Annual and Daily Changes of River Water Level at Breves and Caxiuan^|^atilde;, Amazon Estuary

Hida, Noboru; Maia, José Guilherme S.; Shimmi, Osamu; Hiraoka, Mário; Mizutani, Nobuaki

doi:10.4157/grj1984b.71.100

Cited by 6 publications

(6 citation statements)

References 4 publications

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“…Here, the river is about 40 m wide; during coring in June 1995, it was 5 m deep. Fluctuations between high and low water levels at the Caxiuanã station, as recorded by Hida et al (1997), average 33 cm (December 1995-April 1996. At this location, there is still a tidal influence; the range between low and high tides is approximately 17-21 cm.…”

Section: Study Areamentioning

confidence: 97%

Holocene Environmental Changes from the Rio Curuá Record in the Caxiuanã Region, Eastern Amazon Basin

Behling¹,

Costa²

2000

Quat. res.

137

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Holocene environments have been reconstructed by multiproxy studies of an 850-cm-long core from Rio Curuá dating to >8000 14C yr B.P. The low-energy river lies in the eastern Amazon rain forest in the Caxiuanã National Forest Reserve, 350 km west of Belem in northern Brazil. Sedimentological, mineralogical, and geochemical dates demonstrate that the deposits correspond to two different environments, sediments of an active river before 8000 14C yr B.P. and later a passive river system. The pollen analytical results indicate four different local and regional Holocene paleoenvironmental periods: (1) a transition to a passive fluvial system and a well-drained terra firme (unflooded upland) Amazon rain forest with very limited development of inundated forests (várzea and igapó) (>7990–7030 14C yr B.P.); (2) a sluggish river with a local Mauritia palm-swamp and similar regional vegetation, as before (7030–5970 14C yr B.P.); (3) a passive river, forming shallow lake conditions and with still-abundant terra firme forest in the study region (5970–2470 14C yr B.P.); and (4) a blocked river with high water levels and marked increase of inundated forests during the last 2470 14C yr B.P. Increased charcoal during this last period suggests the first strong presence of humans in this region. The Atlantic sea level rise was probably the major factor in paleoenvironmental changes, but high water stands might also be due to greater annual rainfall during the late Holocene.

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Section: Study Areamentioning

confidence: 97%

Holocene Environmental Changes from the Rio Curuá Record in the Caxiuanã Region, Eastern Amazon Basin

Behling¹,

Costa²

2000

Quat. res.

137

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“…The samples were taken in the lower Anapu River region at the Caxiuanã National Forest (1º 45' 27.5" S; 51º 27' 33.2" W), between the Xingu and Tocantins Rivers, in Eastern Amazonia, state of Pará, Brazil (Figure 1). The region is described as a lowland Amazon rainforest located at sea level, being influenced both by the tide and by the oscillation of Anapu River (Hida et al, 1999). However, both flows have very low intensity, with an annual fluctuation in the water level only about one meter (Hida et al, 1999) (retrieved from Freitas et al, 2011b, p. 632).…”

Section: Methodsmentioning

confidence: 99%

Influência do pulso de inundação nos aspectos ecológicos de um peixe iliófago da Amazônia Oriental, Brasil

2018

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O objetivo do estudo foi descrever aspectos ecológicos do peixe iliófago Cyphocharax abramoides, na Amazônia Oriental, Brasil, a respeito da variação da ingestão de matéria orgânica (OCC), do padrão de crescimento e do fator de condição (K). Os valores de OCC presentes nos conteúdos estomacais dos peixes foram obtidos a cada dois meses e avaliados pelo teste de Kruskal-Wallis. O padrão de crescimento foi obtido por meio da equação da relação peso-comprimento. A variação bimestral dos valores de K também foi avaliada pelo teste Kruskal-Wallis. Os resultados evidenciam diferenças nos valores de OCC ao longo do período estudado, com menores valores no período de seca e maiores valores na enchente. O padrão de crescimento foi alométrico positivo (b > 3). Os valores de K também variaram ao longo do estudo, o que sugere diferentes períodos de atividades fisiológicas. Os resultados também sugerem que as mudanças nesses parâmetros podem ser associadas às variações físicas no ambiente, em função do pulso de inundação. Esse estudo incrementa o nosso conhecimento sobre a relação entre espécies e ambiente, tornando-se relevante em uma região de alta biodiversidade e poucos estudos biológicos, como a Amazônia.

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“…Lowland floodplain forests (hereafter referred to as várzea) of the Amazon estuary have their own particular dynamic, characterised by twice daily tidal inundations seen up to Óbidos, 870 km inland [1]. These inundations carry sediments into the forest, enriching the soil [2], and as the tide falls, the water takes seeds and other biological material from the forest and disperses them throughout the estuary.…”

Section: Introductionmentioning

confidence: 99%

Artisanal Extraction and Traditional Knowledge Associated with Medicinal Use of Crabwood Oil (Carapa guianensis Aublet.) in a Peri‐Urban Várzea Environment in the Amazon Estuary

Nardi

Lira-Guedes²,

Cunha

et al. 2016

Evidence-Based Complementary and Alternative Medicine

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Várzea forests of the Amazon estuary contain species of importance to riverine communities. For example, the oil extracted from the seeds of crabwood trees is traditionally used to combat various illnesses and as such artisanal extraction processes have been maintained. The objectives of this study were to (1) describe the process involved in artisanal extraction of crabwood oil in the Fazendinha Protected Area, in the state of Amapá; (2) characterise the processes of knowledge transfer associated with the extraction and use of crabwood oil within a peri-urban riverine community; and (3) discern medicinal uses of the oil. The data were obtained using semistructured interviews with 13 community members involved in crabwood oil extraction and via direct observation. The process of oil extraction is divided into four stages: seed collection; cooking and resting of the seeds; shelling of the seeds and dough preparation; and oil collection. Oil extraction is carried out within the home for personal use, with surplus marketed within the community. More than 90% of the members of the community involved in extraction of crabwood oil highlighted the use of the oil to combat inflammation of the throat. Knowledge transfer occurs via oral transmission and through direct observation.

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Annual and Daily Changes of River Water Level at Breves and Caxiuan^|^atilde;, Amazon Estuary

Cited by 6 publications

References 4 publications

Holocene Environmental Changes from the Rio Curuá Record in the Caxiuanã Region, Eastern Amazon Basin

Holocene Environmental Changes from the Rio Curuá Record in the Caxiuanã Region, Eastern Amazon Basin

Influência do pulso de inundação nos aspectos ecológicos de um peixe iliófago da Amazônia Oriental, Brasil

Artisanal Extraction and Traditional Knowledge Associated with Medicinal Use of Crabwood Oil (Carapa guianensis Aublet.) in a Peri‐Urban Várzea Environment in the Amazon Estuary

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