Home Page | Help | Contact | Log In | Search

Navigation

Presenters Notified: November 2012

Program Schedule Posted:November 2012

Abstracts Available: January 2013

Meeting:
17-22 February 2013

Viviani, D. A., University of Hawai'i at Manoa, USA, viviani@hawaii.edu
Church, M. J., University of Hawai'i at Manoa, USA, mjchurch@hawaii.edu
Böttjer, D., University of Hawai'i at Manoa, USA, dbottjer@hawaii.edu

VARIABILITY IN DISSOLVED PRIMARY PRODUCTION AND MICROBIAL GROWTH IN THE NORTH PACIFIC SUBTROPICAL GYRE

Oceans are estimated to be responsible for up to half of global net primary production. Among the most common methods of measuring oceanic primary production is via assimilation of 14C labeled bicarbonate by phytoplankton, however most routine 14C-based measurements only measure rates of particulate primary production, ignoring production of photosynthetically derived dissolved substrates. Measurements of dissolved carbon production are important because the partitioning of production between dissolved and particulate pools impacts the pathways of carbon cycling through marine food webs. Concurrent bacterial production measurements constrain rates of bacterial growth on dissolved organic carbon. Measurements of dissolved and particulate primary production, together with bacterial production have been conducted on near-monthly cruises to Station ALOHA (22° 45’N, 158° W) between 2010 and 2012, enabling examination of coupling between primary and heterotrophic production at this persistently oligotrophic site. The resulting measurements reveal that relative partitioning of primary production between dissolved and particulate phases varies with depth; proportionally more fixed carbon appears channeled to the dissolved phase in the dimly-lit lower euphotic zone compared to the upper euphotic zone.

Oral presentation

Session #:SS14
Date: 2/18/2013
Time: 10:45