.year -1 and from the decomposition of large amount of organic matter (10-20%). Vertical distribution of gas ranges from few centimeters to 9 m below the water-sediments interface. These occurrences are related to both gas migration from lower sedimentary layers to Holocene muds above, and to recent generation in near-surface sediments as the area display favorable conditions for gas production. Cores ranging from 150-240 cm in length have predominantly muddy sediments and variations in the P-wave velocity followed the changes in sediment density, controlled mainly by the presence of gas in sediments, bioclasts accumulation, textural variation and percentage of organic matter. Journal of Sedimentary Environments

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“…This sector integrates predominantly the Assemblage C which is composed typically by estuarine species (Laut et al, 2007(Laut et al, , 2014(Laut et al, , 2016a(Laut et al, , 2016bSouza et al, 2010, Clemente et al, 2014. The third sector (stations of Group IV) represents the outer part of the estuary with the strongest marine influence as pointed out by the Assemblage D. This assemblage is characterized by foraminiferal taxa characteristic of marine settings and the absence of thecamoebians (Todd & Brönnimann, 1957) transported from the Gulf of Paria to the estuary mouth by tidal currents.…”

Section: Benthic Foraminifera and Thecamoebians Of Godineau River Estmentioning

confidence: 99%

Benthic Foraminifera and Thecamoebians of Godineau River Estuary, Gulf of Paria, Trinidad Island

et al. 2017

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In the Godineau River Estuary, located in Trinidad Island (off the northeast coast of Venezuela), were found 114 taxa of foraminifera and 17 of thecamoebians in the dead fauna. Most of the identified foraminiferal species were rare because they were transported from the Gulf of Paria to this estuary. The autochthonous foraminiferal assemblage was represented by several tropical estuarine species such as Ammonia tepida, Ammotium salsum, Arenoparrella mexicana, Cribroelphidium excavatum, Ammonia parkinsoniana, Haplophragmoides wilberti, Miliammina fusca and Ammotium cassis. The thecamoebians assemblages, found in the inner part of this estuary, were dominated by Cyclopyxis spp., Centropyxis spp., Difflugia corona and Difflugia urceolata. The relative abundance of the main species of foraminifera and thecamoebians were analyzed through Q-mode and R-mode cluster analyses. Statistical results revealed the presence of three different environments in the Godineau River Estuary related to different hydrodynamic conditions and more or less oceanic or fluvial influence. The first sector represents the most confined region of the estuary and was mainly composed by agglutinated foraminifera together with thecamoebians. The second sector was located in the middle part of the estuary and was associated with the presence of brackish waters. The third sector denotes the outermost part of the estuary characterized by the greatest hydrodynamic activity and highest oceanic influence within the estuary. This sector was marked by the occurrence of a large number typical-marine foraminifera species. Keywords: Estuarine compartments; Foraminifera; thecamoebians; microtidal estuary; tropical coastal environment ResumoNo estuário do Godineau localizado na ilha de Trinidad (ao noroeste da costa de Venezuela) foram identificados 114 táxons de foraminíferos e 17 de tecamebas da fauna morta. Muitas das espécies de foraminíferos identificadas são raras e pequenas indicando transporte do Golfo de Paria para dentro do estuário. Os foraminíferos autóctones foram representados por espécies típicas de estuários tropicais como Ammonia tepida, Ammotium salsum, Arenoparrella mexicana, Cribroelphidium excavatum, Ammonia parkinsoniana, Haplophragmoides wilberti, Miliammina fusca e Ammotium cassis. As tecamebas eram abundantes na região mais interna do estuário. As espécies dominantes foram Cyclopyxis spp., Centropyxis spp., Difflugia corona e Difflugia urceolata. A abundância relativa das principais espécies foi analisada através da análise de agrupamento em modo Q e R. As análises estatísticas revelaram a existência de três ambientes distintos no estuário que são relacionados a diferentes condições hidrodinâmicas de maior ou menor influência marinha ou fluvial. O primeiro setor representou a região mais confinada do estuário composta por foraminíferos aglutinantes junto com tecamebas O segundo setor foi localizado na região intermediária do estuário e era tipicamente um ambiente salobro (mixohalino). O terceiro sector, situado na parte mais e...

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Multiproxies (Benthic Foraminifera, Ostracods and Biopolymers) Approach Applied to Identify the Environmental Partitioning of the Guadiana River Estuary (Iberian Peninsula)

Abstract: Multiproxies (benthic foraminifera, ostracods and biopolymers) approach applied to identify the environmental partitioning of the Guadiana River Estuary (Iberian Peninsula).

Cited by 20 publications

References 38 publications

Benthic foraminifera or Ostracoda? Comparing the accuracy of palaeoenvironmental indicators from a Pleistocene lagoon of the Romagna coastal plain (Italy)

Benthic foraminifera or Ostracoda? Comparing the accuracy of palaeoenvironmental indicators from a Pleistocene lagoon of the Romagna coastal plain (Italy)

High-Resolution Acoustic Mapping of Gas Charged Sediments and Living Benthic Foraminifera Assemblages From the Ne Region of the Guanabara Bay (Rj, Brazil)

Benthic Foraminifera and Thecamoebians of Godineau River Estuary, Gulf of Paria, Trinidad Island

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