Disturbance, succession and stability: a ten year study of temporal variation of species composition after a catastrophic flood in the river Paraná, Argentina

Franceschi, E. A.; Torres, Patricia Susana; Prado, Darién E.; Lewis, Juan Pablo

doi:10.1556/comec.1.2000.2.10

Cited by 8 publications

(12 citation statements)

References 33 publications

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“…In addition, plant species with intermediate ruderalness-competitiveness may play a crucial role in vegetation adaptation to wetland states or in disturbance resistance. The fact that most of the floodplain seems to be covered by ruderal or intermediate ruderal-competitor plants gives to the environment a high ability to recover after disturbances and ordinary floods [69,70].…”

Section: Scenementioning

confidence: 99%

Mapping Plant Functional Types in Floodplain Wetlands: An Analysis of C-Band Polarimetric SAR Data from RADARSAT-2

et al. 2016

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Abstract:The inclusion of functional approaches on wetland characterizations and on biodiversity assessments improves our understanding of ecosystem functioning. In the Lower Paraná River floodplain, we assessed the ability of C-band polarimetric SAR data of contrasting incidence angles to discriminate wetland areas dominated by different plant functional types (PFTs). Unsupervised H/α and H/A/α Wishart classifications were implemented on two RADARSAT-2 images differing in their incidence angles (FQ24 and FQ08). Obtained classes were assigned to the information classes (open water, bare soil and PFTs) by a priori labeling criteria that involved the expected interaction mechanisms between SAR signal and PFTs as well as the relative values of H and α. The product obtained with the shallow incidence angle scene had a higher accuracy than the one obtained with the steep incidence angle product (61.5% vs. 46.2%). We show how a systematic analysis of the H/A/α space can be used to improve the knowledge about the radar polarimetric response of herbaceous vegetation. The map obtained provides novel ecologically relevant information about plant strategies dominating the floodplain. Since the obtained classes can be interpreted in terms of their functional features, the approach is a valuable tool for predicting vegetation response to floods, anthropic impacts and climate change.

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Section: Scenementioning

confidence: 99%

Mapping Plant Functional Types in Floodplain Wetlands: An Analysis of C-Band Polarimetric SAR Data from RADARSAT-2

et al. 2016

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“…Plant communities in tropical seasonally flooded wetlands and floodplain lakes have been thoroughly studied for Northern Australia (Casanova & Brock, 2000;Finlayson, 2005;Warfe et al, 2011), india (Unni, 1971;Middleton, 1999;van der Valk, Middleton, Williams, Mason, & Davis, 1993), and Africa (Rees, 1978;Müller & Deil, 2005). in tropical and subtropical South America studies on the different aspects of the flooding cycles and their effect on aquatic vegetation were carried out in the Orinoco floodplains of Venezuelan (Castroviejo & López, 1985;Rial, 2000;2006), the Amazon (Junk, 1970;1986;Junk & Piedade, 1993;Ferreira, Piedade, Wittmann, & Franco, 2010;Piedade et al, 2010), the Pantanal (Do Prado, Heckman, & Martins, 1994;Frey, 1995;Fortney et al, 2004;Pott & Pott, 2004;Kufner, Scremin-Dias, & GuglieriCaporal, 2011;Pott, Pott, Lima, Moreira, & Oliveira, 2011), coastal Brazil (Rolon, Lacerda, Maltchik, & Guadagnin, 2008), and particularly the Paraná due to increasing river impoundments (e.g., Franceschi, Torres, Prado, & Lewis, 2000;Murphy et al, 2003;Thomaz, Souza, & Bini, 2003;Santos & Thomaz, 2007;Sabattini & Lallana, 2008;Santos & Thomaz, 2008;Padial et al, 2009;Sousa, Thomaz, & Murphy, 2011).…”

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Dinámica estacional de la vegetación litoral en el complejo lagunar inundable Zapatosa, Colombia

Schmidt-Mumm

Janauer

2014

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Floodplain lakes and associated wetlands in tropical dry climates are controlled by pronounced and severe seasonal hydrologic fluctuations. We examined the plant community response to a bimodal flooding pattern in the Zapatosa Floodplain Lake Complex (ZFLC), Northern Colombia. We measured floristic and quantitative change in four sampling periods emphasizing seasonal differences in plant abundance and life-form structure. Of 79 species identified in the lake complex, 52 were used to characterize eight community types via classification and ordination procedures. Results showed that community structure does not change significantly during the flooding/receding stages. But maximum drawdown phase significantly disrupts the aquatic community structure and the exposed shorelines become colonized by ruderal terrestrial plants. Early rainfalls at the beginning of the wet season are emphasized as an important feature of plant regeneration and community development. The general strategy of the ZFLC vegetation can be framed into the flood pulse concept of river-floodplain systems. Thus, plant communities are mainly responding to disturbances and destruction events imposed by extreme water level fluctuations. Rev. Biol. Trop. 62 (3): 1073-1097. Epub 2014 September 01.Key words: Cesar River, flood pulse, littoral, macrophytes, Magdalena River, shallow lakes, bimodal seasonality.Floodplains play an important role regarding the biogeochemistry and ecology of tropical river systems. Plant and animal life of this particular system are adapted to the seasonal variations in space and time caused by extreme water level fluctuations. This seasonality also represents an important factor in the speciation of several aquatic and wetland plants (Haynes & Holm-Nielsen, 1989). The dynamic character of these systems gives rise to complex primary and secondary production processes that are difficult to predict in detail, but nutrient input from rivers and streams are important in general, as a significant contribution can be expected following rainfall from the surrounding watershed. Nutrient cycling proceeds mainly through heterotrophic processes via bacteria, fungi, micro-zooplankton and shreddinginvertebrates (Melack & Fisher, 1990;Wantzen, Yule, Mathooko, & Pringle, 2008;Warfe et al., 2011). The interactions between rivers and their surrounding floodplain motivated Junk, Bayley, and Sparks (1989) to propose the 'flood pulse concept' as a main force controlling the biota of tropical floodplains. They considered the floodplain as the area periodically inundated by the waters of rivers, lakes, lagoons, and/or underground water, or by direct precipitation. The concept aims to explain the physical and chemical conditions that obligate the biota to respond through different phenological, morphological, anatomical and/or physiological adaptations to predictable hydrological cycles. Given its alternation between aquatic and terrestrial phases, the flooded area of the shoreline is defined as 'aquatic-terrestrial transitional zone' (AT...

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“…Los tramos medio e inferior del Río Paraná comprenden una extensa planicie de inundación que no ha sido mayormente afectada por las represas instaladas en el Alto Paraná brasileño y el Paraná Encajonado (Matteucci et al 2004). El problema de la diversidad ha sido abordado por diferentes autores, entre ellos Lewis et al (1987), Zalocar de Domitrovic (1990Domitrovic ( , 1992Domitrovic ( , 1993, Franceschi & Lewis (1991), Marchese & Ezcurra de Drago (1992), Bó & Malvárez (1999), Franceschi et al 2000, que han analizado el problema con diferentes enfoques y métodos, en distintos grupos taxonómicos y escalas, que dificultan su comparación. Por su parte, Neiff (2001) ha brindado una visión general y crítica de la diversidad de los humedales sudamericanos.…”

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“…Al descender las aguas, quedan grandes áreas descubiertas, donde se instala vegetación pionera que evoluciona hasta su estabilización. Este proceso ha sido estudiado en forma descriptiva, detectándose las tendencias generales de largo plazo, luego de la inundación catastrófica de 1982-83 hasta 2000-02 (Franceschi et al 2000, Franceschi et al 2005, Franceschi 2006. Sin embargo, la diversidad se ha descrito de forma puntual, y no comprende las etapas más avanzadas de recuperación de la vegetación en áreas ubicadas al norte y sur del Paraná Medio.…”

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“…Sin embargo, la diversidad se ha descrito de forma puntual, y no comprende las etapas más avanzadas de recuperación de la vegetación en áreas ubicadas al norte y sur del Paraná Medio. Así, en la primera (norte), se utilizó la entropía de Brillouin para estimar la diversidad de las comunidades en 1984 (Lewis et al 1987) y 1988(Franceschi & Lewis 1991; y en el área sur, el índice de Shannon para una serie de años entre 1986 y 1996 (Franceschi et al 2000). Para dichos estudios, la superficie de la unidad muestral y el tamaño de la muestra fueron diferentes, y hasta el momento, no hay un análisis que utilice los mismos índices y que compare diferentes sitios a un mismo tiempo.…”

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Diversidad de la vegetación durante su recuperación tras una creciente extraordinaria del Río Paraná Medio (Argentina)

Franceschi¹,

Torres²,

Lewis³

2009

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Diversity of vegetation during its recovery from a catastrophic flood of the Medium Paraná River (Argentina). River floodplains have a high biological diversity that is intensely influenced by vegetation dynamics, changes in space and time scales, and the river`s hydrological regime. The vegetation composition of the medium and lower Paraná River has been analyzed previously, with different approaches and criteria that cannot be compared. The aim of this study is to analyze the diversity of the herbaceous vegetation over long time spans, from its regeneration after a catastrophic flood to its recovery, in the North and South sites of the flooding valley of the Medium Paraná River. The first sampling of a pioneer community was performed after the 1982-83 catastrophic flood, and included the surveillance of two plots in two successive recovery stages. Floristic composition and cover-abundance of all species were recorded per plot. Floristic richness, using jackknife, Shannon and Hurlbert diversity and Simpson dominance curves were calculated for each site and for each survey, using EcoSim (software). Floristic richness was higher in the North of Medium Paraná, while dominance was higher in the South. Diversity indexes did not varied significantly and resulted in relatively stable values, because its components compensate each other.

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Disturbance, succession and stability: a ten year study of temporal variation of species composition after a catastrophic flood in the river Paraná, Argentina

Cited by 8 publications

References 33 publications

Mapping Plant Functional Types in Floodplain Wetlands: An Analysis of C-Band Polarimetric SAR Data from RADARSAT-2

Mapping Plant Functional Types in Floodplain Wetlands: An Analysis of C-Band Polarimetric SAR Data from RADARSAT-2

Dinámica estacional de la vegetación litoral en el complejo lagunar inundable Zapatosa, Colombia

Diversidad de la vegetación durante su recuperación tras una creciente extraordinaria del Río Paraná Medio (Argentina)

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