EUPHOTIC AND MESOPELAGIC ZONE MICROBIAL RESPIRATION AT STATION ALOHA
Temporal and vertical variability of total microbial community respiration was measured at Station ALOHA on approximately monthly intervals for a period of 1-year. Microbial respiration was derived from in vivo electron transport system (ETS) activity measurements. Euphotic zone (0-200 m) depth-integrated community respiration averaged 135.3±8.8 mmol O2 m-2 d-1 with maximum values in summer and minima in winter (146.8±9.9 and 112.2±6.2 mmol O2 m-2 d-1, respectively). The volumetric rates of respiration decreased significantly below the euphotic zone. Mesopelagic zone (200-1000 m) depth-integrated community respiration was on average 52.7±2.1 mmol O2 m-2 d-1, and again was higher in summer than in winter (54.3±3.4 and 46.5±2.2 mmol O2 m-2 d-1, respectively). We also measured shorter-term variability in microbial respiration in the euphotic zone during a 17-day period. Daily variations were 2-58% of the mean value for the entire period. Our results indicate: 1) important short term variability of euphotic microbial respiration ; 2) clear seasonality of microbial respiration rates in both the euphotic and mesopelagic zones and 3) mesopelagic microbial respiration is approximately 40% the rates found in the photic layer.
Martinez-Garcia, S., University of Hawaii/C-MORE, USA, firstname.lastname@example.org
Karl, D. M., University of Hawaii/C-MORE, USA, email@example.com
Time: 16:00 - 18:00
Location: Poster/Exhibit Hall
Presentation is given by student: No