FN Archimer Export Format
PT J
TI Anomalously high abundance of Crocosphaera in the South Pacific Gyre
BT 
AF Benavides, Mar
   Caffin, Mathieu
   Duhamel, Solange
   Foster, Rachel Ann
   Grosso, Olivier
   Guieu, Cécile
   Van Wambeke, France
   Bonnet, Sophie
AS 1:1;2:1;3:2;4:3;5:1;6:4,5;7:1;8:1;
FF 1:;2:;3:;4:;5:;6:;7:;8:;
C1 Aix Marseille Univ, Université de Toulon, CNRS, IRD, MIO UM 110, 13288, Marseille, France
   Lamont Doherty Earth Observatory, Columbia University, Palisades, NY 10964, USA
   Stockholm University, Department of Ecology, Environment and Plant Sciences, Stockholm, Sweden
   Sorbonne Universités, UPMC Univ Paris 06, INSU-CNRS, Laboratoire d'Océanographie de Villefranche, 181 Chemin du Lazaret, 06230 Villefranche-sur-mer, France
   Center for Prototype Climate Modeling, New York University Abu Dhabi, P.O. Box 129188, Abu Dhabi, United Arab Emirates
C2 UNIV AIX MARSEILLE, FRANCE
   UNIV COLUMBIA, USA
   UNIV STOCKHOLM, SWEDEN
   UNIV SORBONNE, FRANCE
   UNIV ABU DHABI, UNITED ARAB EMIRATES
IF 2.1
TC 4
UR https://archimer.ifremer.fr/doc/00765/87716/93261.pdf
LA English
DT Article
CR OUTPACE
BO L'Atalante
DE ;Crocosphaera;oligotrophic;diazotrophs;cyanobacteria
AB The unicellular diazotrophic cyanobacterium Crocosphaera contributes significantly to fixed nitrogen inputs in the oligotrophic ocean. In the western tropical South Pacific Ocean (WTSP), these diazotrophs abound thanks to the phosphorus-rich waters provided by the South Equatorial Current, and iron provided aeolian and subsurface volcanic activity. East of the WTSP, the South Pacific Gyre (SPG) harbors the most oligotrophic and transparent waters of the world's oceans, where only heterotrophic diazotrophs have been reported before. Here in the SPG we detected unexpected accumulation of Crocosphaera at 50 m with peak abundances of 5.26×105nifH gene copies L–1. The abundance of Crocosphaera at 50 m was in the same order of magnitude as those detected westwards in the WTSP and represented 100% of volumetric N2 fixation rates. This accumulation at 50 m was likely due to a deeper penetration of UV light in the clear waters of the SPG being detrimental for Crocosphaera growth and N2 fixation activity. Nutrient and trace metal addition experiments did not induce any significant changes in N2 fixation or Crocosphaera abundance, indicating that this population was not limited by the resources tested and could develop in high numbers despite the oligotrophic conditions. Our findings indicate that the distribution of Crocosphaera can extend into subtropical gyres and further understanding of their controlling factors is needed. 
PY 2022
PD APR
SO Fems Microbiology Letters
SN 0378-1097
PU Oxford University Press (OUP)
VL 369
IS 1
UT 000784356900002
DI 10.1093/femsle/fnac039
ID 87716
ER

EF