Limits...
High nutrient availability reduces the diversity and stability of the equine caecal microbiota.

Hansen NC, Avershina E, Mydland LT, Næsset JA, Austbø D, Moen B, Måge I, Rudi K - Microb. Ecol. Health Dis. (2015)

Bottom Line: It is well known that nutrient availability can alter the gut microbiota composition, while the effect on diversity and temporal stability remains largely unknown.These observations concur with general ecological theories, suggesting a stabilising effect of biological diversity and that high nutrient availability has a destabilising effect through reduced diversity.Nutrient availability does not only change the composition but also the ecology of the caecal microbiota.

View Article: PubMed Central - PubMed

Affiliation: Department of Animal and Aquacultural Sciences, Norwegian University of Life Sciences, Aas, Norway.

ABSTRACT

Background: It is well known that nutrient availability can alter the gut microbiota composition, while the effect on diversity and temporal stability remains largely unknown.

Methods: Here we address the equine caecal microbiota temporal stability, diversity, and functionality in response to diets with different levels of nutrient availability. Hay (low and slower nutrient availability) versus a mixture of hay and whole oats (high and more rapid nutrient availability) were used as experimental diets.

Results: We found major effects on the microbiota despite that the caecal pH was far from sub-clinical acidosis. We found that the low nutrient availability diet was associated with a higher level of both diversity and temporal stability of the caecal microbiota than the high nutrient availability diet. These observations concur with general ecological theories, suggesting a stabilising effect of biological diversity and that high nutrient availability has a destabilising effect through reduced diversity.

Conclusion: Nutrient availability does not only change the composition but also the ecology of the caecal microbiota.

No MeSH data available.


Related in: MedlinePlus

OTU's. Mean difference between the two diets. Bar plot illustrating the mean difference between the two diets in abundances of bacterial representatives of the phyla: Bacteroidetes, Firmicutes, Proteobacter, Spirochaetes, and Tenericutes. Bacterial representatives with mean difference values above the zero line imply that they showed a higher mean abundance in the hay-fed horses than in whole oats–fed horses, whereas bacterial representatives with mean difference values under the zero line imply that they had a higher mean abundance in the whole oats–fed horses. Bacterial representatives marked with a star (*) means that the OTUs were not identified down to the family level. Error bars represent standard deviations.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC4526772&req=5

Figure 0003: OTU's. Mean difference between the two diets. Bar plot illustrating the mean difference between the two diets in abundances of bacterial representatives of the phyla: Bacteroidetes, Firmicutes, Proteobacter, Spirochaetes, and Tenericutes. Bacterial representatives with mean difference values above the zero line imply that they showed a higher mean abundance in the hay-fed horses than in whole oats–fed horses, whereas bacterial representatives with mean difference values under the zero line imply that they had a higher mean abundance in the whole oats–fed horses. Bacterial representatives marked with a star (*) means that the OTUs were not identified down to the family level. Error bars represent standard deviations.

Mentions: The mean dietary effect on difference in abundances was calculated, and only OTUs with significant dietary effect are shown in Fig. 3. In horses fed the oat diet, the caecal abundance of several bacterial families in the order of Bacteroidetes (Porphyromonadacae, unknown Bacteroidetes Cluster II), Veillonellaceae and several bacterial families in the order of Proteobacteria (Alcaligenaceae, Oxalobacteraceae, Deltaproteobacteria, and Succinivibrionaceae) increased (Fig. 3). In horses on the hay diet, the caecal abundance of several families inside the firmicutes phylum were higher than in horses fed the oat diet (Catabacteriaceae, Clostridiaceae, Lachnospiraceae, and Ruminococcaceae). In addition, the family Spirochaceae and several families inside the Tenericutes phylum (Spirochataceae, Erysipelotrichaceae, Anaeroplasmataceae, and unknown Tenericutes) also showed increased abundances in the caecum of horses fed the oat diet.


High nutrient availability reduces the diversity and stability of the equine caecal microbiota.

Hansen NC, Avershina E, Mydland LT, Næsset JA, Austbø D, Moen B, Måge I, Rudi K - Microb. Ecol. Health Dis. (2015)

OTU's. Mean difference between the two diets. Bar plot illustrating the mean difference between the two diets in abundances of bacterial representatives of the phyla: Bacteroidetes, Firmicutes, Proteobacter, Spirochaetes, and Tenericutes. Bacterial representatives with mean difference values above the zero line imply that they showed a higher mean abundance in the hay-fed horses than in whole oats–fed horses, whereas bacterial representatives with mean difference values under the zero line imply that they had a higher mean abundance in the whole oats–fed horses. Bacterial representatives marked with a star (*) means that the OTUs were not identified down to the family level. Error bars represent standard deviations.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4526772&req=5

Figure 0003: OTU's. Mean difference between the two diets. Bar plot illustrating the mean difference between the two diets in abundances of bacterial representatives of the phyla: Bacteroidetes, Firmicutes, Proteobacter, Spirochaetes, and Tenericutes. Bacterial representatives with mean difference values above the zero line imply that they showed a higher mean abundance in the hay-fed horses than in whole oats–fed horses, whereas bacterial representatives with mean difference values under the zero line imply that they had a higher mean abundance in the whole oats–fed horses. Bacterial representatives marked with a star (*) means that the OTUs were not identified down to the family level. Error bars represent standard deviations.
Mentions: The mean dietary effect on difference in abundances was calculated, and only OTUs with significant dietary effect are shown in Fig. 3. In horses fed the oat diet, the caecal abundance of several bacterial families in the order of Bacteroidetes (Porphyromonadacae, unknown Bacteroidetes Cluster II), Veillonellaceae and several bacterial families in the order of Proteobacteria (Alcaligenaceae, Oxalobacteraceae, Deltaproteobacteria, and Succinivibrionaceae) increased (Fig. 3). In horses on the hay diet, the caecal abundance of several families inside the firmicutes phylum were higher than in horses fed the oat diet (Catabacteriaceae, Clostridiaceae, Lachnospiraceae, and Ruminococcaceae). In addition, the family Spirochaceae and several families inside the Tenericutes phylum (Spirochataceae, Erysipelotrichaceae, Anaeroplasmataceae, and unknown Tenericutes) also showed increased abundances in the caecum of horses fed the oat diet.

Bottom Line: It is well known that nutrient availability can alter the gut microbiota composition, while the effect on diversity and temporal stability remains largely unknown.These observations concur with general ecological theories, suggesting a stabilising effect of biological diversity and that high nutrient availability has a destabilising effect through reduced diversity.Nutrient availability does not only change the composition but also the ecology of the caecal microbiota.

View Article: PubMed Central - PubMed

Affiliation: Department of Animal and Aquacultural Sciences, Norwegian University of Life Sciences, Aas, Norway.

ABSTRACT

Background: It is well known that nutrient availability can alter the gut microbiota composition, while the effect on diversity and temporal stability remains largely unknown.

Methods: Here we address the equine caecal microbiota temporal stability, diversity, and functionality in response to diets with different levels of nutrient availability. Hay (low and slower nutrient availability) versus a mixture of hay and whole oats (high and more rapid nutrient availability) were used as experimental diets.

Results: We found major effects on the microbiota despite that the caecal pH was far from sub-clinical acidosis. We found that the low nutrient availability diet was associated with a higher level of both diversity and temporal stability of the caecal microbiota than the high nutrient availability diet. These observations concur with general ecological theories, suggesting a stabilising effect of biological diversity and that high nutrient availability has a destabilising effect through reduced diversity.

Conclusion: Nutrient availability does not only change the composition but also the ecology of the caecal microbiota.

No MeSH data available.


Related in: MedlinePlus