Effects of the cranial parasite Tylodelphys sp. (Digenea: Diplostomidae) on the behavior and physiology of puye Galaxias maculatus (Osmeriformes: Galaxiidae)

Diplostomatid digeneans that inhabit the eye lens of its fish second intermediate hosts are wellknown manipulators of behaviour of their hosts. They can cause cataracts that may render their host fish to be more prone to be preyed upon by bird definitive hosts. Diplostomatids such as Tylodelphys sp....

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Detalles Bibliográficos
Autor: López-Rodríguez, Ruby
Tipo de recurso: tesis de maestría
Estado:Versión publicada
Fecha de publicación:2019
País:Chile
OAI Identifier:oai:repositorio.anid.cl:10533/253197
Acceso en línea:https://hdl.handle.net/10533/253197
Access Level:acceso abierto
Palabra clave:Ciencias Naturales
Otras Ciencias Naturales
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dc.title.es_CL.fl_str_mv Effects of the cranial parasite Tylodelphys sp. (Digenea: Diplostomidae) on the behavior and physiology of puye Galaxias maculatus (Osmeriformes: Galaxiidae)
title Effects of the cranial parasite Tylodelphys sp. (Digenea: Diplostomidae) on the behavior and physiology of puye Galaxias maculatus (Osmeriformes: Galaxiidae)
spellingShingle Effects of the cranial parasite Tylodelphys sp. (Digenea: Diplostomidae) on the behavior and physiology of puye Galaxias maculatus (Osmeriformes: Galaxiidae)
López-Rodríguez, Ruby
Ciencias Naturales
Otras Ciencias Naturales
title_short Effects of the cranial parasite Tylodelphys sp. (Digenea: Diplostomidae) on the behavior and physiology of puye Galaxias maculatus (Osmeriformes: Galaxiidae)
title_full Effects of the cranial parasite Tylodelphys sp. (Digenea: Diplostomidae) on the behavior and physiology of puye Galaxias maculatus (Osmeriformes: Galaxiidae)
title_fullStr Effects of the cranial parasite Tylodelphys sp. (Digenea: Diplostomidae) on the behavior and physiology of puye Galaxias maculatus (Osmeriformes: Galaxiidae)
title_full_unstemmed Effects of the cranial parasite Tylodelphys sp. (Digenea: Diplostomidae) on the behavior and physiology of puye Galaxias maculatus (Osmeriformes: Galaxiidae)
title_sort Effects of the cranial parasite Tylodelphys sp. (Digenea: Diplostomidae) on the behavior and physiology of puye Galaxias maculatus (Osmeriformes: Galaxiidae)
dc.creator.none.fl_str_mv López-Rodríguez, Ruby
author López-Rodríguez, Ruby
author_facet López-Rodríguez, Ruby
author_role author
dc.contributor.advisor.none.fl_str_mv George-Nascimento, Mario
Górski, Konrad
dc.contributor.institution.es_CL.fl_str_mv UNIVERSIDAD CATOLICA DE LA SANTISIMA CONCEPCION
dc.subject.oecd1n.es_CL.fl_str_mv Ciencias Naturales
topic Ciencias Naturales
Otras Ciencias Naturales
dc.subject.oecd2n.es_CL.fl_str_mv Otras Ciencias Naturales
description Diplostomatid digeneans that inhabit the eye lens of its fish second intermediate hosts are wellknown manipulators of behaviour of their hosts. They can cause cataracts that may render their host fish to be more prone to be preyed upon by bird definitive hosts. Diplostomatids such as Tylodelphys sp. that inhabit the cranial cavity, however, up to date have not been shown to alter host behaviour of fish intermediate hosts. The goal of this study was to evaluate the potential effects of Tylodelphys sp. inhabiting the cranial cavity of Galaxias maculatus on its physiology and swimming behaviour as well as its reaction to a simulated predation threat. Blind experiments in the lab were carried out on 56 specimens that were filmed individually. The Fulton index (K) was used as a factor of nutritional status and a respirometric chamber for the oxygen consumption rates (mg O2 g-1 h-1) of the fishes. Of the 56 fish, 21 were parasitized by Tylodelphys sp. (n = 625). Parasitized and non-parasitized fishes were similar in total legth, weight, sex ratio, condition factor and oxygen consumption rates. Furthermore, the magnitude of infection was not correlated with the oxygen consumption rates of G. maculatus. Parasitized fishes swam more frequently close to the surface, whereas parasite-free fish swam more frequently at intermediate depths. When faced by simulated attack of a predator, parasite-free fish showed more frequent fleeing behaviour as well as a more intense post-fleeing activity. Collectively these results suggest that Tylodelphys sp. inhabiting cranial cavity of fish may alter their behaviour predisposing them to predation by birds.
publishDate 2019
dc.date.issued.es_CL.fl_str_mv 2019
dc.date.accessioned.none.fl_str_mv 2022-03-24T12:31:01Z
2022-08-16T19:12:31Z
dc.date.available.none.fl_str_mv 2022-03-24T12:31:01Z
2022-08-16T19:12:31Z
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dc.type.tesis.none.fl_str_mv Tesis
format masterThesis
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dc.identifier.folio.es_CL.fl_str_mv 22170605
dc.identifier.uri.none.fl_str_mv https://hdl.handle.net/10533/253197
identifier_str_mv 22170605
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spelling UNIVERSIDAD CATOLICA DE LA SANTISIMA CONCEPCIONLópez-Rodríguez, Ruby2019https://hdl.handle.net/10533/253197http://purl.org/coar/access_right/c_abf2Otras Ciencias NaturalesCiencias NaturalesEffects of the cranial parasite Tylodelphys sp. (Digenea: Diplostomidae) on the behavior and physiology of puye Galaxias maculatus (Osmeriformes: Galaxiidae)George-Nascimento, MarioGórski, KonradUNIVERSIDAD CATOLICA DE LA SANTISIMA CONCEPCIONChileLópez-Rodríguez, Ruby2022-03-24T12:31:01Z2022-08-16T19:12:31Z2022-03-24T12:31:01Z2022-08-16T19:12:31Z2019Diplostomatid digeneans that inhabit the eye lens of its fish second intermediate hosts are wellknown manipulators of behaviour of their hosts. They can cause cataracts that may render their host fish to be more prone to be preyed upon by bird definitive hosts. Diplostomatids such as Tylodelphys sp. that inhabit the cranial cavity, however, up to date have not been shown to alter host behaviour of fish intermediate hosts. The goal of this study was to evaluate the potential effects of Tylodelphys sp. inhabiting the cranial cavity of Galaxias maculatus on its physiology and swimming behaviour as well as its reaction to a simulated predation threat. Blind experiments in the lab were carried out on 56 specimens that were filmed individually. The Fulton index (K) was used as a factor of nutritional status and a respirometric chamber for the oxygen consumption rates (mg O2 g-1 h-1) of the fishes. Of the 56 fish, 21 were parasitized by Tylodelphys sp. (n = 625). Parasitized and non-parasitized fishes were similar in total legth, weight, sex ratio, condition factor and oxygen consumption rates. Furthermore, the magnitude of infection was not correlated with the oxygen consumption rates of G. maculatus. Parasitized fishes swam more frequently close to the surface, whereas parasite-free fish swam more frequently at intermediate depths. 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