Climate, sea-level, and anthropogenic influences on coastal vegetation of the southern Bahia, Northeastern Brazil, during the mid-late Holocene

Geomorphology ◽  
2021 ◽  
pp. 107967
Author(s):  
Beatriz L. Figueiredo ◽  
Igor Charles C. Alves ◽  
Marcelo C.L. Cohen ◽  
Luiz C.R. Pessenda ◽  
Marlon Carlos França ◽  
...  
Keyword(s):  
Sea Level ◽  
Late Holocene ◽  
Northeastern Brazil ◽  
Coastal Vegetation ◽  
Anthropogenic Influences ◽  
Southern Bahia

scholarly journals The Impacts of the Middle Holocene High Sea-Level Stand and Climatic Changes on Mangroves of the Jucuruçu River, Southern Bahia – Northeastern Brazil

Radiocarbon ◽  
2017 ◽  
Vol 59 (1) ◽  
pp. 215-230 ◽  
Author(s):  
Neuza Araújo Fontes ◽  
Caio A. Moraes ◽  
Marcelo C L Cohen ◽  
Igor Charles C. Alves ◽  
Marlon Carlos França ◽  
...  
Keyword(s):  
Organic Matter ◽  
Sea Level ◽  
Sedimentary Organic Matter ◽  
Northeastern Brazil ◽  
C3 Plants ◽  
Terrestrial Organic Matter ◽  
Stable Isotopic ◽  
Southern Bahia ◽  
Mangrove Dynamics ◽  
A Site

AbstractThe aim of this paper is to evaluate the compatibility between the Holocene relative sea-level (RSL) curves proposed for the Brazilian littoral and mangrove dynamics along a fluvial valley in the state of southern Bahia. This was done integrating geomorphological, sedimentological, palynological, and stable isotopic data from two cores collected at the mouth of the Jucuruçu River and at a site 23 km inland, near the city of Prado, northeastern Brazil. Core PR07, sampled from a fluvial plain at about 4.5±1 m above the RSL, reveals mangrove pollen (5–20%) and estuarine/terrestrial organic matter (δ13C=~–25‰, C/N=7.3–67) between 4.5 m (~7400 cal yr BP) and 1.75 m depth (~5350 cal yr BP). Core PR11, sampled from a mangrove tidal flat, also revealed mangrove pollen taxa (5-28%) since 660 cal yr BP. Core PR07 indicated absence of mangrove pollen and increase of sedimentary organic matter sourced from terrestrial C3 plants (δ13C=~–27‰, C/N=22–159) during the last 5350 cal yr BP. Probably, the changes in vegetation and sedimentary organic matter identified in core PR07 were caused by the combined effects of the RSL fluctuations, with a highstand at about 5350 cal yr BP of 2.7±1.35 m, and changes in fluvial discharge.

The tadpole of Dendropsophus haddadi (Bastos & Pombal 1996) (Hylidae: Hylinae)

Zootaxa ◽  
2012 ◽  
Vol 3476 (1) ◽  
pp. 86 ◽  
Author(s):  
RICARDO LOURENÇO-DE-MORAES ◽  
FELIPE SIQUEIRA CAMPOS ◽  
LUÍS FELIPE TOLEDO
Keyword(s):  
Central America ◽  
Sea Level ◽  
Atlantic Forest ◽  
Coastal Areas ◽  
The State ◽  
Northeastern Brazil ◽  
Small Species ◽  
Southern Mexico ◽  
Southern Bahia ◽  
Espirito Santo

The genus Dendropsophus Fitzinger, 1843 currently includes 92 species of hylid treefrogs distributed from South and Central America to southern Mexico (Frost 2011). Dendropsophus haddadi is a small species of this genus (male SVL 15–19 mm; female SVL 21–24 mm) that is allocated in the D. decipiens clade, part of the D. microcephalus group, together with other three species: D. berthalutzae, D. decipiens, and D. oliveirai (Faivovich et al. 2005; Frost 2011). This species was recorded in regions of ombrophilous Atlantic forest and scrubby restinga vegetation mainly in coastal areas between the state of Espírito Santo and Pernambuco, Brazil (Bastos & Pombal 1996; Amorim et al. 2009; Camurugi et al. 2010; Araújo-Neto et al. 2012), ranging from sea level up to 650 m of elevation (Peixoto & Pimenta 2004). In this paper, we described the tadpole of D. haddadi from a population from southern Bahia, northeastern Brazil.

Late Holocene coastal dynamics and relative sea-level changes in the littoral of Paraíba, northeastern Brazil

2017 ◽  
Vol 41 (4) ◽  
pp. 375-392 ◽  
Author(s):  
Fabio Corrêa Alves ◽  
Dilce de Fátima Rossetti
Keyword(s):  
Sea Level ◽  
Late Holocene ◽  
Morphological Changes ◽  
Northeastern Brazil ◽  
Sea Level Changes ◽  
Array Type ◽  
Depositional Systems ◽  
Coastal Deposits ◽  
Shoreline Progradation

A preliminary analysis of a segment of the Paraíba littoral in northeastern Brazil revealed a prograding shoreline in a coast currently characterized by estuarine transgressive depositional systems. Detailed study of coastal geomorphology is of relevance to reconstruct the sea-level history in this shoreline. Such investigation can help improve the record of past sea-level curves of northeastern Brazil, an issue still open to debates. In this work, we explored remote sensing imagery for the geomorphological characterization of this prograding shoreline and combined this information with geological field data aiming to establish the various phases of shoreline progradation. In addition, we also analyzed the potential forcing factors responsible for the morphological changes in the eastern section of the littoral of Paraíba during the late Holocene, comparing changes with other prograding shorelines along the east coast of Brazil. Geomorphological interpretation was based on the analysis of Phased Array type L-band Synthetic Aperture Radar (PALSAR) images acquired aboard the Advanced Land Observing Satellite 1 (ALOS-1). Geological data comprised dating of sand samples by the optically stimulated luminescence (OSL) technique for the establishment of the chronological context. The coastal deposits are represented by a cuspate morphology and numerous internal beach ridges that prograded seaward from a roughly north–south trending palaeocliff. The chronological data indicate shoreline progradation during the past 2.1 ± 0.1 ka, after the mid-Holocene sea-level fall. Several prograding episodes occurred during this time, some not matching with proposed sea-level rises punctuated upon the overall fall. Together with the regional geological context of the study area, we propose that eustatic sea-level was not the only factor triggering coastal progradation in this region.

WHAT COMES NEXT? THE FINAL PUSH TO THE FUTURE LATE HOLOCENE SEA-LEVEL HIGHSTAND

2017 ◽  
Author(s):  
David J. Mallinson ◽  
◽  
Stephen J. Culver ◽  
Eduardo Leorri ◽  
Ryan Mulligan
Keyword(s):  
Sea Level ◽  
Late Holocene ◽  
The Future ◽  
Holocene Sea Level

Response of bay ostracod assemblages to Late Holocene sea-level, centennial-scale climate, and human-induced factors in northeast Beppu Bay, Japan

2021 ◽  
pp. 102002
Author(s):  
Toshiaki Irizuki ◽  
Jun Takahashi ◽  
Koji Seto ◽  
Hiroaki Ishiga ◽  
Yuki Fujihara ◽  
...  
Keyword(s):  
Sea Level ◽  
Late Holocene ◽  
Holocene Sea Level

BIOINDICATORS OF SEA-LEVEL FLUCTUATIONS IN SOUTHEASTERN BRAZIL: NEW DATA AND METHODOLOGICAL REVIEW

Radiocarbon ◽  
2021 ◽  
pp. 1-15
Author(s):  
Julia Caon Araujo ◽  
Kita Chaves Damasio Macario ◽  
Vinícius Nunes Moreira ◽  
Anderson dos Santos Passos ◽  
Perla Baptista de Jesus ◽  
...  
Keyword(s):  
Sea Level ◽  
Late Holocene ◽  
Data Interpretation ◽  
Progressive Increase ◽  
Southeastern Brazil ◽  
Recrystallization Process ◽  
Sea Level Changes ◽  
Sea Level Fluctuations ◽  
Data Gap ◽  
Current Zero

ABSTRACT The vermetidae fossils of Petaloconchus varians, formed by calcium carbonate, associated with their radiocarbon ages, are the most accurate indicators of paleo sea level due to their restricted occupation in the intertidal zone in the rocky shore. However, the recrystallization of minerals can affect these age calculations and, consequently, the interpretation of the data. The aim of this study is to present new indicators of paleo sea-level changes in Southeast Brazil for the last 6000 years contributing to fill the data gap for the late Holocene. The influence of the recrystallization process was successfully resolved using the CarDS protocol, enabling the separation of the original aragonite fraction by density, prior to radiocarbon dating. This avoids the rejuvenation of ages and ensures greater efficiency for data interpretation. Paleo sea-level indicators were able to show a progressive increase in sea level up to the transgressive maximum of 4.15 m in 3700 BP years, followed by a regression to the current zero. This regression seems to have in addition, here we reinforce the reliability of the use of fossil vermetids as indicators of sea-level fluctuations.

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