Details zur Publikation

Referenztyp Zeitschriften
DOI / URL Link
Titel (primär) High cell-specific rates of nitrogen and carbon fixation by the cyanobacterium Aphanizomenon sp. at low temperatures in the Baltic Sea
Autor Svedén, J.B.; Adam, B.; Walve, J.; Nahar, N.; Musat, N.; Lavik, G.; Whitehouse, M.J.; Kuypers, M.M.M.; Ploug, H.;
Journal / Serie FEMS Microbiology Ecology
Erscheinungsjahr 2015
Department ISOBIO;
Band/Volume 91
Heft 12
Sprache englisch;
POF III (gesamt) T41;
Supplements https://oup.silverchair-cdn.com/oup/backfile/Content_public/Journal/femsec/91/12/10.1093_femsec_fiv131/5/fiv131_Supplementary_Data.zip?Expires=1586772613&Signature=oEZKJZosPN6U3V-9NX7AaDPHvlqPp8Rf~Q3hvLUvaSI-0K4~J01HHLabDZHB71uBaaIbg14cYyOkQcW4Awuv1Ak6izKjjgNd6~qgvQfwqOdLTukUExn62oAXpz4FvhAmnpibHg93DeoOCzNTZf2qcYA6eCLE8OYTbAR0S413SgPkUF1dXgGtRx0hZxA6jmc9FE7GBjjHXphLvZKyUuA16yAl5c4bTbGT3TSEnAW2sQRY1fzTMxlOSm-u52M8CZBSuGtLTTAd57oNDM71R68h7Kx9dFi2NP-u8IY8vbK25k3S8vFgcFQ6aOkExv7mDXJJXXj4L8RDFeQgnqJI~ZyNPw__&Key-Pair-Id=APKAIE5G5CRDK6RD3PGA
Keywords Aphanizomenon; SIMS; isotopes; O2-microsensors; C-fixation; N2-fixation
UFZ Querschnittsthemen RU3;
Abstract Aphanizomenon is a widespread genus of nitrogen (N2)-fixing cyanobacteria in lakes and estuaries, accounting for a large fraction of the summer N2-fixation in the Baltic Sea. However, information about its cell-specific carbon (C)- and N2-fixation rates in the early growth season has not previously been reported. We combined various methods to study N2-fixation, photosynthesis and respiration in field-sampled Baltic Sea Aphanizomenon sp. during early summer at 10°C. Stable isotope incubations at in situ light intensities during 24 h combined with cell-specific secondary ion mass spectrometry showed an average net N2-fixation rate of 55 fmol N cell−1 day−1. Dark net N2-fixation rates over a course of 12 h were 20% of those measured in light. C-fixation, but not N2-fixation, was inhibited by high ambient light intensities during daytime. Consequently, the C:N fixation ratio varied substantially over the diel cycle. C- and N2-fixation rates were comparable to those reported for Aphanizomenon sp. in August at 19°C, using the same methods. High respiration rates (23% of gross photosynthesis) were measured with 14C-incubations and O2-microsensors, and presumably reflect the energy needed for high N2-fixation rates. Hence, Aphanizomenon sp. is an important contributor to N2-fixation at low in situ temperatures in the early growth season.
ID 17046
dauerhafte UFZ-Verlinkung https://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=17046
Svedén, J.B., Adam, B., Walve, J., Nahar, N., Musat, N., Lavik, G., Whitehouse, M.J., Kuypers, M.M.M., Ploug, H. (2015):
High cell-specific rates of nitrogen and carbon fixation by the cyanobacterium Aphanizomenon sp. at low temperatures in the Baltic Sea
FEMS Microbiol. Ecol. 91 (12), fiv131