On two species of Ichthyouris (Nematoda: Pharyngodonidae) parasites of Mesonauta festivus (Pisces: Cichlidae) in the Brazilian Amazon region

Cárdenas, Melissa Querido; Fernandes, Berenice M. M.; Malta, José Celso de Oliveira; Porto, Daniel Brito; Morais, Aprigio Mota

doi:10.22201/ib.20078706e.2018.3.2397

Cited by 3 publications

(1 citation statement)

References 6 publications

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“…M. festivus , a detritivore cichlid ubiquitous to the Amazon basin, was chosen as the model organism since it has a high environmental tolerance to environmental variations such as drastically contrasting abiotic conditions between black and white waters ( 43 ). In addition, parasitic infections by nematodes have previously been reported in wild specimens of M. festivus ( 44 ), and the species has important parental care investment, staying with fingerlings post hatching ( 43 ). Finally, in terms of genetic diversity, the four populations of M. festivus recorded in Amazonia are not structured according to the water physicochemical characteristics ( 45 ), therefore, making this species model suitable to disentangle environmental versus genetic effect on microbiota composition.…”

Section: Introductionmentioning

confidence: 99%

Gut microbiota of an Amazonian fish in a heterogeneous riverscape: integrating genotype, environment, and parasitic infections

Leroux,

Sylvain,

Holland

et al. 2023

Microbiol Spectr

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A number of key factors can structure the gut microbiota of fish such as environment, diet, health state, and genotype. Mesonauta festivus , an Amazonian cichlid, is a relevant model organism to study the relative contribution of these factors on the community structure of fish gut microbiota. M. festivus has well-studied genetic populations and thrives in rivers with drastically divergent physicochemical characteristics. Here, we collected 167 fish from 12 study sites and used 16S and 18S rRNA metabarcoding approaches to characterize the gut microbiome structure of M. festivus . These data sets were analyzed in light of the host fish genotypes (genotyping-by-sequencing) and an extensive characterization of environmental physico-chemical parameters. We explored the relative contribution of environmental dissimilarity, the presence of parasitic taxa, and phylogenetic relatedness on structuring the gut microbiota. We documented occurrences of Nyctotherus sp. infecting a fish and linked its presence to a dysbiosis of the host gut microbiota. Moreover, we detected the presence of helminths which had a minor impact on the gut microbiota of their host. In addition, our results support a higher impact of the phylogenetic relatedness between fish rather than environmental similarity between sites of study on structuring the gut microbiota for this Amazonian cichlid. Our study in a heterogeneous riverscape integrates a wide range of factors known to structure fish gut microbiomes. It significantly improves understanding of the complex relationship between fish, their parasites, their microbiota, and the environment. IMPORTANCE The gut microbiota is known to play important roles in its host immunity, metabolism, and comportment. Its taxonomic composition is modulated by a complex interplay of factors that are hard to study simultaneously in natural systems. Mesonauta festivus , an Amazonian cichlid, is an interesting model to simultaneously study the influence of multiple variables on the gut microbiota. In this study, we explored the relative contribution of the environmental conditions, the presence of parasitic infections, and the genotype of the host on structuring the gut microbiota of M. festivus in Amazonia. Our results highlighted infections by a parasitic ciliate that caused a disruption of the gut microbiota and by parasitic worms that had a low impact on the microbiota. Finally, our results support a higher impact of the genotype than the environment on structuring the microbiota for this fish. These findings significantly improve understanding of the complex relationship among fish, their parasites, their microbiota, and the environment.

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Section: Introductionmentioning

confidence: 99%

Gut microbiota of an Amazonian fish in a heterogeneous riverscape: integrating genotype, environment, and parasitic infections

Leroux,

Sylvain,

Holland

et al. 2023

Microbiol Spectr

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Checklist of nematodes parasitizing fish in the Brazilian Amazon

et al. 2021

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A New Species of Ichthyouris Inglis, 1968 (Nematoda: Pharyngodonidae) Parasitizing Two Characiform Fishes from Tocantins River, Maranhão State, Brazil

Cárdenas

Fernandes

Justo

et al. 2019

Comparative Parasitology

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A new oxyuroid nematode, Ichthyouris nunani n. sp., is described from the intestine of the freshwater benthopelagic characiform fishes Laemolyta taeniata and Curimata acutirostris, both of which were caught in the Tocantins River, State of Maranhão, Brazil. The new species is easily distinguished from all other species of the genus mainly because of the distribution of the male caudal papillae, the morphology of the spicule, and the fact that the eggs have an operculum and many long, thread-like filaments at each pole. This is the first helminth species described in both hosts, and this report contributes to the knowledge of the helminthological fauna of fish in the Neotropical region.

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On two species of Ichthyouris (Nematoda: Pharyngodonidae) parasites of Mesonauta festivus (Pisces: Cichlidae) in the Brazilian Amazon region

Cited by 3 publications

References 6 publications

Gut microbiota of an Amazonian fish in a heterogeneous riverscape: integrating genotype, environment, and parasitic infections

Gut microbiota of an Amazonian fish in a heterogeneous riverscape: integrating genotype, environment, and parasitic infections

Checklist of nematodes parasitizing fish in the Brazilian Amazon

A New Species of Ichthyouris Inglis, 1968 (Nematoda: Pharyngodonidae) Parasitizing Two Characiform Fishes from Tocantins River, Maranhão State, Brazil

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