Paleoenvironmental insights into the Quaternary evolution of the southern Brazilian coast based on fossil and modern diatom assemblages

Santos-Fischer, Cristiane Bahi dos; Corrêa, Iran Carlos Stalliviere; Weschenfelder, Jair; Torgan, Lezilda Carvalho; Stone, Jeffery R.

doi:10.1016/j.palaeo.2016.01.018

Cited by 27 publications

(32 citation statements)

References 107 publications

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“…It is considered a cosmopolitan species, especially common in tidal flats (Witkowski et al 2000). The species was registered in Patos Lagoon core sediment samples (Santos-Fischer et al 2016) and in the coastline along the States of Paraná and Santa Catarina (Araújo et al 1989;Fernandes et al 1990, Felício-Fernandes 1996, Souza-Mosimann 1988, Souza-Mosimann & Roos-Oliveira 1998, Souza-Mosimann & Laudares-Silva 2005, Procopiak et al 2006, Souza-Mosimann et al 2011.…”

Section: Discussionmentioning

confidence: 99%

“…The species is considered estuarine (Cleve & Grunow 1880). It has been recorded to coastal environments in southern Brazil (Fernandes et al 1990, Felício-Fernandes 1996, Procopiak et al 2006, in Patos Lagoon salt marsh by Silva et al (2010) and in core sediment samples from different geologic formations in the State of Rio Grande do Sul (Abreu et al 1987, Santos-Fischer et al 2016.…”

Section: Discussionmentioning

confidence: 99%

“…The species has been originally found in freshwaters (Grunow 1862) but is also spread in marine and brackish waters (Hartley 1996, Biota Neotrop., 20(1): e20190774, 2020 http://www.scielo.br/bn http://dx.doi.org/10.1590/1676-0611-BN-2019-0774 Witkoswki et al 2000). In southern Brazil it is widely recorded in continental and coastal waters (Souza-Mosimann 1982, Felício-Fernandes 1996, Souza-Mosimann & Roos-Oliveira 1998, Torgan et al 1999, Souza-Mosimann & Laudares-Silva 2005, Procopiak et al 2006, Tremarin et al 2009, Bes & Torgan 2008, Bes et al 2012, in Patos Lagoon salt marsh by Silva et al (2010) and in in core sediment samples from different geologic formations in the State of Rio Grande do Sul (Hermany et al 2013, Santos-Fischer et al 2016.…”

Section: Discussionmentioning

confidence: 99%

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The genus Tryblionella W. Smith (Bacillariaceae, Bacillariophyta) in southern Brazil salt marshes

et al. 2020

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Tryblionella is a large epipelic genus, widespread from fresh to marine waters. Most of the studies including the genus are based only in light microscopy. Few recent studies are exclusively dedicated to Tryblionella and the ultrastructure of some species is still little known. In this paper we present eleven species of Tryblionella found in epiphyton and microphytobenthos in Patos Lagoon salt marshes. All the species are described, illustrated in light and scanning electron microscopy and comments about their taxonomy, distribution and ecology are provided. Two taxa are reported for the first time in the State of Rio Grande do Sul and one in Southern Brazil. The number of species registered in this study comprises nearly a half of the number of species registered in the country. The high richness observed may be related to the dynamics of the salt marshes, which provides both the mixing of fresh and marine waters communities and the diversity of microhabitats. The great variability among the species analyzed allowed to extend the general concept of Tryblionella, adding features which were not considered in the previous characterizations of the genus.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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The genus Tryblionella W. Smith (Bacillariaceae, Bacillariophyta) in southern Brazil salt marshes

et al. 2020

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“…Previous studies suggest the breaching of the Pleistocene Barrier III (Toldo Jr. et al 1991, Barboza et al 2005, Weschenfelder et al 2008b, Santos-Fischer et al 2016. The pioneer study relating a feature named Barra Falsa in the eastern Patos Lagoon margin to a Holocene inlet was carried out by Toldo Jr. et al (1991).…”

Section: Regional Settingmentioning

confidence: 95%

“…The pioneer study relating a feature named Barra Falsa in the eastern Patos Lagoon margin to a Holocene inlet was carried out by Toldo Jr. et al (1991). Following, few studies based on seismic stratigraphic, palynomorph and diatom analysis also corroborated this interpretation (Weschenfelder et al 2008b, Santos-Fischer et al 2016, Bortolin 2017. Besides Barra Falsa, other features in the Patos Lagoon eastern margin, such as Rincão Lake, Reserva Lake and Gateados Lake (Fig.1), also could be indicative of Holocene inlets (Bortolin 2017;Bortolin et al 2018).…”

Section: Regional Settingmentioning

confidence: 99%

Incised valley paleoenvironments interpreted by seismic stratigraphic approach in Patos Lagoon, Southern Brazil

2018

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The Rio Grande do Sul (RS) coastal plain area (33,000 km 2) had its physiography modified several times through the Quaternary, responding to allogenic and autogenic forcings. The Patos Lagoon covers a significant area of RS coastal plain (10,000 km 2), where incised valleys were identified in previous works. About 1,000 km of high resolution (3.5 kHz) seismic profiles, radiocarbon datings, Standard Penetration Test (SPT) and gravity cores were analyzed to interpret the paleoenvironmental evolution as preserved in incised valley infills. Seismic facies were recognized by seismic parameters. The sediment cores were used to ground-truth the seismic interpretations and help in the paleoenvironmental identification. Key surfaces were established to detail the stratigraphical framework, and seismic facies were grouped into four seismic units, which one classified in respective system tracts within three depositional sequences. The oldest preserved deposits are predominantly fluvial and estuarine facies, representing the falling stage and lowstand system tracts. The Holocene transgressive records are dominated by muddy material, mainly represented by estuarine facies with local variations. The transgression culminated in Late Holocene deposits of Patos Lagoon, representing the highstand system tract. The depositional pattern of the vertical succession was controlled by eustatic variations, while the autogenic forcing (paleogeography and sediment supply) modulated the local facies variation.

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Effects of the middle Holocene high sea‐level stand and climate on Amazonian mangroves

Cohen

Camargo

Pessenda

et al. 2021

J Quaternary Science

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The high sea-level stand during the mid-Holocene is a benchmark in mangrove dynamics along the north-east/south-east coast of Brazil and provides a reference point for landward and seaward mangrove migrations corresponding to changes in relative sea level (RSL). However, evidence of the impacts associated with RSL fall on the northern Brazilian coast is scarce. Multi-proxy data from the highest tidal flats of the Bragança Peninsula in northern Brazil revealed modern herbaceous areas were occupied by mangroves Rhizophora and Avicennia from 6250 to~5850 cal a BP, and only Avicennia between~5850 and~5000 cal a BP. The same tidal flats were vegetation-free between~5000 and~4300 cal a BP. A combination of a high sea-level stand (0.6 ± 0.1 m) at 5000 cal a BP and a dry early-middle Holocene in the Amazon probably caused an increase in porewater salinity of tidal flats, which resulted in a mangrove succession from Rhizophora to Avicennia dominance. RSL fall accentuated this process, contributing to mangrove degradation between~5000 and~4300 cal a BP. RSL fall, and a wetter period over the past~4300 cal a BP caused a mangrove migration from highest to lowest flats, followed by expansion of herbaceous vegetation on the highest flats.

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Paleoenvironmental insights into the Quaternary evolution of the southern Brazilian coast based on fossil and modern diatom assemblages

Cited by 27 publications

References 107 publications

The genus Tryblionella W. Smith (Bacillariaceae, Bacillariophyta) in southern Brazil salt marshes

The genus Tryblionella W. Smith (Bacillariaceae, Bacillariophyta) in southern Brazil salt marshes

Incised valley paleoenvironments interpreted by seismic stratigraphic approach in Patos Lagoon, Southern Brazil

Effects of the middle Holocene high sea‐level stand and climate on Amazonian mangroves

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