Program and Agenda

Abstract

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.

ePoster:

Authors

Martinez-Garcia, S., University of Hawaii/C-MORE, USA, sandramg@hawaii.edu

Karl, D. M., University of Hawaii/C-MORE, USA, dkarl@hawaii.edu

Details

Poster presentation

Session #:049
Date: 2/27/2014
Time: 16:00 - 18:00
Location: Poster/Exhibit Hall

Presentation is given by student: No

PosterID: 2438