Dynamics of shallow lake cover types in relation to Paraná River flood pulses: assessment with multitemporal Landsat data

Gayol, Maira Patricia; Morandeira, Natalia Soledad; Kandus, Patricia

doi:10.1007/s10750-018-3847-x

Cited by 7 publications

(11 citation statements)

References 48 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The SL dynamics during pulses can be described according to changes in their coverage (macrophyte assemblages and open water turbid or clear state). Five cover types have been identified as dominant in SL of the Lower Paraná River floodplain (Gayol et al, 2019) The cover type Dense green vegetation corresponds to high macrophyte density, including emergent and floating vegetation. The vegetation cover is higher than 60%.…”

Section: Shallow Lake Temporal Patternsmentioning

confidence: 99%

“…A SL polygon layer was available from our previous work (Gayol et al, 2019). The SL were delineated using a water frequency analysis over the 1987-2015 time series of the Normalised Difference Vegetation Index derived from Landsat 5-TM and Landsat 8-OLI data, according to Borro et al (2014).…”

Section: Shallow Lake Morphometric Variables Connectivity and Flood F...mentioning

confidence: 99%

“…Besides, SL and their macrophytes can be differently affected by a given flood pulse according to their geomorphological setting and their connectivity to watercourses (Marchetti & Aceñolaza, 2012). Pulses of different duration and intensity affect the SL state (a clear or a turbid open water state with low or high turbidity values, respectively, and a vegetated state where most of the lake is covered by macrophytes) and typical SL dynamics can be dependent on SL connectivity (Gayol et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Distribution patterns of macrophytes in shallow lakes of the lower Paraná River floodplain: Associations with environmental conditions

et al. 2022

Self Cite

View full text Add to dashboard Cite

Macrophytes play key functional and structural roles in floodplain shallow lakes (SL), determining the maintenance of ecosystem functions and sustaining several productive activities. We assessed the relationship between macrophyte community structure (composition, species abundance, and plant diversity) and environmental features (SL dynamics, connectivity, morphometry, flood frequency, and water and sediment physical and chemical variables) in the Lower Paraná River floodplain. Our main hypothesis was that SL macrophyte distribution depends on direct and indirect environmental controls operating at multiple scales. The SL dynamics during the April–November 2017 Paraná River pulse were described according to their coverage changes (vegetation, and turbid or clear open water), which were assessed with supervised classifications on Landsat 8‐OLI scenes. Twenty‐five SL of the Lower Paraná River floodplain were selected to represent all the SL dynamics identified. Ten SL were permanently connected and 15 were disconnected from watercourses. Water and sediment physical and chemical characteristics, macrophyte assemblage composition, and plant species abundance were surveyed at each site in the 2018 summer. Also, SL morphometric parameters and flood frequency were estimated from ancillary geographic data. The direct controlling factors of macrophyte assemblages were water ammonium and water nitrate concentrations, turbidity, and flood frequency. No clear effects of environmental conditions on macrophyte diversity were found. The connectivity of SL with watercourses affected their water and sediment physical and chemical features. Also, SL dynamics during the 2017 pulse were related to flood frequency. As connectivity to watercourses affects SL chemical and physical variables, and SL dynamics were associated with flood frequency, connectivity and SL dynamics indirectly influenced macrophyte assemblage composition. This study improved our understanding of macrophyte distribution patterns in the study area, which was related to several environmental variables operating at different scales. Our results highlight the importance of the variability of hydrological connectivity in promoting environmental heterogeneity in river floodplain systems, which is central to their functioning, and the high biodiversity that characterises these environments.

show abstract

Section: Shallow Lake Temporal Patternsmentioning

confidence: 99%

Section: Shallow Lake Morphometric Variables Connectivity and Flood F...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Distribution patterns of macrophytes in shallow lakes of the lower Paraná River floodplain: Associations with environmental conditions

et al. 2022

Self Cite

View full text Add to dashboard Cite

show abstract

“…South America is the continent with the largest surface covered by wetlands, with the greatest extension being covered by fluvial wetlands associated with the Amazonas, the Orinoco and the Paraguay-Paraná rivers (Junk et al, 2013). These ecosystems' dynamics are mainly controlled by flood pulses (Junk et al, 1989), which determine fluxes of materials and organisms between the river and the floodplain, influence ecological processes, and affect biodiversity patterns (Gayol et al, 2019;Marchetti and Aceñolaza, 2012;Morandeira and Kandus, 2017).…”

Section: Introductionmentioning

confidence: 99%

Monitoring Active Fires in the Lower Paraná River Floodplain: Analysis and Reproducible Reports on Satellite Thermal Hotspots

Morandeira

2021

Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci.

View full text Add to dashboard Cite

Abstract. Floodplain wetlands play a key role in hydrological and biogeochemical cycles and comprise a large part of the world's biodiversity and resources. The exploitation of remote sensing data can substantially contribute to monitoring procedures at broad ecological scales. In 2020, the Lower Paraná River floodplain (also known as Paraná River Delta, Argentina) suffered from a severe drought, and extended areas were burned. To monitor the wildfire situation, satellite products provided by FIRMS-NASA were used. These thermal hotspots – associated with active fires – can be downloaded as zipped spatial objects (point shapefiles) and include recent and archive records from VIRRS and MODIS thermal infrared sensors. The main aim was to handle these data, analyze the number of hotspots during 2020, and compare the disaster with previous years' situation. Using a reproducible workflow was crucial to ingest the zip files and repeat the same series of plots and analyses when necessary. Obtaining updated reports allowed me to quickly respond to peers, technicians, and journalists about the evolving fire situation. A total of 39,821 VIIRS S-NPP thermal hotspots were detected, with August (winter) accounting for 39.8% of the whole year’s hotspots. MODIS hotspots have lower spatial resolution than VIIRS, so the cumulative MODIS hotspots recorded during 2020 were 8,673, the highest number of hotspots of the last 11 years. Scripts were written in R language and are shared under a CC BY 4.0 license. QGIS was also used to generate a high-quality animation. The workflow can be used in other study areas.

show abstract

“…Aquatic environments are influenced by water‐level fluctuations, which may determine the period of growth and development of aquatic organisms and influence the composition of aquatic assemblages (Chu et al, 2019; de Campos et al, 2018; Kann & Walker, 2020). In particular, river–floodplain ecosystems are characterized by seasonal water‐level fluctuations that affect environmental characteristics, community composition and ecological dynamics (Junk et al, 2021), triggering substantial changes in vegetation (Camargo & Esteves, 1996; Franceschi et al, 2000; Gayol et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

The anatomy of two species of emergent macrophytes of the genus Polygonum differentially changes in response to water‐level fluctuations

et al. 2021

View full text Add to dashboard Cite

Temporal fluctuations in water levels are important ecological driving forces in shallow aquatic ecosystems. Alterations to fluviometric levels are even more conspicuous after the construction of dams, and aquatic macrophytes respond with anatomical and morphological adaptations to such changes. We performed an experiment to analyse the anatomical responses of two common Neotropical species of emergent macrophytes (Polygonum ferrugineum and P. acuminatum) to water-level fluctuations.The experiment simulated three water-level variations: constant low water, constant deep water and fluctuating water levels (0.8-m oscillation/6 days; commonly caused by dam operation). We measured anatomical responses of roots (perimeter and number of the intercellular spaces), stems (perimeter and number of the intercellular spaces and cortical thickness) and leaves (palisade and lacunous parenchyma thickness). Water level affected all anatomical traits we measured and all increased when plants remained submerged (high-depth treatment). Compared with P. ferrugineum, P. acuminatum had higher values of both perimeter of the intercellular space in the roots and number of intercellular spaces in the stems. These results indicate that water-level fluctuations influence the anatomy of both species and that, compared with P. ferrugineum, P. acuminatum has greater plasticity and better tolerates submersion. These responses may be explained by the different survival strategies of each species when growing under submersion. Thus, our results reflect the different selective pressures from water levels experienced by these two species during their evolution.

show abstract

Dynamics of shallow lake cover types in relation to Paraná River flood pulses: assessment with multitemporal Landsat data

Cited by 7 publications

References 48 publications

Distribution patterns of macrophytes in shallow lakes of the lower Paraná River floodplain: Associations with environmental conditions

Distribution patterns of macrophytes in shallow lakes of the lower Paraná River floodplain: Associations with environmental conditions

Monitoring Active Fires in the Lower Paraná River Floodplain: Analysis and Reproducible Reports on Satellite Thermal Hotspots

The anatomy of two species of emergent macrophytes of the genus Polygonum differentially changes in response to water‐level fluctuations

Contact Info

Product

Resources

About