Bioturbation and bioirrigation extend the open exchange regions in permeable sediments

  title={Bioturbation and bioirrigation extend the open exchange regions in permeable sediments},
  author={Nils Volkenborn and Lubos Polerecky and Stefanie I C Hedtkamp and Justus E. E. van Beusekom and Dirk de Beer},
  journal={Limnology and Oceanography},
Large‐scale experimental exclusion of lugworms (Arenicola marina) from 400 m2 intertidal fine sand revealed significant effects of their bioturbation and bioirrigation on sediment characteristics, benthic infauna composition, and the dominant mineralization and benthic‐pelagic exchange processes in the sediment. Absence of lugworms resulted in sediment clogging with organic‐rich fine particles, an eightfold decrease in sediment permeability, low oxygen penetration depths, and accumulation of… 

Effects of Bioadvection by Arenicola marina on Microphytobenthos in Permeable Sediments

Enhanced advective supply of nutrients from deeper sediment layers induced by faunal ventilation is an important mechanism that fuels high primary productivity at the surface of permeable sediments even though these systems are generally characterized by low standing stocks of nutrients and organic material.

In situ organism-sediment interactions: Bioturbation and biogeochemistry in a highly depositional estuary

Investigation of the in situ relationship of biogeochemistry and macrofauna bioturbation in Cape Lookout Bight North Carolina found decreased conditions dominated and a thin aerobic sediment layer was visible at the sediment surface, reducing the area of influence ofBioturbators and subsequently the important ecosystem functions these organisms provide.

Bioinfiltration: Irrigation-Driven Transport of Clay Particles Through Bioturbated Sediments

Abstract The transport of clay-size particles into the pore networks of siliciclastic sediments by the bioirrigating activities of burrowing organisms is demonstrated here for the first time. In a

Oscillatory porewater bioadvection in marine sediments induced by hydraulic activities of Arenicola marina

We employed real‐time pressure recording and high temporal resolution two‐dimensional oxygen imaging to characterize the porewater bioadvection related to hydraulic activities of Arenicola marina, a

Effects of the bioturbating lugworm Arenicola marina on the structure of benthic protistan communities

The observed effects of lugworms on protistan structure and composition are due to a combination of direct trophic and indirect sedi- ment- mediated effects, such as disturbance by reworking the sediment, oxygen supply by burrow ventilation and increased pore water exchange due to bioadvection.

Sediment destabilizing and stabilizing bio-engineers on tidal flats: cascading effects of experimental exclusion

Cumulative changes of the sedimentary habitat and cascading effects in the benthic community may explain the persistence of patches that are dominated by either sediment stabilizing or destabilizing species in the assemblage mosaic of intertidal sediments.

Modeling lugworm irrigation behavior effects on sediment nitrogen cycling

Benthic infauna in marine sediments have well-documented effects on biogeochemical cycling, from individual to ecosystem scales, including stimulation of nitrification and nitrogen removal via



Impact of bioroughness on interfacia solute exchange in permeable sediments

We demonstrate the contribution of biogenic sediment microtopography, termed bioroughness, comprising all surface relief created by benthic organisms, on interfacial solute fluxes in permeable beds.

Organic matter flux and reactivity on a South Carolina sandflat: The impacts of porewater advection and macrobiological structures

Study of the flux and fate of reactive organic material (OM) within Debidue Flat, an intertidal sandflat in the North Inlet estuary, South Carolina, demonstrated that this coarse‐grained deposit is a

Transport and mineralization rates in North Sea sandy intertidal sediments, Sylt‐Rømø Basin, Wadden Sea

We investigated the rates of the main microbiological processes (primary production, aerobic and anaerobic carbon degradation) and transport phenomena in an intertidal sand plate with a combination

Influence of the lugworm Arenicola marina on porewater nutrient profiles of sand flat sediments

Findings emphasize the important role of A. marina for nutrient release from Wadden Sea sediments and the enlarged zone of nitrification promotes denitrification and thereby, nitrogen release from sediments.

Advective relief of CO2 limitation in microphytobenthos in highly productive sandy sediments

Following field observations of increased photosynthesis at increased rates of sediment flushing in sandy sediments, we conducted a series of laboratory experiments to elucidate the mechanism behind

Spatial and temporal patterns of mineralization rates and oxygen distribution in a permeable intertidal sand flat (Sylt, Germany)

Oxygen distribution and benthic mineralization rates were investigated in a permeable intertidal sand flat (permeability: 3.9 x 10‐11 m2) in a transect from the low toward the high waterline. At all

Complex burrows of the mud shrimp Callianassa truncata and their geochemical impact in the sea bed

The use of a diver observatory within the seabed, along with in situ measurements, are reported to assess the geochemical impact of the mud-shrimp Callianassa truncata Giard and Bonnier (Decapoda, Thalassinidea), a species that commonly inhabits sandy sediments in the Mediterranean sea.

Seasonal dynamics of benthic O2 uptake in a semienclosed bay: Importance of diffusion and faunal activity

The benthic O2 uptake and the O2 microdistribution in a coastal sediment of Aarhus Bay, Denmark, were investigated during a seasonal study. Measurements were performed in situ by a profiling lander