Modeling aggregate dynamics of transparent exopolymer particles (TEP) and their interactions with a pelagic food web

Download
index.pdf
2017-11-06
Oguz, Temel
Show full item record
Creative Commons License
This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
155
views
105
downloads
Mechanistic understanding of the role of transparent exopolymer particles (TEP) in particular and macrogels in general on food web functioning is an overlooked aspect of ecosystem modeling. Here, I address this problem by using a 1-dimensional, vertically resolved model that integrates particle aggregation dynamics with pelagic ecosystem structure. The model first simulates the observed annual food web structure of the mesotrophic Marmara Sea ecosystem in the absence of aggregation processes. This reference structure is reduced by about 40% in the presence of aggregation webs formed by direct physical collision of detritus particles with live phytoplankton or bacterial cells. This type of aggregation model approach therefore introduces adverse effects on the overall food web structure and is more restrictive in terms of aggregate formation. The alternative aggregation web considers transforming a fraction of dissolved organic matter into particulate form by incorporating 2 TEP size classes. They coagulate with phytoplankton and bacterial cells to form live biotic aggregates (BG) and with detritus to form abiotic (AG) aggregates; additional coagulation of AG and BG particles forms macrogels. This system results in approximately 2-fold higher aggregate concentrations, which facilitates stronger particle sedimentation to the deep sea (quantified by AG concentrations) and higher food availability for macrozooplankton (quantified by BG concentrations). It also maintains the reference food web structure with only minor changes. Therefore, the present study demonstrates the feasibility of coupling food web models with a simplified TEP-based aggregation model.
Dissolved organic nitrogen, Food web model, Marmara Sea, Particle aggregation, TEP
https://hdl.handle.net/11511/63473
MARINE ECOLOGY PROGRESS SERIES
Graduate School of Marine Sciences, Article

Suggestions

Simulations of phytoplankton species and carbon production in the equatorial Pacific Ocean 2. Effects of physical and biogeochemical processes
Salihoğlu, Barış (2007-03-01)
A one-dimensional multi-component lower trophic level ecosystem model that includes detailed algal physiology is used to investigate the response of phytoplankton community and carbon production and export to variations in physical and biochemical processes in the Cold Tongue region of the equatorial Pacific Ocean at ON, 140W. Results show that high-frequency variability in vertical advection and temperature is an important mechanism driving the carbon export. Filtering out low frequency physical forcing re...
Investigation of dielectric properties of different cake formulations during microwave and infrared-microwave combination baking
Sakiyan, Ozge; Şümnü, Servet Gülüm; Sahin, Serpil; Meda, Venkatesh (Wiley, 2007-05-01)
Dielectric properties can be used to understand the behavior of food materials during microwave processing. Dielectric properties influence the level of interaction between food and high frequency electromagnetic energy. Dielectric properties are, therefore, important in the design of foods intended for microwave preparation. In this study, it was aimed to determine the variation of dielectric properties of different cake formulations during baking in microwave and infrared-microwave combination oven. In ad...
Prediction of Protein Interactions by Structural Matching: Prediction of PPI Networks and the Effects of Mutations on PPIs that Combines Sequence and Structural Information
Tunçbağ, Nurcan; Nussinov, Ruth; Gursoy, Attila (Humana Press Inc., 2017)
Structural details of protein interactions are invaluable to the understanding of cellular processes. However, the identification of interactions at atomic resolution is a continuing challenge in the systems biology era. Although the number of structurally resolved complexes in the Protein Databank increases exponentially, the complexes only cover a small portion of the known structural interactome. In this chapter, we review the PRISM system that is a protein–protein interaction (PPI) prediction tool—its r...
Prediction of protein subcellular localization based on primary sequence data
Özarar, Mert; Atalay, Mehmet Volkan; Department of Computer Engineering (2003)
Subcellular localization is crucial for determining the functions of proteins. A system called prediction of protein subcellular localization (P2SL) that predicts the subcellular localization of proteins in eukaryotic organisms based on the amino acid content of primary sequences using amino acid order is designed. The approach for prediction is to nd the most frequent motifs for each protein in a given class based on clustering via self organizing maps and then to use these most frequent motifs as features...
Development of acyl anion precursors and their applications
Reis, Ömer; Demir, Ayhan Sıtkı; Department of Chemistry (2005)
This thesis presents the development of new acyl anion precursors and their applications. The main concern of this thesis was to make use of acyl anion precursors in catalytic bond forming reactions. Toward this aim, previously known cyanide ion catalyzed cleavage of benzils was investigated in scope and efficiency in unsymmetrical benzoin condensation. Although benzils were proved to be useful entities as acyl anion precursors in benzoin condensation, they suffer some major drawbacks. Therefore acylphospho...
Citation Formats
T. Oguz, “Modeling aggregate dynamics of transparent exopolymer particles (TEP) and their interactions with a pelagic food web,” MARINE ECOLOGY PROGRESS SERIES, pp. 15–31, 2017, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/63473.
METU IIS - Integrated Information Service open@metu.edu.tr