Infectivity of chordodes nobilii larvae (Gordiida: Nematomorpha)

The gordiids are freshwater representatives of the parasite phylum Nematomorpha that function as a link between aquatic and terrestrial ecosystems. In recent years, different ecotoxicologic studies have been made with the South-American gordiid species, Chordodes nobilii, that have demonstrated the...

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Detalles Bibliográficos
Autores principales: Achiorno, Cecilia Luján, Villalobos, Leonor Cristina de, Ferrari, Lucrecia
Formato: Articulo
Lenguaje:Inglés
Publicado: 2017
Materias:
Biología
Female
Infection index mean abundance
Infective capacity
Nematomorpha
Parasite
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/87384
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-87384
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Biología
Female
Infection index mean abundance
Infective capacity
Nematomorpha
Parasite
spellingShingle Biología
Female
Infection index mean abundance
Infective capacity
Nematomorpha
Parasite
Achiorno, Cecilia Luján
Villalobos, Leonor Cristina de
Ferrari, Lucrecia
Infectivity of chordodes nobilii larvae (Gordiida: Nematomorpha)
topic_facet Biología
Female
Infection index mean abundance
Infective capacity
Nematomorpha
Parasite
description The gordiids are freshwater representatives of the parasite phylum Nematomorpha that function as a link between aquatic and terrestrial ecosystems. In recent years, different ecotoxicologic studies have been made with the South-American gordiid species, Chordodes nobilii, that have demonstrated the capacity of this group to act as a bioindicator of contamination. Despite the Gordiida’s ecologic relevance, further studies are still needed to elucidate different aspects of the biology of the class, and among those, the infective capacity, a parameter that can be evaluated by the infection index mean abundance (IIMA). A knowledge of the intrinsic variability in the infective capacity of C. nobilii would warrant priority in order to establish, the range of acceptable responses for normal or standard conditions in the laboratory, and, to compare the criteria among different assays. The objective of this study was to establish a baseline value for the infective capacity for C. nobilii larvae, under controlled laboratory conditions, by employing the IIMA as the evaluation parameter. To that end, we analyzed the infective capacity of C. nobilii larvae that had hatched from different strings of eggs laid in the laboratory by a total of 12 females. The C. nobilii adults were collected from streams within the Argentina Sauce Grande basin, between 2006 and 2009. Once in the laboratory, after mating, the females were placed in individual containers for oviposition. The egg strings obtained from each female were cut in 3 mm long segments; and when free larvae were observed, the segments (N= 90) were placed together with 30 Aedes aegypti larvae for evaluation of the gordiids’ infective capacity. After 72 h, the mosquito larvae were observed by microscopy in order to quantify the C. nobilii larvae in body cavities. The IIMAs were calculated as the total number of C. nobilii larvae present divided by total number of A. aegypti larvae examined. For analysis of the IIMAs obtained, the data were grouped according to the female who made the original ovoposition. Our results enabled the corroboration of an ample range of responses in the infective capacity of this species, a characteristic that would normally be linked to the progenitors originating the hatch. Because this relationship prevents the establishment of a baseline for making comparisons among assays with gordiids, through the IIMA as a response parameter, we recommend expressing the IIMA values in each assay relative to their respective controls. These findings also provide evidence for the greater success in infections by certain members of the progeny over others. Finally, on the basis of the results obtained from this study, we stress the relevance of the use of the IIMA as a decisive aspect to be considered in different studies on the biology of Gordiida. © 2017, Universidad de Costa Rica. All rights reserved.
format Articulo
Articulo
author Achiorno, Cecilia Luján
Villalobos, Leonor Cristina de
Ferrari, Lucrecia
author_facet Achiorno, Cecilia Luján
Villalobos, Leonor Cristina de
Ferrari, Lucrecia
author_sort Achiorno, Cecilia Luján
title Infectivity of chordodes nobilii larvae (Gordiida: Nematomorpha)
title_short Infectivity of chordodes nobilii larvae (Gordiida: Nematomorpha)
title_full Infectivity of chordodes nobilii larvae (Gordiida: Nematomorpha)
title_fullStr Infectivity of chordodes nobilii larvae (Gordiida: Nematomorpha)
title_full_unstemmed Infectivity of chordodes nobilii larvae (Gordiida: Nematomorpha)
title_sort infectivity of chordodes nobilii larvae (gordiida: nematomorpha)
publishDate 2017
url http://sedici.unlp.edu.ar/handle/10915/87384
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