scholarly journals Deforestation monitoring in the Amazon River estuary by multi-temporal Envisat ScanSAR data

2016 ◽  
Vol 34 ◽  
pp. 012003
Author(s):  
F Chen ◽  
N Ishwaran ◽  
J C Brito Pezzuti
Keyword(s):  
River Estuary ◽  
Amazon River ◽  
Multi Temporal

scholarly journals Distribution and flux of226Ra and228Ra in the Amazon River estuary

1985 ◽  
Vol 90 (C4) ◽  
pp. 6995 ◽  
Author(s):  
R. M. Key ◽  
R. F. Stallard ◽  
W. S. Moore ◽  
J. L. Sarmiento
Keyword(s):  
River Estuary ◽  
Amazon River

Modeling Spatio-Temporal Shoreline Shifting of a Coastal Island in Bangladesh Using Geospatial Techniques and DSAS Extension

2018 ◽  
Vol 18 (1) ◽  
pp. 1-13 ◽  
Author(s):  
Md. Salauddin ◽  
Khandaker Tanvir Hossain ◽  
Istiaqe Ahmed Tanim ◽  
Md. Anisul Kabir ◽  
Mehedi Hasan Saddam
Keyword(s):  
Satellite Images ◽  
River Estuary ◽  
Northwestern Part ◽  
Southwestern Part ◽  
Geospatial Techniques ◽  
End Point ◽  
Time Period ◽  
Multi Temporal ◽  
Spatio Temporal ◽  
End Point Rate

Abstract The study attempted to assess the changes in shoreline and erosion-accretion of newly formed island at the mouth of the Meghna river estuary in Bangladesh using multi temporal satellite images and GIS techniques. The current study used NDWI an MNDWI to delineate land and water boundary to extract the shoreline and also used some overlay analysis to measure the erosion-accretion. DSAS extension is used for analyzing the shifting of the shoreline. The results (1990-2015) show that the island has 1192 hectares of land accreted during this time period, and about 1 km of its shoreline lost during this time period as it has broken in few places. Most accretion found in the northwestern part and erosion in southeastern and southwestern part. The study area was divided into four different segments and about 115 transects were constructed, of which about 74 shows the seaward movement and 44 shows landward movement. Seaward movement and rate of shoreline shifting is higher in the northwestern part where net shoreline movement (NSM) is +1897 meters and end point rate (EPR) is +73 m/year. Landward movement and the rate of shoreline shifting are higher in southeastern and southwestern part of which net shoreline movement (NSM) is about -2680 meters and end point rate (EPR) is about -129 m/year. The highest landward movement is found as -2680 meters and highest seaward movement as +1897 meters. Accretion process is dominant while erosion process discontinued the shoreline in some places.

scholarly journals First evidence of microplastic ingestion by fishes from the Amazon River estuary

2018 ◽  
Vol 133 ◽  
pp. 814-821 ◽  
Author(s):  
Tamyris de Souza e Silva Pegado ◽  
Kurt Schmid ◽  
Kirk O. Winemiller ◽  
David Chelazzi ◽  
Alessandra Cincinelli ◽  
...  
Keyword(s):  
River Estuary ◽  
Amazon River

scholarly journals Natural diet and feeding habits of a freshwater prawn (Macrobrachium carcinus: Crustacea, Decapoda) in the estuary of the Amazon River

2014 ◽  
Vol 44 (2) ◽  
pp. 235-244 ◽  
Author(s):  
Jô de Farias Lima ◽  
Jamile da Silva Garcia ◽  
Thibério Carvalho da Silva
Keyword(s):  
Feeding Habits ◽  
River Estuary ◽  
Stomach Contents ◽  
Freshwater Prawn ◽  
Amazon River ◽  
Feeding Preferences ◽  
Important Food ◽  
Natural Diet ◽  
Food Items ◽  
Stomach Analysis

Macrobrachium carcinus is a Brazilian native prawn with recognized potential for use in aquaculture activities. However, there is little information about the natural diet and feeding habits of this species. The aim of this study was the identification of the diet items of M. carcinus based on the analysis of the stomach contents. Specimens were collected in the Amazon River estuary between January 2009 and January 2010. The stomach analysis was carried out by using the frequency of occurrence (FO), methods of points (MP) and feeding index (FI). It was observed that prawns fed on detritus, animals and plant fragments as the most important food items. Sediment accounted for the main stomach content, accounting for 43.2% by the MP, 44.9% by FI and 100% by the FO. Sexual differences in feeding preferences were not found in this study, and seasonal differences in the frequency of items ingested by M. carcinus were not observed. The results indicated that M. carcinus can be considered omnivorous species, but with an important carnivorous component, similar to that found in other Macrobrachium species.

Dissolved concentrations and organic speciation of copper in the Amazon River estuary and mixing plume

2021 ◽  
pp. 104005
Author(s):  
Adrienne Patricia Hollister ◽  
Hannah Whitby ◽  
Michael Seidel ◽  
Pablo Lodeiro ◽  
Martha Gledhill ◽  
...  
Keyword(s):  
River Estuary ◽  
Amazon River ◽  
Organic Speciation

Phenological behavior and floral visitors of Pentaclethra macroloba, a hyperdominant tree in the Brazilian Amazon River estuary

Trees ◽  
2021 ◽  
Author(s):  
Adelson Rocha Dantas ◽  
Marcelino Carneiro Guedes ◽  
Ana Cláudia Lira-Guedes ◽  
Maria Teresa Fernandez Piedade
Keyword(s):  
River Estuary ◽  
Brazilian Amazon ◽  
Amazon River ◽  
Pentaclethra Macroloba ◽  
Floral Visitors

scholarly journals Report of Macraspis pseudochrysis Landin, 1956 (Coleoptera: Scarabaeidae: Rutelinae) on açai palms (Euterpe oleracea Mart.) in floodplains in the state of Amapá, Brazil

2013 ◽  
Vol 13 (1) ◽  
pp. 380-382 ◽  
Author(s):  
Cristiane Ramos de Jesus-Barros ◽  
Lidiane Silva Freitas ◽  
Paschoal Coelho Grossi
Keyword(s):  
River Estuary ◽  
The State ◽  
Amazon River ◽  
Euterpe Oleracea ◽  
Brazilian State ◽  
First Occurrence ◽  
The City ◽  
East Amazon ◽  
Euterpe Oleracea Mart

The açaí palm (Euterpe oleracea) is an East Amazon palm found most frequently in the Amazon River estuary. Riverside dwellers in different regions of the state of Amapá have recently been observing a species of coleopteran attacking the inflorescences of açai palms. With a view to identifying a species of coleopteran attacking inflorescences of E. oleracea in the Brazilian state of Amapá, insects were collected in the regions of Abacate da Pedreira (two individuals) and Ariri (six) in the city of Macapá. Five individuals were also collected in Mazagão. The insects were collected from açai palm inflorescences using entomological nets, then preserved and submitted for identification. They were identified as Macraspis pseudochrysis Landin, 1956 (Coleoptera: Scarabaeidae: Rutelinae). This is the first occurrence of M. pseudochrysis in E. oleracea in the Neotropics.

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