scholarly journals Species richness and functional groups of angiosperms from the Paraná River Delta region (Argentina)

Check List ◽  
2015 ◽  
Vol 11 (6) ◽  
pp. 1803 ◽  
Author(s):  
Nora Madanes ◽  
Rubén Darío Quintana ◽  
Patricia Kandus ◽  
Roberto Fabián Bó
Keyword(s):  
Native Species ◽  
Functional Group ◽  
Species Group ◽  
Paraná River ◽  
River Delta ◽  
Delta Region ◽  
Parana River ◽  
Emergent Plants ◽  
Species Groups ◽  
Photosynthetic Type

We provide a checklist of angiosperms collected in the Paraná River Delta Region during the 1990s and early 2000s. Plants were taxonomically identified and classified according to their origin (native/endemic and exotic) and functional group based on their distribution, biological type, morpho-ecology, photosynthetic type and life cycle. A total of 79 families and 375 species were recorded, of which 87.5% were native (46.93% of subtropical-temperate distribution) and 12.5% were exotic (62.72% of temperate distribution). The herbaceous broadleaf and graminoid vegetation predominated in native (76.65%) and exotic (82.35%) species groups. There were only equisetoid herbaceous plants in native species group. Rooted emergent plants and the C3 functional group predominated among native (88.69% and 80.62%, respectively) and exotic (100% in both cases) species groups. Most of the native plants (85.23%) were perennials, while annuals and perennials were equally represented among the exotic species.

In vitro isolation and infection intensity of Rickettsia parkeri in Amblyomma triste ticks from the Paraná River Delta region, Argentina

2014 ◽  
Vol 5 (6) ◽  
pp. 924-927 ◽  
Author(s):  
Lucas D. Monje ◽  
Santiago Nava ◽  
Leandro R. Antoniazzi ◽  
Valeria C. Colombo ◽  
Pablo M. Beldomenico
Keyword(s):  
Infection Intensity ◽  
Paraná River ◽  
River Delta ◽  
Delta Region ◽  
Rickettsia Parkeri ◽  
Parana River ◽  
Amblyomma Triste

scholarly journals Invasive non-native species of fish in upper Paraná river Basin, Brazil: variations of caloric content in Cichla kelberi

2012 ◽  
Vol 10 (2) ◽  
pp. 401-408 ◽  
Author(s):  
Luis Alberto Espínola ◽  
Horácio Ferreira Júlio Junior ◽  
Evanilde Benedito
Keyword(s):  
Native Species ◽  
Condition Factor ◽  
Gonadosomatic Index ◽  
Reproductive Period ◽  
Paraná River ◽  
Caloric Content ◽  
Fish Food ◽  
Gonadal Maturation ◽  
Parana River ◽  
Upper Paraná River

The allocation of assimilated energy may be influenced by seasonal changes, growth, and reproductive cycle of fish, food consumption and environmental conditions. The objective of this research was to evaluate the energetic variations of Cichla kelberi in the upper Paraná River floodplain, analyzing the caloric content in muscles, gonadosomatic index (GSI), and the condition factor between assessed systems, sex, and stage of gonadal maturation. The results obtained in the present study permit assuring that this is a species that efficiently converts the resources of the environment into energy. Although presenting higher condition factor in the environment where there is a greater ease in getting food (Paraná subsystem), the energy identified in the muscles was the same in both subsystems. During the process of gonadal maturation there is optimization in energy accumulation in the muscles of females, before and after reproductive period, and somatic growth occurs significantly when the individual is not reproducing. Further detailed studies on ecological mechanisms influencing the success of the species, as the presence of competitors and preference for native preys, are needed to implement effective management measures aimed at preventing that the species proliferation in the environment is even more damaging to local biodiversity.

Soil volume and carbon storage shifts in drained and afforested wetlands of the Paraná River Delta

2012 ◽  
Vol 112 (1-3) ◽  
pp. 359-372 ◽  
Author(s):  
Darío S. Ceballos ◽  
Jorge Frangi ◽  
Esteban G. Jobbágy
Keyword(s):  
Carbon Storage ◽  
Paraná River ◽  
River Delta ◽  
Parana River ◽  
Soil Volume

scholarly journals Patterns of food resource use by two congeneric species of piranhas (Serrasalmus) on the upper Paraná river floodplain

2003 ◽  
Vol 63 (2) ◽  
pp. 177-182 ◽  
Author(s):  
C. S. Agostinho ◽  
N. S. Hahn ◽  
E. E. Marques
Keyword(s):  
Resource Use ◽  
Native Species ◽  
Feeding Strategy ◽  
Food Resource ◽  
Paraná River ◽  
Activity Period ◽  
Parana River ◽  
Invading Species ◽  
Upper Paraná River Floodplain ◽  
Upper Paraná River

Serrasalmus marginatus invaded the Upper Paraná River after construction of the Itaipu Dam in November 1982. This was followed by a reduction in abundance of the native species S. spilopleura. Analysis of the pattern of food resource use revealed that both species employ the same feeding strategy, eating mainly fish (whole fish or muscle fragments) and fins bitten off their prey. The diurnal activity period and the feeding rhythm were better-defined in S. marginatus. For young individuals of both species, food was taken in a significantly discontinuous manner (F = 2.83; p < 0.05 and F = 13.25; p < 0.05), with a peak at 4 p.m. Ontogenetic differences in diet, the strong feeding overlap of larger individuals of S. marginatus and smaller individuals of S. spilopleura, and the aggressiveness of S. marginatus in establishing feeding territories may have contributed to the success of the invading species.

scholarly journals Post-Fire Effects in Wetland Environments: Landscape Assessment of Plant Coverage and Soil Recovery in the Paraná River Delta Marshes, Argentina

Fire Ecology ◽  
2012 ◽  
Vol 8 (2) ◽  
pp. 17-37 ◽  
Author(s):  
Mercedes Salvia ◽  
Darío Ceballos ◽  
Francisco Grings ◽  
Haydee Karszenbaum ◽  
Patricia Kandus
Keyword(s):  
Fire Effects ◽  
Paraná River ◽  
River Delta ◽  
Landscape Assessment ◽  
Parana River ◽  
Plant Coverage ◽  
Post Fire Effects ◽  
Soil Recovery

Resource use in the Parana River Delta (Argentina): moving away from an ecohydrological approach?

2008 ◽  
Vol 8 (2-4) ◽  
pp. 245-262 ◽  
Author(s):  
Claudio R.M. Baigún ◽  
Alba Puig ◽  
Priscilla G. Minotti ◽  
Patricia Kandus ◽  
Ruben Quintana ◽  
...  
Keyword(s):  
Resource Use ◽  
Paraná River ◽  
River Delta ◽  
Parana River

Dynamics of Exposure toRickettsia parkeriin Cattle in the Paraná River Delta, Argentina

2016 ◽  
Vol 53 (3) ◽  
pp. 660-665 ◽  
Author(s):  
L. D. Monje ◽  
F. B. Costa ◽  
V. C. Colombo ◽  
M. B. Labruna ◽  
L. R. Antoniazzi ◽  
...  
Keyword(s):  
Paraná River ◽  
River Delta ◽  
Parana River

scholarly journals Long-term colonisation and propagule pressure of fish assemblages in a Neotropical floodplain

2021 ◽  
Author(s):  
Luis Artur Valões Bezerra ◽  
Simone Libralato ◽  
Jan Kubecka ◽  
Andre Padial
Keyword(s):  
Biological Invasions ◽  
Native Species ◽  
Fish Assemblages ◽  
Biotic Resistance ◽  
Propagule Pressure ◽  
Paraná River ◽  
River Floodplain ◽  
Parana River ◽  
Paraná River Floodplain

Abstract Biological invasions are a major threat to biodiversity in the Neotropical region. However, few studies have evaluated the mechanisms underlying the long-term establishment of fish propagules in aquatic environments. Here, we associated fish biomass, species richness, and proportion of non-native species (contamination index) to quantify propagule and colonisation pressures, and fish biodiversity (measured by the Kempton’s index) in lakes and rivers of the Parana River floodplain. We organised species into native and non-native assemblages sampled by gillnetting and beach seining in spatio-temporal gradients, seasonally, from 2000 to 2017. Native and non-native Kempton’s indices were inversely correlated, native extinctions occurred locally with non-native biotic differentiation in lakes, rivers, and ecosystem contamination. A constant propagule pressure resulted in an overwhelming biodiversity of non-natives at the end of the evaluated time series. Biotic resistance to introduction was not evidenced in our deterministic trends. The observed patterns agreed with previous studies highlighting native biotic homogenisation and species extinctions, depending on biological invasions, landscape connectivity, and riverine impoundments. Long-term propagule pressure and non-native fish colonisation were the drivers of biodiversity that led to the predominance of non-native over native assemblages in the Parana River floodplain.

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