Do fish isotopic niches change in an Amazon floodplain lake over the hydrological regime?

2021 ◽  
Author(s):  
Lucas Silva Azevedo ◽  
Inácio Abreu Pestana ◽  
Marcelo Gomes Almeida ◽  
Wanderley Rodrigues Bastos ◽  
Cristina Maria Magalhães Souza
Keyword(s):  
Hydrological Regime ◽  
Floodplain Lake ◽  
Amazon Floodplain

scholarly journals 240+239Pu depositional signatures as a viable geochronological tool in the Amazon Basin

2017 ◽  
Vol 44 (1) ◽  
pp. 142-149 ◽  
Author(s):  
Luciana M Sanders ◽  
Kathryn H Taffs ◽  
Debra Stokes ◽  
Alex Enrich-Prast ◽  
Christian J Sanders
Keyword(s):  
Amazon Basin ◽  
Environmental Science ◽  
Sediment Cores ◽  
Sediment Accumulation ◽  
Recent Sediment ◽  
Floodplain Lake ◽  
Accumulation Rates ◽  
Amazon Floodplain ◽  
Dating Methods ◽  
Lead 210

AbstractAnthropogenic radionuclide signatures associated with nuclear testing are increasingly utilized in environmental science to explore recent sedimentation. In this study, we assess the suitability of Pu radioisotope analysis in floodplain lake environments in the Amazon Basin to form geochronologies during the 20thcentury. The240Pu +239Pu (240+239Pu) signatures in six sediment cores indicate sediment accumulation rates in the floodplain lakes of the major rivers; Amazon (2.3 mm year-1), Tapajos (10.2 and 2.4 mm year-1) and Madeira (3.4, 4.2 and 6.2 mm year-1). The results from this study show that240+239Pu fallout activities, and the well documented (240Pu/239Pu) atomic ratios of the above ground nuclear tests which began in the 1950’s, are sufficient and well preserved in Amazon floodplain lake sediments to infer chronologies. Lead-210 dating analyses in the same sediment cores produced comparable sediment accumulation rates at three of the six sites. The differences between dating methods may be attributed to the different time scale these dating methods represent and/or in the solubility between Pb and Pu along the sediment column. The geochronologies derived from the240+239Pu and210Pb dating methods outlined in this work are of interest to identify the effects of changing sediment accumulation rates during the previous century as a result of development, including deforestation, along the Amazon Basin which increased towards the middle of the 20thcentury. This study shows that Pu dating provides a viable alternative geochronology tool for recent sediment accumulation (previous ~60 years) along the Amazon Basin.

Climate and hydrologic controls on late Holocene sediment supply to an Amazon floodplain lake

2020 ◽  
Vol 64 (4) ◽  
pp. 389-403
Author(s):  
Luciane Silva Moreira ◽  
Patricia Moreira-Turcq ◽  
Renato Campello Cordeiro ◽  
Bruno Turcq ◽  
Keila Cristina Aniceto ◽  
...  
Keyword(s):  
Late Holocene ◽  
Sediment Supply ◽  
Floodplain Lake ◽  
Amazon Floodplain ◽  
Holocene Sediment ◽  
Hydrologic Controls

scholarly journals Seasonal and Interannual Patterns and Controls of Hydrological Fluxes in an Amazon Floodplain Lake With a Surface‐Subsurface Process Model

2019 ◽  
Vol 55 (4) ◽  
pp. 3056-3075 ◽  
Author(s):  
Xinye Ji ◽  
Lance F. W. Lesack ◽  
John M. Melack ◽  
Shilong Wang ◽  
William J. Riley ◽  
...  
Keyword(s):  
Process Model ◽  
Floodplain Lake ◽  
Amazon Floodplain ◽  
Hydrological Fluxes

Temporal fluctuations of the phytoplankton community in an isolated floodplain lake (North Mollaköy Lake) of the Sakarya River (Northern Turkey)

2014 ◽  
Vol 43 (4) ◽  
Author(s):  
Tuğba Sevindik ◽  
Hatice Tunca ◽  
Burçin Önem ◽  
Sevil Tamer
Keyword(s):  
Functional Groups ◽  
Phytoplankton Biomass ◽  
Water Discharge ◽  
Temporal Distribution ◽  
Hydrological Regime ◽  
Environmental Parameters ◽  
Spatial And Temporal Variation ◽  
Floodplain Lake ◽  
Sakarya River ◽  
T1 And T2

AbstractThe aim of this study was to determine the spatial and temporal variation of phytoplankton and water quality in response to the hydrological regime in an isolated floodplain lake (North Mollaköy Lake) of the Sakarya River. Variations in the composition, biomass and functional groups of phytoplankton and environmental parameters were monthly analyzed in sub-surface samples collected from the pelagic zone at four stations from July 2012 to June 2013. A total of 109 taxa were identified, and the species which contributed the most to the phytoplankton biomass were grouped into 14 functional groups (FGs). The distribution of FGs was linked to the transition (T1 and T2), high (HW) and low (LW) water periods in North Mollaköy Lake. FGs J, MP, N, G, X1, X2, Y, W1, W2, S1, H1, B and C were the contributors to the phytoplankton biomass during the low-water period (LW) and the transition periods (T1 and T2), while Lo contributed the most during the high-water period (HW). RDA revealed that the most important factor affecting the temporal distribution of FGs was the water discharge and that there are some differences between stations in terms of Si, pH values and the distribution of FGs.

scholarly journals Seepage exchange in an Amazon floodplain lake

1995 ◽  
Vol 40 (3) ◽  
pp. 598-609 ◽  
Author(s):  
Lance F. W. Lesack
Keyword(s):  
Floodplain Lake ◽  
Amazon Floodplain

scholarly journals Mercury biomagnification in an ichthyic food chain of an amazon floodplain lake (Puruzinho Lake): Influence of seasonality and food chain modeling

2021 ◽  
Vol 207 ◽  
pp. 111249 ◽  
Author(s):  
Lucas Silva Azevedo ◽  
Inácio Abreu Pestana ◽  
Marcelo Gomes Almeida ◽  
Adriely Ferreira da Costa Nery ◽  
Wanderley Rodrigues Bastos ◽  
...  
Keyword(s):  
Food Chain ◽  
Floodplain Lake ◽  
Amazon Floodplain
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