Análise faciológica e estratigráfica da planície costeira de Soure (margem leste da ilha de Marajó-PA), no trecho compreendido entre o canal do Cajuúna e o estuário Paracauari

França, Carmena Ferreira de; Souza-Filho, Pedro Walfir M.; El-Robrini, Maâmar

doi:10.1590/s0044-59672007000200013

Cited by 5 publications

(3 citation statements)

References 4 publications

(10 reference statements)

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“…The estuarine processes form several depositional environments: (i) tidal flats, (ii) sand flats, (iii) mangroves, (iv) tidal channel bars, (v) beaches and (vi) dunes, observed in the Amazonian coastal zone (Souza Filho & El-Robrini, 1996;França et al, 2007).…”

Section: P R O V a Smentioning

confidence: 99%

The use of diatoms for paleohydrological and paleoenvironmental reconstructions of Itupanema Beach, Pará State, Amazon Region, during the last millennium

Ribeiro¹,

Senna²,

Torgan³

2010

Rev. bras. paleontol.

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-Five sedimentary cores were collected on the ancient sedimentary clay deposits of Itupanema Beach, Barcarena town, Pará State, Amazon region, where diatom analysis was performed to infer the history of the paleoecological and paleohydrological changes during the last millennium. The results revealed 58 diatoms species among benthic and planktonic life forms. Correspondence analysis applied to relative abundance of diatoms and associated with sedimentary texture, OM contents and 14 C dating, defined three ecozones. The lower sandy ecozone 1 dated at 930 ± 40 14 C yr BP (Beta 217590) was dominated by the benthic/epipsammic species Staurosira obtusa, Staurosirella pinnata and Staurosirella crassa (nov. comb.), that indicated more hydrodynamic energy than in present days, originating a shallow sedimentary environment, under erosive conditions, unfavorable to the colonization of vegetation. The intermediate grey clay ecozone 2 that was observed only in the IT1 core, dated at 520 ± 40 14 C yr BP (Beta 217591) showed the prevalence of planktonic diatoms, providing evidence of a deeper and calmer environment, located in a probably protected area, with intense sedimentation of clay particles with abundant plant remains, colonized by mangrove forest and alluvial palm forest. The upper organic-clay to organic-sand ecozone 3 much younger than 520 ± 40 14 C yr BP, showed more agitated and erosive sedimentary conditions, however, with less energy than that in lower ecozones, indicated by higher abundance of A. granulata, strongly silicified. This new sedimentary environment allowed colonization by aquatic macrophyte vegetation which persists on the beach today.Key words: diatoms, taxonomy, tidal plain, estuaries, Amazon, Brazil.RESUMO -A análise de diatomáceas realizada em cinco testemunhos sedimentares obtidos de um antigo depósito sedimentar na praia de Itupanema, Barcarena, Estado do Pará, região amazônica, permitiu inferir a história das mudanças paleoecológicas e palaeohidrológicas durante o último milênio. Os resultados revelaram a presença de 58 espécies de diatomáceas, de hábitos bentônico e planctônico. A Análise de Correspondência foi aplicada aos dados de abundância relativa de diatomáceas e associada à textura sedimentar, teor de MO e datações 14 C, definindo três ecozonas. As ecozonas inferiores 1, datadas em 930 ± 40 14 C anos AP (Beta 217590), mostraram dominância de Staurosira obtusa, Staurosirella pinnata e Staurosirella crassa (comb. nov.), bentônicas/epipsâmicas, que indicaram maior energia hidrodinâmica que os dias atuais, em um ambiente sedimentar arenoso raso, erosivo, desfavorável para a colonização da vegetação. Na ecozona intermediária 2, com sedimentos argilo-orgânicos cinza e abundantes restos vegetais, observados somente em IT1, datados em 520 ± 40 14 C anos AP (Beta 217591), dominaram as diatomáceas planctônicas em um ambiente mais profundo e mais calmo, localizado em uma provável área protegida, colonizada por manguezal e floresta aluvial. As ecozonas superiores 3, argilo-orgânicas a ar...

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Section: P R O V a Smentioning

confidence: 99%

The use of diatoms for paleohydrological and paleoenvironmental reconstructions of Itupanema Beach, Pará State, Amazon Region, during the last millennium

Ribeiro¹,

Senna²,

Torgan³

2010

Rev. bras. paleontol.

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“…The Marajó Island is home to a mosaic of ecosystems formed by sandbanks, white-water ooded (várzea) forests, savannas, oodplains, and mangroves (Lisboa 2012). The mangroves of the Marajó Island are surrounded by a complex hydrological network of rivers, rich in ne suspended sediments with a high tidal range, added to high rainfall (França et al 2007). During the characterization of the natural and anthropic environments of the Marajó Island, Lisboa (2012) reported differences in the structure and oristic composition of three mangroves and explained them as resulting from the in uence of age, form of exploitation of resources, and the mouths of rivers.…”

Section: Introductionmentioning

confidence: 99%

Composition and community structure of mangroves distributed on the east coast of Marajó Island, Brazil

Faro

Gomes

Sarmento

et al. 2022

Wetlands Ecol Manage

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Mangroves in the Amazon are in uenced by several environmental conditions that determine the composition and structural development of the arboreal ora, which results in different distribution patterns. In this study, we sought to answer two questions: (1) what is the composition and structure of the mangroves near the mouth of the Amazon River in Marajó Island? (2) Are the fringe and inland mangroves more similar or dissimilar in terms of oristic composition? For this, we delimited a fringe zone and an inland zone about 1 km apart from each other. In each zone, we distributed ve 400-m 2 plots. The individuals were grouped into diameter and height classes and structural and phytosociological parameters were calculated. Ten species were recorded in the mangroves, of which seven are typical of white-water (várzea) and black-water (igapó) ooded forest ecosystems. We believed the adjacent ecosystems and the hydrological network are inducing the establishment of such species. The composition and structure of mangroves did not differ statistically between zones, and the degree of similarity may be a result of similar environmental factors in these zones such as low relief and high frequency of macrotides. We conclude that the vegetation of the studied mangroves has a major in uence of the uvial-marine system of the great rivers of the Amazon associated with a diversity of ecosystems that, together, generate greater oristic richness when compared to mangroves in other regions.

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“…Em áreas costeiras sob influência marinha ocorrem os manguezais, sendo estes associados com espécies de várzea. (França, 2006;França, et al, 2007). metoxicloro e mirex, com um total de 25 compostos (concentração de 1,0 ng µL -1 ).…”

Section: Vegetaçãounclassified

Histórico deposicional de Poluentes Orgânicos Persistentes em testemunhos sedimentares do ecossistema estuarino da Ilha do Marajó (Pará - Brasil)

Mello¹

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The spatial distribution and depositional history of persistent organic pollutants (POPs) in sediments were evaluated in marino-estuarine ecosystem of Marajó Island, Pará. The predominant pesticides in sediments of the surface layer were HCHs (<0.04 and 0, 90 ng g-1) and DDTS (<0.02 to 2.72 ng g-1) by dry weight. PCBs and PBDEs weren't detected. HCHs predominated in Paracauari Estuary indicating recent use probably related to logging. DDTs were detected in Praia do Pesqueiro and sediment cores (<0.02 to 12.31 ng g-1 dry weight) Mercado, Fazenda and Paracauari. Maximum levels of DDT residues occurred between 1982 and 2008 and are associated with pubic health campaigns. There is a gradual reduction up to the present which coincides with the substitution of the DDTs by pyrethroids. The ratio ΣDDDs / ΣDDEs predominantly < 1 indicated the occurrence of decomposicional processes under aerobic conditions. Overall, the environmental conditions do not favor the accumulation of pesticides in sediments, and the values are below the threshold likely to cause adverse effects except for HCHs in Paracauari Estuary. This work established the distribution of POPs in Marajó Island and could contribute to the process of coastal and environmental management in the region.

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Análise faciológica e estratigráfica da planície costeira de Soure (margem leste da ilha de Marajó-PA), no trecho compreendido entre o canal do Cajuúna e o estuário Paracauari

Cited by 5 publications

References 4 publications

The use of diatoms for paleohydrological and paleoenvironmental reconstructions of Itupanema Beach, Pará State, Amazon Region, during the last millennium

The use of diatoms for paleohydrological and paleoenvironmental reconstructions of Itupanema Beach, Pará State, Amazon Region, during the last millennium

Composition and community structure of mangroves distributed on the east coast of Marajó Island, Brazil

Histórico deposicional de Poluentes Orgânicos Persistentes em testemunhos sedimentares do ecossistema estuarino da Ilha do Marajó (Pará - Brasil)

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