Biophysical interactions in coastal habitats DOI Open Access

Jan Cornelis de Smit

Published: Feb. 21, 2023

In order to successfully implement nature-based solutions as (part of) coastal defense, there is a need for insight into their efficiency and reliability. The wave-attenuation capacity of vegetated ecosystems like seagrasses salt marshes has been widely studied. However, stability on the medium long term (i.e., engineering timescales) needs be quantified. Key wave attenuating have high internal stability. lateral extent strongly influenced by vertical (sediment) adjacent mudflats / or seagrass meadows. this thesis sediment thresholds subtidal lower intertidal (from meadows up tidal flats) under strong current attack Typically such are measured via field measurements laboratory flume experiments. problem with these approaches is, however, that lack hydrodynamic control, so can only indirectly, experiments require ecosystem transplantation use mimics. Field flumes therefore developed way generate controlled hydrodynamics in situ, used quantify flats (chapters 2 4). We explored Seagrass – Sediment Light (SSL) feedback measuring resuspension various densities types (chapter 3). were able establish general relation between density This was then implemented simplified model which assess effects changes typical waves storminess. found resilient storms, but sensitive wind conditions depending topographical setting. Benthos influence flats. complex interaction, because many species all act differently. different generalized energy consumption. tested approach field, we still large variability Therefore, conducted an experiment where assessed how combinations highly contrasting change 5). strongest individual effect overruled other species. When implementing risk accumulation pollutants microplastics. microplastic trapping within biogenic habitats 6). susceptibility habitat plastic determined ability reduce turbulence near seabed. Furthermore, smaller particles much more likely sequestered they ‘hide’ larger grains.

Language: Английский

Seasonal variability in ecosystem functioning across estuarine gradients: The role of sediment communities and ecosystem processes DOI
Sebastiaan Mestdagh, Xiaoyu Fang, Karline Soetaert

et al.

Marine Environmental Research, Journal Year: 2020, Volume and Issue: 162, P. 105096 - 105096

Published: Aug. 2, 2020

Language: Английский

Citations

12
Experiment Study of the Evolution of Coral Sand Particle Clouds in Water DOI Creative Commons
Jie Chen, Zhen Yao,

Changbo Jiang

et al.

China Ocean Engineering, Journal Year: 2022, Volume and Issue: 36(5), P. 720 - 733

Published: Oct. 1, 2022

Abstract The motion of particle clouds (i.e., sediment clouds) usually can be found in engineering applications such as wastewater discharge, land reclamation, and marine bed capping. In this paper, a series laboratory tests are conducted on coral sand to investigate the shape feature single mixing processes clouds. is measured quantified. experimental results demonstrate that particles tends spherical size decreases, empirical equations were established explain variation D 50 f S,50 sand. Compared with silica sand, evolution cloud still experiences three stages, but threshold for Reynolds number entering next stage changes. Further, normalized axial distance 58% smaller. frontal velocity exhibits similar varying tendency cloud. Considering difference between particles, semi-empirical formula was proposed based original prediction by adding factor data 122 µm⩽ ⩽842 µm. It predict

Language: Английский

Citations

7
Quantifying natural sediment erodibility using a mobile oscillatory flow channel DOI Creative Commons
Jaco C. de Smit, Maarten G. Kleinhans, Theo Gerkema

et al.

Estuarine Coastal and Shelf Science, Journal Year: 2021, Volume and Issue: 262, P. 107574 - 107574

Published: Sept. 11, 2021

Erosion of tidal flats is to a large degree determined by the erosion threshold their cohesive sediments, i.e., critical bottom shear stress identifying onset erosion. Given that erodibility can vary strongly over both space and time, rapid in situ measuring methods for quantifying are needed. As largest changes flat elevation generally observed during storms when wave dominated, we developed mobile Oscillatory-Channel Resuspension flume, OsCaR, as method measure wave-generated on sediment cores directly taken from field. We assessed performance OsCaR-flume conducting measurements range artificial sand – mud mixtures, along natural longshore estuarine type benthic assemblage gradient. Measured sediments matched well with transport theory, indicating able reproduce accurately. Moreover, patterns influence total metabolic rate divided functional groups show capture main processes, they corresponded previous laboratory based studies.

Language: Английский

Citations

9
Effects of Meretrix meretrix on sediment thresholds of erosion and deposition on an intertidal flat DOI
Jiasheng Li, Ya Ping Wang, Jiabi Du

et al.

Ecohydrology & Hydrobiology, Journal Year: 2020, Volume and Issue: 21(1), P. 129 - 141

Published: July 23, 2020

Language: Английский

Citations

7
Benthic estuarine communities' contribution to bioturbation under the experimental effect of marine heatwaves DOI Creative Commons
Marina Dolbeth, Oscar Babé Gómez, Dimítri de Araújo Costa

et al.

Scientific Reports, Journal Year: 2021, Volume and Issue: 11(1)

Published: June 1, 2021

Marine heatwaves are increasing worldwide, with several negative impacts on biological communities and ecosystems. This 24-day study tested heatwaves' effect distinct duration recovery periods benthic estuarine communities' diversity contribution to ecosystem functioning experimentally. The were obtained from a temperate estuary, usually subjected high daily thermal amplitudes. Our goal was understand the response change, including community descriptors behavioural changes expected during heat extremes. We measured composition structural bioturbation process nutrient release as measurements. Overall, our findings highlight potential tolerance of studied species temperature ranges in study, structure similar, independently warming effect. detected slight trend for increase under warming, yet these responses not consistent exposure duration. we conclude complexity importance scalable experiments organisms' climate variability, accommodating longer time scales replication. Such an approach would set more efficient expectations towards change mitigation or adaptation

Language: Английский

Citations

7
Juvenile growth deficit as an early alert of cockle Cerastoderma edule mortality DOI Creative Commons

Xavier de Montaudouin,

S Grimault,

M Grandpierre

et al.

Marine Ecology Progress Series, Journal Year: 2021, Volume and Issue: 679, P. 85 - 99

Published: Sept. 20, 2021

In the population dynamics of bi-phasic marine invertebrates, fitness one stage in life a cohort affects that following stage. This effect makes prediction fate challenging. We conducted 22 yr monthly survey cockles Cerastoderma edule focussed on juvenile Two types years were distinguished terms longevity: low-mortality group (‘L’) and high-mortality (‘H’). The cockle shell lengths 0 + cohorts was higher L group, August September. A could hereby confidently be assigned to or H as soon August. Maximum abundance cohorts, parasite load, date recruitment did not discriminate groups, while an early for peak related group. maximum air temperature chl concentration July whereas minimum salinity during month September slightly lower years. Therefore, length under given threshold identified alert short lifespan cohort. long-term analysis contributes deeper understanding invertebrates. success juveniles is solely intensity mortality by predation, but also linked their fitness, growth rates appearing proxy.

Language: Английский

Citations

6
A cockle-induced bioturbation model and its impact on sediment erodibility: A meta-analysis DOI

Amélie Lehuen,

Francis Orvain

The Science of The Total Environment, Journal Year: 2023, Volume and Issue: 912, P. 168936 - 168936

Published: Dec. 1, 2023

Language: Английский

Citations

2
Stimulating effects of whooper swans’ behaviors on nutrient releasing from the sediments caused by different human feeding intensities in the swan Lake, China DOI Creative Commons
Cheng Chen, Ying Lü, Yuhong Liu

et al.

Ecological Indicators, Journal Year: 2023, Volume and Issue: 154, P. 110818 - 110818

Published: Aug. 16, 2023

In many shallow water lakes of China, as the numbers tourists observing waterflow increases, amount supplemental food provided to also increases. However, little attention has been paid role waterfowl's behavior perturbation in N and P nutrients releasing from sediment. this study, five feeding experiments were undertaken Swan Lake (Shandong Province, northern China) during wintering season a noticeable release all was found by disturbance swan behaviors. The TN TP through three stages including non-release stage, rapid stable stage. Moreover, influenced changes triggered frequency swans' grazing aggression. aggressive behaviors among swans stirred nutrient (N & P) sediments altered concentrations columns, indicating that may be significant factor affecting Human intensity (HFI) suggested > 850 g corn can an optimal way aid avoiding foraging competition control levels human assessment. Our findings demonstrate under need natural versus artificial scenarios, acted biological pumps increase release. There is for systematic evidence-based strategy swans, with greater restrictions on provision small items scattered visitors. study novel insights into mechanism bioturbation could help inform whooper conservation coastal wetlands nature reserves.

Language: Английский

Citations

1
Osmoregulatory physiology of the angel wing bivalve Cyrtopleura costata (Pholadidae), an estuarine intertidal burrowing mollusc DOI
Nicole Stakowian, Carolina A. Freire

Journal of Molluscan Studies, Journal Year: 2023, Volume and Issue: 90(1)

Published: Dec. 20, 2023

ABSTRACT Cyrtopleura costata is a pholadid bivalve that inhabits tidal flats inside burrows c. 40 cm deep, and its visceral mass outgrows shell significantly. Thus, unlike other bivalves, it cannot isolate soft tissues from the external environment through complete valve closure. One can thus hypothesize this would be inevitably more exposed susceptible to changes in salinity. No information regarding osmoregulatory physiology has been found literature. We investigated how fluids respond seawater dilution concentration, able keep their moisture content. Individuals of C. were acclimated 30‰ then independently stepwise (1 h for each 5‰ change) 25, 20, 15 10‰ or 35, 40, 45 50‰. Isolated tissue slices obtained control animals (30‰) siphon, mantle muscle vitro salines corresponding salinities 10, 30 responded as typical euryhaline osmoconformer between 25 40‰, with haemolymph cavity water being isosmotic medium. However, some ‘buffering’ osmolality was displayed most extreme salinities, 10–20‰ 45–50‰. This could result contraction cellular responses, reducing ‘apparent permeability’ diffusive fluxes; highest capacity maintain constant hydration despite significant osmotic challenge. Both vivo experiments indicated higher tolerance salinity increases than decreases. if global local climate precipitation rates frequent habitat, area occupied by realized niche may reduced.

Language: Английский

Citations

1
Warming alters non-trophic interactions in soft bottom habitats DOI Creative Commons
Simona Laukaityte, Melanie J. Bishop, Laura L. Govers

et al.

Research Square (Research Square), Journal Year: 2024, Volume and Issue: unknown

Published: Feb. 8, 2024

Abstract Though there is mounting evidence that climate warming altering trophic interactions between organisms, its effects on non-trophic remain relatively undocumented. In seagrass systems, the bioturbating activity of infauna influences annual growth by influencing seed burial depth and germination success as well sediment properties. If bioturbation altered warming, consequences may result. Here, we assessed how heatwaves alter rates when no bioturbators (control), single mixtures contrasting feeding activities are present. The three manipulated were surface (top 1-2cm sediment) biodiffusor, brown shrimp ( Crangon crangon ), shallow 3–8 cm) diffusor, common cockle, Cerastoderma edule ) upward (5–15 conveyor, polychaete, Cappitellidae spp. We applied two temperature treatments: (1) a present-day scenario set at average summer habitat (17ºC); (2) heat-wave modeled maximum recorded (26.6ºC). Under conditions, was greater in presence than control where added. Cockles had greatest impact among all bioturbators. scenario, mixed bioturbator treatment increased to match cockle treatment. polychaetes elevated buried seeds under temperature, but not scenario. Overall, these results indicate have potential both amplify disrupt interactions, with implications for germination.

Language: Английский

Citations

0