INVESTIGADORES
ROSSIN Maria Alejandra
artículos
Título:
Parasitism underground: determinants of helminth
Autor/es:
ROSSIN M. ALEJANDRA; MALIZIA ANA INÉS; TIMI JUAN TOMÁS; POULIN ROBERT
Revista:
PARASITOLOGY
Editorial:
CAMBRIDGE UNIV PRESS
Referencias:
Año: 2010 p. 1569 - 1575
ISSN:
0031-1820
Resumen:
SUMMARY
Patterns of infection among hosts in a population are often driven by intrinsic host features such as age or sex, as well as by
positive or negative interactions between parasite species. We investigated helminth parasitism in 2 South American rodent
species, Ctenomys australis and C. talarum (Octodontidae), to determine whether the unusual solitary and subterranean
nature of these hosts would impact their patterns of infection. We applied generalized linear models to infection data on a
total of 7 helminth species (1 in C. australis and 6 in C. talarum). Host age and season of capture influenced infection levels
in some of the helminth species, but none were influenced by host body condition. In C. talarum, 4 pairs of helminth species
showed significant associations, either asymmetrical or symmetrical, and with 3 of the 4 being positive ; strong inter-specific
facilitation appears likely in 1 case. Also, we found that female hosts, especially non-pregnant ones, harboured heavier
infections of 2 nematode species than male hosts. This is in sharp contrast to the general male-bias reported for most studies
of nematodes in wild mammals, and we develop explanations for these results based on the unusual ecology of these
subterranean rodents.
Ctenomys australis and C. talarum (Octodontidae), to determine whether the unusual solitary and subterranean
nature of these hosts would impact their patterns of infection. We applied generalized linear models to infection data on a
total of 7 helminth species (1 in C. australis and 6 in C. talarum). Host age and season of capture influenced infection levels
in some of the helminth species, but none were influenced by host body condition. In C. talarum, 4 pairs of helminth species
showed significant associations, either asymmetrical or symmetrical, and with 3 of the 4 being positive ; strong inter-specific
facilitation appears likely in 1 case. Also, we found that female hosts, especially non-pregnant ones, harboured heavier
infections of 2 nematode species than male hosts. This is in sharp contrast to the general male-bias reported for most studies
of nematodes in wild mammals, and we develop explanations for these results based on the unusual ecology of these
subterranean rodents.
C. australis and 6 in C. talarum). Host age and season of capture influenced infection levels
in some of the helminth species, but none were influenced by host body condition. In C. talarum, 4 pairs of helminth species
showed significant associations, either asymmetrical or symmetrical, and with 3 of the 4 being positive ; strong inter-specific
facilitation appears likely in 1 case. Also, we found that female hosts, especially non-pregnant ones, harboured heavier
infections of 2 nematode species than male hosts. This is in sharp contrast to the general male-bias reported for most studies
of nematodes in wild mammals, and we develop explanations for these results based on the unusual ecology of these
subterranean rodents.
C. talarum, 4 pairs of helminth species
showed significant associations, either asymmetrical or symmetrical, and with 3 of the 4 being positive ; strong inter-specific
facilitation appears likely in 1 case. Also, we found that female hosts, especially non-pregnant ones, harboured heavier
infections of 2 nematode species than male hosts. This is in sharp contrast to the general male-bias reported for most studies
of nematodes in wild mammals, and we develop explanations for these results based on the unusual ecology of these
subterranean rodents.