Effects of water level, abiotic and biotic factors on bacterioplankton abundance in lagoons of a tropical floodplain (Paraná River, Brazil)

Hydrobiologia ◽  
2003 ◽  
Vol 510 (1-3) ◽  
pp. 67-74 ◽  
Author(s):  
P. Carvalho ◽  
S.M. Thomaz ◽  
L.M. Bini
Keyword(s):  
Water Level ◽  
Paraná River ◽  
Biotic Factors ◽  
Parana River ◽  
Tropical Floodplain ◽  
Abiotic And Biotic Factors ◽  
Bacterioplankton Abundance

Habitat-mediated influence of water-level fluctuations on waterbird occurrence in floodplain wetlands of the Parana River, Argentina

2017 ◽  
Vol 33 (9) ◽  
pp. 1494-1505 ◽  
Author(s):  
R.E. Lorenzón ◽  
A.H. Beltzer ◽  
P.M. Peltzer ◽  
P.F. Olguin ◽  
E.J. León ◽  
...  
Keyword(s):  
Water Level ◽  
Paraná River ◽  
Water Level Fluctuations ◽  
Floodplain Wetlands ◽  
Parana River ◽  
Influence Of Water

scholarly journals GÊNESE DE BARRAS DE SOLDAMENTO E SUAS CARACTERÍSTICAS MORFOLÓGICAS: ALTO RIO PARANÁ, BRASIL / Attachment Bars Genesis and Morphological Features: Upper Paraná River, Brazil

2016 ◽  
Vol 2 (1) ◽  
pp. 127
Author(s):  
Vanessa Cristina Dos Santos ◽  
José Cândido Stevaux
Keyword(s):  
Water Level ◽  
Energy Flow ◽  
High Water ◽  
Morphological Characterization ◽  
Paraná River ◽  
Secondary Channel ◽  
Parana River ◽  
Average Water ◽  
Upper Paraná River

O rio Paraná, em seu trecho natural, é caracterizado por canais secundários de diferentes ordens de tamanho, separando diversas ilhas e barras fluviais. As barras fluviais apresentam grande porte e suas formas mudam constantemente conforme a magnitude do fluxo. Este estudo apresenta a caracterização morfológica de uma barra de soldamento e suas adjacências, situadas junto à ilha Santa Rosa, no alto rio Paraná. Para tanto, a morfologia da barra foi comparada em dois momentos hidrológicos distintos através de levantamentos com aparelho de batimetria. Os resultados evidenciam que a morfologia da barra estudada está diretamente influenciada pelas oscilações da vazão do rio Paraná. No período de águas altas há maior retrabalhamento da forma, e preservação parcial em período de águas médias. A análise da distribuição das formas adjacentes à barra de soldamento permitiu constatar que o canal principal possui mais energia, já que apresenta formas íngremes e profundas, e o canal secundário indica menor energia de fluxo por apresentar formas mais suaves.AbstractThe Paraná River, in its natural reach is characterized by secondary channels of different size orders, which separates several islands and bars. Fluvial bars are large and their forms change constantly due to the flow. This study presents the morphological characterization of an attachment bar and its adjacencies, located nearby the island Santa Rosa, in the upper Paraná River. Therefore, the morphology of the bar was compared in two distinct hydrological moments through surveys with bathymetry equipment. The results indication that the morphology of the studied bar is directly influenced by fluctuations in the flow of the Paraná River. In the period of high water level there is more reworking of the forms and partial preservation in average water level. The analysis of the distribution of forms adjacent to the attachment bar allowed establishing that the main channel is more energetic, as it presents abrupt and deep forms and the secondary channel indicates lower energy flow by presenting smoother forms.Keywords:Paraná River, Fluvial Geomorphology, Morphology, Attachment Bar

scholarly journals Estimating flooded area and mean water level using active and passive microwaves: the example of Paraná River Delta floodplain

2011 ◽  
Vol 15 (8) ◽  
pp. 2679-2692 ◽  
Author(s):  
M. Salvia ◽  
F. Grings ◽  
P. Ferrazzoli ◽  
V. Barraza ◽  
V. Douna ◽  
...  
Keyword(s):  
Water Level ◽  
Paraná River ◽  
River Delta ◽  
Envisat Asar ◽  
Parana River ◽  
River Floodplains ◽  
Passive Data ◽  
Mean Water Level ◽  
Flooded Area ◽  
Microwave Signatures

Abstract. This paper describes a procedure to estimate both the fraction of flooded area and the mean water level in vegetated river floodplains by using a synergy of active and passive microwave signatures. In particular, C band Envisat ASAR in Wide Swath mode and AMSR-E at X, Ku and Ka band, are used. The method, which is an extension of previously developed algorithms based on passive data, exploits also model simulations of vegetation emissivity. The procedure is applied to a long flood event which occurred in the Paraná River Delta from December 2009 to April 2010. Obtained results are consistent with in situ measurements of river water level.

‘La Niña’ phenomenon and the relationship between decapod populations and fishes in temporarily isolated shallow lakes

2017 ◽  
Vol 68 (6) ◽  
pp. 1010 ◽  
Author(s):  
María Victoria Torres ◽  
Federico Giri ◽  
Pablo Agustín Collins
Keyword(s):  
Shallow Lakes ◽  
Paraná River ◽  
La Niña ◽  
Additional Stress ◽  
Complete Disappearance ◽  
Parana River ◽  
La Nina ◽  
Local Species ◽  
Abiotic And Biotic Factors ◽  
The Relationship

The ‘La Niña’ phenomenon causes temporary isolation of shallow lakes in rivers with floodplain. Furthermore, as abiotic conditions become more extreme, and intra–interspecific relationships intensify, the risk of local species extinction increases. The Paraná River in South America is a river with an extensive floodplain with many shallow lakes. In these environments, freshwater prawns and many fish species coexist. The aim of the work was to study the interaction between two species of prawns (Palaemonetes argentinus and Macrobrachium borellii) and fishes during ‘La Niña’ phenomenon. Density variations of prawns and fishes were examined in three shallow lakes at Paraná River. The samples were collected monthly at several points of each aquatic environment with a trawl net. Abiotic and biotic factors were measured. Density and population structure varied in both prawns, and fishes, and the changes have not been simultaneous. These variations might be associated with predation, aggressive behaviour of the prawns and internal micro-migrations. The effect of La Niña creates additional stress on prawn populations when water inflow is delayed. This fact could promote the decrease or the complete disappearance of one or both prawn species in the environments, and modify the trophic web in the next phase of the shallow lakes.

scholarly journals Effects of flooding regime on the feeding activity and body condition of piscivorous fish in the Upper Paraná River floodplain

2009 ◽  
Vol 69 (2 suppl) ◽  
pp. 481-490 ◽  
Author(s):  
KDG. Luz-Agostinho ◽  
AA. Agostinho ◽  
LC. Gomes ◽  
HF. Júlio-Jr. ◽  
R. Fugi
Keyword(s):  
Water Level ◽  
Body Condition ◽  
Feeding Activity ◽  
Flood Pulse ◽  
Paraná River ◽  
Water Levels ◽  
Water Level Fluctuations ◽  
Piscivorous Fish ◽  
Flooding Regime ◽  
Parana River

Flood pulses affect floodplain enrichment via the incorporation of nutrients and terrestrial biomass. As a result, they positively affect the body condition of aquatic organisms. This paper evaluates whether the absence of floods (resulting from dam control) affects the feeding activity and body condition of piscivorous fish. In addition, whether piscivores respond similarly to alterations in the flooding regime was assessed. Five piscivorous species were selected (Acestrorhynchus lacustris, Hoplias aff. malabaricus, Plagioscion squamosissimus, Rhaphiodon vulpinus, and Salminus brasiliensis). The fish were captured in four distinct years and in three river subsystems with differentiated water level fluctuations (Ivinheira = not regulated; Baía = regulated by the Paraná River level; Paraná = regulated by dams). Feeding activity and body condition were evaluated using the mean values of the standard residuals generated by regression models between body and stomach weights and standard length and body weight (all log-transformed). Differences among years and subsystems were evaluated via two-way analysis of variance. Pearson and Spearman correlations were performed between flooding attributes (duration, amplitude, timing, and daily variability) and feeding activity and body condition. Feeding activity differed across subsystems, whereas body condition varied across years, depending on the subsystem. Hoplias aff malabaricus (an ambusher adapted to starvation) presented feeding activity independent of the flooding regime and also presented better body condition in times of high water levels. Rhaphidon vulpinus exhibited variations in feeding activity but did not present alterations in body condition. The other species presented poorer body condition in years or subsystems with regular floods. Correlations identified that the duration and timing of floods had negative effects on body condition, whereas amplitude and mean annual water level improved feeding activity. Therefore, regular floods affect the feeding activity and body condition of piscivorous fish, and the response of each species depends on the existence or absence of pre-adaptation to long periods of starvation. Consequently, considering the role of the flood pulse in determining the availability of feeding resources for early life stages of piscivores, control of the flood pulse by dams is also disadvantageous for piscivorous fish.

scholarly journals Annual Cycle Dampening and the Decrease Predictability of Water Level Fluctuations in a Dam-Regulated Neotropical Floodplain

2019 ◽  
Author(s):  
Jaques Everton Zanon
Keyword(s):  
Water Level ◽  
Annual Cycle ◽  
Flood Pulse ◽  
Paraná River ◽  
Transitional Period ◽  
Dynamical Analysis ◽  
Water Level Fluctuations ◽  
River Floodplain ◽  
Parana River ◽  
Upper Paraná River

AbstractThe flood pulse concept refers to seasonal variations in river water level and is the driving force in river-floodplain systems that ‘responsible for the existence, productivity and interactions’ of these system’s biota. This seasonal variation is inherent to river-floodplain systems and establishes a natural pattern of these ecosystems that has frequently been observed in nature. One particular river-floodplain system of interest is the Upper Parana River and its floodplain, whose upstream contains a reservoir cascade that caused profound alterations on its flooding regime by having diminished flood magnitude, but increased its frequency. In this study, I sought to explore the flood pulse condition in the Upper Paraná River Floodplain by using a set of state-of-the-art spectral and non-linear analyses and a time series of water level fluctuations (1968-2017) from this system. I divided the data into four periods: i) natural regime period, ii) transitional period, iii) dam cascade period, and iv) Primavera’s dam period. Spectral analysis demonstrated a decrease in the annual cycle amplitude, reflected in its power spectrum, which means a weakening in the difference between flood and drought events. Additionally, nonlinear dynamical analysis revealed a less deterministic and predicable behavior leading to more erratic fluctuations jeopardizing the temporal heterogeneity of that system.

scholarly journals Invertebrates associated with Paspalum repens (Poaceae) at the mouth of Caracu Stream (1991-1992), affluent of the Paraná River, Porto Rico - PR - Brazil

2000 ◽  
Vol 43 (3) ◽  
pp. 317-325 ◽  
Author(s):  
Gilza Maria de Souza-Franco ◽  
Alice Michiyo Takeda
Keyword(s):  
Water Level ◽  
River Water ◽  
Sampling Period ◽  
Paraná River ◽  
Low Density ◽  
Sharp Decline ◽  
Parana River ◽  
Left Margin ◽  
Paspalum Repens

Temporal distributions of Paspalum repens at the mouth of the Caracu Stream on the left margin of the Paraná River were characterized and analyzed. Samples of Paspalum repens were taken monthly from March 1991 to February 1992. Fauna consisted of many taxa: Gastropoda, Oligochaeta, Copepoda, Ephemeroptera, Hemiptera, Trichoptera, Lepidoptera, Chironomidae, Coleoptera and Hydracarina. With the exception of May 1991, low density of organisms was registered during the sampling period. During May 1991, a sharp decline in the Paraná River water level was noted. This fact suggested that organisms dispersed in the submersed vegetation during the flooding of the Paraná River must have concentrated in the stream margin and increased the density of organisms at this site. In June 1991, during the lowering of water level a niche reduction occurred. In subsequent months, invertebrates decreased due to predation and competition of many groups.

scholarly journals Spatial and temporal distribution of ''curvina'' larvae (Plagioscion squamosissimus HECKEL, 1840) and its relationship to some environmental variables in the upper Paraná River floodplain, Brazil

2003 ◽  
Vol 63 (3) ◽  
pp. 381-391 ◽  
Author(s):  
M. S. T. Baumgartner ◽  
K. Nakatini ◽  
G. Baumgartner ◽  
M. C. Makrakis
Keyword(s):  
Water Level ◽  
Temporal Distribution ◽  
Paraná River ◽  
Spatial And Temporal Distribution ◽  
River Floodplain ◽  
Parana River ◽  
Upper Paraná River Floodplain ◽  
Upper Paraná River ◽  
Paraná River Floodplain ◽  
Spawning Sites

With the objective of studying the spatial and temporal distribution of ''curvina'' Plagioscion squamosissimus larvae and verifying respective spawning sites, monthly sampling was carried out from March 1993 to February 1994 on the Upper Paraná River floodplain. Using a conical-cylindrical plankton net (0.5 mm mesh), samples were taken from the surface of the water bodies, and in the marginal vegetation a strainer and a dragnet (''picaré'') were used. Water samples were collected for environmental variable analysis (temperature, dissolved oxygen, water pH, and electrical conductivity). Water level data were obtained from hydrometric stations. High average density of larvae was found from December 1993 to February 1994 due to high temperature and water level. The Baía sub-area was shown to be the most important in the larvae catch, probably due to its semi-lotic characteristics. Larvae size distribution was shown to be more frequent in the 4.0 mm standard length class, indicating that the sampling stations were next to the spawning sites.

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