Ecohydraulics and Aquatic Macrophytes: Assessing the Relationship in River Floodplains

Janauer, Georg A.; Schmidt-Mumm, Udo; Reckendorfer, Walter

doi:10.1002/9781118526576.ch14

Cited by 14 publications

(13 citation statements)

References 61 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…There are four main aquatic plant life forms (Janauer, Schmidt‐Mumm & Reckendorfer ): (i) free floating on the water surface, (ii) rooting in the sediment, but concentrating the leaves near the water surface ( floating leaved ), (iii) rooted, but obligate submerged ( rooted submerged ), and (iv) emergent with only basal stem parts in the water. The first life form (free floating) is the group with the fewest species.…”

Section: Large Variability In Bsi Concentrationsmentioning

confidence: 99%

“…Free floating species, or floating leaved species are less affected by hydrodynamic stress and may generally have an avoidance strategy ( sensu Puijalon et al . ): the leaves float on the water surface and the majority of the water is discharged underneath where little biomass is present (Janauer, Schmidt‐Mumm & Reckendorfer ). This avoidance–tolerance strategies trade‐off has important ecological and evolutionary consequences (Puijalon et al .…”

Section: The Role Of Si As a Functional Trait In Aquatic Vegetationmentioning

confidence: 99%

“…These result in a horizontal force that pulls the shoot, to which the plant resists with a given tensile strength. Because of the less densely vegetated zone underneath the floating leaved biomass of life form 2, less interaction with the flow is expected (the water can flow relatively undisturbed), whereas flow is significantly reduced in dense stands of the rooted submerged life form 3 (Puijalon et al 2011;Janauer, Schmidt-Mumm & Reckendorfer 2013). Emergent species (life form 4), with leaves in the air, need to overcome gravity to keep an upright position.…”

Section: The Role Of Si As a Functional Trait In Aquatic Vegetationmentioning

confidence: 99%

See 2 more Smart Citations

Silicon in aquatic vegetation

Schoelynck

Struyf

2016

Functional Ecology

View full text Add to dashboard Cite

Summary1. Silicon (Si) use by plants has not always received the research attention of other elements. Yet today, the importance of Si for plant functioning is slowly becoming better understood. Si is a crucial element for many terrestrial plant species (especially grasses), yet a recent surge of research has shown that some species of aquatic plants contain significant amounts of Si too. 2. We argue that degree of Si accumulation is a functional trait in aquatic vegetation, with plants adapting to environmental conditions. Aquatic vegetation can show apparent plasticity regarding Si uptake, adaptive to water and wind dynamics, light interception, herbivory and nutrient stress. Beyond a plant physiological viewpoint, high Si uptake results in high BSi in plant litter, which can impact on aquatic decomposition processes. Si content in aquatic vegetation shows intriguing relations with other strength components such as cellulose and lignin. Si content has also been linked to fungal and microbial community, litter stoichiometry and invertebrate shredders: all factors that potentially influence organic turnover in aquatic sediments. 3. Uptake of Si by aquatic vegetation is thus not only an important transient sink for Si in the global biogeochemical Si cycle, it can also affect carbon turnover in aquatic ecosystems. Experimental and field studies should be conducted to elucidate controls on aquatic plant Si uptake, especially focusing on interactive effects of multiple biotic and abiotic factors. This review provides an overview of the state-of-the-art knowledge on silicon in aquatic vegetation.

show abstract

Section: Large Variability In Bsi Concentrationsmentioning

confidence: 99%

Section: The Role Of Si As a Functional Trait In Aquatic Vegetationmentioning

confidence: 99%

Section: The Role Of Si As a Functional Trait In Aquatic Vegetationmentioning

confidence: 99%

See 1 more Smart Citation

Silicon in aquatic vegetation

Schoelynck

Struyf

2016

Functional Ecology

View full text Add to dashboard Cite

show abstract

“…The flow velocity has been considered a primary factor influencing morphology and anatomy of submerged macrophytes (Janauer et al, 2013). For instance, macrophytes under high water velocities exhibit reduced leaf area and length.…”

Section: Discussionmentioning

confidence: 99%

“…River mosses tend to live in fast and shallow waters (Janauer et al, 2010), partially due to their need for constant replenishment of CO 2 and nutrients directly from the water. Actually, macrophytes are classified into categories based on their life forms (e.g., Willby et al, 2000), and this classification is independent of phylogenetic relationships and is based on the way in which the plants grow in relation to their environment (Janauer et al, 2013). Albayrak et al (2012) found that leaf shape is the most important factor determining hydrodynamic interactions in aquatic plants, regarding drag control/reduction.…”

Section: Discussionmentioning

confidence: 99%

The relationship between macroalgal morphological complexity and hydraulic conditions in stream habitats

et al. 2014

View full text Add to dashboard Cite

The effects of habitat complexity have been considered important factors for the evolution of morphological complexity in organisms. We assessed the possible relationship between hydraulic niche conditions and the morphological complexity of algal filaments by sampling four species of macroalgae inhabiting different hydraulic niches in two freshwater streams. These algal species exhibit different fractal dimensions, which were measured by applying a grid method. The results showed that morphological differences are a function of hydraulic niche for stream macroalgae. Algae with complex shape (Nitella wrightii and Batrachosperum puiggarianum) were established in slower flows, while algae with simpler filament shape (Vaucheria sp. and Oedogonium sp.) were more likely to occur in faster water currents. The sites where the species occurred are a reflection of their ability to hold position, which is ultimately driven by their morphology. The influence of flow in stream habitats is an important factor for lotic macroalgae settlement and its effects can be related to evolutionary adjustment of body shape in these environments. We suggest that the morphological structure (here as fractal dimension) of freshwater macroalgae can be considered an adaptation to the costs and benefits exhibited by different hydraulic niches.

show abstract

Towards biogeomorphic river restoration: Vegetation as a critical driver of physical habitat

O'Briain,

Corenblit,

Garófano‐Gómez

et al. 2024

River Research & Apps

View full text Add to dashboard Cite

The current focus of river restoration on flow and sediment transfer without proper consideration of vegetation as a key structuring agent, beyond its stabilising effect, is too simplistic. We contend that vegetation has an essential role in shaping the physical fluvial environment and should be considered equally alongside hydrogeomorphic processes in restoration projects. In support, we introduce engineer plants as important controls, along with flowing water and transported sediments, on the morphodynamics of river systems and associated physical habitat development. The effect of vegetation on channel planform is then summarised, the influence of vegetation on hydrogeomorphic connectivity is outlined, and then the role of vegetation in landform development and habitat provision, as encapsulated in the fluvial biogeomorphic succession model, is described. We then present examples demonstrating how vegetation has contributed to the recovery of degraded rivers through biogeomorphic processes. Finally, we advance the concept of biogeomorphic river restoration by proposing principles to support a closer synthesis of the component sciences and list key areas for practitioners to focus on. Vegetation succession has a significance that goes beyond its physical structure or influence on sediment stability. In many river settings, it is central to channel evolution. The coupled assembly of plant communities and fluvial landforms affect the development of spatially and temporally dynamic habitat through biogeomorphic interactions. Restoration approaches that do not fully consider this dynamic may fail to anticipate river behaviour and recovery trajectories.

show abstract

Ecohydraulics and Aquatic Macrophytes: Assessing the Relationship in River Floodplains

Cited by 14 publications

References 61 publications

Silicon in aquatic vegetation

Silicon in aquatic vegetation

The relationship between macroalgal morphological complexity and hydraulic conditions in stream habitats

Towards biogeomorphic river restoration: Vegetation as a critical driver of physical habitat

Contact Info

Product

Resources

About