The dynamics of dissolved oxygen and metabolic rates in a shallow subtropical urban lake, Louisiana, USA

Document Type

Conference Proceeding

Publication Date

1-1-2013

Abstract

Ecosystem metabolism is an important indicator of biological activities in the context of enhanced nutrient fluxes to freshwater. In this study, we assessed both the gross and net primary production, and respiration of a shallow subtropical lake that is influenced by a highly developed urban environment. A realtime water quality monitoring platform with multi-parameter probes was deployed in the centre of the lake to record changes in dissolved oxygen (DO) concentration and other water quality parameters at 15-minute intervals from July 2008 to July 2009. The measurements were used to quantify lake productivity with a single station did oxygen change method. The data suggested a mean annual gross primary productivity of 4.41 g O2 m-1 d -1, a mean annual net primary production of 2.13 g O2 m-2 d-1, and a mean annual respiration of 5.90 g O 2 m-2 d-1. Annually, a total of 1610 g O 2 m-2 were produced compared with a respiratory consumption of 2150 g O2 m-2. Monthly respiration rates were equal to, or greater than, monthly productivity rates during the monitored year, suggesting that this shallow subtropical urban lake was heterotrophic in net terms throughout most of the year. Copyright © 2013 IAHS Press.

Publication Source (Journal or Book title)

IAHS-AISH Proceedings and Reports

First Page

212

Last Page

219

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