Program and Agenda

Abstract

PICOPHYTOPLANKTON POPULATION ABUNDANCES AND GROWTH DYNAMICS DURING SUMMER 2010 IN THE COSTA RICA DOME AREA OF THE EASTERN PACIFIC

Picophytoplankton (PPP) are responsible for a large percentage of the primary production in the global oceans. The Costa Rica Dome, an upwelling feature off the coast of central America, is known to have high abundances of Synechococcus (SYN), one of the PPP taxa distinguishable using flow cytometry. During summer 2010, we found that picoeukaryotes (PEUK), a group that includes many genera, were also present at elevated concentrations (~5-10 times higher) relative to other open ocean areas. PPP abundance maxima were not co-located: PEUK maxima typically occurred along the pycnocline, whereas SYN abundance was highest at the surface. Growth rates for these populations as determined by seawater dilution experiments were highest in the upwelled dome waters, whereas microzooplankton grazing increased as this water moved away from the dome. Nevertheless, SYN and PEUK positive net growth rates were observed in the upper water column throughout the area, suggesting that they were able to escape microzooplankton grazer control, perhaps a factor in explaining their higher standing stocks. We will discuss these trends in relation to measured physical and chemical parameters.

ePoster:

Authors

Selph, K. E., University of Hawaii at Manoa, USA, selph@hawaii.edu

Landry, M. R., Scripps Institution of Oceanography, University of California San Diego, USA, mlandry@ucsd.edu

Taylor, A. G., Scripps Institution of Oceanograhy, University of California San Diego, USA, agtaylor@ucsd.edu

Gutiérrez-Rodríguez, A., Station Biologique de Roscoff, France, ang008@mail.ucsd.edu

Taniguchi, D. A., Scripps Institution of Oceanograhy, University of California San Diego, USA, datanigu@ucsd.edu

Details

Poster presentation

Session #:127
Date: 2/24/2014
Time: 16:00 - 18:00
Location: Poster/Exhibit Hall

Presentation is given by student: No

PosterID: 3246