Balıkçılığın deniz biyojeokimyası üzerindeki etkisinin ekosistem modellemesi yöntemiyle incelenmesi

Date

2016-06-03

Author

Dişa, Deniz
Akoğlu, Ekin
Salihoğlu, Barış

Metadata

Show full item record

Item Usage Stats

218
views

0
downloads

Marine ecosystems are responsible for storing the carbon within the ocean body by means of uptaking atmospheric carbon into the ocean, transforming it into organic carbon through photosynthesis and transporting to the profound depths of the ocean. Playing a significant role in the marine food webs, fish has a notable impact on carbon export from the surface to the bottom of the ocean. For this reason, mainly due to its increasing trend since 1950s, fishing is expected to impact carbon cycle directly by changing the fish biomasses. However how fish impacts the biogeochemistry of marine ecosystems is not known clearly.The aim of this study is to analyse the impact of fish on marine biogeochemical processes by setting up an end-to-end model that simulates lower and higher tropic levels of marine ecosystems. For this purpose, a biogeochemical model which simulates lower tropic level dynamics (e.g. carbon export, nutrient cycles) and an ecosystem model which simulates fisheries and higher tropic level dynamics (e.g. food web) were online and two-way coupled. Simulating the ecosystem from one end to the other with a holistic approach, the coupled model provided a more realistic representation of the ecosystem. It served as a tool for the analysis of fishing impacts on marine biogeochemical dynamics.Simulation results obtained by the coupled model by applying different fishing intensities indicated that fishery directly influences the nutrient cycles. As a result of this study, unlike the models that donot explicitly represent the fish, how marine biogeochemisty is impacted by fish assemblages was delineated

Subject Keywords

Carbon export, End-to-end modelin, Fishery, Marine biogeochemistry, Ecological modeling, Balıkçılık, Biyojeokimya, Ekosistem modellemesi, Karbon taşınımı, Sondan sona modelleme

URI

https://hdl.handle.net/11511/86955

Conference Name

Türkiye Deniz Bilimleri Konferansı , 31 Mayıs - 03 Haziran 2016

Collections

Graduate School of Marine Sciences, Conference / Seminar

Suggestions

OpenMETU
Core

Influence of Farming Intensity and Climate on Lowland Stream Nitrogen Goyenola, Guillermo; Graeber, Daniel; Meerhof, Mariana; Jeppesen, Erik; Teixeira-de Mello, Franco; Vidal, Nicolás; Fosalba, Claudia; Ovesen, Niels Bering; Gelbrecht, Joerg; Mazzeo, Néstor; Kronvang, Brian (MDPI AG, 2020-4-2) Nitrogen lost from agriculture has altered the geochemistry of the biosphere, with pronounced impacts on aquatic ecosystems. We aim to elucidate the patterns and driving factors behind the N fluxes in lowland stream ecosystems differing about land-use and climatic-hydrological conditions. The climate-hydrology areas represented humid cold temperate/stable discharge conditions, and humid subtropical climate/flashy conditions. Three complementary monitoring sampling characteristics were selected, including a ...
Effects of Nutrient Management Scenarios on Marine Food Webs: A Pan-European Assessment in Support of the Marine Strategy Framework Directive Piroddi, Chiara; et. al. (2021-03-01) Eutrophication is one of the most important anthropogenic pressures impacting coastal seas. In Europe, several legislations and management measures have been implemented to halt nutrient overloading in marine ecosystems. This study evaluates the impact of freshwater nutrient control measures on higher trophic levels (HTL) in European marine ecosystems following descriptors and criteria as defined by the Marine Strategy Framework Directive (MSFD). We used a novel pan-European marine modeling ensemble of four...
Impacts of atmospheric nutrient deposition on marine productivity: Roles of nitrogen, phosphorus, and iron Okin, Gregory S.; Baker, Alex R.; Tegen, Ina; Mahowald, Natalie M.; Dentener, Frank J.; Duce, Robert A.; Galloway, James N.; Hunter, Keith; Kanakidou, Maria; Kubilay, Nilgun; Prospero, Joseph M.; Sarin, Manmohan; Surapipith, Vanisa; Uematsu, Mitsuo; Zhu, Tong (American Geophysical Union (AGU), 2011-06-23) Nutrients are supplied to the mixed layer of the open ocean by either atmospheric deposition or mixing from deeper waters, and these nutrients drive nitrogen and carbon fixation. To evaluate the importance of atmospheric deposition, we estimate marine nitrogen and carbon fixation from present-day simulations of atmospheric deposition of nitrogen, phosphorus, and iron. These are compared with observed rates of marine nitrogen and carbon fixation. We find that Fe deposition is more important than P deposition...
Impacts of anthropogenic SOx, NOx and NH3 on acidification of coastal waters and shipping lanes Hunter, Keith A.; Liss, Peter S.; Surapipith, Vanisa; Dentener, Frank; Duce, Robert; Kanakidou, Maria; Kubilay, Nilgun; Mahowald, Natalie; Okin, Greg; Sarin, Manmohan; Uematsu, Mitsuo; Zhu, Tong (2011-07-07) The acidification of the ocean by anthropogenic CO2 absorbed from the atmosphere is now well-recognized and is considered to have lowered surface ocean pH by 0.1 since the mid-18th century. Future acidification may lead to undersaturation of CaCO3 making growth of calcifying organisms difficult. However, other anthropogenic gases also have the potential to alter ocean pH and CO2 chemistry, specifically SOx and NOx and NH3. We demonstrate using a simple chemical model that in coastal water regions with high ...
MODELING THE IMPACT OF FISH AND FISHERIES ON MARINE BIOGEOCHEMISTRY: A CASE STUDY IN THE SARGASSO SEA Dişa, Deniz; Salihoğlu, Barış; Akoğlu, Ekin; Department of Oceanography (2016-9-23) The ocean has a crucial role in global carbon cycle. Marine ecosystems are responsible for storing the carbon within the ocean body by means of uptaking atmospheric carbon into the ocean, transforming it into organic carbon through photosynthesis and transporting to the profound depths of the ocean. Playing a significant role in the marine food webs, grazing on plankton and providing nutrient to ecosystem by its metabolic activities, fish is thought to have a considerable impact on carbon export. For this r...

Citation Formats

D. Dişa, E. Akoğlu, and B. Salihoğlu, “Balıkçılığın deniz biyojeokimyası üzerindeki etkisinin ekosistem modellemesi yöntemiyle incelenmesi,” presented at the Türkiye Deniz Bilimleri Konferansı , 31 Mayıs - 03 Haziran 2016, 2016, Accessed: 00, 2021. [Online]. Available: https://hdl.handle.net/11511/86955.