Do microbes contribute to the FDOM signature in the ocean?

• Main Authors: Castillo, Yaiza, Vaqué, Dolors, Lara, Elena, Catalá, Teresa S., Nieto-Cid, Mar, Romera-Castillo, Cristina, Morán, Xosé Anxelu G., Gasol, Josep M., Duarte, Carlos M., Marrasé, Cèlia
• Format: Still Image
• Language: unknown
• Published: 2016
• Subjects: Estrada; Indian; Pacific; North Atlantic
• Online Access: http://hdl.handle.net/10261/170751

XXXII Trobades Científiques de la Mediterrània, Planeta Oceà - Planet Ocean, celebradas del 5 al 7 de octubre de 2016 en Maó, Menorca.-- Homenatge als Drs. Marta Estrada, Jordi Font i Jordi Salat, pioners de l'oceanografia mediterrània moderna. A tribute to Drs. Marta Estrada, Jordi Font and Jordi Salat, pioneers of modern Mediterranean oceanography.-- 1 page Samples from the MALASPINA circumnavigation expedition (2010‐2011) were collected to study the influence of microbial abundances in the distribution of the fluorescent dissolved organic matter (FDOM). The FDOM excitation‐emission matrix (EEM) data, obtained using a Fluoromax‐4 spectrofluorimeter, were examined with Parallel Factor Analysis (PARAFAC). The PARAFAC analysis identified four components, two of them associated with humic‐like substances (C1 and C2) and the other two with protein‐like compounds (C3 and C4). In the specific context of this study, we will only refer to the protein‐like components: C3 corresponds to classic peak‐T, which is related to the essential aminoacid tryptophan (excitation‐emission 290/340 nm); and C4, associated to classic peak‐B, is related to the non‐essential aminoacid tyrosine (excitation‐emission 270/310 nm). We study the relationships between these two FDOM compounds and viruses and bacteria abundances compiled in the Malaspina database which includes values from 5 different oceanic basins (North Atlantic, South Atlantic, Indian, North Pacific and South Pacific). Samples were collected from 0 m to 4000 m depth, distinguishing three different layers (epipelagic 0‐200 m, mesopelagic 200‐1000 m, and bathypelagic 1000‐4000 m). Our aim was to determine if the dynamics of these FDOM components followed the evolution of the bacteria and/or viruses abundances. To achieve this objective we applied residual analyses to exclude the variability due to physicochemical parameters (temperature and salinity). When the whole database was considered, these parameters accounted for a high percentage (~60%) of both virus and prokaryotic ...