67 research outputs found
New host and distribution expansion for Pterygodermatites (Multipectines) affinis
No full textThe present study reports the first case of infection by Pterygodermatites affinis in Lycalopex gymnocercus, and the first report of this nematode in Argentina. Examining 80 foxes from Buenos Aires province, specimens of this species were recovered from 21.25 % of the small intestines and eggs were found in 7.5 % of the fecal samples.Fil: Scioscia, Nathalia Paula. Universidad Nacional de Mar del Plata. Facultad de Ciencias Exactas y Naturales. Departamento de Biología. Laboratorio de Zoonosis Parasitarias; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Beldomenico, Pablo Martín. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Ciencias Veterinarias del Litoral. Universidad Nacional del Litoral. Facultad de Ciencias Veterinarias. Instituto de Ciencias Veterinarias del Litoral; ArgentinaFil: Denegri, Guillermo Maria. Universidad Nacional de Mar del Plata. Facultad de Ciencias Exactas y Naturales. Departamento de Biología. Laboratorio de Zoonosis Parasitarias; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentin
Haematological parameters of the White-eared Opossum, Didelphis albiventris (Lund, 1841), wild populations of central Argentina
No full textThe objective of this study was to assess haematological parameters in free-ranging white-bellied opossums (Didelphis albiventris) in the central region of Argentina. Total and differential blood cell counts were conducted in thirty-nine captured individuals. The mean (± standard deviation) values obtained were: erythrocytes 5.01 (±2.4) x 10 6 ?L-1, leukocytes: 27,097 (±14,313) ?L-1; neutrophils 7,600 (±7,097) ?L-1 (including immature neutrophils: 794 (±2,738) ?L-1); lymphocytes: 13,110 (±7,541)\n?L-1; basophils: 1,218 (±1,441) ?L-1; eosinophils: 1,983 (±2,458) ?L-1; monocytes: 2,321 (±2,818) ?L-1,. Multivariable statistical analysis showed that neutrophils were strongly associated with sex (p = 0.006). The levels of neutrophils in females doubled that of males. Eosinophils were associated with season. In summer there were significantly greater eosinophils levels than in the winter (p = 0.042). Morphological alterations of erythrocytes were observed in approximately 55% of the blood samples, most of which were stomatocytes and rouleau. A cell type not previously described for this species, annular leukocyte, was also found.Fil: Tarragona, E.L. Universidad Nacional del Litoral. Facultad de Ciencias Veterinarias. Laboratorio de Ecología de Enfermedades. Santa Fe, ArgentinaFil: Tarragona, E.L. Universidad Nacional del Litoral. Facultad de Ciencias Veterinarias. Grupo Capibara. Santa Fe, ArgentinaFil: Zurvera, D. Universidad Nacional del Litoral. Facultad de Ciencias Veterinarias. Laboratorio de Ecología de Enfermedades. Santa Fe, ArgentinaFil: Zurvera, D. Universidad Nacional del Litoral. Facultad de Ciencias Veterinarias. Grupo Capibara. Santa Fe, ArgentinaFil: Manzoli, D.E. Universidad Nacional del Litoral. Facultad de Ciencias Veterinarias. Laboratorio de Ecología de Enfermedades. Santa Fe, ArgentinaFil: Manzoli, D.E. Universidad Nacional del Litoral. Facultad de Ciencias Veterinarias. Grupo Capibara. Santa Fe, ArgentinaFil: Correa, A.I. Universidad Nacional del Litoral. Facultad de Ciencias Veterinarias. Laboratorio de Ecología de Enfermedades. Santa Fe, ArgentinaFil: Correa, A.I. Universidad Nacional del Litoral. Facultad de Ciencias Veterinarias. Grupo Capibara. Santa Fe, ArgentinaFil: Delgado, A.R. Universidad Nacional del Litoral. Facultad de Ciencias Veterinarias. Cátedra de Bacteriología y Micología. Santa Fe, ArgentinaFil: Delgado, A.R. Universidad Nacional del Litoral. Facultad de Ciencias Veterinarias. Grupo Capibara. Santa Fe, ArgentinaFil: Mastropaolo, M. Universidad Nacional del Litoral. Facultad de Ciencias Veterinarias. Cátedra de Parasitología y Enfermedades Parasitarias. Santa Fe, ArgentinaFil: Mastropaolo, M. CONICET. ArgentinaFil: Barengo, E. Universidad Nacional del Litoral. Facultad de Ciencias Veterinarias. Laboratorio de Ecología de Enfermedades. Santa Fe, ArgentinaFil: Barengo, E. Universidad Nacional del Litoral. Facultad de Ciencias Veterinarias. Grupo Capibara. Santa Fe, ArgentinaFil: Beldomenico, P.M. Universidad Nacional del Litoral. Facultad de Ciencias Veterinarias. Laboratorio de Ecología de Enfermedades. Santa Fe, ArgentinaFil: Beldomenico, P.M. Universidad Nacional del Litoral. Facultad de Ciencias Veterinarias. Grupo Capibara. Santa Fe, ArgentinaFil: Beldomenico, P.M. CONICET. ArgentinaEl objetivo de este trabajo fue obtener parámetros hematológicos en poblaciones silvestres de comadreja overa Didelphis albiventris de la región centro de la Argentina. Se capturaron 39 individuos, a todos ellos se les realizó un recuento total y diferencial de células sanguíneas. Los valores promedio (± desvío estándar) obtenidos fueron: eritrocitos 5,01 (±2,4) × 10 6 ?L-1; leucocitos 27.097 (±14.313) ?L-1; neutrófilos 7.600 (±7.097) ?L-1 (incluye inmaduros, 794 (±2.738) ?L-1); linfocitos 13.110 (±7.541) ?L-1; basófilos 1.218 (±1.441) ?L-1; eosinófilos 1.983 (±2.458) ?L-1; y monocitos 2.321 (±2.818) ?L-1. La existencia de asociaciones entre estos parámetros y factores ambientales (estación) y del animal (sexo y edad) fue evaluada mediante regresión lineal multivariable. Se estableció que los neutrófilos estuvieron significativamente asociados a sexo (p=0.006). Los machos tenían la mitad de los niveles de neutrófilos que las hembras. Los eosinófilos estuvieron asociados a la estación. En verano hubo significativamente más eosinófilos que en invierno (p=0.042). En los extendidos sanguíneos se observaron alteraciones morfológicas de eritrocitos en aproximadamente 55% de las muestras analizadas, las más habituales fueron pilas en monedas y estomatocitos. También se visualizó un tipo celular no descripto anteriormente para esta especie, leucocito anular
Philornis angustifrons Loew 1861
No full textPhilornis angustifrons (Loew, 1861) Hylemyia angustifrons Loew, 1861: 41. Syntypes male and female, not found (not in MCZ or ZMHB). Type-locality: Cuba. Described in the genus Hylemyia by Loew (1861), this species was based on material from Cuba. According to Carvalho et al. (2005), syntypes (male and female) were not found in MCZ or ZMHB. This species has been mistakenly recorded from Argentina by Garcia (1952). In synonymy with it is Mydaea anomala (Jaennicke, 1867), originally described as Mesembrina anomala, also from Cuba. This species is not the same as Mydaea anomala of Nielsen (1913) (= Philornis anomala of Aldrich 1923), which was described as P. nielseni by Dodge (1968). Both Stein (1918) and Dodge and Aitken (1968) mentioned that this species shows considerable intraspecific variation, e.g., in size and colour and, “likewise there is much variation in the puparia of such species as trinitensis, sanguinis and deceptivus, in general the larger puparia are dark brown with a small deep pit, whereas the smaller puparia are light brown with the pit broad and shallow (Dodge & Aitken 1968: 135). Other references to the names angustifrons and anomala in Argentina refer to anomala of Nielsen (1911, 1913). Even the synonymy of P. angustifrons (Loew) with anomala Nielsen was a confused interpretation by Aldrich (1923). The name P. angustifrons of Garcia (1952) also does not correspond to this species. He used this name, following Aldrich’s (1923) synonymy. This synonymy must not be accepted. Aldrich (1923) used Nielsen’s (1911, 1913) figures to represent the posterior spiracular slits of the puparia of M. torquans Nielsen and M. anomala of Nielsen (not Jaennicke) respectively. But on page 307, when discussing the synonymy with angustifrons Loew, he used the name anomala referring to M. anomala Jaennicke and not M. anomala of Nielsen. This is clear because he mentioned that “both species are described from Cuba, clearly referring to angustifrons Loew and anomala Jaennicke. Also, M. anomala of Nielsen 1913 (slits figured in his Fig. 3) could not be P. angustifrons Loew, as the posterior spiracular slits of this species are very sinuous, much more similar to those of P. pici, illustrated in his Fig. 5. Returning to Garcia’s (1952) angustifrons, his description, based on three females and one male (taken as larvae from a young chicken) from Monte Bello (Tucumán), is not very detailed, but differs from the true P. angustifrons in some aspects such as general colour of the thorax, r-m cross vein with a small mark and the large frons of the female with almost parallel margins. He described the female, but his Figure 1 (op. cit.: 279) shows the head of a male that is also not of P. angustifrons (as also observed by Dodge 1968). By mistake he mentioned the author of this species as (Jaenn., 1866) (see also Dodge 1968). Dodge (1968) considered that Garcia’s (1952) angustifrons could be anomala of Nielsen (1913), but the male head illustrated in his Figure 1 “fits neither nielseni nor angustifrons (p. 158). He doubtfully included Philornis angustifrons (Jaenn., 1866) of Garcia (1952) in synonymy with P. nielseni. Dodge and Aitken (1968) redescribed and Couri (1984) diagnosed P. angustifrons. The species shows intra-specific variation in colour, size, puparial concavity (depth and rugosity) and male surstyli (Dodge & Aitken 1968; Couri 1984).Published as part of Couri, Márcia S., Antoniazzi, Leandro R., Beldomenico, Pablo & Quiroga, Martin, 2009, Argentine Philornis Meinert species (Diptera: Muscidae) with synonymic notes, pp. 52-62 in Zootaxa 2261 on pages 56-57, DOI: 10.5281/zenodo.19076
Parasitologic examination and associated risk factors of domestic dogs at the domestic-wildlife interface in the Iberá wetlands Ecoregion, Argentina
No full textThe wildlife-domestic interface represents points of contact between wild animals and human-associated domestic animals, and provides opportunities for the dissemination and transmission of parasitic agents. Domestic dogs are reservoirs of parasitic agents, many of which are capable of infecting wild animals. To better investigate this potential risk at the Iberá wetlands eco-region, fecal samples from dogs present at the wildlife-domestic interface of two protected areas in Corrientes province, Argentina were examined. The prevalence of intestinal parasites and overall generic richness were examined and associations with age, sex, body condition, anthelmintic treatments and dog movement restriction were explored. From August-September 2017, questionnaires were carried out and fecal samples collected from 51 dogs at the interface zones. The overall estimated prevalence of gastrointestinal parasites was 63%. Nine genera of helminths and four protozoans were found in the examined dogs, many of which are known to infect wild carnivores and several have zoonotic potential. Ancylostoma and Isospora were the most prevalent genera. Freedom to roam was positively associated with prevalence and richness. From all dogs in our study, only a small proportion (17%) is subjected to some degree of movement restriction, while most dogs were free roaming. Veterinary health care and treatment was also extremely limited. The findings of this study revealed conditions of high prevalence of gastrointestinal parasites, lack of veterinary care and unrestricted roaming; all circumstances that suggest that dogs that live at these interface zones pose an infection risk to sympatric wildlife.Fil: Natalini, María Belén. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"; ArgentinaFil: Gennuso, María Sol. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"; ArgentinaFil: Beldomenico, Pablo Martín. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Ciencias Veterinarias del Litoral. Universidad Nacional del Litoral. Facultad de Ciencias Veterinarias. Instituto de Ciencias Veterinarias del Litoral; ArgentinaFil: Rigonatto, Teresita. Universidad Nacional del Nordeste; ArgentinaFil: Kowalewski, Martín M.. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"; Argentin
Sperimentazione 2009 in Italia Centro settentrionale e in Sicilia: Scegliere il sorgo giusto per le semine 2010.
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Datos moleculares nuevos sobre Philornis (Diptera: Muscidae) subcutáneas del sur de Sudamérica sugieren la existencia de un complejo de especies
No full textThe taxonomic identification of species in the genus Philornis Meinert (Diptera: Muscidae) has been based primarily upon analysis of morphological characters. However, relying solely on morphology has led to frequent species misidentification. This has been empirically demonstrated when specimens identified morphologically as Philornis seguyi have been reclassified as Philornis torquans based on DNA sequences of the second ribosomal internal transcribed spacer (ITS2), showing that the morphologic distinction between these 2 species is extremely challenging. Herein, new molecular data on specimens assigned to P. torquans and P. seguyi from the type locality of P. seguyi (Misiones province, Argentina) were analyzed. The ITS2 sequences obtained differed from those previously reported for Philornis, increasing to 3 the number of documented genotypes of flies morphologically indistinguishable from P. torquans. These results strongly suggest that subcutaneous Philornis spp. from southern South America could represent a species complex (P. torquans complex).La identificación taxonómica de especies del género Philornis Meinert (Diptera: Muscidae) ha estado basada principalmente en el análisis de los
caracteres morfológicos. Sin embargo, el uso exclusivo de información morfológica ha llevado con frecuencia a errores en la identificación de las
especies. Esto fue demostrado de forma empírica cuando especímenes morfológicamente identificados como P. seguyi fueron reclasificados como
P. torquans utilizando secuencias del segundo espaciador interno ribosomal transcrito (ITS2), lo que demuestra que la distinción morfológica entre
estas 2 especies es extremadamente complicada. En el presente trabajo se analizaron nuevos datos moleculares de especímenes identificados como
P. torquans y P. seguyi provenientes de la región reportada como localidad tipo para P. seguyi (provincia de Misiones, Argentina). Las secuencias
de ITS2 obtenidas fueron diferentes a aquellas previamente reportadas para otras especies de Philornis y se incrementa a 3 el número de genotipos
documentados de moscas morfológicamente indistinguibles asignadas a P. torquans. Estos resultados indican que los organismos de Philornis spp.
subcutáneos del sur de Sudamérica podrían representar un complejo de especies (complejo P. torquans).Fil: Quiroga, Martin Anibal. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Ciencias Veterinarias del Litoral. Universidad Nacional del Litoral. Facultad de Ciencias Veterinarias. Instituto de Ciencias Veterinarias del Litoral; Argentina. Universidad Autónoma de Entre Ríos; ArgentinaFil: Monje, Lucas Daniel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Ciencias Veterinarias del Litoral. Universidad Nacional del Litoral. Facultad de Ciencias Veterinarias. Instituto de Ciencias Veterinarias del Litoral; ArgentinaFil: Arrabal, Juan Pablo. Ministerio de Salud de la Nación; ArgentinaFil: Beldomenico, Pablo Martín. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Ciencias Veterinarias del Litoral. Universidad Nacional del Litoral. Facultad de Ciencias Veterinarias. Instituto de Ciencias Veterinarias del Litoral; Argentina. Universidad Nacional del Litoral. Facultad de Ciencias Veterinarias; Argentin
Within-Host Dynamics of Multi-Species Infections:Facilitation, Competition and Virulence
No full textHost individuals are often infected with more than one parasite species (parasites defined broadly, to include viruses and bacteria). Yet, research in infection biology is dominated by studies on single-parasite infections. A focus on single-parasite infections is justified if the interactions among parasites are additive, however increasing evidence points to non-additive interactions being the norm. Here we review this evidence and theoretically explore the implications of non-additive interactions between co-infecting parasites. We use classic Lotka-Volterra two-species competition equations to investigate the within-host dynamical consequences of various mixes of competition and facilitation between a pair of co-infecting species. We then consider the implications of these dynamics for the virulence (damage to host) of co-infections and consequent evolution of parasite strategies of exploitation. We find that whereas one-way facilitation poses some increased virulence risk, reciprocal facilitation presents a qualitatively distinct destabilization of within-host dynamics and the greatest risk of severe disease.</p
Philornis seguyi Garcia 1952
No full textPhilornis seguyi Garcia, 1952 Mydaea anomala: Nielsen (1913: 251). Misidentification, not Mesembrina anomala Jaennicke, 1867. Philornis seguyi Garcia, 1952: 286. Holotype male, lost (formerly in MSPBA?) Type-locality: Argentina, Misiones. Philornis nielseni Dodge, 1968: 157 (new name for anomala Jaennicke sensu Nielsen 1913). Holotype male (ZMUC). Type-locality: Argentina. Syn. nov. The species can be recognised as follows: body length 7–9mm; frons yellowish, eye with a faint golden reflection; width of frons at level of anterior ocellus 0.07–0.09 of head width in male and 0.13–0.14 in female; antenna and palpus yellow; cheek yellow-haired; scutum brown with greyish pollinosity, with the quadrivitatte pattern typical of the genus; wing clear, some specimens with a faint brown spot on r-m cross vein; legs yellow in male and somewhat brown in female; hind tibia on anterodorsal surface with 2–4 setae on middle third, anteroventral surface with 3–4 fine bristles on middle third. Abdomen brown with greyish pollinosity. Larva intradermal. Puparium brown, cylindrical, posterior end deep with rugose margins; spiracular slits “U or “V shaped. (Figures in Couri et al. 2005). Couri et al. (2005) described the larva, puparium, adult male and the terminalia of both sexes, based on material collected in Buenos Aires province and identified using the original description of Garcia (1952). The slight differences in size and colour of the legs described in P. nielseni by Dodge (1968) are here considered as intraspecific variation, as in other Philornis species. The synonymy of P. nielseni with P. seguyi is herein proposed as there is no justification to consider them as separate species. The species was found among the material recently collected in Argentina as below. Material examined: (MQ): Argentina, Santa Fe, Santa Fe, 3138 'S 6091 'W. Ex nest of Troglodytes aedon: 27 males and 44 females reared from larvae. (LRA): 4 adults reared from larvae. Host: Certhiaxis cinnamomea (Furnaridae); location: Puente de Hierro, Arroyo Culul, Santa Fe (3121 'S 6056 'W); collection date: November 2003; accession # SF00027b.Published as part of Couri, Márcia S., Antoniazzi, Leandro R., Beldomenico, Pablo & Quiroga, Martin, 2009, Argentine Philornis Meinert species (Diptera: Muscidae) with synonymic notes, pp. 52-62 in Zootaxa 2261 on page 58, DOI: 10.5281/zenodo.19076
Host-parasite association between Didelphis albiventris (Didelphimorphia: Didelphidae) and Ixodes loricatus (Acari: Ixodidae) in their southern ranges
No full textThe parasitism of Ixodes loricatus Neumann on white-eared opposum, Didelphis albiventris Lund, was analysed in the southern ranges of both. In central Argentina, 118 wild opossums were captured from 2005 to 2012. Adults of I. loricatus were collected (prevalence = 66.1%, mean = 7.03, median = 4), but no immature stage. Tick infestation was not affected by sex (p = 0.27) or age (p = 0.37) of hosts. In line with previous studies about seasonality of larvae and nymphs of I. loricatus, adult tick infestation showed no seasonal trend. This lack of seasonal pattern of infestation for all parasitic stages of I. loricatus may indicate a life cycle governed by nidicolous behaviour, in such a way that this habit would contribute to minimize the influence of external environmental variables. The tick sex ratio was female biased, with two females per one male (p = 0.002). The absence of I. loricatus immatures on D. albiventris suggests that in the study region there is clear segregation of immatures in rodents and adults in marsupials.Fil: Tarragona, Evelina Luisa. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe; Argentina. Instituto Nacional de Tecnología Agropecuaria. Centro Regional Santa Fe. Estación Experimental Agropecuaria Rafaela; ArgentinaFil: Mastropaolo, Mariano. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe; Argentina. Universidad Nacional del Litoral. Facultad de Ciencias Veterinarias; ArgentinaFil: Zurvera, Daniel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Ciencias Veterinarias del Litoral. Universidad Nacional del Litoral. Facultad de Ciencias Veterinarias. Instituto de Ciencias Veterinarias del Litoral; ArgentinaFil: Beldomenico, Pablo Martín. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Ciencias Veterinarias del Litoral. Universidad Nacional del Litoral. Facultad de Ciencias Veterinarias. Instituto de Ciencias Veterinarias del Litoral; ArgentinaFil: Guglielmone, Alberto Alejandro. Instituto Nacional de Tecnología Agropecuaria. Centro Regional Santa Fe. Estación Experimental Agropecuaria Rafaela; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe; Argentin
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