Variation in gut microbial contribution of essential amino acids to host protein metabolism in a wild small mammal community

Besser, Alexi C.; Manlick, Philip J.; Blevins, Christina; Takacs-Vesbach, Cristina; Newsome, Seth D.

doi:10.1111/ele.14246

Cited by 5 publications

(1 citation statement)

References 79 publications

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“…Gut microbiome has a wide diversity of nitrogen sources available, allowing diverse microbial metabolic pathways, showing a mechanism that can decouple consumers δ 15 N values in relation to their diet, and hence microbial contribution to trophic position estimations. In fact, gut microbiome maintains host protein balance by provisioning essential macromolecules, as shown in terrestrial mammals, playing a key role in protein metabolism (Besser et al 2023). These mechanisms, however, remain poorly explored for marine consumers (Rix et al 2020).…”

Section: Potential Sources Of Uncertaintymentioning

confidence: 99%

A missing trophic link: Contribution of the microbial loop to the estimation of the trophic position of pelagic consumers

Viana,

García‐Seoane,

Bode

2023

Limnology & Oceanography

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Trophic position estimation has been a central issue in food web studies. Estimates using compound‐specific isotopic analyses of amino acids were generally based on the trophic enrichment of glutamic acid. However, this trophic position estimation mainly accounts for the trophic steps involving metazoa, as the isotopic fractionation of this amino acid is minimal at trophic steps within the microbial food web. Alternatively, trophic position estimates based on alanine seem to also reflect microbial trophic steps. The difference between these estimations can provide an index of the microbial food web contribution to the trophic position of a particular consumer. Here, we examined the differences between both trophic position estimates through a meta‐analysis of the published data over a large range of marine consumers. The results suggest that the microbial contribution to trophic position decreases as trophic position increases in the marine pelagic food web, showing the lowest values in top consumers. Ureotelic organisms showed the highest microbial contributions. The current data point to an upper limit for the estimation of this index at δ15N values of glutamic acid or alanine of ~ 18.5‰, or trophic positions of 3.9 or 4.7 for fish and ammoniotelic organisms, respectively. Under the stable isotope lens, bacteria and protists may play a key role in the estimation of trophic positions of consumers. However, uncertainties that related both to the microbial loop (e.g., metabolic bacterial pathways) and to metazoan consumers (e.g., influence of the gut microbiome) still obscure the establishment of clear quantitative links between microbial and metazoan food webs.

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Section: Potential Sources Of Uncertaintymentioning

confidence: 99%

A missing trophic link: Contribution of the microbial loop to the estimation of the trophic position of pelagic consumers

Viana,

García‐Seoane,

Bode

2023

Limnology & Oceanography

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Community composition and organic carbon flux in twilight zone communities of The Tongue of the Ocean and Exuma Sound, The Bahamas

Shipley,

Muller-Karger,

Delaney

et al. 2024

Deep Sea Research Part I: Oceanographic Research Papers

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The response of gut and fecal bacterial communities of the European sea bass (Dicentrachus labrax) fed a low fish-plant meal and yeast protein supplementation diet

Meziti,

Nikouli,

Papaharisis

et al. 2024

Sustainable Microbiology

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As aquaculture is nowadays the major fish-food production sector, continuous research is undergoing for aquafeeds that could replace conventional fishmeal in order to enhance its environmental and economic sustainability. Fish gut microorganisms might be involved in nutrient assimilation and thus they are crucial for their hosts’ well-being. In this study the bacterial diversity was investigated by16S rRNA gene metabarcoding in order to investigate changes in midgut (M) and feces (F) microbiota of sea bass Dicentrachus labrax fed with conventional (C) and innovative-low fish meal diet (I), aiming at discovering microbiota that could be associated with the enhancement of host's health and productivity. Our results indicated that Proteobacteria (Pseudomonadota) prevailed in all samples followed by Firmicutes (Bacillota) or Bacteroidota (mostly in feces), while fecal communities were richer. Taxonomic distributions at the operational taxonomic unit level in midgut samples revealed differentially abundant fermentative species that prevailed in individuals fed with the innovative diet. Especially Staphylococcus was more abundant in MI samples implying enhancement from ingredients present only in the innovative diet and implying that this feed shapes rather favorable microbiota, which could support the digestion and good growth performance in aquaculture.

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Variation in gut microbial contribution of essential amino acids to host protein metabolism in a wild small mammal community

Cited by 5 publications

References 79 publications

A missing trophic link: Contribution of the microbial loop to the estimation of the trophic position of pelagic consumers

A missing trophic link: Contribution of the microbial loop to the estimation of the trophic position of pelagic consumers

Community composition and organic carbon flux in twilight zone communities of The Tongue of the Ocean and Exuma Sound, The Bahamas

The response of gut and fecal bacterial communities of the European sea bass (Dicentrachus labrax) fed a low fish-plant meal and yeast protein supplementation diet

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