Date

2023-1-25

Author

Avcı, Feride

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Ponds are globally the most numerous yet neglected freshwaters because of their small size and shallowness. Ponds are important freshwater bodies as they largely contribute to aquatic biodiversity. They can also act as a sink or source of greenhouse gas (GHG) emissions, depending on their condition. Many studies show that CO2 and CH4 emissions from shallow freshwater bodies such as ponds are significant. In freshwaters, respiration produces CO2 when there is oxygen; when there is no oxygen respiration produces CH4. The lack of oxygen is usually caused by high amounts of organic matters and nutrients in the system. The research was conducted as a part of EU-H2020 funded large scale consortium project entitled PONDERFUL in 2021 summer in 15 urban ponds in Ankara. The study sites were İmrahor River Valley, Gölbaşı Düzlüğü, and Lake Mogan. There were 7 ponds sampled in İmrahor River Valley, 3 in Gölbaşı Düzlüğü, and 5 in Lake Mogan. This thesis assumed that the amount of nutrients in ponds had strong positive effect on methane emission. Analysis showed that total phosphorus and total nitrogen concentrations in the ponds had strong effect on methane emission. Methane can be vi oxidized by methane oxidizing bacteria (MOB) when the water is oxic again. Zooplankton are a crucial component of freshwater food webs. Depending on their size and feeding type, they can prey upon other zooplankton, phytoplankton, or bacteria. MOB can be grazed by zooplankton, and this would result in a decrease in methane oxidization. Thus it was predicted in the current study that zooplankton community structure in ponds has an effect on CH4 emissions through grazing on MOB. Total Cladoceran density in ponds had significant positive effect on methane ebullution from ponds probably through grazing pressure on MOB.

Subject Keywords

Pond, Greenhouse Gas, Methane Emission, Nutrients, Zooplankton

URI

https://hdl.handle.net/11511/102118

Collections

Graduate School of Natural and Applied Sciences, Thesis