Balıkçılığın deniz biyojeokimyası üzerindeki etkisinin ekosistem modellemesi yöntemiyle incelenmesi

2016-06-03
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
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.