Fixed-Nitrogen Loss Associated with Sinking Zooplankton Carcasses in a Coastal Oxygen Minimum Zone (Golfo Dulce, Costa Rica)

Stief, Peter; Lundgaard, Ann Sofie Birch; Ramírez, Álvaro; Thamdrup, Bo; Glud, Ronnie N.

doi:10.3389/fmars.2017.00152

Cited by 22 publications

(34 citation statements)

References 70 publications

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“…Recent publications have documented not only high level of dissimilatory nitrate and nitrite reduction activity but also the presence of genes involved in DNRA pathways in marine zooplankton‐associated microbial communities (Glud et al ., ; Stief et al ., ). Genes encoding enzymes for DNRA were also retrieved in the metagenome presented here.…”

Section: Discussionmentioning

confidence: 99%

“…However, our data (based on the relative gene abundances) point towards ammonium biosynthesis (thus, assimilatory nitrate/nitrite reduction) rather than N 2 gas dissipation by bacteria (Supporting Information Table S2). In contrast to previous reports on the presence of anammox and anaerobic methane oxidation on zooplankton's carcasses sinking through oxygen minimum zone (Stief et al ., ), the metagenome of zooplankton‐associated microbial communities from the open, well‐oxygenated Atlantic lacked genes indicative for these anaerobic pathways.…”

Section: Discussionmentioning

confidence: 99%

“…For example, microbes may exploit zooplankton as a nutrient-and carbonenriched microhabitat by colonizing its exoskeleton and/ or gut (Carman and Dobbs, 1997;Tang et al, 2010). Additionally to the nutrient-enriched conditions, the zooplankton's gut provides a hypoxic environment that may facilitate marginal but important anaerobic processes such as denitrification, dissimilatory nitrate or nitrite reduction and methanogenesis in the oxygenated open waters (De Angelis and Lee, 1994;Tang et al, 2011;Glud et al, 2015;Stief et al, 2017). Finally, the zooplankton's acidic digestive tract may promote iron recycling and solubilization via multiple pathways involving microbes (Tang et al, 2011;Nuester et al, 2014;Schmidt et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

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Metagenomic insights into zooplankton‐associated bacterial communities

Corte

Srivastava

Koski

et al. 2017

Environmental Microbiology

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SummaryZooplankton and microbes play a key role in the ocean's biological cycles by releasing and consuming copious amounts of particulate and dissolved organic matter. Additionally, zooplankton provide a complex microhabitat rich in organic and inorganic nutrients in which bacteria thrive. In this study, we assessed the phylogenetic composition and metabolic potential of microbial communities associated with crustacean zooplankton species collected in the North Atlantic. Using Illumina sequencing of the 16S rRNA gene, we found significant differences between the microbial communities associated with zooplankton and those inhabiting the surrounding seawater. Metagenomic analysis of the zooplankton‐associated microbial community revealed a highly specialized bacterial community able to exploit zooplankton as microhabitat and thus, mediating biogeochemical processes generally underrepresented in the open ocean. The zooplankton‐associated bacterial community is able to colonize the zooplankton's internal and external surfaces using a large set of adhesion mechanisms and to metabolize complex organic compounds released or exuded by the zooplankton such as chitin, taurine and other complex molecules. Moreover, the high number of genes involved in iron and phosphorus metabolisms in the zooplankton‐associated microbiome suggests that this zooplankton‐associated bacterial community mediates specific biogeochemical processes (through the proliferation of specific taxa) that are generally underrepresented in the ambient waters.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Metagenomic insights into zooplankton‐associated bacterial communities

Corte

Srivastava

Koski

et al. 2017

Environmental Microbiology

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“…Recently, intense anaerobic nitrogen cycling (Ncycling) was demonstrated in sinking phytodetritus aggregates that had an anoxic center, especially when exposed to low-oxygen conditions (Klawonn et al 2015. Similarly, sinking carcasses of diverse copepod species from different aquatic ecosystems displayed significant anaerobic N-cycling (Glud et al 2015, Stief et al 2017. The rates of carcass-associated anaerobic Ncycling increased with decreasing O 2 concentrations in the surrounding water, suggesting that the spatial extent of internal anoxia in copepod carcasses is mainly controlled by ambient O 2 levels.…”

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confidence: 99%

“…The denitrification pathway reduces NO 3 − to N 2 gas, which leads to fixed-nitrogen loss from aquatic ecosystems because of the relatively low bioavailability of N 2 . In small marine and freshwater copepod carcasses, dissimilatory nitrate reduction to ammonium (DNRA) and dissimilatory nitrate reduction to nitrite (DNRN) appear to be important anaerobic N-cycle pathways (Stief et al 2017(Stief et al , 2018. These 2 pathways do not directly contribute to fixed-nitrogen loss.…”

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confidence: 99%