@misc{detoni_cyanobacterial_diazotroph_2022, 
author={Detoni, A., Subramanian, A., Haley, S., Dyhrman, S., Calil, P.},
title={Cyanobacterial Diazotroph Distributions in the Western South Atlantic},
year={2022},
howpublished = {journal article},
doi = {https://doi.org/10.3389/fmars.2022.856643},
abstract = {Inputs of new nitrogen by cyanobacterial diazotrophs are critical to ocean ecosystem structure and function. Relative to other ocean regions, there is a lack of data on the distribution of these microbes in the western South Atlantic. Here, the abundance of six diazotroph phylotypes: Trichodesmium, Crocosphaera, UCYN-A, Richelia associated with Rhizosolenia (Het-1) or Hemiaulus (Het-2), and Calothrix associated with Chaetoceros (Het-3) was measured by quantitative PCR (qPCR) of the nifH gene along a transect extending from the shelf-break to the open ocean along the Vitória-Trindade seamount chain (1200 km). Using nifH gene copies as a proxy for phylotype abundance, Crocosphaera signals were the most abundant, with a broad distribution throughout the study region. Trichodesmium signals were the second most abundant, with the greatest numbers confined to the warmer waters closer to the coast, and a significant positive correlation with temperature. The average signals for the host-associated diazotrophs (UCYN-A, Het-1, and Het-2) were consistently lower than for the other phylotypes. These findings expand measurements of cyanobacterial diazotroph distribution in the western South Atlantic, and provide a new resource to enhance modeling studies focused on patterns of nitrogen fixation in the global ocean.},
note = {Online available at: \url{https://doi.org/10.3389/fmars.2022.856643} (DOI). Detoni, A.; Subramanian, A.; Haley, S.; Dyhrman, S.; Calil, P.: Cyanobacterial Diazotroph Distributions in the Western South Atlantic. Frontiers in Marine Science. 2022. vol. 9, 856643. DOI: 10.3389/fmars.2022.856643}}