Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12779/6241
Title: Planktonic community metabolism in two stratified Mediterranean reservoirs with different trophic status
Authors: Romero Martínez, Leonardo
María Morales, Pineda
Bárbara, Úbeda
Loiselle, Steven Arthur 
Andrés, Cózar
José A., Gálvez
Issue Date: 2013
Project: None 
Journal: AQUATIC ECOSYSTEM HEALTH & MANAGEMENT
Abstract: 
Community metabolism plays a crucial role in the carbon dynamics of continental aquatic ecosystems. In the present work, two Mediterranean reservoirs (Southern Spain) with different trophic status were monitored during the stratified phase over two consecutive years (2009 and 2010) to evaluate community metabolic dynamics and potential controlling factors. Dark and light incubations were performed in order to estimate the daily rates of gross production (GP), community respiration (CR) and net community production (NCP). Temperature, irradiance, chlorophyll, phosphorus and carbon concentration were also measured at different depths within the mixed layer. On average, results showed heterotrophic behavior (GP < CR) in both reservoirs, which was particularly evident in the more eutrophic reservoir. Interannual climate variability was high due to the exceptionally rainy winter of 2010. This resulted in significant increases in CR in both reservoirs, indicating a more heterotrophic behavior. A decrease NCP was especially evident in the most eutrophic reservoir where a decrease of autotrophic biomass occurred. In general, NCP was found to be directly related to the ratio between the euphotic layer depth and the mixed layer depth, and inversely related to the particulate phosphorus concentration. Autotrophic behavior was only found in conditions of high irradiance (mixed layer shallower than euphotic layer), relatively low concentrations of dissolved organic carbon (< 6 mg L-1) and particulate phosphorus (< 10 µg L-1), and moderate chlorophyll concentration (2 - 9 µg L-1), albeit these conditions did not always lead to a net autotrophic balance.
Description: 
63025
URI: http://hdl.handle.net/20.500.12779/6241
ISSN: 1463-4988
Appears in Collections:Publications

Show full item record

Google ScholarTM

Check


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.