Infections by Helminth Parasites in "Puyenes", Galaxias maculatus (Galaxiidae, Salmoniformes), from Southern Argentina with special reference to Tylodelphys barilochensis (Digenea, Platyhelminthes)

Revenga, Jorge E.; Scheinert, P

doi:10.1590/s0074-02761999000500007

Cited by 7 publications

(3 citation statements)

References 9 publications

(8 reference statements)

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“…The lack of IBD pattern within Nahuel Huapi Lake suggests that larvae coming from different spawning sites mix in the limnetic zone and no homing behaviour occurs among the juveniles. The movement of G. maculatus adult individuals within this lake does not appear to be restricted, as previously suggested by parasitological evidence (Revenga & Scheinert, ; Revenga, ). Interestingly, if adults in Nahuel Huapi Lake are assumed sedentary (Revenga & Scheinert, ), our results suggest that the limnetic larvae might have an important dispersive role for resident G. maculatus populations .…”

Section: Discussionsupporting

confidence: 81%

“…The movement of G. maculatus adult individuals within this lake does not appear to be restricted, as previously suggested by parasitological evidence (Revenga & Scheinert, ; Revenga, ). Interestingly, if adults in Nahuel Huapi Lake are assumed sedentary (Revenga & Scheinert, ), our results suggest that the limnetic larvae might have an important dispersive role for resident G. maculatus populations . Under this scenario, larval movements thus exert a homogenizing effect on the distribution of genetic variance in G. maculatus within Nahuel Huapi Lake that, ultimately, can constrain the potential for local adaptation.…”

Section: Discussionsupporting

confidence: 81%

“…In the present study, we focused on a system of four postglacial lakes in north‐western Patagonia differing in size and connectivity: Lake Nahuel Huapi, which is a large lake (583 km 2 ) with a winding shoreline, many bays, and peninsulas that favour the existence of different microhabitats, as well as three smaller lakes that connect to it: Correntoso, Redonda, and Larga lakes. Galaxias maculatus within the Nahuel Huapi Lake have been inferred to exhibit fine scale spatial structure on the basis of qualitative (taxonomic) and quantitative differences in the parasite content among adult specimens collected from sites at most 40 km apart (Revenga & Scheinert, ). The present study aimed to examine how G. maculatus genetic and phenotypic variability is distributed geographically within and among the lakes in this system.…”

Section: Introductionmentioning

confidence: 99%

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Genetic and phenotypic differentiation among Galaxias maculatus populations in a Patagonian postglacial lake system

Carrea

Barriga

Cussac

et al. 2012

Biol J Linn Soc Lond

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Understanding the influence of landscape features on population differentiation is fundamental to evolutionary biology studies. We examined spatial patterns of genetic and phenotypic variability among Galaxias maculatus populations in a complex of four postglacial lakes in northwestern Patagonia differing in size and connectivity among them. A hierarchical Bayesian analysis grouped the individuals collected from eleven localities into three genetic clusters, first defining the populations of the two large lakes and separating the two small lakes in subsequent analysis. Genetic structuring was restricted within large lakes. It is known that the larval stage of Galaxias maculatus migrate to the limnetic zone of Patagonian lakes, possibly exerting an homogenizing effect on gene flow within lakes. Gene flow asymmetry and divergences among lakes can be explained by a combination of landscape characteristics and the presence of predators in the short streams that connect them. Individuals from the small lakes are the most divergent morphologically and genetically. The population in the isolated Redonda Lake, exhibits meristic differences as well, suggesting strong drift and environmental effects. This population is likely to have been isolated following the decline in water level of a paleolake that existed in this region approximately 13.2 kya BP. © 2012 The Linnean Society of London, Biological Journal of the Linnean Society, 2012, ••, ••–••.

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Section: Discussionsupporting

confidence: 81%

Section: Discussionsupporting

confidence: 81%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Genetic and phenotypic differentiation among Galaxias maculatus populations in a Patagonian postglacial lake system

Carrea

Barriga

Cussac

et al. 2012

Biol J Linn Soc Lond

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Geographic variation in composition of metazoan parasite infracommunities in Galaxias maculatus Jenyns 1842 (Osmeriformes: Galaxiidae) in southern Chile (38-47° S)

George-Nascimento

López-Rodríguez

Górski

2020

Rev. Chil. de Hist. Nat.

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Galaxias maculatus is an abundant freshwater fish species in Chilean continental waters where it plays important ecological functions, yet few parasitological records of this species exist in Chile and all of them cover a very limited geographic range. The objective of this study was to assess large scale geographic variation in composition of parasite infracommunities of Galaxias maculatus. Specifically, parasite infracommunities of this species were compared among 11 locations across 9 degrees of latitude and 3 ecosystem types (lake, river and estuary). Most taxa found had been previously reported in Chile and Argentina. However, this is the first report for Tylodelphys sp. in this host in Chile. Furthermore, the cranial parasite Tylodelphys sp. had the highest overall prevalence and abundance compared to other parasite species. Despite the fact that the abundance of Tylodelphys sp. was not significantly correlated with Fulton's condition factor of fish, infected fish seem to have a better body condition compared to uninfected ones. The most important source of variation in composition of infracommunities was the sampling location. Furthermore, fish from lakes have a different composition of parasite infracommunities mainly due to higher abundances of Tylodelphys sp.

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Ailinella mirabilis gen. n., sp. n. (Eucestoda: Pseudophyllidea) from Galaxias maculatus (Pisces: Galaxiidae) in the Andean-Patagonian region of Argentina

Pertierra¹,

Semenas²

2006

FOLIA PARASIT

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Ailinella gen. n. (Pseudophyllidea: Triaenophoridae) is proposed to accommodate Ailinella mirabilis sp. n. from Galaxias maculatus (Jenyns, 1842), a freshwater fish inhabiting the Andean lakes in Argentinean Patagonia. Ailinella belongs to the Triaenophoridae because it has a marginal genital pore, a follicular vitelline gland, and a ventral uterine pore. The new genus can be distinguished from other triaenophorids by the following combination of characters: a small body size, a low number of proglottides, which are longer than wide, a truncated pyramidal to globular scolex, a rectangular apical disc, presence of the neck, lack of internal longitudinal musculature separating the cortex from the medulla, testes distributed in one central field surrounding the ovary laterally and posteriorly, the vagina predominantly anterior to the cirrus sac, vitelline follicles circum-medullary, the genital pores post-equatorial, a saccate uterus, and operculate eggs. Blade-like spiniform microtriches were present on all tegument surfaces, and tumuli on all surfaces of the scolex and the anterior surface of the neck. Microtriches were characterized according to their size and density, and tumuli according to their size, inter-tumulus distance and density. Ailinella mirabilis is the first cestode described from G. maculatus and the second triaenophorid species recorded from a South American freshwater fish.

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Infections by Helminth Parasites in "Puyenes", Galaxias maculatus (Galaxiidae, Salmoniformes), from Southern Argentina with special reference to Tylodelphys barilochensis (Digenea, Platyhelminthes)

Cited by 7 publications

References 9 publications

Genetic and phenotypic differentiation among Galaxias maculatus populations in a Patagonian postglacial lake system

Genetic and phenotypic differentiation among Galaxias maculatus populations in a Patagonian postglacial lake system

Geographic variation in composition of metazoan parasite infracommunities in Galaxias maculatus Jenyns 1842 (Osmeriformes: Galaxiidae) in southern Chile (38-47° S)

Ailinella mirabilis gen. n., sp. n. (Eucestoda: Pseudophyllidea) from Galaxias maculatus (Pisces: Galaxiidae) in the Andean-Patagonian region of Argentina

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