A microscopical view of the intestine of Onychochaeta borincana (Oligochaeta: Glossoscolecidae)

Méndez, Rafael; Borges, Sonia; Betancourt, Carlos

doi:10.1078/0031-4056-00278

Cited by 14 publications

(8 citation statements)

References 1 publication

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“…Often, gut contents of larval fish are observed by stereomicroscope which is not appropriate to observe phytoplankton (Kellermann, 1987). Consequently, Scanning Electron Microscope (SEM), already used to perform study on gut microflora (Jolly et al, 1993;Mendez et al, 2003), has also been used to study gut contents of P. antarcticum (Koubbi et al, 2007). This method enables determination of the vacuity of larval fish guts and diet composition more precisely.…”

Section: Introductionmentioning

confidence: 99%

Food preferences of larvae of Antarctic silverfish Pleuragramma antarcticum Boulenger, 1902 from Terre Adélie coastal waters during summer 2004

Vallet

Beans²,

Koubbi³

et al. 2011

Polar Science

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Ichthyoplankton samples were collected from 19 to 31 January 2004 in the Dumont d'Urville Sea (East Antarctic shelf). The Nototheniidae Pleuragramma antarcticum comprised more than 90% of the sampled larvae. Gut contents of 95 P antarcticum larvae were examined. Most larvae fed on phytoplankton, especially diatoms, whereas some other specimens had a mixed diet with phyto-and zooplankton prey. A single specimen fed exclusively on copepods. The stomach contents was dominated by three diatoms taxa, such as Thalassiothrix antarctica, Fragilariopsis spp. and Chaetoceros spp. Prey selection was apparently food density dependent, with an inverse relationship between food abundance and selection feeding. Larvae selected positively some diatoms, such as Coscinodiscus spp. and T. antarctica, presenting a low concentration in the water column compared to Fragilariopsis spp., which were strongly negatively selected. During summer, larvae were opportunistic feeders with a broad trophic niche, which allowed them to switch between different food types.

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Section: Introductionmentioning

confidence: 99%

Food preferences of larvae of Antarctic silverfish Pleuragramma antarcticum Boulenger, 1902 from Terre Adélie coastal waters during summer 2004

Vallet

Beans²,

Koubbi³

et al. 2011

Polar Science

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“…They have observed that the digestive fluid of earthworm show the same antimicrobial activity after feeding on soil and sterile sand, and partial sterilization of the gut with streptomycin does not lower the antimicrobial activity. Mendez et al (2003) observed that the guts of earthworms Onychochaeta borincana in sterile soil contain the same microorganisms as the guts of individuals that have been not submitted to the cleansing treatment. It is possible that antimicrobial activity in the guts of earthworms derived from metabolites of symbiotic bacteria from the gut walls.…”

Section: Discussionmentioning

confidence: 96%

Gut bacterium of Dendrobaena veneta (Annelida: Oligochaeta) possesses antimycobacterial activity

Fiołka

Zagaja

Piersiak

et al. 2010

Journal of Invertebrate Pathology

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“…Singleton et al (2003), however, found, when analysing gut samples with the help of a clone library approach in combination with fluorescence in situ hybridisation (FISH), bacteria tightly associated with the intestine of L. rubellus. Gut-wall attached microorganisms could also be found with scanning electron microscopy (SEM) (Jolly et al, 1993;Mendez et al, 2003), which indicates that an indigenous earthworm-specific gut microflora cannot Fig. 3.…”

Section: Discussionmentioning

confidence: 99%

Application of denaturing gradient gel electrophoresis for analysing the gut microflora ofLumbricus rubellusHoffmeister under different feeding conditions

Knapp

Seeber

Podmirseg

et al. 2008

Bull. Entomol. Res.

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The earthworm, Lumbricus rubellus, plays an essential role in soil ecosystems as it affects organic matter decomposition and nutrient cycling. By ingesting a mixture of organic and mineral material, a variety of bacteria and fungi are carried to the intestinal tract of the earthworm. To get a better understanding of the interactions between L. rubellus and the microorganisms ingested, this study tried to reveal if the diet affects the composition of the gut microflora of L. rubellus or if its intestinal tract hosts an indigenous, species-specific microbiota. A feeding experiment with L. rubellus was set up; individuals were collected in the field, transferred to a climate chamber and fed with food sources of different quality (dwarf shrub litter, grass litter or horse dung) for six weeks. DNA was extracted from the guts of the earthworms, as well as from the food sources and the surrounding soil, and further analysed by a molecular fingerprinting method, PCR-DGGE (Polymerase Chain Reaction -- Denaturing Gradient Gel Electrophoresis). We were able to demonstrate that the gut microbiota was strongly influenced by the food source ingested and was considerably different to that of the surrounding soil. Sequencing of dominant bands of the bacterial DGGE fingerprints revealed a strong occurrence of y-Proteobacteria in all gut samples, independent of the food source. A specific microflora in the intestinal tract of L. rubellus, robust against diet changes, could not be found.

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A microscopical view of the intestine of Onychochaeta borincana (Oligochaeta: Glossoscolecidae)

Cited by 14 publications

References 1 publication

Food preferences of larvae of Antarctic silverfish Pleuragramma antarcticum Boulenger, 1902 from Terre Adélie coastal waters during summer 2004

Food preferences of larvae of Antarctic silverfish Pleuragramma antarcticum Boulenger, 1902 from Terre Adélie coastal waters during summer 2004

Gut bacterium of Dendrobaena veneta (Annelida: Oligochaeta) possesses antimycobacterial activity

Application of denaturing gradient gel electrophoresis for analysing the gut microflora ofLumbricus rubellusHoffmeister under different feeding conditions

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