Ann. Limnol. - Int. J. Lim.
Volume 47, Number 3, 2011
|Page(s)||251 - 257|
|Published online||09 August 2011|
Does different versus equal daytime and night-time respiration matter for quantification of lake metabolism using diel dissolved oxygen cycles?
Department of Environmental Engineering, Faculty of Engineering and Architecture, Abant Izzet Baysal University, Bolu, Turkey
* Corresponding author: firstname.lastname@example.org
Accepted: 10 April 2011
Diel dissolved oxygen (DO) measurements can be used to estimate water metabolism of aquatic systems, in particular, lakes, lagoons and streams in terms of gross primary production (GPP), ecosystem respiration (Reco) and net ecosystem production (NEP). One of the main assumptions in the calculation of lake metabolism is that Reco is the same for daytime (Rdaytime) and nighttime (Rdarkhr). This study aimed at testing the equal Rdaytime and Rdarkhr assumption to estimate GPP, Reco and NEP in a littoral zone of a temperate shallow lake (Lake Yeniçağa) in northwestern Turkey with and without the assumption. Based on the equal Rdarkhr and Rdaytime assumption, values calculated for GPP and Rdaytime were different than those based on the different Rdarkhr and Rdaytime assumption (P<0.001). GPP was lower by 7.5% in July, 49.6% in September and 14.9% in October, while Reco was lower by 5.9% in July and 55.8% in September. GPP was higher by 8.9% in August and 55% in November, while Reco was higher by 7.8% in August and 23.9% in November.
Key words: Aquatic ecosystems / diel dissolved oxygen / ecosystem respiration / lake metabolism / shallow lake
© EDP Sciences, 2011
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