Impact of benthos on morphodynamics from a modeling perspective

Arlinghaus, Peter; Zhang, Wenyan; Wrede, Alexa; Schrum, Corinna; Neumann, Andreas

doi:10.1016/j.earscirev.2021.103803

Cited by 17 publications

(18 citation statements)

References 184 publications

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“…A major contribution to sediment stabilization is made by extracellular polymeric substances (EPS) secreted by benthic organisms including microphytobenthos (e.g. diatoms) and bacteria that are correlated with Chlorophyll-a content in the sediment (Arlinghaus et al, 2021). The approach from Paarlberg et al (2005) was adopted to include bio-stabilization by relating the critical shear stress for erosion and erosion rate E r to the stabilization functions f T and f E associated with EPS:…”

Section: Bio-stabilizationmentioning

confidence: 99%

“…Arlinghaus et al 10.3389/fmars.2022.1011760 morphological evolution of complex coastal systems (Murray et al, 2008;Reinhardt et al, 2010;Marani et al, 2010). On the other hand, a recent review by Arlinghaus et al (2021) pointed out that the development of bio-morphodynamic numerical models remains still at an initial stage and these models are of limited use for explanation and prediction of natural systems.…”

Section: Future Research Needsmentioning

confidence: 99%

“…Benthic fauna incorporates all animals living on or within the sea floor. Benthic faunal behaviors are highly complex and variable (Murray et al, 2014;Murray et al, 2017;Dairain et al, 2019), and can influence the stability of coastal morphology in either positive or negative ways depending on a variety of parameters such as age, biomass, community composition, sediment type, hydrodynamics (Arlinghaus et al, 2021). Benthic fauna is known to actively rework sediments and promote soil formation at small spatial scales (from millimeters to meters) within the habitat (Craft, 2000;Valdemarsen et al, 2018), which is via four main functions, namely (1) biomixing which transports and mixes sediment particles horizontally and vertically through foraging and sheltering behaviors (Kristensen et al, 2012;Lindqvist et al, 2016), (2) mediating particle flux over chemical and compositional gradients and grain transformation through processing of food (Andersen and Pejrup, 2011), (3) change of sea bed roughness through allogenic and autogenic structures (Alves et al, 2017), and (4) coating on sediment grain surface by biofilm (Stal, 2010).…”

Section: Introductionmentioning

confidence: 99%

“…In addition, variation in ecological traits may lead to large differences in biomorphodynamics mediated by different species in different circumstances (Viles, 2020). Focus on only a few selected species but omission of other interacting species and feedback mechanisms among themselves and the environment may lead to incomplete or even biased knowledge (Reinhardt et al, 2010;Arlinghaus et al, 2021;Brückner et al, 2021). Despite of an increasing consensus that benthic fauna plays an important role in mediating morphological evolution at spatical scales much larger than its habitat (Nasermoaddeli et al, 2017;Brückner et al, 2021), development of numerical models quantifying associated bio-morphodynamics is still at an explorative stage.…”

Section: Introductionmentioning

confidence: 99%

“…Despite of an increasing consensus that benthic fauna plays an important role in mediating morphological evolution at spatical scales much larger than its habitat (Nasermoaddeli et al, 2017;Brückner et al, 2021), development of numerical models quantifying associated bio-morphodynamics is still at an explorative stage. The hindering factors include not only limited understanding of fundamental biological/bio-physical processes affecting morphological development and dynamic feedback loops among them but also a shortage of data for model calibration and confirmation of simulation results especially at a large spatial scale (Arlinghaus et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

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Small-scale benthic faunal activities may lead to large-scale morphological change- A model based assessment

2022

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A novel 3-dimensional numerical model resolving dynamic interactions between environmental drivers and benthic fauna was applied to an idealized domain as analogous to typical tidal embayments. The aim is to derive insights into the role of benthic fauna in guiding long-term (decadal to centennial) coastal morphological evolution at a system scale. Three major functions by benthic fauna on sediment dynamics, namely bio-destabilization, bio-deposition and bio-stabilization, were incorporated. Results indicate that each of the three functions is able to guide a unique and profound long-term change of the embayment morphology. Bioturbation-induced sediment mixing and bio-destabilization may result in net sediment export out of the embayment, whilst bio-deposition and bio-stabilization tend to alter the embayment toward a net sediment import environment. Benthic fauna is able to modify large-scale hydro-morphology toward a state favorable for living. A combined effect of the three functions is not just a simple neutralization of the opposing impacts between sediment stabilization and destabilization. Rather, it leads to a unique response of the embayment morphology due to interactions between different benthic functional groups. Comparison with a real tidal embayment (Jade Bay from the Wadden Sea) justified a general validity of the model results in terms of statistics in both morphology and benthic fauna, and suggested an equal importance of interactions between benthic fauna and bed morphology and between different benthic functional groups in guiding morphological development of complex coastal systems.

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Section: Bio-stabilizationmentioning

confidence: 99%

Section: Future Research Needsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Small-scale benthic faunal activities may lead to large-scale morphological change- A model based assessment

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Direct Shear Testing of Various Hard Soils and Weak Rocks from Greece

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Ecosystem services provided by freshwater and marine diatoms

et al. 2022

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Diatoms, a unique group of algae colonising a wide range of aquatic habitats and contributing to human well-being in many ways. We list and summarise these services using the classification of the Millennium Ecosystem Assessment (MEA), i.e. supporting, regulating, provisioning and cultural services. The most relevant supporting services are photosynthesis and primary production, as well as sediment formation. They also play a key role in nutrient cycling and habitat provisioning and serve as food for many organisms. Regulating services as oxygen production, climate control or sediment stabilisation are difficult to discuss without diatoms. Many provisioning services, directly used by humans, can be obtained from diatoms. These are tangible products such as medicines and immunostimulants but direct technologies such as wastewater treatment, micro- and nanotechnologies were also developed using diatoms. Studying of the past, present, and future linked to diatoms as a tool for palaeolimnology, ecological status assessment of waters and climate modelling is essential. Finally, the impressive morphology and ornaments of diatom frustules make them one of the most spectacular microorganisms, inspiring artists or providing a number of educational opportunities. Therefore, protecting aquatic habitats they inhabit is not simply a nature conservation issue but the key for human well-being in the future.

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Impact of benthos on morphodynamics from a modeling perspective

Cited by 17 publications

References 184 publications

Small-scale benthic faunal activities may lead to large-scale morphological change- A model based assessment

Small-scale benthic faunal activities may lead to large-scale morphological change- A model based assessment

Direct Shear Testing of Various Hard Soils and Weak Rocks from Greece

Ecosystem services provided by freshwater and marine diatoms

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