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      Living and dead Foraminifera as bioindicators in Saquarema Lagoon System, Brazil

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          Abstract

          ABSTRACT: The understanding of the differences between living (L) and dead (D) benthic foraminiferal assemblages and all the factors that might lead their distribution should be a key to characterize the environmental and paleoenvironmental changes accurately. Population dynamics and dissimilarities of biological nature (the differences in turnover rate and seasonal alterations in standing stock) can cause significant divergences between the L and D foraminiferal assemblages. This study compares L and D foraminifera to evaluate the sediment quality of the Brazilian Saquarema Lagoon System (SLS) using biogeochemical proxies and predict how coastal ecosystems are responding to the combined effects of eutrophication and pollution pressure and areas where the paleoenvironmental studies can be performed. The SLS is a transitional environment where total organic carbon, proteins, and dissolved oxygen are the main factors controlling the distribution of foraminiferal assemblage. The high values of biopolymers (carbohydrates, lipids, and proteins) in SLS indicate a very impacted environment with long water residence time. The low values of species richness, Shannon-Weaver diversity, and evenness for both L and D foraminiferal assemblages are a consequence of fluctuating conditions in the SLS. Due to low salinities, agglutinated species and Quinqueloculina seminula can occur in the most confined areas, and Ammonia parkinsoniana, Cribroelphidium excavatum, Cribroelphidium poeyanum, and Elphidium gunteri characterized the area with the highest marine influence. Although in most of the SLS the taphonomic processes modified the original assemblage, in some regions the thanatocoenosis corresponds to the biocenosis. These areas can be considered the most suitable for future paleoenvironmental and paleoclimatic studies.

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          Confidence limits of species proportions in microfossil assemblages

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            A three-year time series of elemental and biochemical composition of organic matter in subtidal sandy sediments of the Ligurian Sea (northwestern Mediterranean)

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              The niche of benthic foraminifera, critical thresholds and proxies

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                Author and article information

                Contributors
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                Journal
                lajar
                Latin american journal of aquatic research
                Lat. Am. J. Aquat. Res.
                Pontificia Universidad Católica de Valparaíso. Facultad de Recursos Naturales. Escuela de Ciencias del Mar (Valparaíso, , Chile )
                0718-560X
                December 2018
                : 46
                : 5
                : 1055-1072
                Affiliations
                [3] Rio de Janeiro Rio de Janeiro orgnameUniversidade Federal do Estado do Rio de Janeiro orgdiv1Laboratório de Micropaleontologia Brazil
                [4] Rio de Janeiro Rio de Janeiro orgnameUniversidade Federal do Estado do Rio de Janeiro orgdiv1Departamento de Ciências Naturais Brazil
                [1] Rio de Janeiro Rio de Janeiro orgnameUniversidade Federal do Estado do Rio de Janeiro Brazil
                [6] Rio de Janeiro Rio de Janeiro orgnamePontifícia Universidade Católica do Rio de Janeiro orgdiv1Departamento de Geografia e Meio Ambiente Brazil
                [2] Rio de Janeiro Rio de Janeiro orgnameUniversidade do Estado do Rio de Janeiro orgdiv1Departamento de Estratigrafia e Paleontologia Brazil
                [5] Urbino orgnameUniversità degli Studi di Urbino "Carlo Bo" orgdiv1Dipartimento di Scienze Pure e Applicate Italy
                Article
                S0718-560X2018000501055
                10.3856/vol46-issue5-fulltext-18
                f46bfde2-b92e-4bd1-9f55-5440a87e995d

                This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

                History
                : 26 October 2017
                : 13 July 2018
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 71, Pages: 18
                Product

                SciELO Chile

                Categories
                Research Articles

                environmental quality,trophic state,marine pollution,coastal lagoon,neontology,foraminifera

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