PERSONAL DE APOYO
RAGO MarÍa Virginia
congresos y reuniones científicas
Título:
Dynamics of gastrointestinal parasitism in free-ranging guanacos (Lama guanicoe).
Autor/es:
MORENO P.; OVEJERO R.; COLOMBO V.; RAGO V.; MACEDO A.; GUTIÉRREZ G.; BELDOMÉNICO P.; CARMANCHAHI P.
Lugar:
Puerto Iguazú
Reunión:
Conferencia; 59th Annual International Conference - Wildlife Disease Association; 2010
Institución organizadora:
Wildlife Diseases Association
Resumen:
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The guanaco (Lama guanicoe) is the dominant herbivore of South
American arid lands. In Reserva Provincial La Payunia (Argentina)
there is a population of 10,000 individuals, part of which is
live-sheared as part of a sustainable use program. Recently, the
importance of parasites for wildlife population dynamics has been
increasingly recognized. Moreover, stress can affect a populations
ability to thrive, as it jeopardizes the immunity of individuals,
increasing their vulnerability to parasites. With the aim of
investigating factors associated with variability in gastrointestinal
parasitism in guanacos, faeces collected during eight sampling
sessions in Payunia were analized with cualitative and cuantitative
copro-parsitological techniques. Additionally, plasmatic cortisol was
determined by radioimmunoassay. Parasites found belonged to the
Genera Eimeria, Nematodirus, Trichuris, and
Capillaria, but the two former largely prevailed. Prevalence
of Nematodirus spp. and oocyst counts of Eimeria spp.
were significantly higher in spring, and had their lowest values in
summer. Bachelor groups had lower Eimeria spp. intensities
than family and mixed groups, while the latter had higher prevalence
of Nematodirus spp. than other social groups. In males, oocyst
counts and plasmatic cortisol were negatively correlated. Faeces from
dung piles have lower loads of Eimeria spp. oocysts than those
shed away from piles, even within the same host age group. Guanacos
with higher intensities of Nematodirus spp. and Eimeria
spp. had significantly lower body condition. These results are
important to better understand how parasite ecology may influence
guanaco population dynamics, which may be key knowledge for effective
management and conservation programs.