scholarly journals Helminth communities from amphibians inhabiting agroecosystems in the Pampean Region (Argentina)

2020 ◽  
Vol 127 (2) ◽  
Author(s):  
Regina Draghi ◽  
Fabiana B. Drago ◽  
Pablo E. Saibene ◽  
M. Gabriela Agostini
Keyword(s):  
Pampean Region ◽  
Helminth Communities

scholarly journals Pleistocene Mammals from Pampean Region (Argentina). Biostratigraphic, Biogeographic, and Environmental Implications

Quaternary ◽  
2021 ◽  
Vol 4 (2) ◽  
pp. 15
Author(s):  
José Luis Prado ◽  
María Teresa Alberdi ◽  
Jonathan Bellinzoni
Keyword(s):  
South America ◽  
The State ◽  
Historical Study ◽  
South American ◽  
Environmental Implications ◽  
Sedimentary Sequences ◽  
Pampean Region ◽  
Mammalian Faunas ◽  
Pleistocene Mammals ◽  
Fossil Records

The Pampean Region contains sedimentary sequences with abundant mammal fossil records, which constitute the chronological outline of the Plio–Pleistocene of South America. These classic localities have been used for more than a century to correlate with other South American regions. Throughout this time, a series of misinterpretations have appeared. To understand the stratigraphic significance of these localities and the geochronological situation of each unit referring to the Pleistocene, a critical historical study of the antecedents was carried out, evaluating the state of each unit. The biostratigraphic studies of the Pampean Region’s mammalian faunas improved the understanding of biogeographic changes taking into account the environmental fluctuations of the Pleistocene.

Helminth Parasite Communities of the Water-rat, Hydromys chrysogaster, from Queensland

1997 ◽  
Vol 24 (4) ◽  
pp. 445 ◽  
Author(s):  
L. R. Smales ◽  
T. H. Cribb
Keyword(s):  
Bimodal Distribution ◽  
Helminth Fauna ◽  
Helminth Community ◽  
Parasite Communities ◽  
Far North ◽  
Core Species ◽  
Helminth Communities ◽  
Eastern Australia ◽  
Hydromys Chrysogaster ◽  
High Diversity

The helminth fauna from 124 water-rats, Hydromys chrysogaster, collected from 33 localities in Queensland was analysed. A total of 45 species of helminths was found, comprising 2 acanthocephalans, 2 cestodes, 13 nematodes and 28 trematodes. The helminth community of the water-rats in the region north of latitude 18˚ (far north) was different from that of water-rats south of 18˚ (central); Sorensen’s Index 45·8% similarity, whereas Holmes and Podesta’s Index gave 32·1% similarity. Comparisons with data from water-rats from southern and Tasmanian regions showed that they were different from each other and from both Queensland regions. The helminth communities were characterised by high diversity, dominated by trematodes in the central and Tasmanian regions, but with nematodes becoming more prominent in the far northern and southern regions. No core or secondary species were found in the Queensland helminth communities, the southern community was suggestive of a bimodal distribution and the Tasmanian had two core species. A checklist of helminth species occurring in water-rats from eastern Australia is provided.

scholarly journals Museum metabarcoding: A novel method revealing gut helminth communities of small mammals across space and time

2018 ◽  
Vol 48 (13) ◽  
pp. 1061-1070 ◽  
Author(s):  
Stephen E. Greiman ◽  
Joseph A. Cook ◽  
Vasyl V. Tkach ◽  
Eric P. Hoberg ◽  
Damian M. Menning ◽  
...  
Keyword(s):  
Small Mammals ◽  
Space And Time ◽  
Helminth Communities ◽  
Novel Method

Adsorption of metsulfuron-methyl on soils under no-till system in semiarid Pampean Region, Argentina

Geoderma ◽  
2009 ◽  
Vol 149 (1-2) ◽  
pp. 110-115 ◽  
Author(s):  
Graciela P. Zanini ◽  
Carolina Maneiro ◽  
Carolina Waiman ◽  
Juan A. Galantini ◽  
Ramón A. Rosell
Keyword(s):  
Metsulfuron Methyl ◽  
Pampean Region ◽  
No Till

Helminth communities ofNectomys squamipesnaturally infected by the exotic trematodeSchistosoma mansoniin southeastern Brazil

2006 ◽  
Vol 80 (4) ◽  
pp. 369-375 ◽  
Author(s):  
A. Maldonado Júnior ◽  
R. Gentile ◽  
C.C. Fernandes-Moraes ◽  
P.S. D'Andrea ◽  
R.M. Lanfredi ◽  
...  
Keyword(s):  
Schistosoma Mansoni ◽  
Endemic Area ◽  
Dominant Species ◽  
Helminth Species ◽  
Southeastern Brazil ◽  
Infection Rates ◽  
Cestode Species ◽  
Intensity Of Infection ◽  
Helminth Communities ◽  
Subadult Female

AbstractThe water ratNectomys squamipesis endemic in Brazil and found naturally infected withSchistosoma mansoni. Helminth communities, their prevalences, intensity of infection and abundance inN. squamipesin an endemic area of schistosomiasis in the state of Rio de Janeiro, Brazil were studied. Four species of nematodes (Physaloptera bispiculata, Syphacia venteli,Hassalstrongylus epsilonandLitomosoides chagasfilhoi) were recovered in 85.3%, two trematodes (Schistosoma mansoniandEchinostoma paraensei) in 38.8% and one cestode species (Raillietinasp.) in 1.7% of rats examined. Rats were infected with up to five helminth species each, and these were highly aggregated in distribution. ForH. epsilonandS. venteli, intensities and abundances were higher in adult male and subadult female hosts, respectively.Hassaltrongylus epsilon,P. bispiculata,S. venteliandS. mansoniwere classified as dominant species,L. chagasfilhoiandE. paraenseias co-dominant andRaillietinasp. as subordinated. No significant correlation was found in the intensity of infecton between each pair of helminth species.Schistosoma mansoniwas not related to any other helminth species according to their infection rates, althougthS. mansoniwas well established in the natural helminth comunity of the water rat.

Site selection by parasitic helminths: interspecific interactions, site segregation, and their importance to the development of helminth communities

1973 ◽  
Vol 51 (3) ◽  
pp. 333-347 ◽  
Author(s):  
John C. Holmes
Keyword(s):  
Site Selection ◽  
Interspecific Interactions ◽  
Biotic Interactions ◽  
Site Specificity ◽  
Short Term ◽  
Parasitic Helminths ◽  
Niche Specialization ◽  
Helminth Communities ◽  
Niche Diversification

That parasites actively select specific sites in their hosts is well known. Some parasites respond to changing conditions within the host by making diel or other short-term migrations, which may be modified by the presence of other parasites.Evidence is presented to support the hypothesis that continued interactions between parasites lead to niche diversification, and that site segregation, and consequently narrow site specificity, is an important part of niche specialization. The paucity of cases of interactive site segregation as compared with those of genetically stabilized selective site segregation suggests that parasite faunas are mature communities, the diversity of which has been established to an important extent through biotic interactions.

scholarly journals Structure in parasite component communities in wild rodents: predictability, stability, associations and interactions .... or pure randomness?

Parasitology ◽  
2008 ◽  
Vol 135 (7) ◽  
pp. 751-766 ◽  
Author(s):  
J. M. BEHNKE
Keyword(s):  
Species Richness ◽  
Published Data ◽  
Data Sets ◽  
Wild Rodents ◽  
Heligmosomoides Polygyrus ◽  
Wood Mice ◽  
Core Species ◽  
Helminth Communities ◽  
Immune Mediated ◽  
Concurrent Infections

SUMMARYExperimental data establish that interactions exist between species of intestinal helminths during concurrent infections in rodents, the strongest effects being mediated through the host's immune responses. Detecting immune-mediated relationships in wild rodent populations has been fraught with problems and published data do not support a major role for interactions in structuring helminth communities. Helminths in wild rodents show predictable patterns of seasonal, host age-dependent and spatial variation in species richness and in abundance of core species. When these are controlled for, patterns of co-infection compatible with synergistic interactions can be demonstrated. At least one of these, the positive relationship betweenHeligmosomoides polygyrusand species richness of other helminths has been demonstrated in three totally independent data-sets. Collectively, they explain only a small percentage of the variance/deviance in abundance data and at this level are unlikely to play a major role in structuring helminth communities, although they may be important in the more heavily infected wood mice. Current worm burdens underestimate the possibility that earlier interactions through the immune system have taken place, and therefore interactions may have a greater role to play than is immediately evident from current worm burdens. Longitudinal studies are proposed to resolve this issue.

scholarly journals ESTUDIO PRELIMINAR DE LA VARIABILIDAD INTRAESPECÍFICA DE PROTEÍNAS SEMINALES EN Araujia hortorum FOURN (Apocynaceae).

2019 ◽  
pp. 28-31
Keyword(s):  
Polyacrylamide Gel Electrophoresis ◽  
Seed Proteins ◽  
Intraspecific Variability ◽  
Genetic Uniformity ◽  
Climbing Plant ◽  
Pampean Region ◽  
Natural Reserve ◽  
Palabras Clave ◽  
Small Intensity ◽  
Para Determinar

ESTUDIO PRELIMINAR DE LA VARIABILIDAD INTRAESPECÍFICA DE PROTEÍNAS SEMINALES EN Araujia hortorum FOURN (Apocynaceae). PRELIMINAR STUDY OF THE INTRASPECIFIC VARIABILITY OF SEED PROTEINS IN Araujia hortorum FOURN (Apocynaceae) Gonzales Medrano, M.F, Galvez, M.J , González, S.R y Villamil, C.B DOI: https://doi.org/10.33017/RevECIPeru2006.0016/ RESUMEN Araujia hortorum Fourn es una enredadera perenne sudamericana que se comporta como invasora en cultivos y en áreas de reserva natural. Han habido controversias sobre la conveniencia de considerarla como especie independiente o como entidad infraespecífica subordinada a A. sericifera Brot. (Araujia sericifera f. hortorum Malme). Como criterio complementario para definir esta situación se han comparado muestras de semillas provenientes de nueve poblaciones de la región pampeana argentina (A. cf. hortorum) y una coleccionada en la selva misionera (A. cf. sericifera). Mediante la utilización de los métodos de electroforesis en gel de poliacrilamida (PAGE-SDS) y de inmunotransferencia (IT, “immunoblotting”) se ha podido detectar la presencia de 19 y 18 bandas proteicas respectivamente, aunque no coincidentes entre sí. La utilización del Índice de Jaccard arrojó valores de similitud entre 0.39-1.00 y 0.53-1.00 respectivamente. Las diferencias encontradas deben atribuirse, en parte, a la dificultad para determinar la presencia o ausencia de algunas de las bandas de menor intensidad. La población misionera mostró menor similitud con las pampeanas que éstas entre sí. Los resultados obtenidos demuestran una considerable uniformidad genética entre ambas entidades putativas, lo que sugiere la necesidad de comparar poblaciones adicionales de ambas para evaluar más objetivamente la consistencia de estos métodos en su caracterización sistemática. Palabras clave: Inmunotransferencia, Araujia, proteínas seminales, Apocynaceae. ABSTRACT Araujia hortorum Fourn is a sudamerican perennial climbing plant that performs like an invasive in crops and natural reserve areas. There have been controversies about to consider it as independent specie or like an intraspecific entity dependent to A. sericifera Brot. (Araujia sericifera f. hortorum Malme). As a complement approach to define its situation, It has been compared some seeds samples coming from nine populations from Argentina‟s pampean region (A. cf. hortorum) and another from Misionera jungle (A. cf. sericifera). through use the method of polyacrylamide gel electrophoresis (PAGE-SDS) and immnunoblot assay (IT, “immunoblotting”), it have been able to detect the presence of 19 and 18 protein bands respectively, although they are not coincident to each other. The use of the Jaccard Index shows values of similarity among 0.39-1.00 and 0.53-1.00, respectively. Differences should be attributed, partly, to the difficulty to determine the presence or absence of some of the bands of small intensity. The population from Misionera jungle showed smaller similarity with the pampeans that between each other. The results realized a considerable genetic uniformity among both putative entities that suggests the necessity to compare both additional populations in order to evaluate the consistency of these methods more objectively in their systematic characterization. Keywords: Immunoblotting, Araujia, seeds proteins, Apocynaceae.

scholarly journals Helminth communities of loggerhead turtles (Caretta caretta) from Central and Western Mediterranean Sea: The importance of host's ontogeny

2010 ◽  
Vol 59 (3) ◽  
pp. 367-375 ◽  
Author(s):  
Mario Santoro ◽  
Francisco J. Badillo ◽  
Simonetta Mattiucci ◽  
Giuseppe Nascetti ◽  
Flegra Bentivegna ◽  
...  
Keyword(s):  
Mediterranean Sea ◽  
Caretta Caretta ◽  
Western Mediterranean ◽  
Western Mediterranean Sea ◽  
Helminth Communities ◽  
Loggerhead Turtles
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