Effects of trophic status, water level, and temperature on shallow lake metabolism and metabolic balance: A standardized pan-European mesocosm experiment

Autor: Erik Jeppesen, Priit Zingel, Michal Šorf, Ulrike Scharfenberger, Rita Adrian, David G. Angeler, Arvo Tuvikene, Aldoushy Mahdy, Ayşe İdil Çakıroğlu, Eva Papastergiadou, Konstantinos Stefanidis, Martin Søndergaard, Meryem Beklioglu, Stina Drakare, Josef Hejzlar
Přispěvatelé: Centre for Limnology. Institute of Agricultural and Environmental Sciences
Rok vydání: 2019
Předmět:
Zdroj: Scharfenberger, U, Jeppesen, E, Beklioğlu, M, Søndergaard, M, Angeler, D G, Cakiroglu, A I, Drakare, S, Hejzlar, J, Mahdy, A, Papastergiadou, E, Sorf, M, Stefanidis, K, Tuvikene, A, Zingel, P & Adrian, R 2019, ' Effects of trophic status, water level, and temperature on shallow lake metabolism and metabolic balance : A standardized pan-European mesocosm experiment ', Limnology and Oceanography, vol. 64, no. 2, pp. 616-631 . https://doi.org/10.1002/lno.11064
Limnology and Oceanography
Limnology and oceanography, 64(2):616-631
DOI: 10.1002/lno.11064
Popis: Important drivers of gross primary production (GPP) and ecosystem respiration (ER) in lakes are temperature, nutrients, and light availability, which are predicted to be affected by climate change. Little is known about how these three factors jointly influence shallow lakes metabolism and metabolic status as net heterotrophic or autotrophic. We conducted a pan-European standardized mesocosm experiment covering a temperature gradi- ent from Sweden to Greece to test the differential temperature sensitivity of GPP and ER at two nutrient levels (mesotrophic or eutrophic) crossed with two water levels (1 m and 2 m) to simulate different light regimes. The findings from our experiment were compared with predictions made according the metabolic theory of ecology (MTE). GPP and ER were significantly higher in eutrophic mesocosms than in mesotrophic ones, and in shallow mesocosms compared to deep ones, while nutrient status and depth did not interact. The estimated temperature gains for ER of ~ 0.62 eV were comparable with those predicted by MTE. Temperature sensitivity for GPP was slightly higher than expected ~ 0.54 eV, but when corrected for daylight length, it was more consistent with predictions from MTE ~ 0.31 eV. The threshold temperature for the switch from autotrophy to heterotrophy was lower under mesotrophic (~ 11 C) than eutrophic conditions (~ 20 C). Therefore, despite a lack of signifi- cant temperature-treatment interactions in driving metabolism, the mesocosm’s nutrient level proved to be cru- cial for how much warming a system can tolerate before it switches from net autotrophy to net heterotrophy. We thank the technical staff at the various experimental sites for their support. We thank Alena S. Gesell, Deniz Özkundakci, Jan-Hendrik Schlei- mer, Silke Schmidt, Torsten Seltmann, and Tom Shatwell for their helpful discussions during the preparation of this manuscript. We thank Anne Mette Poulsen, Adam Wilkins, and Michael Thayne for their valuable edit- ing of the manuscript. We are also grateful to reviewers for their valuable comments on the manuscript. This study was supported by FP-7 REFRESH (Adaptive strategies to Mitigate the Impacts of Climate Change on European Freshwater Ecosystems, Contract No. 244121) and the MARS project (Managing Aquatic ecosystems and water Resources under multi- ple Stress), funded under the 7th EU Framework Programme, Theme 6 (Environment including Climate Change), Contract No. 603378 (http:// www.mars-project.eu), TUBITAK- ÇAYDAG (projects No. 105Y332 and 110Y125), the Middle East Technical University (METU)-BAP program of Turkey. EJ was further supported by AU Centre for Water Technology and A_lÇ was also supported by TUBITAK (project 296 Nos. 105Y332 and 110Y125). We thank the technical staff at the various experimental sites for their support. We thank Alena S. Gesell, Deniz Özkundakci, Jan-Hendrik Schlei- mer, Silke Schmidt, Torsten Seltmann, and Tom Shatwell for their helpful discussions during the preparation of this manuscript. We thank Anne Mette Poulsen, Adam Wilkins, and Michael Thayne for their valuable edit- ing of the manuscript. We are also grateful to reviewers for their valuable comments on the manuscript. This study was supported by FP-7 REFRESH (Adaptive strategies to Mitigate the Impacts of Climate Change on European Freshwater Ecosystems, Contract No. 244121) and the MARS project (Managing Aquatic ecosystems and water Resources under multi- ple Stress), funded under the 7th EU Framework Programme, Theme 6 (Environment including Climate Change), Contract No. 603378 (http:// www.mars-project.eu), TUBITAK- ÇAYDAG (projects No. 105Y332 and 110Y125), the Middle East Technical University (METU)-BAP program of Turkey. EJ was further supported by AU Centre for Water Technology and A_lÇ was also supported by TUBITAK (project 296 Nos. 105Y332 and 110Y125).
Databáze: OpenAIRE
Externí odkaz: