scholarly journals Modeling the potential distribution of the invasive golden mussel Limnoperna fortunei in the Upper Paraguay River system using limnological variables

2010 ◽  
Vol 70 (3 suppl) ◽  
pp. 831-840 ◽  
Author(s):  
MD Oliveira ◽  
SK Hamilton ◽  
DF Calheiros ◽  
CM Jacobi ◽  
RO Latini
Keyword(s):  
Ecological Niche Modeling ◽  
Saturation Index ◽  
River Estuary ◽  
River System ◽  
Entropy Method ◽  
Limnoperna Fortunei ◽  
Maxent Model ◽  
The North ◽  
Paraguay River ◽  
Golden Mussel

The invasive golden mussel, Limnoperna fortunei (Dunker, 1857), was introduced into the La Plata River estuary and quickly expanded upstream to the North, into the Paraguay and Paraná rivers. An ecological niche modeling approach, based on limnological variables, was used to predict the expansion of the golden mussel in the Paraguay River and its tributaries. We used three approaches to predict the geographic distribution: 1) the spatial distribution of calcium concentration and the saturation index for calcium carbonate (calcite); 2) the Genetic Algorithm for Rule-Set Production (GARP) model; and the 3) Maximum Entropy Method (Maxent) model. Other limnological variables such as temperature, dissolved oxygen, pH, and Total Suspended Solids (TSS) were used in the latter two cases. Important tributaries of the Paraguay River such as the Cuiabá and Miranda/Aquidauana rivers exhibit high risk of invasion, while lower risk was observed in the chemically dilute waters of the middle basin where shell calcification may be limited by low calcium concentrations and carbonate mineral undersaturation.

scholarly journals Density and body size of the larval stages of the invasive golden mussel (Limnoperna fortunei) in two neotropical rivers

2012 ◽  
Vol 23 (3) ◽  
pp. 282-292 ◽  
Author(s):  
Vivianne Eilers ◽  
Márcia Divina de Oliveira ◽  
Kennedy Francis Roche
Keyword(s):  
Body Size ◽  
Larval Stage ◽  
Larval Density ◽  
Limnoperna Fortunei ◽  
Larval Size ◽  
Larval Stages ◽  
Positive Effects ◽  
Paraguay River ◽  
Body Sizes ◽  
Golden Mussel

AIM: The present study involved an analysis of the monthly variations in the population densities and body sizes of the different stages of planktonic larvae of the invasive golden mussel (Limnoperna fortunei), in the rivers Paraguay and Miranda; METHODS: The study was carried out between February 2004 and January 2005. Monthly collection of the plankton samples was accompanied by physical, chemical and biological analyses of the water; RESULTS: The Miranda River presented higher values of calcium, pH, alkalinity, conductivity and total phosphorous. Larval density varied from 0-24 individuals.L-1 in the Paraguay River, with a peak in March of 2004, while in the Miranda River, densities varied between 0-9 individuals.L-1 with a peak in February of 2004. No larvae were encountered during the coldest months, May and June. No significant correlations were found between environmental variables and larval density in either river. Only the valved larval stages were recorded. The "D" and veliger forms were most abundant; umbonate larvae were rare in the Miranda River samples. Mean body sizes of "D", veliger and umbonate larval stages were, respectively, 111, 135 and 152 µm, in the Paraguay River, and 112, 134 and 154 µm in the Miranda River. Principal Components Analysis indicated positive relationships between "D" larval stage size and the ratio between inorganic and organic suspended solids, while negative relationships were found between larval size and calcium and chlorophyll-<img border=0 width=7 height=8 src="/img/revistas/alb/2012nahead/ALB_AOP_230307car01.jpg">; CONCLUSIONS: The larvae were recorded in the plankton during most of the year, with the exception of the two colder months. Neither densities nor larval stage body sizes were significantly different between the two rivers. Possible positive effects of food and calcium concentrations on body size were not recorded. This species may be adapted to grow in environments with elevated sediment concentrations.

scholarly journals More than two decades after the introduction of Limnoperna fortunei (Dunker 1857) in La Plata Basin

2018 ◽  
Vol 78 (4) ◽  
pp. 773-784 ◽  
Author(s):  
M. A. Pessotto ◽  
M. G. Nogueira
Keyword(s):  
River Estuary ◽  
Dispersal Ability ◽  
Limnoperna Fortunei ◽  
Freshwater Bivalve ◽  
Trophic Conditions ◽  
La Plata ◽  
Larval Stages ◽  
Paraguay River ◽  
La Plata Basin ◽  
Fast Flow

Abstract The golden mussel, Limnoperna fortunei, is an Asian freshwater bivalve introduced in South America in the beginning of the 1990’s, probably through ballast water releases in La Plata River estuary. It dispersed north through Paraná, Uruguay and Paraguay Rivers. The study evaluated the macroscale (18° to 34° S; 45° to 60° W) distribution of L. fortunei (larval stages) in the main rivers and reservoirs of La Plata Basin. Samplings were performed through 68 µm vertical plankton net hauls. Limnological variables were simultaneously determined. Larvae abundance correlated significantly with oxygen (positively) in summer, with temperature (positively) in winter and with total phosphorus and total nitrogen (both negatively) in winter. We expected densities to decrease towards north (latitudinal gradient) and increase in lentic conditions (reservoirs). Despite maximum density was found near the introduction point (La Plata River) similar value was also observed 2,000 km north (Paraguay River). The first hypothesis was refuted. The second hypothesis was partially accepted. Abundances were consistently higher in summer. Higher trophic conditions and fast flow seem to inhibit population growth. Food resources (chlorophyll a) locally influenced temporal variation. Limnoperna fortunei is widely distributed in La Plata basin, reaching high larval densities superior to 10,000 ind. m-3, in all major sub-basins. The species exhibits a high intrinsic dispersal ability (free planktonic larvae), wide tolerance to environmental factors and dispersion is potentialized by natural dispersion processes (e.g. fauna displacement) and human facilitation (e.g. commercial navigation).

FÍSICO-QUÍMICA DE ÁGUAS E GEOQUÍMICA DE SEDIMENTOS EM SUSPENSÃO DE RECURSOS HÍDRICOS SUPERFICIAIS DO MUNICÍPIO DE BELÉM, ESTADO DO PARÁ

2021 ◽  
Vol 8 (2021) (1) ◽  
pp. 1-20
Author(s):  
Vânia VIANA ◽  
◽  
Marcondes COSTA ◽  
Darilena PORFÍRIO ◽  
Glayce VALENTE ◽  
...  
Keyword(s):  
Natural Waters ◽  
River Estuary ◽  
River System ◽  
Strong Relationship ◽  
Point Of View ◽  
Physical Parameters ◽  
Human Occupation ◽  
The North ◽  
Geological Unit ◽  
The City

The municipality of Belém is installed on low ground under a rich and immense system of surface waters that converge for the most part directly into the Pará River system, Marajó Bay, northern fathom of the Amazon River and then the Atlantic Ocean. The Guamá river (estuary) and Guajará bay stand out, bathing its western, north and northeast portions, and numerous tidal channels, as well as several streams converge on the former, as well as several swamps and temporary wetlands. The main urban nucleus, the city of Belém, was installed and continues to do so, along the tidal and igarapé channels, modifying its courses, and polluting them brutally, either by solid waste or by domestic effluents of all kinds without any treatment, in addition to industrial contributions, becoming more serious as the city moves forward in horizontal and vertical buildings. The tides partially assist in this cleaning, by carrying a large part of these pollutants daily to the Guamá River, from this one to the Guajará Bay and then Marajó and Atlantic. Beautiful beaches in the north and northeast of the municipality (Outeiro, Mosqueiro, Farol, Ariramba, Carananduba, Paraíso and Baía do Sol) attract thousands of visitors, which further contribute to general pollution. Although several surveys have already been carried out to assess these impacts and its dilution, it was decided to try a new attack, emphasizing the Tucunduba stream and its drainage in the Guamá river, the Guajará bay on its margin of strong industrial-port impact and then the beaches of the Baía do Sol. Water and solid sediment in suspension (suspended) were collected in three different periods, considering the two tidal cycles, in eight seasons. Measurements of the main physical parameters were made in loco. Next, cations and anions in the waters analyzed, mineralogical identification and chemistry of the suspensates, in addition to micromorphological analyzes were carried out. The results show that the Guamá river and Guajará bay can be still classified as unpolluted natural waters, similar to the white waters of the Amazon region. Tucunduba and the waters of the Baía do Sol, mainly those restricted (swamps and manholes) are strongly altered by human occupation. Cations and anions, as well as microplankton from the suspension sediments, also allow identify the seasonal interference of oceanic interference during the dry season. The suspension materials of these rivers are dominated by quartz, kaolinite, partly muscovite / illite, demonstrating a strong relationship with the sediments of the margins, gullies and flood plains, and also of the Barreiras Formation, Neogene in age, the geological unit that serves as a substrate for the lands of Belém municipality. However, for a more informed assessment, a systematic and much more comprehensive study is recommended from the chemical, biological, mineralogical point of view and still under strong seasonal and tidal cycle controls, preferably for a continuous decade.

scholarly journals The ShearStress importance on the spatial distribution pattern of the invader Limnoperna fortunei in the Upper Paraná River Basin. - An assessment based on the Spatial Distribution Models

2016 ◽  
Vol 16 (1) ◽  
Author(s):  
Mônica de Cássia Souza Campos ◽  
Daniel Peifer ◽  
Paulo de Tarso Castro
Keyword(s):  
Spatial Distribution ◽  
River Estuary ◽  
Entropy Method ◽  
Paraná River ◽  
Negative Consequences ◽  
Limnoperna Fortunei ◽  
Distribution Models ◽  
Jackknife Test ◽  
Parana River ◽  
Ecological Requirements

The introduction of the golden mussel, Limnoperna fortunei(Dunker, 1857) in South America was related to the discharge of ballast water, with its first record in 1991 in the La Plata River estuary. Since then, the species is spreading throughout the continent, with several economic and ecological negative consequences. Aim: To model, in the headwaters of Parana River, the spatial distribution ofL. fortunei and to understand the determinants of the current pattern of species distribution and the risk of invasion of areas not yet colonized. Methods: The ecological niche of L. fortunei was modeled using the algorithm MAXENT (Maximum Entropy Method) combined with records of occurrence of the bivalve, limnological data and the shear force measured by the index Hack (SL). The evaluation of the performance of different models was based on AUC (Area Under the Curve).The analysis of each variable's contribution to the responses of the models was made based on the Jackknife test, available in the Maxent program. The models were validated with real absence data collected between 2006 and 2007. Based on the limnological characterization of the area and on outputs of the models, this analysis sought to understand the contributing aspects to the current and potential spatial distribution and to verify the risk of invasion of environments not yet colonized by the species. Results/Conclusion: The limnological characterization showed that the ecological requirements for the species as, pH, calcium, oxygen and chlorophyll a, were appropriate in both the connected stretches, invaded and non-invaded. Turbidity showed significant spatial differences which proved to be higher in environments with higher levels of Hack (SL), i.e. higher energy fluvial. In addition, the algorithm showed the importance of hydrodynamical aspects expressed by Hack index (SL) to the spatial distribution of species, since the models with the best performances were those that considered the Hack index (SL) as one of the environmental layers of the mussel's niche. All models indicated a high risk of invasion into the reservoir of São Simão.

Loadings of Selected Chemicals into the St. Lawrence River System from Lake Ontario, 1986/87

1989 ◽  
Vol 24 (4) ◽  
pp. 589-608 ◽  
Author(s):  
I.K. Tsanis ◽  
J. Biberhofer ◽  
C.R. Murthy ◽  
A. Sylvestre
Keyword(s):  
Mass Balance ◽  
Lake Ontario ◽  
River System ◽  
Vertical Gradient ◽  
The South ◽  
Measured Concentration ◽  
Chemical Monitoring ◽  
The North ◽  
Loading Estimates ◽  
St Lawrence River

Abstract Determination of the mass output through the St. Lawrence River outflow system is an important component in computing mass balance of chemical loadings to Lake Ontario. The total flow rate in the St. Lawrence River System at the Wolfe Island area was calculated from detailed time series current meter measurements from a network of current meters and Lagrangian drifter experiments. This flow is roughly distributed in the ratio of 55% to 45% in the South and North channel, respectively. Loading estimates of selected chemicals have been made by combining the above transport calculations with the ongoing chemical monitoring data at the St. Lawrence outflow. A vertical gradient in the concentration of some organic and inorganic chemicals was observed. The measured concentration for some of the chemicals was higher during the summer months and also is higher in the South Channel than in the North Channel of the St. Lawrence River. These loading estimates are useful not only for modelling the mass balance of chemicals in Lake Ontario but also for serving as input loadings to the St. Lawrence River system from Lake Ontario.

Sources of Chlorophenolic Compounds to the Fraser River Estuary

1988 ◽  
Vol 23 (1) ◽  
pp. 55-68 ◽  
Author(s):  
J. H. Carey ◽  
J. H. Hart
Keyword(s):  
River Flow ◽  
River Estuary ◽  
Low Flow ◽  
Fraser River ◽  
Pulp Mills ◽  
Flow Conditions ◽  
Downstream Site ◽  
Upstream Site ◽  
The North ◽  
Main River

Abstract The identity and concentrations of chlorophenolic compounds in the Fraser River estuary were determined under conditions of high and low river flow at three sites: a site upstream from the trifurcation and at downstream sites for each main river arm. Major chlorophenolics present under both flow regimes were 2,4,6-trichlorophenol (2,4,6-TCP), 2,3,4,6-tetrachlorophenol (2,3,4,6-TeCP), pentachlorophenol (PCP), tetrachloroguaiacol (TeCG) and a compound tentatively identified as 3,4,5-trichloroguaiacol (3,4,5-TCG). Under high flow conditions, concentrations of the guaiacols were higher than any of the Chlorophenols and concentrations of all five chlorophenolics appeared to correlate. Under low flow conditions, concentrations of chloroguaiacols were higher than Chlorophenols at the upstream site and at the downstream site on the Main Arm, whereas at the downstream site on the North Arm, concentrations of 2,3,4,6-TeCP and PCP were higher than the chloroguaiacols in some samples. Overall, the results indicate that pulp mills upstream from the estuary are important sources of chlorophenolics to the estuary under all flow conditions. Additional episodic inputs of 2,3,4,6-TeCP and PCP from lumber mills occur along the North Arm. When these inputs occur, they can cause the concentrations of Chlorophenols in the North Arm to exceed provisional objectives. If chloroguaiacols are included as part of the objective, concentrations of total chlorophenolics in water entering the estuary can approach and exceed these objectives, especially under low flow conditions.

scholarly journals Study of water storage variations at the Pantanal wetlands area from GRACE monthly mass grids

2019 ◽  
Vol 9 (1) ◽  
pp. 133-143
Author(s):  
Ayelen Pereira ◽  
Cecilia Cornero ◽  
Ana C. O. C. Matos ◽  
M. Cristina Pacino ◽  
Denizar Blitzkow
Keyword(s):  
Water Mass ◽  
Spatial Scales ◽  
Water Storage ◽  
Transport Processes ◽  
Satellite Gravity ◽  
The North ◽  
Paraguay River ◽  
Gravity Recovery ◽  
Grace Mission ◽  
Phase Differences

Abstract The continental water storage is significantly in-fluenced by wetlands, which are highly affected by climate change and anthropogenic influences. The Pantanal, located in the Paraguay river basin, is one of the world’s largest and most important wetlands because of the environmental biodiversity that represents. The satellite gravity mission GRACE (Gravity Recovery And Climate Experiment) provided until 2017 time-variable Earth’s gravity field models that reflected the variations due to mass transport processes-like continental water storage changes-which allowed to study environments such as wetlands, at large spatial scales. The water storage variations for the period 2002-2016, by using monthly land water mass grids of Total Water Storage (TWS) derived from GRACE solutions, were evaluated in the Pantanal area. The capability of the GRACE mission for monitoring this particular environment is analyzed, and the comparison of the water mass changes with rainfall and hydrometric heights data at different stations distributed over the Pantanal region was carried out. Additionally, the correlation between the TWS and river gauge measurements, and the phase differences for these variables, were also evaluated. Results show two distinct zones: high correlations and low phase shifts at the north, and smaller correlation values and consequently significant phase differences towards the south. This situation is mainly related to the hydrogeological domains of the area.

scholarly journals Middle Holocene Climate Oscillations Recorded in the Western Dvina Lakeland

Water ◽  
2021 ◽  
Vol 13 (11) ◽  
pp. 1611
Author(s):  
Agnieszka Mroczkowska ◽  
Dominik Pawłowski ◽  
Emilie Gauthier ◽  
Andrey Mazurkevich ◽  
Tomi P. Luoto ◽  
...  
Keyword(s):  
River System ◽  
Summer Temperature ◽  
Human Occupation ◽  
Holocene Climate ◽  
Climate History ◽  
Remarkable Feature ◽  
Climate Oscillations ◽  
Climate Fluctuations ◽  
The North ◽  
The North Atlantic Oscillation

Although extensive archeological research works have been conducted in the Serteya region in recent years, the Holocene climate history in the Western Dvina Lakeland in Western Russia is still poorly understood. The Neolithic human occupation of the Serteyka lake–river system responded to climate oscillations, resulting in the development of a pile-dwelling settlement between 5.9 and 4.2 ka cal BP. In this paper, we present the quantitative paleoclimatic reconstructions of the Northgrippian stage (8.2–4.2 ka cal BP) from the Great Serteya Palaeolake Basin. The reconstructions were created based on a multiproxy (Chironomidae, pollen and Cladocera) approach. The mean July air temperature remained at 17–20 °C, which is similar to the present temperature in the Smolensk Upland. The summer temperature revealed only weak oscillations during 5.9 and 4.2 ka cal BP. A more remarkable feature during those events was an increase in continentality, manifested by a lower winter temperature and lower annual precipitation. During the third, intermediate oscillation in 5.0–4.7 ka cal BP, a rise in summer temperature and stronger shifts in continental air masses were recorded. It is still unclear if the above-described climate fluctuations are linked to the North Atlantic Oscillation and can be interpreted as an indication of Bond events because only a few high-resolution paleoclimatic reconstructions from the region have been presented and these reconstructions do not demonstrate explicit oscillations in the period of 5.9 and 4.2 ka cal BP.

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