Postcyclic Transmission of Leptorhynchoides thecatus and Neoechinorhynchus cylindratus (Acanthocephala) to Largemouth Bass (Micropterus salmoides)

Richardson, Dennis J.; Abdo, Adel

doi:10.1654/4476.1

Cited by 9 publications

(5 citation statements)

References 23 publications

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“…For example, if a fish feeds off an infected ostracod in which the cystacanth is not fully developed (infective), the parasite can migrate to the liver or the mesentery, where it completes its development to the infective cystacanth stage. The fish then acts as a paratenic host, carrying the infected cystacanth to other piscivorous fishes that serve as definitive hosts (Ward, 1940; Richardson and Abdo, 2011).…”

Section: Introductionmentioning

confidence: 99%

Molecular characterization ofNeoechinorhynchus cylindratusVan Cleave, 1913 (Acanthocephala: Neoechinorhynchidae), a parasite of the largemouth bass (Micropterus salmoides) in northern Mexico

García-Varela

Pinacho-Pinacho

2018

J. Helminthol.

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Members of the genus Neoechinorhynchus Stiles & Hassall, 1905 are endoparasites of freshwater fishes, brackish water fishes, and freshwater turtles distributed worldwide. In North America, 33 species have been described. One of the most widely distributed species in the eastern United States and Canada is Neoechinorhynchus (Neoechinorhynchus) cylindratus, a common acanthocephalan that infects centrarchid fishes. In the current study, adult specimens of N. (N) cylindratus were collected from largemouth bass (Micropterus salmoides) from the Purificación River in northern Mexico. In the same freshwater system, two additional congeneric species (Neoechinorhynchus (Neoechinorhynchus) emyditoides and Neoechinorhynchus (Neoechinorhynchus) panucensis) were collected and analysed. Sequences of the large subunit, internal transcribed spacers ITS1 and ITS2, 5.8S from nuclear DNA, and sequences of the cytochrome c oxidase subunit I (cox 1) from mitochondrial DNA were generated and aligned with other sequences obtained from GenBank. Maximum likelihood and Bayesian inference analyses inferred for each dataset showed that N. (N) panucensis, N. (N) emyditoides and N. (N) cylindratus were nested within several clades, indicating that these species do not share a common ancestor. Our phylogenies also revealed that the genus Neoechinorhynchus is paraphyletic, requiring further taxonomic revision using phylogenetic systematics and re-examination of morphological and ecological data. The presence of several N. (N) cylindratus adults in northern Mexico allowed us to typify this species for the first time using a combination of morphological and molecular characteristics. The current record shows a wide distribution range of N. (N) cylindratus across Canada, the United States and Mexico in the Nearctic region.

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Section: Introductionmentioning

confidence: 99%

Molecular characterization ofNeoechinorhynchus cylindratusVan Cleave, 1913 (Acanthocephala: Neoechinorhynchidae), a parasite of the largemouth bass (Micropterus salmoides) in northern Mexico

García-Varela

Pinacho-Pinacho

2018

J. Helminthol.

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“…Following the fate of infections in individual hosts as an important indicator of efficacy of control was also suggested. Using cytochrome c oxidase I as a marker, Betson et al [22] found substantial genetic diversity of S. mansoni within both children less than six years old and their mothers (they examined 1347 parasites from 35 mothers and 45 children) [22] . They did not observe any change in schistosome genetic diversity before or six months after treatment in samples collected from the same individual or from the same family.…”

Section: Introductionmentioning

confidence: 99%

No Apparent Reduction in Schistosome Burden or Genetic Diversity Following Four Years of School-Based Mass Drug Administration in Mwea, Central Kenya, a Heavy Transmission Area

et al. 2014

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BackgroundSchistosomiasis is a debilitating neglected tropical disease that infects over 200 million people worldwide. To combat this disease, in 2012, the World Health Organization announced a goal of reducing and eliminating transmission of schistosomes. Current control focuses primarily on mass drug administration (MDA). Therefore, we monitored transmission of Schistosoma mansoni via fecal egg counts and genetic markers in a typical school based MDA setting to ascertain the actual impacts of MDA on the targeted schistosome population.MethodsFor 4 years, we followed 67 children enrolled in a MDA program in Kenya. Infection status and egg counts were measured each year prior to treatment. For 15 of these children, for which there was no evidence of acquired resistance, meaning they became re-infected following each treatment, we collected microsatellite genotype data from schistosomes passed in fecal samples as a representation of the force of transmission between drug treatments. We genotyped a total of 4938 parasites from these children, with an average of 329.2 parasites per child for the entire study, and an average of 82.3 parasites per child per annual examination. We compared prevalence, egg counts, and genetic measures including allelic richness, gene diversity (expected heterozygosity), adult worm burdens and effective number of breeders among time points to search for evidence for a change in transmission or schistosome populations during the MDA program.FindingsWe found no evidence of reduced transmission or schistosome population decline over the course of the program. Although prevalence declined in the 67 children as it did in the overall program, reinfection rates were high, and for the 15 children studied in detail, schistosome egg counts and estimated adult worm burdens did not decline between years 1 and 4, and genetic diversity increased over the course of drug treatment.InterpretationSchool based control programs undoubtedly improve the health of individuals; however, our data show that in an endemic area, such a program has had no obvious effect on reducing transmission or of significantly impacting the schistosome population as sampled by the children we studied in depth. Results like these, in combination with other sources of information, suggest more integrated approaches for interrupting transmission and significantly diminishing schistosome populations will be required to achieve sustainable control.

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“…El acantocéfalo Neoechinorhynchus cylindratus se recolectó por primera vez en M. salmoides analizados en México; anteriormente se ha reportado de algunos estados de Estados Unidos (i.e. Aliff, Smith, & Lucas, 1977;Richardson & Abdo, 2011), pero nuestro reporte es el primero para México. El hirudineo M. moorei se ha reportado de carpa y bagre de Tamaulipas y Nuevo León (Galaviz-Silva, Witt-Sepulveda Mercado-Hernández, & Martínez-Hernández, 1990).…”

Section: Discussionunclassified

“…En el área de estudio convergen tres diferentes provincias fisiográficas: a) La Llanura Costera de Norteamérica y b) la Llanura Costera del Golfo Norte, ambas ubicadas al norte y este central, respectivamente en la frontera con Tamaulipas) y c) la sierra Madre Oriental, al este y delimitando con el estado de Coahuila, lo que permite la existencia de una amplia biodiversidad y riqueza de especies acuáticas, sin embargo, son escasas las publicaciones oficiales sobre la helmintofauna en peces (Pérez-Ponce de León, G., Rosas-valdez, R., Aguilar-Aguilar, R., Mendoza-Garfias, B., Mendoza-Palmero, … Domínguez-Domínguez, 2010; Pérez-Ponce de León, García, León, & Choudhury, 2000;Salgado-Maldonado, 2006) pues en la Cuenca del Rio Bravo ha sido reportado únicamente un estudio sobre metazoarios parásitos de M. salmoides (Aguilar-Aguilar, Martínez-Aquino, Espinosa-Pérez, & Pérez-Ponce de León, 2014), en comparación con las numerosas contribuciones disponible en los Estados Unidos de Norteamerica (USA) donde un número substancial de casi todos los taxa (monogeneos, tremátodos, céstodos, nemátodos, acantocéfalos, copépodos) de parásitos han sido reportados (i.e. Lane, Spier, Wiederholt, & Meagher, 2014;McGee, Whitney, & Heckmann, 2001;Mizelle & Crane, 1964;Richardson & Abdo, 2011). Esta enorme diferencia dificulta el desarrollo de estrategias ecológicamente sustentables para implementar medidas profilácticas de control de enfermedades parasitarias que preserven este importante recurso.…”

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Metazoarios parásitos del robalo Micropterus salmoides (Perciformes: Centrarchidae) de presas de Nuevo León, México y su asociación con el factor de condición y sexo

Galaviz‐Silva

Escobar

Iruegas

et al. 2016

RBT

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Metazoan parasites of Micropterus salmoides (Centrarchidae: Perciformes) from reservoirs of Nuevo León, México and their association with condition factor and gender. The largemouth bass Micropterus salmoides is a very valuable fish species for aquaculture and sport fishing; however, there are no systematic studies on fish metazoan parasites in Mexico. The main objective of the present study was to describe the prevalence, abundance, and intensity of M. salmoides metazoan parasites, and their association with fish condition factor and gender. The sample size was composed by 672 hosts, collected between 2011-2013 from the following reservoirs of Nuevo Leon, México: Rodrigo Gómez dam ("La Boca", LB), Cuchillo-Solidaridad dam (CS), Salinillas lagoon (LS), Mariano Escobedo dam ("Sombreretillo", S), and José López Portillo dam ("Cerro Prieto", CP). Living fish were transported to the laboratory; sizes and weights were then recorded to calculate the Fulton condition factor (k). If possible, gender was also recorded. Parasites were detected under stereoscopy, recollected and preserved by traditional techniques. Statistical analysis of association between parasitic load, gender, and Fulton condition factor were calculated, using the X 2 and the Student-t tests. Results showed that 12 different metazoans were identified, two flukes (Posthodiplostomum minimum centrarchi and Phyllodistomum pearsei), one tapeworm (Proteocephalus ambloplitis), three roundworms (Contracaecum sp., Spinitectus carolini and Philometra nodulosa), two acantocephalan (Neoechinorhynchus cylindratus and Arhythmorhynchus sp.), one leech (Myzobdella moorei), and three copepods (Ergasilus versicolor; Ergasilus arthrosis and Ergasilus cerastes). HSD Tukey test showed that infected fish from LB were significantly different than LS, CS, CP, and S (P<0.05). Parasites most commonly collected in all five locations were P. m. centrarchi, Contracaecum sp. and E. versicolor. The frequency of P. m. centrarchi was highly significant (P<0.001) than other parasites; furthermore, this parasite showed the highest prevalence (97.5 %), abundance (10.12-83.6), and intensity (15.44-88.5). Statistical dependence was found between intensity and abundance of metazoans with regard to female gender and size on five reservoirs (t=143.82, P=0.0001; t=2.6, P=0.01, respectively). In addition, the abundance and intensity showed statistical dependence with regard to k, which was proportionally significant.

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Postcyclic Transmission of Leptorhynchoides thecatus and Neoechinorhynchus cylindratus (Acanthocephala) to Largemouth Bass (Micropterus salmoides)

Cited by 9 publications

References 23 publications

Molecular characterization ofNeoechinorhynchus cylindratusVan Cleave, 1913 (Acanthocephala: Neoechinorhynchidae), a parasite of the largemouth bass (Micropterus salmoides) in northern Mexico

Molecular characterization ofNeoechinorhynchus cylindratusVan Cleave, 1913 (Acanthocephala: Neoechinorhynchidae), a parasite of the largemouth bass (Micropterus salmoides) in northern Mexico

No Apparent Reduction in Schistosome Burden or Genetic Diversity Following Four Years of School-Based Mass Drug Administration in Mwea, Central Kenya, a Heavy Transmission Area

Metazoarios parásitos del robalo Micropterus salmoides (Perciformes: Centrarchidae) de presas de Nuevo León, México y su asociación con el factor de condición y sexo

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