Application of the ecohydrological concept for sustainable development of tropical floodplains: the case of the upper Paraná River basin

Agostinho, Ângelo Antônio; Gomes, Luiz Carlos; Pelicice, Fernando Mayer; Souza-Filho, Edvard Elias de; Tomanik, Eduardo Augusto

doi:10.2478/v10104-009-0016-x

Cited by 14 publications

(11 citation statements)

References 25 publications

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“…Longterm data indicate that water levels fluctuate, on average, 2.5 m per year with a maximum amplitude of c. 7.5 m (Agostinho et al, 2008b). High water levels predominate between November and March (rainy seasons -spring and summer), with low water levels occurring between April and October (dry seasons -autumn and winter).…”

Section: Study Areamentioning

confidence: 99%

“…connected lakes, secondary channels, isolated lakes and wetland areas) and supporting a high diversity of organisms, particularly fish (Agostinho et al, 2007). Some fish species are migratory and use the running water of the main channel and tributaries of the Paraná River for migration and spawning (Agostinho, Pelicice & Gomes, 2008a;Agostinho et al, 2008b). The success of spawning depends on the presence of an overbank connection between the river and the surrounding lakes during migration, because floodplain lakes are used as nursery areas for the early phase of fish development (Agostinho et al, 2004b).…”

Section: Introductionmentioning

confidence: 99%

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Migratory benthic fishes may induce regime shifts in a tropical floodplain pond

et al. 2012

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Summary 1. Alternative states are a widely recorded phenomenon in shallow lakes, which may shift between turbid‐ and clear‐water conditions. Here, we investigate whether such shifts in a tropical floodplain pond may be related to the effect of the flood pulse regime on the community structures of fish and macrophytes. 2. Using a long‐term data set, we demonstrate how benthic fish migration together with colonisation by submerged plants affected the transition from a turbid to a macrophyte‐dominated state in a floodplain pond without top‐down control. 3. In our study, the turbid state occurred mostly during low water phases and was largely characterised by high values for the biomass of benthic fish, chlorophyll‐a and total phosphorous. 4. During the period of rising water levels, the migration of benthic fish out of the pond occurs simultaneously with the establishment of submerged plants, while water turbidity decreases along with phytoplankton and nutrient concentrations, inducing a clear‐water phase. However, when submerged plants are absent and fish migration is low, a transient state is generated. 5. We suggest that, in contrast to temperate ponds and shallow lakes, where the main driving mechanisms establishing alternative states are related to cascading effects via the food chain, in tropical ponds and shallow lakes it is resuspension of sediments by benthic fish that plays the most significant role in establishing alternative states. However, the effect of the flood pulse regime plays an important role in the temporal dynamics of fish community structure by controlling benthic fish migration.

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Section: Study Areamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Migratory benthic fishes may induce regime shifts in a tropical floodplain pond

et al. 2012

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“…There are strong pieces of evidence demonstrating that this regulation by dams affects the entire biotic structure of floodplains (Agostinho et al, 2004) and causes functional simplification of the fish assemblage in a long-term (Oliveira et al, 2018). Besides, the applicability of the manipulation of the water level has been effective to increase biodiversity in this floodplain (Agostinho, Gomes, Pelicice, Souza-Filho, & Tomanik, 2008;Luz-Agostinho, Agostinho, Gomes, Júlio-Júnior, & Fugi, 2009). Besides, the applicability of the manipulation of the water level has been effective to increase biodiversity in this floodplain (Agostinho, Gomes, Pelicice, Souza-Filho, & Tomanik, 2008;Luz-Agostinho, Agostinho, Gomes, Júlio-Júnior, & Fugi, 2009).…”

Section: Discussionmentioning

confidence: 99%

Fish functional diversity responses following flood pulses in the upper Paraná River floodplain

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Oliveira

Agostinho

et al. 2018

Ecology of Freshwater Fish

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Flood pulses are the main force driving the dynamics of aquatic communities in floodplains. The responses of communities to environmental changes following flood pulses usually demand a time lag to appear and reach the climax. We assembled a data set of 16 years of fish samplings to assess the relationship between water level and four functional diversity measures, in the upper Paraná River floodplain.Specifically, we approached four aspects of each relationship between water level and functional diversity: nature (positive or negative), sensitivity (response intensity), responsiveness (response delay) and extent (response duration). The nature of the relationship between water level and functional diversity was positive in all cases.Functional richness (FRic) responded right after flood pulses, although with shorter extent. Abundance-dependent functional measures (evenness-FEve; divergence-FDiv; and Rao's quadratic entropy-Rao's Q) presented delayed responses, reaching peaks more than 1.5 years after flood pulses. Significant effects of floods on fish functional diversity were observed for more than 3 years, although the highest functional diversity was observed with 1.8 years, on average. More importantly, flood pulses had no longer significant effects on functional diversity after 4 years.Regarding conservation strategies in regulated systems, flood events should occur every 2 or 3 years, with adequate timing (October-November), intensity (up to 450 cm) and duration (at least 50 uninterrupted days). Intervals longer than 3 years or inadequate timing, intensity and duration could dramatically decrease functional diversity and compromise ecosystem services.

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“…The main functioning force in the floodplain is still the flood pulse (Junk, Bayley & Sparks, 1989;Agostinho et al, 2008), which is also considered a homogenisation factor, dispersing species and increasing similarity among the distinct environments of the floodplain. The main functioning force in the floodplain is still the flood pulse (Junk, Bayley & Sparks, 1989;Agostinho et al, 2008), which is also considered a homogenisation factor, dispersing species and increasing similarity among the distinct environments of the floodplain.…”

Section: Using the Framework: Case Studiesmentioning

confidence: 99%

Using space‐for‐time substitution and time sequence approaches in invasion ecology

et al. 2012

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Summary 1. Invasion biologists use two main approaches to evaluate the effects of non‐native species (NNS) on diversity of native species (DNS), namely space‐for‐time and time approaches. These approaches have pitfalls related to lack of controls: the former lacks pre‐invasion data, while the latter often lacks data from non‐invaded sites. 2. We propose a framework that combines space‐for‐time and time approaches and which should result in more focused mechanistic hypotheses and experiments to test the causes of invasibility and the effects of NNS on DNS. We illustrate the usefulness of our framework using two case studies: one with the submersed macrophyte, Hydrilla verticillata, in reservoir and the other with the fish, Geophagus proximus, in a large river–floodplain system. 3. Hydrilla verticillata invaded sites with DNS similar to that found in non‐invaded sites, indicating that biotic and/or abiotic factors did not influence invasion success; however, DNS increased over time in invaded sites compared with non‐invaded sites, suggesting that H. verticillata facilitated natives. In contrast, G. proximus invaded sites with higher DNS than non‐invaded sites, suggesting that biotic and/or abiotic factors favouring natives were important for invasion success, but DNS increased in invaded and non‐invaded sites over time, indicating that an independent factor contributed to DNS increases. 4. Conclusions from both studies would have been inaccurate or incomplete if the space‐for‐time and time approaches had not been used in combination as proposed in our framework.

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Application of the ecohydrological concept for sustainable development of tropical floodplains: the case of the upper Paraná River basin

Cited by 14 publications

References 25 publications

Migratory benthic fishes may induce regime shifts in a tropical floodplain pond

Migratory benthic fishes may induce regime shifts in a tropical floodplain pond

Fish functional diversity responses following flood pulses in the upper Paraná River floodplain

Using space‐for‐time substitution and time sequence approaches in invasion ecology

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