Small scale morphodynamics of shoreface-connected ridges and their impact on benthic macrofauna

Markert, Edith; Kröncke, Ingrid; Kubicki, Adam

doi:10.1016/j.seares.2015.02.001

Cited by 14 publications

(15 citation statements)

References 40 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…With an average tidal range of 2.7 m at its western end and 2.9 m in the front of the mainland, Spiekeroog represents a standard mesotidal system (Hild et al, 1999). Characteristic are shoreface connected ridges in front of the island coastline (Markert et al, 2015). Those ridges running from southwest to northeast in water depths from 4 to 8 m and from southeast to northwest in water depths of 9 to 20 m. Inflowing high tide waters (flood), as well as outflowing low tide waters (ebb) are guessed to pass these reefs alongshore and offshore.…”

Section: Study Sitementioning

confidence: 99%

“…Within the inner nearshore zone, we found three different sediment types: sediments, which contained high contents of sand; sediments, which contained high contents of fine sand; and sediments with increased mud contents (<3% to ∼ 6%). Several studies already showed the relationship between hydrodynamic mediated sediment composition and spatial distribution of macrofauna communities (e.g., Rachor et al, 2007;Kröncke et al, 2011;Schückel et al, 2013;Armonies et al, 2014;Markert et al, 2015). The physical environment can significantly influence food availability and effect sediment stabilization (Brown and McLachlan, 1990;Short, 1996;Defeo and McLachlan, 2005;Defeo et al, 2009).…”

Section: Inner Nearshore Zonementioning

confidence: 99%

“…Studies showed that Magelona johnstonii and Spiophanes bombyx mainly occur in areas of fine sand. They are interface feeding polychaetes present in several subtidal areas of the North Sea (Fiege et al, 2000;Kröncke et al, 2011;Markert et al, 2015). All species probably benefit from food supply via nutrient discharge mediated growth of phytoplankton and microphytobenthos in the nearshore zone (Beck et al, 2017).…”

Section: Outer Nearshore Zone and Offshore Zonementioning

confidence: 99%

“…The tubes of Lanice conchilega can also be detected by hydroacoustic measurements (Galloway and Collins, 1998;Ellingsen et al, 2002;Freitas et al, 2003;Wienberg and Bartholomä, 2005;Markert et al, 2013Markert et al, , 2015. Bartholomä (2006) stated that the occurrence of benthic faunal patterns covering a few m 2 immediately produces changes in backscatter signals.…”

Section: Outer Nearshore Zone and Offshore Zonementioning

confidence: 99%

See 3 more Smart Citations

Near- and Offshore Macrofauna Communities and Their Physical Environment in a South-Eastern North Sea Sandy Beach System

et al. 2018

Self Cite

View full text Add to dashboard Cite

Section: Study Sitementioning

confidence: 99%

Section: Inner Nearshore Zonementioning

confidence: 99%

Section: Outer Nearshore Zone and Offshore Zonementioning

confidence: 99%

Section: Outer Nearshore Zone and Offshore Zonementioning

confidence: 99%

See 2 more Smart Citations

Near- and Offshore Macrofauna Communities and Their Physical Environment in a South-Eastern North Sea Sandy Beach System

et al. 2018

Self Cite

View full text Add to dashboard Cite

“…Crests and troughs of bedforms of varying size (ranging from ripples to megaripples, ridges and runnels, shoreface-connected ridges and sand waves) have been found to have different abiotic conditions (such as sediment grain size and organic matter content) but also to support different benthic communities (e.g. Barros et al 2004, Baptist et al 2006, van Dijk et al 2012, Zonneveld et al 2014, Markert et al 2015. This habitat differentiation, induced by hydrodynamic forces, may counteract the negative effect of the stress of hydro dynamics and disturbance by dune migration on species richness (e.g.…”

Section: Introductionmentioning

confidence: 99%

Response of intertidal benthic macrofauna to migrating megaripples and hydrodynamics

Wal¹,

Ysebaert²,

Herman³

2017

Mar. Ecol. Prog. Ser.

View full text Add to dashboard Cite

Migrating flow-transverse mesoscale intertidal bedforms (megaripples or dunes) may pose disturbance but may also provide heterogeneity in microhabitats to the inhabiting fauna. We investigated how the macrofauna community responds to these migrating intertidal bedforms, based on surveys in the Westerschelde estuary. Considering the entire estuary, lowand high-energy intertidal areas differed in macrofauna, and high-energy flat areas had a macrofauna community intermediate to those in low-energy flat areas and high-energy areas with megaripples. In megaripple areas on a polyhaline and a mesohaline tidal flat, the macrofauna community depended on hydrodynamics, morphodynamics, grain size, elevation and steep ness of the megaripples. The relative importance of the environmental variables for structuring the macrofauna community differed for each site. Within the megaripples, conditions on crests, at flanks and in troughs were distinctly different: crests had more chl a and coarser sediment than troughs, while flanks had intermediate levels; troughs were higher in carbon and mud content than flanks and crests. The microhabitats supported a different macrofauna community but with a very large overlap in species. Troughs typically had higher species richness, while crests had higher densities of, in particular, (mobile) surface deposit feeders. Part of the macrofauna could benefit from the habitat heterogeneity within the megaripples, but the effect was relatively small. The distribution of macrofauna in the intertidal zone was particularly regulated by overall current velocities and bedform morphodynamics.

show abstract

Biogeomorphology in the marine landscape: Modelling the feedbacks between patches of the polychaete worm Lanice conchilega and tidal sand waves

Damveld

Borsje

Roos

et al. 2020

Earth Surf Processes Landf

View full text Add to dashboard Cite

Tidal sand waves are dynamic bedforms found in coastal shelf seas. Moreover, these areas are inhabited by numerous benthic species, of which the spatial distribution is linked to the morphological structure of sand waves. In particular, the tube‐building worm Lanice conchilegais of interest as this organism forms small mounds on the seabed, which provide shelter to other organisms. We investigate how the interactions between small‐scale mounds (height ∼⃒dm) and large‐scale sand waves (height ∼⃒m) shape the bed of the marine environment. To this end, we present a two‐way coupled process‐based model of sand waves and tube‐building worm patches in Delft3D. The population density evolves according to a general law of logistic growth, with the bed shear stress controlling the carrying capacity. Worm patches are randomly seeded and the tubes are mimicked by small cylinders that influence flow and turbulence, thereby altering sediment dynamics. Model results relate the patches with the highest worm densities to the sand wave troughs, which qualitatively agrees with field observations. Furthermore, the L. conchilegatubes trigger the formation of sandy mounds on the seabed. Because of the population density distribution, the mounds in the troughs can be several centimetres higher than on the crests. Regarding sand wave morphology, the combination of patches and mounds are found to shorten the time‐to‐equilibrium. Also, if the initial bed comprised small sinusoidal sand waves, the equilibrium wave height decreased with a few decimetres compared to the situation without worm patches. As the timescale of mound formation (years) is shorter than that of sand wave evolution (decades), the mounds induce (and accelerate) sand wave growth on a similar spatial scale to the mounds. Initially, this leads to shorter sand waves than they would be in an abiotic environment. However, near equilibrium the wavelengths tend towards their abiotic counterparts again. © 2020 The Authors. Earth Surface Processes and Landforms published by John Wiley & Sons Ltd

show abstract

Small scale morphodynamics of shoreface-connected ridges and their impact on benthic macrofauna

Cited by 14 publications

References 40 publications

Near- and Offshore Macrofauna Communities and Their Physical Environment in a South-Eastern North Sea Sandy Beach System

Near- and Offshore Macrofauna Communities and Their Physical Environment in a South-Eastern North Sea Sandy Beach System

Response of intertidal benthic macrofauna to migrating megaripples and hydrodynamics

Biogeomorphology in the marine landscape: Modelling the feedbacks between patches of the polychaete worm Lanice conchilega and tidal sand waves

Contact Info

Product

Resources

About