Program and Agenda

Abstract

DISSOLVED ORGANIC MATTER PRODUCTION AND MICROBIAL GROWTH AT STATION ALOHA

Oceans are estimated to be responsible for up to half of global primary production. Much of our understanding of temporal variability in ocean biogeochemical cycling comes from ongoing time-series observations, including the Hawaii Ocean Time-series (HOT). Twenty-five years of carbon fixation measurements, assessed by 14C bicarbonate assimilation, have provided improved understanding of carbon cycling in the North Pacific Subtropical Gyre. This presentation will describe 5 years of near-monthly measurements of rates of particulate and dissolved primary production at this time-series site, providing new insight into seasonal variability associated with primary production. Over the time series, dissolved productivity averaged approximately 25% of total (dissolved+particulate) production. Despite a well-resolved seasonal pattern in particulate production, dissolved productivity did not demonstrate the same seasonality. Coincident measurements of heterotrophic bacterial production suggested that bacterial production did not temporally co-vary with changes in primary production. These results highlight the complexity of processes likely contributing to production and consumption of dissolved organic matter in this habitat.

ePoster:

Authors

Viviani, D. A., University of Hawaii at Manoa, USA, viviani@hawaii.edu

Church, M. J., University of Hawaii at Manoa, USA, mjchurch@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: Yes

PosterID: 2460