Soils and landscapes of Marajó island, Brazilian Amazonia: Holocene evolution, geoarchaeology and climatic vulnerability

Henriques, Renata Jordan; Oliveira, Fábio Soares de; Schaefer, Carlos Ernesto Gonçalves Reynaud; Francelino, Márcio Rocha; Lopes, Paulo Roberto Canto; Senra, Eduardo Osório; Lourenço, Valéria Ramos

doi:10.1007/s12665-022-10310-2

Cited by 2 publications

(2 citation statements)

References 68 publications

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“…Mangrove/apicum soils exhibit a clay-silty to clay textural variation. The permanent or semipermanent water saturation leads to the accumulation of organic matter and the formation of horizons of black coloration (Henriques et al, 2022). When dry, the soils form a massive, lowdensity structure and the accumulation of salt, if present, increases the firmness/hardness of the soil structure Dystrophic yellow latosols are deep, nonhydromorphic soils, with A, latosolic B and C horizons.…”

Section: Regardingmentioning

confidence: 99%

Geo-environmental Analysis of Watersheds on the Eastern Coast of the State of Maranhão, Brazil and Interface with Lençóis Maranhenses National Park

Machado¹,

Silva

Soares

et al. 2023

Rev. Bras. Geog. Fis.

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Watersheds occupy a vulnerable position with regards to issues associated with anthropogenic changes. The state of Maranhão stands out in Brazil for its water resources. The Watersheds of the Eastern Coast of Maranhão (ECWSM) are located in the Hydrographic Region of the Western Atlantic. The present paper characterizes the physiography of the ECWSM of Maranhão, highlighting the components and natural potential (altimetry, declivity, soils, vegetation, water resources, geology and geomorphology), which were mapped using geotechnologies and secondary data. Thus, this paper provides information for the planning of socioeconomic development programs as well as land management plans. The geology, geomorphology, pedology and vegetation data were obtained from the IBGE database at a scale of 1:250,000. The Digital Elevation Model was obtained from the TOPODATA project. Water resources data were obtained from the IBGE, National Water Agency. The ECWSM analyzed were: the Hydrographic Basin System of the Rivers Itatuaba, Anajatuba, Axuí, Mapari, Periá, Grande and the Hydrographic Basins of the Negro and Preguiças Rivers. The morphological and physical attributes of the ECWSM and the relationships of ecological potential (geology, geomorphology, hydrology and climate), biological exploitation (soil and vegetation) and human actions reveal proxies of the evolution of the Holocene landscape. The natural resources and landscape of Conservation Units within these watersheds form immense nurseries for biological productivity that supports traditional economic activity. The mapping of the ECWSM contributes to the development of effective environmental zoning in the region.

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Section: Regardingmentioning

confidence: 99%

Geo-environmental Analysis of Watersheds on the Eastern Coast of the State of Maranhão, Brazil and Interface with Lençóis Maranhenses National Park

Machado¹,

Silva

Soares

et al. 2023

Rev. Bras. Geog. Fis.

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“…The changes observed here could be in combination with other factors that affect other mangrove systems in the region, for example, as a response to relative sealevel rise (Cohen et al, 2009;Cohen et al, 2018;Oyedotun and Johnson-Bhola, 2019), annual average temperature changes that affect the mangrove structure and productivity (Cohen and Lara, 2003), the observed tidal diurnal range and wave action and currents along the coast (Cohen et al, 2005), coastal topography (Castro et al, 2013) and the supply of sediments to the coastal depositional Frontiers in Environmental Science frontiersin.org system discussed here. It is, therefore, vital to identify the mangrove dynamics according to many changing variables along these coasts with geomorphological (Augustinus, 1995;Souza et al, 2022), metocean (meteorological and oceanography) particularities (Alfredini et al, 2013;Pezzoli et al, 2013;Reed et al, 2022), climatic dynamics (López-Angarita et al, 2016;Yao et al, 2022), vegetation and pedology changes (Alongi, 2015;Smith and Mayle, 2018;Henriques et al, 2022), mangrove diversity and the influence of mangrove pests, and various in-situ and adjoining anthropogenic activities (Alongi, 2002;Restrepo, 2012;López-Angarita et al, 2016;Thomas et al, 2017;Gorman, 2018;Servino et al, 2018;Pelage et al, 2019;Goldberg et al, 2020;Maina et al, 2021;Wilhelm et al, 2023), etc. as vital factors for consideration in understanding the different and annual dynamic responses presented by this unique ecosystem.…”

Section: Mangroves Dynamics At the River Mouthmentioning

confidence: 99%

River mouth morphodynamics and deflection over the short term: effects on spit growth and mangrove dynamics

Oyedotun

Nedd

2023

Front. Environ. Sci.

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The river mouth shows the influence of the dynamics of sediment deposition and the processes organising the deposits. The river mouths of the Guyana coast, as with other coastal systems in the Guianas, are influenced by the deposition of mud banks from the Amazon River and other rivers. This study analysed and probed the influence of the riverine and marine influences on small river mouth morphological developments. In this study, the morphological dynamics of the system were carried out from satellite images through the comparison of the inter-annual morphodynamics of the river mouths, complemented by data from hydrodynamic processes among others. This study demonstrates that the recent advancement and availability of Synthetic Aperture Radar (SAR), remotely sensed data, allow for the classification of migrating river mouth action and processes; effective monitoring of mudflats development and spit formation; and, the exhibition of river mouth transitioning and infilling. Sentinel-1 images of the Mahaica-Mahaicony river mouth in Guyana were processed and analysed using Google Earth Engine (GEE) and ArcGIS to observe the mud dynamics and its effects on deflecting the river mouth, influencing the development of spit and mangrove dynamics. The results of the analyses show that the dynamics of the mud shoal and river mouth are governed by feedback from various estuarine and hydrodynamic processes resulting from the interactions between the river and ocean. The results have not only highlighted the importance of mud infilling and sediment build-up for spit development and river-mouth deflection but the impact of the sediment morphological dynamics on the ecosystem (mangrove) associated with the river mouth.

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Soils and landscapes of Marajó island, Brazilian Amazonia: Holocene evolution, geoarchaeology and climatic vulnerability

Cited by 2 publications

References 68 publications

Geo-environmental Analysis of Watersheds on the Eastern Coast of the State of Maranhão, Brazil and Interface with Lençóis Maranhenses National Park

Geo-environmental Analysis of Watersheds on the Eastern Coast of the State of Maranhão, Brazil and Interface with Lençóis Maranhenses National Park

River mouth morphodynamics and deflection over the short term: effects on spit growth and mangrove dynamics

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