FN Archimer Export Format PT J TI A new method to estimate planktonic oxygen metabolism using high‐frequency sensor measurements in mesocosm experiments and considering daytime and nighttime respirations BT AF Soulié, Tanguy Mas, Sébastien Parin, David Vidussi, Francesca Mostajir, Behzad AS 1:1;2:2;3:2;4:1;5:1; FF 1:;2:;3:;4:;5:; C1 MARBEC (MARine Biodiversity, Exploitation and Conservation), Univ Montpellier, CNRS, Ifremer, IRD Montpellier, France MEDIMEER (Mediterranean Platform for Marine Ecosystems Experimental Research), OSU OREME, CNRS, Univ Montpellier, IRD, IRSTEA Sète, France C2 UNIV MONTPELLIER, FRANCE CNRS, FRANCE UM MARBEC IN WOS Cotutelle UMR copubli-france IF 3.162 TC 7 UR https://archimer.ifremer.fr/doc/00686/79762/82562.pdf https://archimer.ifremer.fr/doc/00686/79762/82563.pdf LA English DT Article AB Understanding how aquatic ecosystems respond to perturbations has emerged as a crucial way to predict the future of these ecosystems and to assess their capacity to produce oxygen and store atmospheric carbon. In this context, in situ mesocosm experiments are a useful approach for simulating disturbances and observing changes in planktonic communities over time and under controlled conditions. Within mesocosm experiments, the estimation of fundamental parameters such as gross primary production (GPP), net community production (NCP), and respiration (R) allows the evaluation of planktonic metabolic responses to a perturbation. The continuous estimation of these metabolic parameters in real time and at high frequency is made possible by employing noninvasive automated sensors in the water column. However, some uncertainties and methodological questions about the estimation of daytime respiration remain to be addressed for this method, and notably to address the fact that respiration could be significantly higher during the day than during the night. In this study, data from two in situ mesocosm experiments performed in fall and spring in a coastal Mediterranean area were used to develop a new method of estimating daytime respiration, and in turn daily GPP, R, and NCP, by considering the maximum instantaneous R, and that takes into account the variability of the coupling between day–night and dissolved oxygen cycles. This new method was compared with the Winkler incubation technique and with another existing method. Results showed that using this existing method, daytime R was significantly underestimated relative to estimates obtained with the newly proposed method. PY 2021 PD MAY SO Limnology And Oceanography-methods SN 1541-5856 PU Wiley VL 19 IS 5 UT 000629240200001 BP 303 EP 316 DI 10.1002/lom3.10424 ID 79762 ER EF