Program and Agenda

Abstract

IMPACT OF CHANGES IN DISSOLVED NUTRIENTS IN THE EASTERN TROPICAL NORTH ATLANTIC: THE ZOOPLANKTON RESPONSE

To explore differential effects of nitrogen and phosphorus inventories on the pelagic community of the Eastern Tropical North Atlantic, we conducted a shipboard nutrient manipulation experiment with natural surface plankton off Senegal. Triplicates of 150L mesocosms were adjusted to four N:P levels ranging from 2.8 to 16, with initial addition of either N only (16), P only (2.8), both N and P (8) or none (5.5, ambient conditions), and observed over a time period of 11 days. PON:POP in the phytoplankton bloom followed initial N:P, and in turn affected the N:P excretion ratio of a herbivorous calanoid copepod, Undinula vulgaris, incubated with the respective mesocosm community as prey. We did not observe significant differences in nutritional condition (RNA:DNA ratio) in this copepod between treatments. However, the final abundance of mesozooplankton was influenced by the initial N:P, with the cladoceran Penilia avirostris abundance increasing with N:P, while cyclopoid and harpacticoid copepods were most abundant in those mesocosms receiving no nutrient addition.

ePoster:

Authors

Hauss, H., GEOMAR, Germany, hhauss@geomar.de

Franz, J., GEOMAR, Germany, jfranz@geomar.de

Riebesell, U., GEOMAR, Germany

Sommer, U., Germany

Details

Poster presentation

Session #:008
Date: 2/25/2014
Time: 16:00 - 18:00
Location: Poster/Exhibit Hall

Presentation is given by student: No

PosterID: 2036