Publication Details

Category Text Publication
Reference Category Journals
DOI 10.4319/lo.2012.57.1.0199
Title (Primary) Incorporation of nitrogen from N2 fixation into amino acids of zooplankton
Author Loick-Wilde, N.; Dutz, J.; Miltner, A. ORCID logo ; Gehre, M.; Montoya, J.P.; Voss, M.
Source Titel Limnology and Oceanography
Year 2012
Department ISOBIO; UBT
Volume 57
Issue 1
Page From 199
Page To 210
Language englisch

Eurytemora affinis (Copepoda) were fed 15N-labeled Rhodomonas salina (Cryptophyta) or 15N-labeled Nodularia spumigena (Cyanobacteria) in excess under controlled laboratory conditions. Zooplankton collected from the Baltic Sea were fed natural phytoplankton amended with 15N-labeled N. spumigena. We quantified the direct incorporation of 15N tracer from N2-fixing N. spumigena (diazotroph nitrogen) and ammonium-utilizing R. salina into the amino acid nitrogen (AA-N) of zooplankton using complementary gas chromatography-combustion-isotope ratio mass spectrometry, gas chromatography-mass spectrometry, and elemental analysis-isotope ratio mass spectrometry approaches. Specific and mass-specific TN and AA-N incorporation rates of the 15N tracers were calculated for zooplankton. Highest incorporation of 15N was found in field zooplankton relying on N. spumigena and in E. affinis relying on R. salina. Lowest incorporation was found in E. affinis relying on N. spumigena. Decreasing specific and mass-specific rates during field experiments possibly were due to food shortage, whereas decreasing rates in E. affinis grazing on R. salina were more likely due to satiation. Specific and mass-specific rates were consistently low in E. affinis when exposed to N. spumigena, suggesting that these animals were reluctant to feed on N. spumigena. Essential isoleucine received most of the diazotroph nitrogen in field zooplankton, while nonessential amino acids received most 15N tracer in E. affinis. N. spumigena was clearly an important amino acid nitrogen source for Baltic Sea zooplankton.
Persistent UFZ Identifier
Loick-Wilde, N., Dutz, J., Miltner, A., Gehre, M., Montoya, J.P., Voss, M. (2012):
Incorporation of nitrogen from N2 fixation into amino acids of zooplankton
Limnol. Oceanogr. 57 (1), 199 - 210 10.4319/lo.2012.57.1.0199