1,721,035 research outputs found
FIGURES 6–10. Gyrodactylus breviradix n in Two new species of Gyrodactylus von Nordmann, 1832 (Monogenoidea: Gyrodactylidae) parasitizing introduced poeciliids in Patagonia
No full textFIGURES 6–10. Gyrodactylus breviradix n. sp. 6. Whole specimen. 7. Haptor. 8. Marginal hook. 9. Male copulatory organs. 10. Anchor.Published as part of Vega, Rocio, Razzolini, Emanuel, Arbetman, Marina & Viozzi, Gustavo, 2019, Two new species of Gyrodactylus von Nordmann, 1832 (Monogenoidea: Gyrodactylidae) parasitizing introduced poeciliids in Patagonia, pp. 423-433 in Zootaxa 4664 (3) on page 428, DOI: 10.11646/zootaxa.4664.3.9, http://zenodo.org/record/338561
FIGURE 1 in A new schistosome (Digenea: Schistosomatidae) from the nasal tissue of South America black-necked swans, Cygnus melancoryphus (Anatidae) and the endemic pulmonate snail Chilina gibbosa
No full textFIGURE 1. Map of sampling localities A) Location of Río Negro and Neuquén Provinces in Argentina and South America. B) Location of sampling points: Pellegrini Lake (collection of Cygnus melancoryphus of the present study and Chilina gibbosa studied in Flores et al. 2015), Mari Menuco Lake (collection of Cygnus melancoryphus).Published as part of Flores, Verónica, Viozzi, Gustavo, Casalins, Laura, Loker, Eric Samuel & Brant, Sara Vanessa, 2021, A new schistosome (Digenea: Schistosomatidae) from the nasal tissue of South America black-necked swans, Cygnus melancoryphus (Anatidae) and the endemic pulmonate snail Chilina gibbosa, pp. 404-418 in Zootaxa 4948 (3) on page 405, DOI: 10.11646/zootaxa.4948.3.5, http://zenodo.org/record/462915
Parasites of the ‘‘Peladilla", Aplochiton zebra (Osmeriformes: Galaxiidae), from Patagonia (Argentina and Chile)
Full text linkAplochiton zebra is found inhabiting lakes and rivers in Patagonia (Chile and Argentina) and the Malvinas Islands (Falklands Islands). The peladilla is not commercially fished; thus, not much is known about its biology. In previous studies, 7 parasite species were recorded from this fish species. The aim of the present work is to provide new data of A. zebra parasites from surveys in Argentinean Patagonia and to compile the published information from Argentina and Chile. A total of 217 A. zebra from 5 lakes were collected and 15 parasite species were found: 2 Protozoa, 1 Myxozoa, 6 Digenea, 1 Cestoda, 1 Acanthocephala, 3 Nematoda, and 1 Mollusca. This checklist contributes 11 new records of parasites from A. zebra.Fil: Fernández, María Valeria. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte. Instituto de Investigaciones en Biodiversidad y Medioambiente. Universidad Nacional del Comahue. Centro Regional Universidad Bariloche. Instituto de Investigaciones en Biodiversidad y Medioambiente; ArgentinaFil: Semenas, Liliana Graciela. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte. Instituto de Investigaciones en Biodiversidad y Medioambiente. Universidad Nacional del Comahue. Centro Regional Universidad Bariloche. Instituto de Investigaciones en Biodiversidad y Medioambiente; ArgentinaFil: Viozzi, Gustavo Pedro. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte. Instituto de Investigaciones en Biodiversidad y Medioambiente. Universidad Nacional del Comahue. Centro Regional Universidad Bariloche. Instituto de Investigaciones en Biodiversidad y Medioambiente; Argentin
Life cycle of a Posthodiplostomum species (Digenea: Diplostomidae) in Patagonia, Argentina
Full text linkIn Patagonia, populations of the galaxiid fish Galaxias maculatus are parasitized by metacercariae of a species of Posthodiplostomum (Digenea: Diplostomidae). The aim of this work was to describe larval and adult stages of this species in experimental and natural hosts from an Andean Patagonian lake. Specimens of G. maculatus and the pulmonate snail, Anisancylus obliquus, were collected in Patagua Lake. The snails were isolated in individual containers to observe emergence of cercariae, dissected, and examined under a stereoscopic microscope to record sporocysts and cercariae. Fish were examined in order to obtain metacercariae; and uninfected fish from Gutiérrez Lake were exposed to cercariae from A. obliquus to obtain experimental metacercariae. Chicks and mice were infected with metacercariae from naturally infected G. maculatus to obtain experimental adults. Specimens recovered belong to Posthodiplostomum sp. on the basis of morphological features. This is the first description of sporocysts, cercariae, metacercariae and adults stages of a Posthodiplostomum species in Patagonia, including data about its natural intermediate hosts.Fil: Ritossa, Luciano. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Patagonia Norte. Instituto de Investigación en Biodiversidad y Medioambiente; ArgentinaFil: Flores, Verónica Roxana. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Patagonia Norte. Instituto de Investigación en Biodiversidad y Medioambiente; ArgentinaFil: Viozzi, Gustavo Pedro. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Patagonia Norte. Instituto de Investigación en Biodiversidad y Medioambiente; Argentin
Diphyliobothriasis in gulls. Past and present of this zoonosis in the Parque Nacional Nahuel Huapi
No full textFil: Casalins, Laura. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Patagonia Norte. Instituto de Investigación En Biodiversidad y Medioambiente; Argentina. Universidad Nacional del Comahue; ArgentinaFil: Arbetman, Marina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Patagonia Norte. Instituto de Investigación En Biodiversidad y Medioambiente; Argentina. Universidad Nacional de Rio Negro; ArgentinaFil: Semenas, Liliana. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Patagonia Norte. Instituto de Investigación En Biodiversidad y Medioambiente; Argentina. Universidad Nacional del Comahue; ArgentinaFil: Veleizán, Aylén Anabella. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Patagonia Norte. Instituto de Investigación En Biodiversidad y Medioambiente; ArgentinaFil: Flores, Verónica Roxana. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Patagonia Norte. Instituto de Investigación En Biodiversidad y Medioambiente; Argentina. Universidad Nacional del Comahue; ArgentinaFil: Viozzi, Gustavo Pedro. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Patagonia Norte. Instituto de Investigación En Biodiversidad y Medioambiente; Argentina. Universidad Nacional del Comahue; Argentin
The helminth communities structure of Galaxias maculatus (Osmeriformes: Galaxiidae) in different sites of an Argentinean Patagonian lake.
Full text linkLa variación espacial de las comunidades de helmintos en un sistema acuático puede atribuirse a diferentes factores bióticos y abióticos. En América del Sur, este tipo de estudios no se han realizado en ambientes de agua dulce. El lago Nahuel Huapi es el de mayor tamaño dentro del Parque Nacional homónimo, presenta una gran variedad de hábitats y constituye un ambiente ideal para identificar los factores que influyen en las variaciones de las comunidades de helmintos de Galaxias maculatus (puyen chico) en diferentes sitios del lago. Para analizar estas variaciones se muestrearon cinco sitios con diferentes características ambientales, examinándose un total 144 puyenes. Se realizaron análisis comunitarios y se relacionó la composición de las comunidades y la abundancia de las diferentes especies de helmintos con los factores bióticos y abióticos de los diferentes sitios. El tamaño del hospedador, las zonas litorales someras con vegetación acuática y el impacto antrópico fueron factores que determinaron las variaciones en las infracomunidades y comunidades componentes de helmintos que parasitan al pez presa Galaxias maculatus en los diferentes sitios del lago Nahuel Huapi.The spatial variation of helminth communities of an aquatic system can be attributed to different biotic and abiotic factors. In South America, this type of studies has not been conducted in freshwater environments. The lake Nahuel Huapi is the largest within the Nahuel Huapi National Park. As it presents a diversity of habitat, this lake offers an ideal environment to identify factors that impact over the helminth communities of Galaxias maculatus (small puyen) at different sites of the lake. In order to analyze these variations, 144 small puyens were captured in five sites of the lake with different environmental characteristics. Community analyses were performed, and composition of communities and abundance of the different species of helminths were related with biotic and abiotic factors of the different sites. The size of the host, shallow littorals with aquatic vegetation, and anthropic impact were the factors that determined the variations in composition and abundance of the component communities of helminths in the prey fsh Galaxias maculatus from Nahuel Huapi Lake.Fil: Fernández, María Valeria. Universidad Nacional del Comahue; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Patagonia Norte. Instituto de Investigación en Biodiversidad y Medioambiente; ArgentinaFil: Semenas, Liliana. Universidad Nacional del Comahue. Centro Regional Universitario Bariloche. Departamento de Zoologia. Laboratorio de Parasitologia; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Patagonia Norte. Instituto de Investigación en Biodiversidad y Medioambiente; ArgentinaFil: Viozzi, Gustavo Pedro. Universidad Nacional del Comahue. Centro Regional Universitario Bariloche. Departamento de Zoologia. Laboratorio de Parasitologia; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Patagonia Norte. Instituto de Investigación en Biodiversidad y Medioambiente; Argentin
The cephalic lateral line system of temperate perches (Perciformes: Percichthyidae) from Argentinean Patagonia
Full text linkThe species of Percichthys (Percichthyidae) are endemic to southern South America. Some authors have pointed out that the genus includes four valid species, based on the morphology of the head, jaws, and fins. A phylogenetic analysis published by other authors suggests that three of them are morphotypes belonging to the same species, Percichthys trucha (Valenciennes, 1833). The aim of this study is to describe for the first time the morphology of the cephalic seismosensory system of Patagonian perches, and how these characters vary in the three morphotypes, in order to provide morphological elements to analyze the taxonomy of these fish species. Comparisons of the cephalic seismosensory system between juveniles and adults were also conducted. Juvenile and adult specimens were collected in the northwestern Argentinean Patagonia. Specimens were bleached in 5% H2O2 and the canal systems of their cephalic lateral line were filled with hematoxylin. Specimens were deposited in the Museo Argentino de Ciencias Naturales Bernardino Rivadavia, Argentina. The cephalic lateral line of the studied specimens is a widened type of canal systems, is not connected to the trunk lateral line, and consists of preopercular-mandibular canal, infraorbital canal, supraorbital canal, temporal canal, supratemporal canal, and a supraorbital commisure. The number of pores increases during the ontogeny, while their diameters decrease. The number, position and size of infraorbital canal pores showed significant differences among morphotypes and juveniles. The interpopulation variation regarding the number, position, and size of pores seems to signal an ongoing process of speciation, which is the result adaptations to different environmental conditions. Our study contributes to the knowledge of the morphology of percichthids and describes for the first time the seismosensory system of temperate perches.Fil: Vega, Rocío Marisol. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte. Instituto de Investigaciones en Biodiversidad y Medioambiente. Universidad Nacional del Comahue. Centro Regional Universidad Bariloche. Instituto de Investigaciones en Biodiversidad y Medioambiente; ArgentinaFil: Viozzi, Gustavo Pedro. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte. Instituto de Investigaciones en Biodiversidad y Medioambiente. Universidad Nacional del Comahue. Centro Regional Universidad Bariloche. Instituto de Investigaciones en Biodiversidad y Medioambiente; Argentin
Trematodes and nematodes parasitizing the benthic insect community of an Andean Patagonian stream, with emphasis on plagiorchiid metacercariae
Full text linkIn freshwater systems, parasitological studies have mainly been carried out on vertebrates and molluscs, but little is known about parasites of aquatic insects. We describe the trematodes and nematodes parasitizing the benthic insects of an Andean Patagonian stream and the presence of parasites in the terrestrial adult stages. Members of 3 of 20 insect taxa were found to be parasitized by larval nematodes, and members of six taxa harbored metacercariae of digeneans. In benthic samples, chironomids, simuliids (Order Diptera), and baetids (Order Ephemeroptera) harbored mermithid larvae (Nematoda). The stonefly Antarctoperla michaelseni (Order Plecoptera), the caddisfly Smicridea annulicornis (Order Trichoptera), a watersnipe fly (Order Diptera: Athericidae), and three species of leptophlebiid mayflies (Order Ephemeroptera) were parasitized by encysted plagiorchiid metacercariae (Order Plagiorchiida). Most metacercariae were found in the three species of mayflies with prevalences ranging 15-63% and mean intensities ranging 1.2-4.9. Prevalence declined from summer to early winter, probably because of the emergence of infected nymphs and the recruitment of uninfected new cohorts. The imagos had live metacercariae with higher prevalences and intensities of infection than nymphs. We suggest that these plagiorchiids have an allogenic life cycle, involving a terrestrial definitive host. © 2012, The American Microscopical Society, Inc.Fil: Mariluan, Gustavo Darío. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte. Instituto de Investigaciones en Biodiversidad y Medioambiente. Universidad Nacional del Comahue. Centro Regional Universidad Bariloche. Instituto de Investigaciones en Biodiversidad y Medioambiente; ArgentinaFil: Viozzi, Gustavo Pedro. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte. Instituto de Investigaciones en Biodiversidad y Medioambiente. Universidad Nacional del Comahue. Centro Regional Universidad Bariloche. Instituto de Investigaciones en Biodiversidad y Medioambiente; ArgentinaFil: Albariño, Ricardo Javier. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte. Instituto de Investigaciones en Biodiversidad y Medioambiente. Universidad Nacional del Comahue. Centro Regional Universidad Bariloche. Instituto de Investigaciones en Biodiversidad y Medioambiente; Argentin
Dinámica de la infección de sp. (Digenea: Diplostomidae) en el primer y segundo hospedador intermediario de un lago Andino Patagónico (Argentina)
Full text linkIn Argentinean Patagonia, a species of the genus Posthodiplostomum has been reported infectingpopulations of the snail Anisancylus obliquus and the galaxiid fi sh Galaxias maculatus (small puyen), meanwhileadults would develop in piscivorous birds. The aim of the present work was to describe the seasonal dynamicsof this parasite in the intermediate hosts inhabiting a small, shallow Patagonian Andean lake. Samples ofsnails and fi sh from Patagua Lake (40° 46? S - 71º 36? W) were collected monthly from October 2010 to March2011. The larval infection of Posthodiplostomum sp. increases in spring. Snails were infected from Novemberto January, with the highest prevalence in December (8.2%), decreasing in January (3.1%). In fi sh, prevalenceranged between 70% (November) and 100% (December to March). The highest infection values were recordedin larger fi sh, while the small fi sh with sizes less than 40 mm exhibited low infection levels. So, we can infer thatthe life cycle of Posthodiplostomum sp. in Patagonia shows a seasonal pattern, with larval development duringspring, when cercariae emerge from larger snails, resulting in a higher prevalence of fi sh in the littoral.Fil: Ritossa, Luciano. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Patagonia Norte. Instituto de Investigación En Biodiversidad y Medioambiente; Argentina. Universidad Nacional del Comahue; ArgentinaFil: Flores, Verónica Roxana. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Patagonia Norte. Instituto de Investigación En Biodiversidad y Medioambiente; Argentina. Universidad Nacional del Comahue; ArgentinaFil: Viozzi, Gustavo Pedro. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Patagonia Norte. Instituto de Investigación En Biodiversidad y Medioambiente; Argentina. Universidad Nacional del Comahue; Argentin
Nasusbilharzia Flores & Viozzi & Casalins & Loker & Brant 2021, n. gen.
No full textNasusbilharzia n. gen. Type species: Nasusbilharzia melancorhypha n. sp. Etymology: The prefix “ nasus” come from the Latin and refers to the site of infection: the nasal tissue. The suffix “bilharzia” is another name describing a schistosome. Diagnosis: Plathyhelminthes; Trematoda; Digenea; Strigeidida; Schistosomatoidea; Schistosomatidae; Schistosmatinae. Long filamentous worms, somewhat flattened dorso-ventrally. Posterior end of body with blunt termination, not wider than any other part of the body. Oral sucker and ventral sucker present and well developed. Oral sucker terminal. Ventral sucker larger than oral sucker, retractable. Esophagus bifurcating at level of anterior border of ventral sucker. Gynaecophoric canal well-developed starting some distance posterior to ventral sucker. Testes numerous, starting in anterior third of body, posterior to gynaecophoric canal. Cirrus sac present, containing an armed cirrus. Genital pore at anterior end of gynaecophoric canal. Eggs elongated with an asymmetrical median bulge, with slender and curved process in one end.Published as part of Flores, Verónica, Viozzi, Gustavo, Casalins, Laura, Loker, Eric Samuel & Brant, Sara Vanessa, 2021, A new schistosome (Digenea: Schistosomatidae) from the nasal tissue of South America black-necked swans, Cygnus melancoryphus (Anatidae) and the endemic pulmonate snail Chilina gibbosa, pp. 404-418 in Zootaxa 4948 (3) on pages 406-409, DOI: 10.11646/zootaxa.4948.3.5, http://zenodo.org/record/462915
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