Decaying Cyanobacteria decrease N2O emissions related to diversity of intestinal denitrifiers of Chironomus plumosus

Sun, Xinwei; Hu, Zhixin; Jia, Wen; Duan, Cuilan; Yang, Liuyan

doi:10.4081/jlimnol.2014.1072

Cited by 4 publications

(3 citation statements)

References 53 publications

(86 reference statements)

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“…It is worth highlighting that wild mammals in this dataset also had significantly increased relative abundance of Cyanobacteria in conjunction with increased Alpha- and Betaproteobacteria, which are known nitrogen reducers. Alpha- and Betaproteobacteria increased in abundance with increased amounts of decaying cyanobacteria within the gut of the buzzer midge ( Chironomus plumosus ; Sun etal. 2014 ).…”

Section: Discussionmentioning

confidence: 99%

The Effects of Captivity on the Mammalian Gut Microbiome

McKenzie

Song

Delsuc

et al. 2017

Integrative and Comparative Biology

318

374

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SynopsisRecent studies increasingly note the effect of captivity or the built environment on the microbiome of humans and other animals. As symbiotic microbes are essential to many aspects of biology (e.g., digestive and immune functions), it is important to understand how lifestyle differences can impact the microbiome, and, consequently, the health of hosts. Animals living in captivity experience a range of changes that may influence the gut bacteria, such as diet changes, treatments, and reduced contact with other individuals, species and variable environmental substrates that act as sources of bacterial diversity. Thus far, initial results from previous studies point to a pattern of decreased bacterial diversity in captive animals. However, these studies are relatively limited in the scope of species that have been examined. Here we present a dataset that includes paired wild and captive samples from mammalian taxa across six Orders to investigate generalizable patterns of the effects captivity on mammalian gut bacteria. In comparing the wild to the captive condition, our results indicate that alpha diversity of the gut bacteria remains consistent in some mammalian hosts (bovids, giraffes, anteaters, and aardvarks), declines in the captive condition in some hosts (canids, primates, and equids), and increases in the captive condition in one host taxon (rhinoceros). Differences in gut bacterial beta diversity between the captive and wild state were observed for most of the taxa surveyed, except the even-toed ungulates (bovids and giraffes). Additionally, beta diversity variation was also strongly influenced by host taxonomic group, diet type, and gut fermentation physiology. Bacterial taxa that demonstrated larger shifts in relative abundance between the captive and wild states included members of the Firmicutes and Bacteroidetes. Overall, the patterns that we observe will inform a range of disciplines from veterinary practice to captive breeding efforts for biological conservation. Furthermore, bacterial taxa that persist in the captive state provide unique insight into symbiotic relationships with the host.

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Section: Discussionmentioning

confidence: 99%

The Effects of Captivity on the Mammalian Gut Microbiome

McKenzie

Song

Delsuc

et al. 2017

Integrative and Comparative Biology

318

374

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“…It was suggested that these N 2 O emissions were mainly constrained by the temperature and NO 3 − concentrations [47]. A recent study by Sun et al [48] revealed that with the presence of nutritional food such as planktonic cyanobacteria, N 2 O production in the larval gut can significantly decrease. Cyanobacterial blooms, a common phenomenon in the Curonian Lagoon, may explain why we observed low N 2 O production in our study.…”

Section: Discussionmentioning

confidence: 99%

The Effect of Chironomid Larvae on Nitrogen Cycling and Microbial Communities in Soft Sediments

Samuilovienė

Bartoli

Bonaglia

et al. 2019

Water

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The combination of biogeochemical methods and molecular techniques has the potential to uncover the black-box of the nitrogen (N) cycle in bioturbated sediments. Advanced biogeochemical methods allow the quantification of the process rates of different microbial processes, whereas molecular tools allow the analysis of microbial diversity (16S rRNA metabarcoding) and activity (marker genes and transcripts) in biogeochemical hot-spots such as the burrow wall or macrofauna guts. By combining biogeochemical and molecular techniques, we analyzed the role of tube-dwelling Chironomus plumosus (Insecta, Diptera) larvae on nitrification and nitrate reduction processes in a laboratory experiment with reconstructed sediments. We hypothesized that chironomid larvae stimulate these processes and host bacteria actively involved in N-cycling. Our results suggest that chironomid larvae significantly enhance the recycling of ammonium (80.5 ± 48.7 µmol m −2 h −1 ) and the production of dinitrogen (420.2 ± 21.4 µmol m −2 h −1 ) via coupled nitrification-denitrification and the consumption of water column nitrates. Besides creating oxygen microniches in ammonium-rich subsurface sediments via burrow digging and ventilation, chironomid larvae serve as hot-spots of microbial communities involved in N-cycling. The quantification of functional genes showed a significantly higher potential for microbial denitrification and nitrate ammonification in larvae as compared to surrounding sediments. Future studies may further scrutinize N transformation rates associated with intimate macrofaunal-bacteria associations.

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“…Recent studies demonstrate that chironomid larvae are hosts for a diverse bacterial community involved in different N-cycling pathways (Poulsen et al, 2014;Samuiloviene et al, 2019;Stief et al, 2009Stief et al, , 2010Sun et al, 2015). Ingested bacteria can also remain active and continue their metabolic activity inside the body of their host (Poulsen et al, 2014;Stief et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

A bioturbator, a holobiont, and a vector: The multifaceted role of Chironomus plumosus in shaping N‐cycling

et al. 2021

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Tube‐dwelling chironomid larvae are among the few taxa that can withstand and thrive in the organic‐rich sediments typical of eutrophic freshwater ecosystems. They can have multiple effects on microbial nitrogen (N) cycling in burrow environments, but such effects cease when chironomid larvae undergo metamorphosis into flying adults and leave the sediment. Here we investigated the ecological role of Chironomus plumosus by exploring the effect of its different life stages (as larva and adult midge) on microbial N transformations in a shallow freshwater lagoon by means of combined biogeochemical and molecular approaches. Results suggest that sediment bioturbation by chironomid larvae produce contrasting effects on nitrate (NO3‐)‐reduction processes. Denitrification was the dominant pathway of NO3‐ reduction (>90%), primarily fuelled by NO3‐ from bottom water. In addition to pumping NO3‐‐rich bottom water within the burrows, chironomid larvae host microbiota capable of NO3‐ reduction. However, the contribution of larval microbiota is lower than that of microbes inhabiting the burrow walls. Interestingly, dinitrogen fixation co‐occurred with NO3‐ reduction processes, indicating versatility of the larvae's microbial community. Assuming all larvae (averaging 1,800 ind./m2) leave the sediment following metamorphosis into flying adults, we estimated a displacement of 47,787 µmol of organic N/m2 from the sediment to the atmosphere during adult emergence. This amount of particulate organic N is similar to the entire N removal stimulated by larvae denitrification over a period of 20 days. Finally, the detection of N‐cycling marker genes in flying adults suggests that these insects retain N‐cycling microbes during metamorphosis and migration to the aerial and terrestrial ecosystems. This study provides evidence that chironomids have a multifaceted role in shaping the N cycle of aquatic ecosystems.

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Decaying Cyanobacteria decrease N2O emissions related to diversity of intestinal denitrifiers of Chironomus plumosus

Abstract: Nitrous oxide (N 2 O) emission of fresh invertebrates has too long been neglected in eutrophic lakes

Cited by 4 publications

References 53 publications

The Effects of Captivity on the Mammalian Gut Microbiome

The Effects of Captivity on the Mammalian Gut Microbiome

The Effect of Chironomid Larvae on Nitrogen Cycling and Microbial Communities in Soft Sediments

A bioturbator, a holobiont, and a vector: The multifaceted role of Chironomus plumosus in shaping N‐cycling

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