Academic literature on the topic 'Bioirrigation'
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Bioirrigation.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Journal articles on the topic "Bioirrigation"
1
Borger, Emil De, Justin Tiano, Ulrike Braeckman, Tom Ysebaert, and Karline Soetaert. "Biological and biogeochemical methods for estimating bioirrigation: a case study in the Oosterschelde estuary." Biogeosciences 17, no. 6 (April 1, 2020): 1701–15. http://dx.doi.org/10.5194/bg-17-1701-2020.
Full textAbstract:
Abstract. Bioirrigation, the exchange of solutes between overlying water and sediment by benthic organisms, plays an important role in sediment biogeochemistry. Bioirrigation either is quantified based on tracer data or a community (bio)irrigation potential (IPc) can be derived based on biological traits. Both these techniques were applied in a seasonal study of bioirrigation in subtidal and intertidal habitats in a temperate estuary. The combination of a tracer time series with a high temporal resolution and a mechanistic model allowed for us to simultaneously estimate the pumping rate and the sediment attenuation, a parameter that determines irrigation depth. We show that, although the total pumping rate is similar in both intertidal and subtidal areas, there is deeper bioirrigation in intertidal areas. This is explained by higher densities of bioirrigators such as Corophium sp., Heteromastus filiformis and Arenicola marina in the intertidal, as opposed to the subtidal, areas. The IPc correlated more strongly with the attenuation coefficient than the pumping rate, which highlights that the IPc index reflects more the bioirrigation depth than the rate.
2
Furukawa, Yoko, Samuel J. Bentley, and Dawn L. Lavoie. "Bioirrigation modeling in experimental benthic mesocosms." Journal of Marine Research 59, no. 3 (May 1, 2001): 417–52. http://dx.doi.org/10.1357/002224001762842262.
Full text
3
Gogina, Mayya, Judith Rahel Renz, Stefan Forster, and Michael L. Zettler. "Benthic Macrofauna Community Bioirrigation Potential (BIPc): Regional Map and Utility Validation for the South-Western Baltic Sea." Biology 11, no. 7 (July 20, 2022): 1085. http://dx.doi.org/10.3390/biology11071085.
Full textAbstract:
Benthic community bioirrigation potential (BIPc), an index developed to quantify the anticipated capacity of macrofauna to influence the solute exchange at the sediment–water interface, was calculated for the south-western Baltic Sea. This index can be regarded as an effect trait that is useful for predicting ecosystem processes impacted by animal burrow ventilation. The special feature, and presumably an advantage, of BIPc, compared to alternative recently developed benthic macrofauna-based bioirrigation indices, lies in its ability to distinguish the taxa-specific score values between diffusion- and advection-dominated sediment systems. The usefulness of the BIPc index was compared against the estimates of the well-established community bioturbation potential index (BPc). The BIPc index displayed a moderately but significantly stronger correlation with estimates of irrigation rates derived from tracer experiments. Using a random forest machine learning approach and a number of available relevant environmental predictor layers, we have modelled and mapped the spatial differences in this ecosystem functioning expression. The key species contributing to bioirrigation potential in the study area were identified. The interannual variation in BIPc was assessed on a small exemplary dataset. The scores required to calculate the index, that were assigned to 120 taxa dominating abundance and biomass in the region, are provided for reuse. The utility, temporal variability and uncertainty of the distribution estimate are discussed.
4
Miernik, Natalia Anna, Urszula Janas, and Halina Kendzierska. "Role of Macrofaunal Communities in the Vistula River Plume, the Baltic Sea—Bioturbation and Bioirrigation Potential." Biology 12, no. 2 (January 18, 2023): 147. http://dx.doi.org/10.3390/biology12020147.
Full textAbstract:
Macrozoobenthos plays a key role in the transformation of inputs from rivers to the sea, such as nutrients, organic matter, or pollutants, and influences biogeochemical processes in the sediments through bioturbation and bioirrigation activity. The purpose of our study was to determine the structure of benthic communities, their bioturbation (BPC) and bioirrigation potential (IPC), and the vertical distribution of macrofauna in the Gulf of Gdańsk. The study revealed changes in the structure of benthic communities and, consequently, in the bioturbation and bioirrigation potential in the study area. Despite the presence of diverse and rich communities in the coastal zone, BPC and IPC values, although high, were formed by a few species. Both indices were formed mainly by the clam Macoma balthica and polychaetes, although the proportion of polychaetes in IPC was higher than in BPC. In the deepest zones, the communities became poorer until they eventually disappeared, along with all macrofaunal functions. Both indices changed similarly with distance from the Vistula River mouth, and there was a very strong correlation between them. We also demonstrated that the highest diversity of the macrofauna was observed in the upper first cm of the sediment, but the highest biomass was observed in deeper layers—at a depth of up to 6 cm, and single individuals occurred even below 10 cm.
5
Fischer, D., H. Sahling, K. Nöthen, G. Bohrmann, M. Zabel, and S. Kasten. "Interaction between hydrocarbon seepage, chemosynthetic communities and bottom water redox at cold seeps of the Makran accretionary prism: insights from habitat-specific pore water sampling and modeling." Biogeosciences Discussions 8, no. 5 (September 29, 2011): 9763–811. http://dx.doi.org/10.5194/bgd-8-9763-2011.
Full textAbstract:
Abstract. The interaction between fluid seepage, bottom water redox, and chemosynthetic communities was studied at cold seeps across one of the world's largest oxygen minimum zones (OMZ) located at the Makran convergent continental margin. Push cores were obtained from seeps within and at the lower boundary of the core-OMZ with a remotely operated vehicle. Extracted pore water was analyzed for sulfide and sulfate contents. Depending on oxygen availability, seeps were either colonized by microbial mats or by mats and macrofauna. The latter, including ampharetid polychaetes and vesicomyid clams, occurred in distinct benthic habitats which were arranged in a concentric fashion around gas orifices. At most sites colonized by microbial mats, hydrogen sulfide was exported into the bottom water. Where macrofauna was widely abundant, hydrogen sulfide was consumed within the sediment. Numerical modeling of pore water profiles was performed in order to assess rates of fluid advection and bioirrigation. While the magnitude of upward fluid flow decreased from 11 cm yr−1 to <1 cm yr−1 and the sulfate/methane transition zone (SMTZ) deepened with increasing distance from the central gas orifice, the fluxes of sulfate into the SMTZ did not significantly differ (6.6–9.3 mol m−2 yr−1). Depth-integrated rates of bioirrigation increased from 162 cm yr−1 in central habitats characterized by microbial mats and sparse macrofauna to 348 cm yr−1 in habitats of large and small vesicomyid clams. These results reveal that chemosynthetic macrofauna inhabiting the outer seep habitats at the lower boundary of the OMZ efficiently bioirrigate and thus transport sulfate into the upper 10 to 15 cm of the sediment. In this way bioirrigation compensates for the lower upward flux of methane in outer habitats and stimulates rates of anaerobic oxidation of methane (AOM) with sulfate high enough to provide sulfide for chemosynthesis. Through bioirrigation macrofauna engineer their geochemical environment and fuel upward sulfide flux via AOM. Due to the introduction of oxygenated bottom water into the sediment via bioirrigation the depth of the sulfide sink gradually deepens towards outer habitats. We therefore suggest that – in addition to the oxygen levels in the water column which determine whether macrofaunal communities can develop or not – it is rather the depth of the SMTZ and thus of sulfide production that determines which chemosynthetic communities are able to exploit the sulfide at depth. Moreover, large vesicomyid clams most efficiently expand the sulfate zone in the sediment and cut off smaller or immobile organisms from the sulfide source.
6
Brigolin, Daniele, Christophe Rabouille, Bruno Bombled, Silvia Colla, Salvatrice Vizzini, Roberto Pastres, and Fabio Pranovi. "Modelling biogeochemical processes in sediments from the north-western Adriatic Sea: response to enhanced particulate organic carbon fluxes." Biogeosciences 15, no. 5 (March 5, 2018): 1347–66. http://dx.doi.org/10.5194/bg-15-1347-2018.
Full textAbstract:
Abstract. This work presents the result of a study carried out in the north-western Adriatic Sea, by combining two different types of biogeochemical models with field sampling efforts. A longline mussel farm was taken as a local source of perturbation to the natural particulate organic carbon (POC) downward flux. This flux was first quantified by means of a pelagic model of POC deposition coupled to sediment trap data, and its effects on sediment bioirrigation capacity and organic matter (OM) degradation pathways were investigated constraining an early diagenesis model by using original data collected in sediment porewater. The measurements were performed at stations located inside and outside the area affected by mussel farm deposition. Model-predicted POC fluxes showed marked spatial and temporal variability, which was mostly associated with the dynamics of the farming cycle. Sediment trap data at the two sampled stations (inside and outside of the mussel farm) showed average POC background flux of 20.0–24.2 mmol C m−2 d−1. The difference of organic carbon (OC) fluxes between the two stations was in agreement with model results, ranging between 3.3 and 14.2 mmol C m−2 d−1, and was primarily associated with mussel physiological conditions. Although restricted, these changes in POC fluxes induced visible effects on sediment biogeochemistry. Observed oxygen microprofiles presented a 50 % decrease in oxygen penetration depth (from 2.3 to 1.4 mm), accompanied by an increase in the O2 influx at the station below the mussel farm (19–31 versus 10–12 mmol O2 m−2 d−1) characterised by higher POC flux. Dissolved inorganic carbon (DIC) and NH4+ concentrations showed similar behaviour, with a more evident effect of bioirrigation underneath the farm. This was confirmed through constraining the early diagenesis model, of which calibration leads to an estimation of enhanced and shallower bioirrigation underneath the farm: bioirrigation rates of 40 yr−1 and irrigation depth of 15 cm were estimated inside the shellfish deposition footprint versus 20 yr−1 and 20 cm outside. These findings were confirmed by independent data on macrofauna composition collected at the study site. Early diagenesis model results indicated a larger organic matter mineralisation below the mussel farm (11.1 versus 18.7 mmol m−2 d−1), characterised by similar proportions between oxic and anoxic degradation rates at the two stations, with an increase in the absolute values of oxygen consumed by OM degradation and reduced substances re-oxidation underneath the mussel farm.
7
Meile, Christof, Carla M. Koretsky, and Philippe Van Cappellen. "Quantifying bioirrigation in aquatic sediments: An inverse modeling approach." Limnology and Oceanography 46, no. 1 (January 2001): 164–77. http://dx.doi.org/10.4319/lo.2001.46.1.0164.
Full text
8
Rao, Alexandra M. F., Sairah Y. Malkin, Francesc Montserrat, and Filip J. R. Meysman. "Alkalinity production in intertidal sands intensified by lugworm bioirrigation." Estuarine, Coastal and Shelf Science 148 (July 2014): 36–47. http://dx.doi.org/10.1016/j.ecss.2014.06.006.
Full text
9
Fischer, D., H. Sahling, K. Nöthen, G. Bohrmann, M. Zabel, and S. Kasten. "Interaction between hydrocarbon seepage, chemosynthetic communities, and bottom water redox at cold seeps of the Makran accretionary prism: insights from habitat-specific pore water sampling and modeling." Biogeosciences 9, no. 6 (June 7, 2012): 2013–31. http://dx.doi.org/10.5194/bg-9-2013-2012.
Full textAbstract:
Abstract. The interaction between fluid seepage, bottom water redox, and chemosynthetic communities was studied at cold seeps across one of the world's largest oxygen minimum zones (OMZ) located at the Makran convergent continental margin. Push cores were obtained from seeps within and below the core-OMZ with a remotely operated vehicle. Extracted sediment pore water was analyzed for sulfide and sulfate concentrations. Depending on oxygen availability in the bottom water, seeps were either colonized by microbial mats or by mats and macrofauna. The latter, including ampharetid polychaetes and vesicomyid clams, occurred in distinct benthic habitats, which were arranged in a concentric fashion around gas orifices. At most sites colonized by microbial mats, hydrogen sulfide was exported into the bottom water. Where macrofauna was widely abundant, hydrogen sulfide was retained within the sediment. Numerical modeling of pore water profiles was performed in order to assess rates of fluid advection and bioirrigation. While the magnitude of upward fluid flow decreased from 11 cm yr−1 to <1 cm yr−1 and the sulfate/methane transition (SMT) deepened with increasing distance from the central gas orifice, the fluxes of sulfate into the SMT did not significantly differ (6.6–9.3 mol m−2 yr−1). Depth-integrated rates of bioirrigation increased from 120 cm yr−1 in the central habitat, characterized by microbial mats and sparse macrofauna, to 297 cm yr−1 in the habitat of large and few small vesicomyid clams. These results reveal that chemosynthetic macrofauna inhabiting the outer seep habitats below the core-OMZ efficiently bioirrigate and thus transport sulfate down into the upper 10 to 15 cm of the sediment. In this way the animals deal with the lower upward flux of methane in outer habitats by stimulating rates of anaerobic oxidation of methane (AOM) with sulfate high enough to provide hydrogen sulfide for chemosynthesis. Through bioirrigation, macrofauna engineer their geochemical environment and fuel upward sulfide flux via AOM. Furthermore, due to the introduction of oxygenated bottom water into the sediment via bioirrigation, the depth of the sulfide sink gradually deepens towards outer habitats. We therefore suggest that – in addition to the oxygen levels in the water column, which determine whether macrofaunal communities can develop or not – it is the depth of the SMT and thus of sulfide production that determines which chemosynthetic communities are able to exploit the sulfide at depth. We hypothesize that large vesicomyid clams, by efficiently expanding the sulfate zone down into the sediment, could cut off smaller or less mobile organisms, as e.g. small clams and sulfur bacteria, from the sulfide source.
10
He, Yi, Bin Men, Xiaofang Yang, Yaxuan Li, Hui Xu, and Dongsheng Wang. "Investigation of heavy metals release from sediment with bioturbation/bioirrigation." Chemosphere 184 (October 2017): 235–43. http://dx.doi.org/10.1016/j.chemosphere.2017.05.177.
Full textDissertations / Theses on the topic "Bioirrigation"
1
Grigg, Nicola Jane, and nicky grigg@csiro au. "Benthic Bulldozers and Pumps: Laboratory and Modelling Studies of Bioturbation and Bioirrigation." The Australian National University. Centre for Resource and Environmental Studies, 2003. http://thesis.anu.edu.au./public/adt-ANU20060228.104425.
Full textAbstract:
Aquatic sediments are the recipients of a continual rain of organic debris from the water column. The decomposition reactions within the sediment and the rates of material exchange between the sediment and water column are critically moderated by the transport processes within the sediment. The sediment and solute movement induced by burrowing animals bioturbation and bioirrigation far exceed abiotic transport processes such as sedimentation burial and molecular diffusion. Thalassinidean shrimp are particularly abundant burrowing animals. Living in high density populations along coastlines around the world, these shrimp build complex burrow networks which they actively maintain and irrigate.¶
I used a laser scanner to map thalassinidean shrimp (Trypaea australiensis) mound formation. These experiments measured rapid two-way exchange between the sediment and depth. Subduction from the sediment surface proved to be just as important as sediment expulsion from depth, yet this is not detected by conventional direct entrapment techniques. The experiments demonstrated that a daily sampling frequency was needed to capture the extent of the two-way exchange.¶
I derived a one-dimensional non-local model accounting for the excavation, infill and collapse (EIC) of burrows. Maximum likelihood analyses were used to test the model against 210Pb and 228Th profiles taken from sediment cores in Port Phillip Bay, Melbourne. The maximum likelihood approach proved to be a useful technique for quantifying parameter confidence bounds and allowing formal comparison with a comparable biodiffusion model. The EIC model generally outperformed the biodiffusion model, and in all cases best EIC model parameter estimates required some level of burrow infill with surface material. The EIC model was expanded to two and three dimensions, which allowed the representation of lateral heterogeneity resulting from the excavation, infill and collapse of burrow structures. A synthetic dataset generated by the two-dimensional model was used to demonstrate the effects of heterogeneity and core sampling on the mixing information that can be extracted from one-dimensional sediment core data.¶
Burrow irrigation brings oxygenated water into burrow depths, and can affect the nitrogen cycle by increasing the rates of coupled nitrification and denitrification reactions. I modelled the nitrogen chemistry in the annulus of sediment surrounding an irrigated burrow using a radially-symmetrical diffusion model. The model was applied to three published case studies involving thalassinidean shrimp experiments and to field data from Port Phillip Bay. The results highlighted divergences between current theoretical understanding and laboratory and field measurements. The model further demonstrated potential limitations of measurements of burrow characteristics and animal behaviour in narrow laboratory tanks. Activities of burrowing animals had been hypothesised to contribute to high denitrification rates within Port Phillip Bay. Modelling work in this thesis suggests that the model burrow density required to explain these high denitrification rates is not consistent with the sampled density of thalassinidean shrimp in the Bay, although dense burrows of other animals are likely to be important. Limitations of one-dimensional representations of nitrogen diagenesis were explored via comparisons between one-dimensional models and the full cylinder model.
2
Grigg, Nicola Jane. "Benthic bulldozers and pumps : laboratory and modelling studies of bioturbation and bioirrigation /." View thesis entry in Australian Digital Theses Program, 2003. http://thesis.anu.edu.au/public/adt-ANU20060228.104425/index.html.
Full text
3
Roskosch, Andrea. "The influence of macrozoobenthos in lake sediments on hydrodynamic transport processes and biogeochemical impacts." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät II, 2011. http://dx.doi.org/10.18452/16423.
Full textAbstract:
Ziel dieser Dissertation ist, Wissensdefizite im Bereich der Bioirrigation von Süßwassersedimenten abzubauen. Als Untersuchungsorganismus wurde Chironomus plumosus ausgewählt weil diese weit verbreitete Larve ihre U-förmigen Röhren mit Überstandswasser durchspült und so Nahrung aus dem Wasser filtriert. Um Bioirrigation in Wohnröhren mit einem Durchmesser von ca. 1,7 mm zu untersuchen, wurden geeignete Messmethoden entwickelt, mit denen für das 4. Larvenstadium die Parameter Fließgeschwindigkeit (14,9 mm/s), Pumpzeit (33 min/h) und Pumprate (61 ml/h) gemessen wurden. Bei einer Populationsdichte von 745 Larven/m2 kann somit ein Wasservolumen äquivalent zum Volumen des Müggelsee in Berlin, innerhalb von 5 Tagen durch das Sediment gepumpt werden. Die Positronen-Emissions-Tomographie wurde für die Sedimentanalytik adaptiert und der Transport im Porenwasser analysiert. Mit den Untersuchungen wure gezeigt, dass auch in schlammigen Seesedimenten ein advektiver Transport durch Bioirrigation verursacht wird, der nicht zu vernachlässigen ist. Steigende Temperaturen resultieren aufgrund steigender Fließgeschwindigkeit in einen signifikanten Anstieg der Pumprate sowie der Eintragsrate von Überstandswasser ins Sediment. Ein abfallender Sauerstoffgehalt verlängert die Pumpzeit und führt zu einer sinkenden Fließgeschwindigkeit. Außerdem wird aus den Untersuchungen eine jahreszeitliche Variabilität der Bioirrigation sichtbar, welche unabhängig von konstanten Laborbedingungen auftritt. Mit dem Wasserstrom werden Porenwasserspezies wie SRP in den Wasserkörper abtransportiert, wohingegen SO42- und O2 aus dem Überstandswasser in das Sediment eingetragen werden. Ferner kommt es zur Oxidation von Fe2+ infolgedessen Phosphat im Sediment festgelegt wird, wie mittels P-Fraktionierung gezeigt werden konnte. Mikrobiologische Untersuchungen zeigten, dass Bioirrigation die mikrobielle Abundanz steigert, die Bakteriengemeinschaft verändert und das Potential zur enzymatischen Hydrolyse erhöht.The aim of this thesis is to fill gaps of knowledge regarding bioirrigation in freshwater sediments. Chironomus plumosus was chosen for the investigations since the filter-feeding larva dwelling in U-shaped burrows is quite common and flushes its burrow with water from the overlying water body. To investigate bioirrigation activity in burrows of approximately 1.7 mm in diameter appropriate measurement techniques were developed. With the methods several parameters were measured for 4th stage of larvae: flow velocity (14.9 mm s-1), pumping time (33 min h-1), and pumping rate (61 ml h-1). Consequently, a water volume equivalent to the volume of Lake Müggelsee in Berlin is pumped through the sediment every 5 days by a population density of 745 larvae m-2. The nuclear medicine imaging technique Positron Emissions Tomography was adapted and used to analyze the transport in the sediment pore water. By means of the experiments, it could be shown that even in muddy lake sediments advection is a relevant transport process and should not be neglected. Rising temperatures result in increased pumping rates and increased influx rates of surface water into the sediment due to increased flow velocities in the burrows. Dropping oxygen concentrations prolong the pumping duration while the flow velocity decreases. Furthermore, experiments show a seasonal variability of bioirrigation which is independent of constant laboratory conditions. Pore water species such as SRP are transported with the water flow into the overlying water body, whereas SO42- and O2 are transported from the overlying water into the sediment. Due to the oxidation of Fe2+, phosphorus is fixed into the sediment, a result confirmed by P-fractionation. Microbiological investigations of the burrow walls demonstrated that the bioirrigation activity enhances the microbial abundance, changes the community structure, and increases the potential of enzymatic hydrolysis.
4
Pascal, Ludovic. "Rôle de l'espèce ingénieure Upogebia pusilla dans le fonctionnement biogéochimique des écosystèmes intertidaux à herbier (Zostera noltei) du bassin d'Arcachon." Thesis, Bordeaux, 2017. http://www.theses.fr/2017BORD0017/document.
Full textAbstract:
Dans le bassin d’Arcachon, le crustacé thalassinidé Upogebia pusilla habite préférentiellement les vasières intertidales colonisées par les zostères naines (Zostera noltei) où il trouve la stabilité sédimentaire indispensable à l’établissement durable de son terrier. Du fait de la profondeur de ce dernier (> 30 cm) et de sa grande mobilité, cette espèce ingénieure a souvent été négligée dans les études antérieures ayant pour objectif de mieux comprendre le rôle des communautés macro-benthiques dans le fonctionnement des herbiers de phanérogames et les conséquences de leur régression rapide. Ce manuscrit présente une étude intégrée du rôle d’U. pusilla dans le fonctionnement de son écosystème en s’attachant particulièrement à caractériser et quantifier les relations entre (1) ses différentes activités (fouissage, ventilation, locomotion, …), (2) les modes de bioturbation qui en résultent et (3)leurs impacts respectifs sur la dynamique biogéochimique sédimentaire. Ce travail montre qu’U. pusilla engendre un remaniement et une bioirrigation intenses de la matrice sédimentaire qui l’entoure. Sa présence stimule ainsi fortement la reminéralisation de la matière organique sédimentée et les échanges de solutés à travers l’interface eau-sédiment.Bien que l’influence d’U. pusilla sur ces processus écologiques et biogéochimiques soit très dépendante des conditions environnementales (e.g., saisonnalité, prévalence parasitaire),l’ensemble de mes résultats suggère que le déclin progressif de ses populations, conséquence directe de la dégradation de son habitat, est susceptible de fortement altérer le fonctionnement global des écosystèmes du bassin d’ArcachonIn Arcachon bay, the endobenthic thalassinid crustacean Upogebia pusilla is tightly associated with the intertidal dwarf grass Zostera noltei providing the sediment stability required for the construction of (semi-)permanent burrows. Because of the depth and complex architecture of their burrow (> 30 cm), this high mobile engineer species have been largely ignored in previous studies aiming at better understanding the role of macrobenthic communities in the functioning of seagrass ecosystems and the consequences of their rapid decline. This manuscript presents an integrated study regarding the role played by U. pusillain the functioning of its ecosystem, with particular emphasis on the characterisation and quantification of the relationships between (1) its different activities (burrowing, ventilating,walking…), (2) both bioturbation modes and rates and (3) their respective impacts on the sedimentary biogeochemical dynamics. This work shows that mud shrimp activity leads tohigh mixing and bioirrigation of the surrounding sediment matrix, thus strongly enhancing organic matter mineralisation processes and solute exchanges across the sediment-water interface. Although the influence of U. pusilla on ecological and biogeochemical processes largely depends on environmental conditions (e.g., seasonality and parasitism), altogether my results suggest that the gradual decline of its population in Arcachon bay, as a direct consequence of benthic habitat degradation, may greatly alter the overall functioning of this vulnerable marine ecosystem
5
Delmotte, Sébastien. "Rôle de la bioturbation dans le fonctionnement biogéochimique de l'interface eau-sédiment : modélisation de la diversité des transports biologiques et effets sur la diagenèse précoce des sédiments d'une retenue." Toulouse 3, 2007. http://www.theses.fr/2007TOU30122.
Full textAbstract:
Cette thèse s'intéresse au rôle de la bioturbation dans la diagenèse précoce des sédiments d'eau douce, et en particulier à l'influence de la diversité des transports biologiques particulaires et dissous. Pour élucider les interactions complexes entre les transports biologiques et la transformation de la matière, des modèles de transport-réactions ont été développés, tenant compte de la diversité des bio-transports. Un premier travail sur un sédiment expérimental a été réalisé pour comprendre l'influence du transport par les oligochètes tubificidés sur le devenir du cadmium. Ensuite, le cas plus complexe de la minéralisation de la matière organique dans la retenue de Malause (confluence du Tarn et de la Garonne, Sud Ouest, France) a été traité. Les mesures de bioturbation par la communauté benthique montrent une diversité de bio-transports peu souvent prise en compte. Issu de ces résultats, un modèle de diagenèse précoce de la matière organique a été développé, incluant pour la première fois des bio-transports particulaires nonlocaux. Enfin, dans une dernière partie, une extension des modèles de bioturbation est présentée afin de représenter l'effet d'une distribution en patch des organismesThis study deals with the role of bioturbation in the early diagenesis of freshwater sediments, particularly the effects of the diversity of the biological transports. To understand the complex interactions between the bio-transports and the reactions of matter transformation, some models of reactive transport were developed including the bio-transport diversity. In a first chapter, cadmium transport by oligochætes tubificids was modelled using an existing dataset. Then, the more complex case of the organic matter mineralization in the Malause reservoir (West South of France) has been addressed. Bioturbation by the natural benthic community was measured. A model of early diagenesis of organic matter was developed including this bioturbation, and particularly the non-local transports. Finally, an extension of bioturbation models is proposed in the last chapter, to account for the effects of the patchiness in the distribution of bioturbators
6
Josefsson, Sarah. "Fate and transport of POPs in the aquatic environment : with focus on contaminated sediments." Doctoral thesis, Umeå universitet, Kemiska institutionen, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-42107.
Full textAbstract:
Persistent organic pollutants (POPs) are hydrophobic substances that readily sorb to organic matter in particles and colloids instead of being freely dissolved in the water phase. This sorption affects the bioavailability and environmental transport of the POPs. The major part of this thesis concerns the role of sediments as secondary sources of POPs. As the primary emissions decrease, contaminated sediments where POPs have accumulated can become the main source of contamination. If the contaminated sediment by time becomes covered with cleaner layers, the POPs are buried and no longer in contact with the aquatic environment. Experiments in this thesis showed, however, that new invading species can alter the sediment-water dynamics as a result of their bioturbation, i.e. mixing of sediment particles and pore-water. Marenzelleria spp., invading species in the Baltic Sea that burrow deeper than native species, were found to increase the remobilization of buried contaminants. The sediment-to-water flux was inversely related to the burial depth (2-10 cm) of the POP congeners (polychlorinated biphenyls (PCBs) and polybrominated diphenyl ethers) and also inversely related to the hydrophobicity of the congener. The flux was therefore most pronounced for less hydrophobic contaminants, which was linked to the bioirrigating behaviour of these species. Marenzelleria spp. also accumulated the buried POPs and increased concentrations in surface sediment. Contaminants previously considered buried at a ’safe’ depth can thus be remobilized as a result of the invasion of Marenzelleria spp. in the Baltic Sea. One method to decrease the remobilization of contaminants from sediments is ’capping’, i.e. a layer of clean material is placed as a cap on the sediment. By amending the cap with active materials, which sequester the POPs and decrease their availability, thinner layers can be used (’active capping’ or ’thin-layer capping’). Results from an experiment with thin-layer capping using different active materials (activated carbon (AC) and kraft lignin) showed that both the sediment-to-water flux and the bioaccumulation by benthic species of polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs), hexachlorobenzene (HCB) and octachlorostyrene (OCS) decreased with increased thickness of the cap layer (0.5-5 cm). Amendments with active materials further increased the cap efficiency. AC was more efficient than kraft lignin, and a 3 cm cap with 3.3% AC reduced the flux and bioaccumulation with ~90%. The reduction of the sediment-to-water flux was inversely related to the hydrophobicity of the POP, and reductions in the flux had similar magnitudes as reductions in the concentration in deep-burrowing polychaetes, demonstrating the importance of bioturbation for sediment-to-water transport. In a one-year study on the levels of PCDD/Fs, PCBs, and HCB in a coastal area of the Baltic Sea, the correlations between the POP levels and the levels of particles and organic carbon in the water were found to differ for POPs of different structure and hydrophobicity. The levels of PCDD/Fs decreased to one third in May, which could be related to the increased sedimentation, i.e. water-to-sediment transport, during spring bloom.
7
Grigg, Nicola Jane. "Benthic Bulldozers and Pumps: Laboratory and Modelling Studies of Bioturbation and Bioirrigation." Phd thesis, 2003. http://hdl.handle.net/1885/47121.
Full textAbstract:
Aquatic sediments are the recipients of a continual rain of organic debris from the water column. The decomposition reactions within the sediment and the rates of material exchange between the sediment and water column are critically moderated by the transport processes within the sediment. The sediment and solute movement induced by burrowing animals – bioturbation and bioirrigation – far exceed abiotic transport processes such as sedimentation burial and molecular diffusion. Thalassinidean shrimp are particularly abundant burrowing animals. Living in high density populations along coastlines around the world, these shrimp build complex burrow networks which they actively maintain and irrigate.¶ I used a laser scanner to map thalassinidean shrimp mound formation. These experiments measured rapid two-way exchange between the sediment and depth. Subduction from the sediment surface proved to be just as important as sediment expulsion from depth, yet this is not detected by conventional direct entrapment techniques. The experiments demonstrated that a daily sampling frequency was needed to capture the extent of the two-way exchange.¶ ...
Book chapters on the topic "Bioirrigation"
1
Khalil, Karima, Mélanie Raimonet, Anniet Laverman, and Christophe Rabouille. "Diagenetic Modeling of Organic Matter Recycling in Two Eutrophicated Estuaries: Bioirrigation Effect." In Recent Advances in Environmental Science from the Euro-Mediterranean and Surrounding Regions, 1663–64. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-70548-4_483.
Full text
2
Volkenborn, Nils, Sarah A. Woodin, David S. Wethey, and Lubos Polerecky. "Bioirrigation." In Encyclopedia of Ocean Sciences, 663–70. Elsevier, 2019. http://dx.doi.org/10.1016/b978-0-12-409548-9.09525-7.
Full textConference papers on the topic "Bioirrigation"
1
Dwyer, Ian, Darci A. Swenson, Molly Graffam, Laura M. Wehrmann, Robert C. Aller, and Nils Volkenborn. "SEASONALITY OF BIOIRRIGATION PATTERNS AND ASSOCIATED OXYGEN DYNAMICS IN PERMEABLE MARINE SEDIMENTS." In Northeastern Section - 57th Annual Meeting - 2022. Geological Society of America, 2022. http://dx.doi.org/10.1130/abs/2022ne-374940.
Full text
2
Rooze, Jurjen. "THE EFFECT OF BIOIRRIGATION AND REDOX CONDITIONS ON NITROGEN ISOTOPE FLUXES IN MARINE SEDIMENT." In 65th Annual Southeastern GSA Section Meeting. Geological Society of America, 2016. http://dx.doi.org/10.1130/abs/2016se-273447.
Full text
3
Cribb, Alison, Sebastiaan J. van de Velde, Simon Darroch, David Bottjer, and Frank Corsetti. "ENGINEERING BENTHIC BIOGEOCHEMISTRY: REACTIVE-TRANSPORT MODELING OF BIOMIXING AND BIOIRRIGATION BEHAVIORS ACROSS THE EDIACARAN-CAMBRIAN BOUNDARY." In GSA 2020 Connects Online. Geological Society of America, 2020. http://dx.doi.org/10.1130/abs/2020am-355065.
Full text
4
Choquel, Constance, Emmanuelle Geslin, Emmanuelle Geslin, Edouard Metzger, Edouard Metzger, Helena Filipsson, Helena Filipsson, et al. "LARGE CONTRIBUTION OF BENTHIC FORAMINIFERAL AND MACROFAUNAL BIOIRRIGATION TO COUPLING BETWEEN NITROGEN AND MANGANESE CYCLES IN A FJORD ENVIRONMENT." In GSA Connects 2021 in Portland, Oregon. Geological Society of America, 2021. http://dx.doi.org/10.1130/abs/2021am-367670.
Full text
5
Voloshchuk, Ekaterina, Ekaterina Voloshchuk, Tatjana Eremina, Tatjana Eremina, Alexey Isaev, and Alexey Isaev. "ASSESSMENT OF BIOTURBATION ACTIVITY OF MARENZELLERIA SPP. IN THE EASTERN PART OF THE GULF OF FINLAND." In Managing risks to coastal regions and communities in a changing world. Academus Publishing, 2017. http://dx.doi.org/10.31519/conferencearticle_5b1b947157de15.59935353.
Full textAbstract:
Macrofauna is supposed to influence on physic-chemical characteristics of the sea bottom sediments. Through its bioturbation mechanism porosity, area of oxygenated layer and oxygen penetration depth have increased. This lead to alterations in nutrient cycling as well as improvement in redox conditions which define direction of fluxes in the sediments. In oxic conditions phosphorus is transformed into particulate form and thus, its retention and burial increase. In contrary, denitrification is getting weaker and nitrogen returns into the water. The impact of benthic organisms bioirrigation activity on other chemical components in solid sediments is not sufficiently studied. Present investigations were carried out for the most abundant benthic species in the Gulf of Finland Marenzelleria spp. Those polychaetes are active turbators and their irrigation effect lead to significant changes in chemical compounds in the solid sediment. On the basis of statistical analysis of data on vertical distribution of organic carbon content, total iron and manganese in solid sediments and abundance of Marenzelleria spp. there was found that polychaetes have a significant impact on organic carbon content, while for total iron and manganese such regularity is not revealed.
6
Voloshchuk, Ekaterina, Ekaterina Voloshchuk, Tatjana Eremina, Tatjana Eremina, Alexey Isaev, and Alexey Isaev. "ASSESSMENT OF BIOTURBATION ACTIVITY OF MARENZELLERIA SPP. IN THE EASTERN PART OF THE GULF OF FINLAND." In Managing risks to coastal regions and communities in a changing world. Academus Publishing, 2017. http://dx.doi.org/10.21610/conferencearticle_58b43155f0cfe.
Full textAbstract:
Macrofauna is supposed to influence on physic-chemical characteristics of the sea bottom sediments. Through its bioturbation mechanism porosity, area of oxygenated layer and oxygen penetration depth have increased. This lead to alterations in nutrient cycling as well as improvement in redox conditions which define direction of fluxes in the sediments. In oxic conditions phosphorus is transformed into particulate form and thus, its retention and burial increase. In contrary, denitrification is getting weaker and nitrogen returns into the water. The impact of benthic organisms bioirrigation activity on other chemical components in solid sediments is not sufficiently studied. Present investigations were carried out for the most abundant benthic species in the Gulf of Finland Marenzelleria spp. Those polychaetes are active turbators and their irrigation effect lead to significant changes in chemical compounds in the solid sediment. On the basis of statistical analysis of data on vertical distribution of organic carbon content, total iron and manganese in solid sediments and abundance of Marenzelleria spp. there was found that polychaetes have a significant impact on organic carbon content, while for total iron and manganese such regularity is not revealed.