The role of the subterranean rodent Ctenomys talarum (Rodentia: Octodontidae) in the life cycle of Taenia taeniaeformis (Cestoda: Taeniidae) in urban environments

Rossin, Alejandra

doi:10.1016/s0304-4017(04)00103-7

Cited by 3 publications

(3 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The number of parasite eggs/oocysts present in fecal samples collected immediately after capture and at day 11 was quantified per individual (investigator JLM was blinded to the group origin of samples when processing them). This procedure ensures the detection of all taxa present in digestive tracts of tuco‐tucos, with the only exception of Taenia talicei (Rossin et al., ; Cutrera et al., ). Eggs/oocysts present in feces were assessed using the flotation technique proposed by Sheather (, already used for C. talarum (Merlo et al., ).…”

Section: Methodsmentioning

confidence: 99%

Food Restriction Affects Inflammatory Response and Nutritional State in Tuco-tucos (Ctenomys talarum)

2016

View full text Add to dashboard Cite

Insufficient or unbalanced food intake typically has a negative impact on immune responses. The understanding of this effect is, however, hampered by the effect that food has on general condition, which, in turn, affects immunity, and the interaction among general condition, immunocompetence, and concurrent infections. The goal of this study was to determine the effects of food restriction and methionine supplementation on immunity in tuco-tucos (Ctenomys talarum). Effects of diet manipulations on nutritional state, inflammatory response to phytohemagglutinin (PHA), and other immune parameters (bacterial killing capacity, natural antibodies, and leukocyte profile) were evaluated. Health and stress parameters and endoparasite loads were assessed to understand more deeply potential effects of treatments on immune status. Individuals under food restriction presented an altered nutritional state as well as increased stress levels (higher N: L ratios) compared with individuals fed ad libitum, and a marked reduction in the inflammatory response to PHA. Supplementation with methionine did not affect any of the parameters analyzed. Endoparasite loads were not affected by treatments. Our results support the idea that food insufficiency can modulate the individual's immune responsiveness through the lack of adequate essential nutrients, metabolic fuel and energetic reserves, or by a detrimental effect of the stress caused by nutrient limitation. We show that the response to PHA previously reported as nonenergetically costly for C. talarum, implies a nutritional cost; an opposite pattern to that previously found for the adaptive antibody response to sheep red blood cells in the same species.

show abstract

Section: Methodsmentioning

confidence: 99%

Food Restriction Affects Inflammatory Response and Nutritional State in Tuco-tucos (Ctenomys talarum)

2016

View full text Add to dashboard Cite

show abstract

“…To determine endoparasite loads, the number of parasite eggs/oocysts present in fecal samples collected immediately after capture and at day 7 was quantified per individual. This procedure allows the detection of all taxa present in digestive tracts of tuco‐tucos, with the only exception of Taenia talicei (Rossin et al, ). Eggs/oocysts present in feces were assessed using the flotation technique proposed by Sheather ().…”

Section: Methodsmentioning

confidence: 99%

Parasite infection negatively affects PHA-triggered inflammation in the subterranean rodentCtenomys talarum

2015

View full text Add to dashboard Cite

Magnitude and effectiveness of immune responses vary greatly between and within species. Among factors reported to determine this variation, parasitism is a critical one, although controversial effects of parasites over immunological indices have been reported. Information regarding immune strategies in species with different life histories is crucial to better understand the role of immune defenses in an ecological and evolutionary context. Here, we examine the influence of the parasite community on immune responsiveness of a solitary subterranean rodent, Ctenomys talarum. To do this, we assessed the impact of the natural parasite community and the experimental infection with Eimeria sp. on the phytohemagglutinin (PHA)-response, as well as other immune, condition, nutrition, and stress parameters. PHA-triggered inflammation was similarly impaired by Eimeria sp. infection alone or co-occurring with a number of gastrointestinal nematodes. None of the other physiological parameters studied were affected by parasitism. This indicates that parasitism is a general key factor modulating immune responsiveness of the host, and in particular for C. talarum, it could explain the great inter-individual variation previously observed in the PHA-response. Thus, our results highlight the importance of taking the parasite community into account in ecoimmunological studies, particularly when using immunological indices.

show abstract

“…To determine endoparasite loads, the number of parasite eggs/oocysts present in fecal samples collected immediately after capture was quantified. This procedure ensures the detection of all endoparasite present in Talas tuco-tucos, with the only exception of the species of Taenia talicei, which is found in the peritoneum and does not shed eggs in the feces (Cutrera et al, 2011;Rossin et al, 2004). Eggs/oocysts present in feces were assessed using the flotation technique proposed by Sheather (1923), as previously reported for C. talarum (Cutrera et al, 2011;Merlo et al, 2016b).…”

Section: Quantification Of Parasitesmentioning

confidence: 99%

Individual condition and inflammatory response to PHA in the subterranean rodent Ctenomys talarum (Talas tuco-tuco): A multivariate approach

et al. 2018

View full text Add to dashboard Cite

Several components of individual condition can modulate immune function in vertebrates. One of the most common techniques used by ecologists to estimate immune responsiveness in wild populations is the phytohemagglutinin (PHA)-skin test, which is usually considered a proxy of cell-mediated activity. To determine the influence of individual condition on the magnitude of this immune index we assessed the variability in the inflammatory response to PHA in the subterranean solitary rodent, Ctenomys talarum (Talas tuco-tucos), including 18 variables associated with different aspects of individual condition that are indicative of physical, physiological, parasitological and immunological state. A partial least square (PLS) regression analysis was performed on the condition and the response variables to identify those having greater contribution to overall variation in the response. The first two components explained together 77.5% of the maximum achievable explained variance in the inflammatory response to PHA (60% of total variance). Abundance of eggs of Trichuris pampeana, eosinophil, monocyte and neutrophil counts, together with reproductive condition were identified as the most important variables affecting the inflammatory response. The first component negatively associated the inflammatory response to PHA with the abundance of the nematode T. pampeana, and with counts of eosinophils and monocytes. The second component negatively associated the inflammatory response to PHA with reproductive condition, neutrophils and eosinophils. We discuss the general negative effect of infection on the immune responsiveness of wild animals and highlight the usefulness of the multivariate approaches in providing information on physiology, parasitology and health relationships to assess patterns of variation in immune responses.

show abstract

The role of the subterranean rodent Ctenomys talarum (Rodentia: Octodontidae) in the life cycle of Taenia taeniaeformis (Cestoda: Taeniidae) in urban environments

Cited by 3 publications

References 0 publications

Food Restriction Affects Inflammatory Response and Nutritional State in Tuco-tucos (Ctenomys talarum)

Food Restriction Affects Inflammatory Response and Nutritional State in Tuco-tucos (Ctenomys talarum)

Parasite infection negatively affects PHA-triggered inflammation in the subterranean rodentCtenomys talarum

Individual condition and inflammatory response to PHA in the subterranean rodent Ctenomys talarum (Talas tuco-tuco): A multivariate approach

Contact Info

Product

Resources

About