Modelling the response of floodplain aquatic assemblages across the lateral hydrological connectivity gradient

2009 ◽  
Vol 60 (9) ◽  
pp. 924 ◽  
Author(s):  
B. Gallardo ◽  
S. Gascón ◽  
M. González-Sanchís ◽  
A. Cabezas ◽  
F. A. Comín
Keyword(s):  
Controlling Factors ◽  
Additive Models ◽  
Hydrological Connectivity ◽  
River Floodplain ◽  
Assemblage Composition ◽  
Flood Duration ◽  
River Floodplains ◽  
Flood Magnitude ◽  
Overlapping Peaks ◽  
Restoration Measures

Hydrological connectivity is one of the main controlling factors of habitats and aquatic assemblages on river floodplains. Nevertheless, the lack of universal measures of river–floodplain connectivity (i.e. the lateral hydrological connectivity, LHC) limits the comparison of the response of aquatic assemblages to hydrological connectivity and impedes the understanding of floodplain functioning across different systems. To address these needs, we tested the ability of six different LHC surrogates to model changes in richness, abundance and composition of aquatic assemblages across a Mediterranean floodplain (Ebro River, NE Spain). As shown by generalised additive models, LHC surrogates explained 15% to 65% of the richness and abundance of aquatic assemblages. Zooplankton, macroinvertebrates and phytoplankton showed overlapping peaks of richness at flood duration rates of 5, 15 and 30 days year–1 respectively. Redundancy analyses showed that LHC surrogates explained 17% to 37% of aquatic assemblage composition. Distance to the river and flood duration were the most important determinants of macroinvertebrate composition, whereas flood magnitude and water-level variability best accounted for the variance in zooplankton and phytoplankton compositions. Models based on LHC surrogates such as those presented here can help in predicting the consequences of restoration measures and may be useful in setting restoration goals for aquatic assemblages.

Hydrological connectivity drives the propagule pressure of Limnoperna fortunei (Dunker, 1857) in a tropical river–floodplain system

Hydrobiologia ◽  
2021 ◽  
Vol 848 (9) ◽  
pp. 2043-2053 ◽  
Author(s):  
Vanessa Ernandes de Amo ◽  
Jéssica Ernandes-Silva ◽  
Dieison André Moi ◽  
Roger Paulo Mormul
Keyword(s):  
Propagule Pressure ◽  
Hydrological Connectivity ◽  
Limnoperna Fortunei ◽  
Tropical River ◽  
River Floodplain

scholarly journals Evaluation of factors associated with dynamics of Cichla ocellaris invasion of the Upper Paraná River floodplain system, Brazil

2015 ◽  
Vol 66 (1) ◽  
pp. 33 ◽  
Author(s):  
Luis A. Espínola ◽  
Carolina V. Minte-Vera ◽  
Horacio F. Júlio Junior ◽  
Luciano N. Santos ◽  
Kirk O. Winemiller
Keyword(s):  
Secchi Depth ◽  
Paraná River ◽  
Additive Models ◽  
Annual Growth Rate ◽  
River Floodplain ◽  
Parana River ◽  
Upper Paraná River Floodplain ◽  
Upper Paraná River ◽  
Paraná River Floodplain ◽  
Cichla Ocellaris

Invasion by Cichla ocellaris was studied in the Upper Paraná River floodplain. Generalised linear models and the Akaike Information Criterion (AIC) were applied to standardised gill-net catch data (CPUE), with years, rivers, secchi depth, and their respective interactions. Generalised additive models and AIC were used to evaluate relationships of CPUE for C. ocellaris with standard length, sampling year and secchi depth. C. ocellaris was first recorded in 1992 in the Paraná and Ivinheima Rivers. Nevertheless, the CPUE of individuals was very low in the latter until 2000, and the species was not recorded from the Baía River until 2000. In 2001, CPUE of C. ocellaris greatly increased (from 20 to 140) in all three rivers, and this coincided with changes in hydrology and suspended sediment. Greater secchi depth is thought to benefit foraging by these visually oriented, diurnal piscivores. The estimated annual growth rate for local populations was 21% for the Paraná, 42% for the Ivinheima, and 73% for the Baía Rivers. Consequently, relative to other populations, C. ocellaris of the Baía River and, to a lesser degree, the Ivinheima River, appear to be less influenced by density-dependent factors given their more recent invasions of those areas.

Particulate organic matter dynamics in a river floodplain system: impact of hydrological connectivity

2002 ◽  
Vol 156 (1) ◽  
pp. 23-42 ◽  
Author(s):  
Fanni Aspetsberger ◽  
Florian Huber ◽  
Sonja Kargl ◽  
Birgit Scharinger ◽  
Peter Peduzzi ◽  
...  
Keyword(s):  
Organic Matter ◽  
Particulate Organic Matter ◽  
Hydrological Connectivity ◽  
River Floodplain ◽  
Organic Matter Dynamics ◽  
System Impact

scholarly journals Factors controlling litter production in a large Mediterranean river floodplain forest

2010 ◽  
Vol 40 (9) ◽  
pp. 1698-1709 ◽  
Author(s):  
Eduardo González ◽  
Etienne Muller ◽  
Belinda Gallardo ◽  
Francisco Antonio Comín ◽  
María González-Sanchis
Keyword(s):  
Spatial Variability ◽  
Hydrological Regime ◽  
Floodplain Forest ◽  
Soil Conditions ◽  
Litter Production ◽  
Stem Density ◽  
Organic C ◽  
River Floodplain ◽  
Flood Duration ◽  
P Limitation

Although litter production is an essential floodplain forest function, the drivers and their relative importance remain largely unknown, especially in semi-arid rivers. The influence of forest structure, flooding regime, soil conditions, and litterfall chemistry (a total of 17 variables) on spatial variability of litter production within the Middle Ebro River floodplain forests (northeastern Spain) was examined by monitoring litterfall in 12 forest plots in 2007. Linear mixed effects (LME) models, using stem density (SD), river distance (RD) (or soil total organic C (TOC)), and soil total P (TP) as independent predictors, explained 51% of the variance in litter production, while an alternative LME model using SD and P use efficiency (P-NUE) explained 40%. In particular, litter increased with SD and TP and decreased with RD, P-NUE, and TOC. Based on these results, P limitation appears to be controlling litter production in a rather dry hydrological regime. We hypothesized that a deficient sediment input at the plot scale (especially in the outer floodplain), with flood quality (overbank flooding, ground-water seepage, ponding) being a greater determinant than quantity (flood duration, water table levels), might ultimately be responsible for the spatial variability observed in litter production.

Population age structure and growth in four syntopic amphibian species inhabiting a large river floodplain

2003 ◽  
Vol 81 (6) ◽  
pp. 1096-1106 ◽  
Author(s):  
Dan Cogalniceanu ◽  
Claude Miaud
Keyword(s):  
Growth Rate ◽  
Life History ◽  
Age Structure ◽  
Environmental Conditions ◽  
Age Distribution ◽  
Large River ◽  
Danube River ◽  
Population Age Structure ◽  
River Floodplain ◽  
River Floodplains

River floodplains are disturbance-dominated landscapes where floods are major regulators of both aquatic and nearby terrestrial communities. Amphibians are common inhabitants of floodplains and their life cycle depends on both aquatic and terrestrial habitats. We focused on how different syntopic species of amphibians reacted to the environmental conditions of a large river floodplain. We examined life-history traits such as population age structure and growth in small- and large-bodied species of anurans and urodeles in the lower Danube River floodplain in Romania. Two newt species, Triturus vulgaris (small-bodied) and Triturus dobrogicus (large-bodied), and two anuran taxa, Bombina bombina (small-bodied) and the Rana esculenta complex (large-bodied), were included in the study. The ages of individuals estimated by skeletochronology varied from 3 to 5–6 years for T. vulgaris and from 2–3 to 4–5 years for T. dobrogicus. In the anurans, ages varied from 2 to 5 years in B. bombina and from 4 to 10 years in the R. esculenta complex. The numbers of breeding opportunities (i.e., the number of years the adults reproduce) are similar in both newt species (3), while growth rates and age at maturity differ between the large- and small-bodied species. In anurans, the number of breeding opportunities for the smallest species, B. bombina (4), is associated with a high growth rate and earlier maturation. In the larger R. esculenta complex, the higher number of breeding opportunities (7) is associated with a low growth rate and delayed maturation. The study of age distribution and associated parameters provides useful information on population life history. We discuss how age structure and growth of amphibian populations in large river floodplains can be used as indicators of environmental conditions.

scholarly journals Planktonic Protist Biodiversity and Biogeography in Lakes From Four Brazilian River-Floodplain Systems

2018 ◽  
Author(s):  
Guillaume Lentendu ◽  
Paulo Roberto Bressan Buosi ◽  
Adalgisa Fernada Cabral ◽  
Bianca Trevisan Segóvia ◽  
Bianca Ramos de Meira ◽  
...  
Keyword(s):  
Free Living ◽  
Tropical Ecosystems ◽  
River Floodplain ◽  
River Floodplains ◽  
Form Part ◽  
The Tropics

ABSTRACTWhile the biodiversity and biogeography of protists inhabiting many ecosystems have been intensely studied using different sequencing approaches, tropical ecosystems are relatively under-studied. Here we sampled planktonic waters from 32 lakes associated with four different river-floodplains systems in Brazil, and sequenced the DNA using a metabarcoding approach with general eukaryotic primers. The lakes were dominated by the largely free-living Discoba (mostly the Euglenida) and Ciliophora unlike previously sampled Neotropical environments, bu the community similarities between samples were likewise low. These protists inhabiting these floodplains potentially form part of the large diversity of unknown diversity in the tropics.

scholarly journals Current State and Conditions of Landscape Formation of Ilovlya River Floodplain (Middle Don)

2020 ◽  
pp. 33-42
Author(s):  
Denis Solodovnikov ◽  
Stanislav Shinkarenko
Keyword(s):  
Good Condition ◽  
High Water ◽  
Arid Zones ◽  
River Floodplain ◽  
Surface Moisture ◽  
River Floodplains ◽  
Current State ◽  
Species Composition Of Vegetation ◽  
Landscape Formation ◽  
Water Vegetation

The basis for the study is instrumental terrain profiling using level, geobotanical descriptions, GPR studies, soil sections and manual drilling with a soil sampler. The species composition of vegetation indicates very rare and short-term flooding in high water. Vegetation elements of the low floodplain are marked on the areas directly adjacent to the riverbed at altitudes up to 1.5 m above the inter-level level. Further, along the profile, there are no signs of flooding and standing water. In the soil section there are no iron oxide (II and III) and fading of salts in all horizons up to the depth of 150 sm. The borders between horizons are expressed unclear. This indicates sufficient surface moisture and thus washing of the upper horizons of the soil. The floodplain oak forest is in good condition, there are no dry-top trees. This also indicates that the soil and groundwater are not saline. Studies have shown that the location of the groundwater mirror is close to horizontal, and its level exactly corresponds to the water level in the river. This position of the ground water mirror is typical for river floodplains that occupy an intermediate position between the floodplains of humid and arid zones. The relief of the river floodplain was formed in more water years than observed in the late 20th – early 21st centuries. The first floodplain level (low floodplain) has an excess of no more than 1–1.5 meters above the inter-level of the river. In modern hydrological conditions, only this level is guaranteed to flood every spring.

Macroinvertebrate patterns along environmental gradients and hydrological connectivity within a regulated river-floodplain

2008 ◽  
Vol 70 (3) ◽  
pp. 248-258 ◽  
Author(s):  
Belinda Gallardo ◽  
Mercedes García ◽  
Álvaro Cabezas ◽  
Eduardo González ◽  
María González ◽  
...  
Keyword(s):  
Environmental Gradients ◽  
Regulated River ◽  
Hydrological Connectivity ◽  
River Floodplain
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