New occurrence of reed bed decline in southern Europe: Do permanent flooding and chemical parameters play a role?

Gigante, Daniela; Angiolini, Claudia; Landucci, Flavia; Maneli, Fabio; Nisi, Bárbara; Vaselli, Orlando; Venanzoni, Roberto; Lastrucci, Lorenzo

doi:10.1016/j.crvi.2014.05.005

Cited by 29 publications

(40 citation statements)

References 86 publications

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“…It is noted that the flights on the study area were conducted during the winter, outside the Phragmites australis vegetative season (Gigante et al . ,b). Moreover, due to abundant rainfall, the lake water level was very high, to the point that most of the reeds were submerged.…”

Section: Resultsmentioning

confidence: 99%

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Unmanned aerial vehicles and Geographical Information System integrated analysis of vegetation in Trasimeno Lake, Italy

et al. 2016

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This study examined the potential of using high-resolution image data acquired by micro-UAV (unmanned aerial vehicle) for analysing large-scale environmental and hydraulic parameters. A procedure based on image data acquisition and processing is discussed and applied to a test case, Trasimeno Lake. This lake was selected for this study because of its importance in cultural, environmental and social context. This study focused on the temporal and spatial scale extension of reed beds (Common Reed). The Common Reed can strongly influence the ecological balance of the lake and particularly its evapotranspiration levels, which significantly influence the lake's water balance. Moreover, the lake provides valuable ecosystem services, including phytoremediation water treatment and the absorption of carbon (carbon sink). A presentation of the study area from a geographical and morphological perspective is provided; then, the platform (UAV and sensors) and the processing system of the images are discussed. The results concerning the accuracy of the method for the construction of georeferenced orthophotographs, and the preliminary results obtained from flights performed at different times and growing seasons of reed beds of Trasimeno Lake, are presented. This study also provides convincing evidence that the orthophotographs obtained with a low-cost UAV system can be used to analyse changes in the extension of the Phragmites australis (Common Reed) of Trasimeno Lake, and the alteration of some environmental parameters of the vegetation, in a temporal and spatial scale. It also highlights that this system can be used to facilitate analyses performed by traditional remote sensing method.

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Section: Resultsmentioning

confidence: 99%

“…Several studies have emphasized that the dieback phenomenon usually occurs at sites where the reeds are submerged, particularly when the hydrological balance has been altered or artificially stabilized (Gigante et al . ).…”

Section: Methodsmentioning

confidence: 97%

Unmanned aerial vehicles and Geographical Information System integrated analysis of vegetation in Trasimeno Lake, Italy

et al. 2016

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“…Even if this species sometimes shows an expansive behavior ( Bertness et al, 2002 ; Foggi et al, 2011 ), since the 1950s an irreversible retreat of the population known as reed die-back syndrome (RDBS) has been observed from several wetlands of northern and central Europe (for a review, see van der Putten, 1997 ). In Italy, it was first detected in a brackish lagoon ( Fogli et al, 2002 ), and recently in freshwater lakes ( Gigante et al, 2011 , 2014 ; Lastrucci et al, 2016a ). Typical symptoms of RDBS include reduced plant height, weaker culms, abnormal rhizomes, formation of clumps ( Armstrong et al, 1996 ; Fogli et al, 2002 ), and eventually retreat of the population ( van der Putten, 1997 ).…”

Section: Introductionmentioning

confidence: 99%

“…Among the abiotic factors, prolonged submersion of the plant appears to have dramatic consequences; Lastrucci et al (2016a) demonstrated the existence of a relationship between reed die-back and permanent-artificially induced flooding conditions. Several macromorphological traits associated with RDBS (such as clumping habit, reduced culm height or diameter, high rate of dead buds, see Gigante et al, 2011 , 2014 ; Lastrucci et al, 2016a for details) were significantly more often observed in permanently flooded stands than in the emerged stands. Furthermore, even if P. australis can tolerate high concentrations of heavy metals ( Bonanno and Lo Giudice, 2010 ), some studies have highlighted their negative effect on plant fitness, suggesting a role in the RDBS ( Gigante et al, 2014 ; Lastrucci et al, 2016a ).…”

Section: Introductionmentioning

confidence: 99%

Oomycete Communities Associated with Reed Die-Back Syndrome

et al. 2017

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Phragmites australis (Cav.) Trin. ex Steud. die-back is a widely-studied phenomenon that was first discovered in northern Europe and that, until recently, was almost unknown in the Mediterranean basin. It has been described as a complex syndrome affecting reed populations leading to their retreat and decline, with significant impacts on valuable ecosystem services. Among the factors that cause the decline, soil-living microorganisms can be crucial. The aims of this study were to analyze the diversity of oomycetes communities associated with reed stands, and to understand whether they could play a key role in the decline. Variations in the structure of oomycetes communities were studied by metabarcoding of the internal transcribed spacer (ITS) 1 region of ribosomal DNA, from the sediments of five Italian freshwater ecosystems. They were chosen to cover a large variability in terms of surface area, water depth, microclimate, and presence of documented reed retreat. From 96 samples collected from reed roots, rhizosphere, and bulk soil, we assembled 207661 ITS1 reads into 523 OTUs. We demonstrated that oomycete communities were structured by several factors, among which the most important was die-back occurrence. Our study also indicates that Pythiogeton spp. could be potentially involved in the development of die-back. The role of heavy metals in the soil was also explored, and cadmium concentration was shown to affect oomycetes distribution. This study represents a significant step forward for the characterization of microbial communities associated with reed die-back syndrome and helps to gain knowledge of the complexity of these important wet ecosystems.

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“…However, this plant underwent a patchy growth and a low survival (<20%). This clumpy habit has been recognised as a symptom of the reed dieback syndrome, commonly observed after prolonged submersion with eutrophic waters (Brix, 1999; Gigante et al, 2014. These issues did not affect the reed growth in the downstream cell of the system, where the water depth was generally lower (0.08-0.20 m) than in the upstream cells (0.15-0.25 m) and reed properly expanded.…”

Section: Discussion Biomass Growth and Nutrient Removalmentioning

confidence: 88%

Comparison of three plants in a surface flow constructed wetland treating eutrophic water in a Mediterranean climate

et al. 2015

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The goal of this study is to examine the suitability of three plants, Typha spp., Phragmites spp. and Iris pseudacorus, in a free water surface constructed wetland created to treat eutrophic water from Lake Albufera (Valencia, Spain), a wetland of international importance. The growth, coverage and nutrient content of the three plants were studied, and chemical analyses were performed according to standard methods. The maximum standing crops measured for each plant were 1.9, 18.2 and 3.3 kg m , respectively, and their average nutrient concentrations were 2.1, 1.2 and 1.7 g P kg and 12.1, 11.7 and 10.1 g N kg , respectively. A multiple harvest of Iris pseudacorus revealed that the removal of nutrients could be increased up to 50% for N and 100% for P compared with a single harvest. Biomass decomposition assays showed high values for five day biochemical oxygen demand (115-207 mg O g , depending on the plant and its age) and a substantial release of phosphorus, up to 100% of that contained in the biomass, highlighting

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New occurrence of reed bed decline in southern Europe: Do permanent flooding and chemical parameters play a role?

Cited by 29 publications

References 86 publications

Unmanned aerial vehicles and Geographical Information System integrated analysis of vegetation in Trasimeno Lake, Italy

Unmanned aerial vehicles and Geographical Information System integrated analysis of vegetation in Trasimeno Lake, Italy

Oomycete Communities Associated with Reed Die-Back Syndrome

Comparison of three plants in a surface flow constructed wetland treating eutrophic water in a Mediterranean climate

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