Identificación de parásitos nemátodos del lobo fino antártico (Arctocephalus gazella) (Peters, 1875) en Cabo Shirreff, Isla Livingston, Antártica
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Date
2007
Journal Title
Journal ISSN
Volume Title
Publisher
Universidad Austral de Chile
Abstract
El presente estudio entrega un primer acercamiento al conocimiento sobre los
nemátodos presentes en el lobo fino antártico (Arctocephalus gazella) ya que hasta este momento no se registraba literatura respecto de este tema.
Dado que la dieta de las hembras de A. gazella esta compuesta en parte por peces que albergan nemátodos Anisákidos, se postula que éstos están presentes en este
Pinnipedio, por lo que los objetivos de esta tesis fueron identificar las posibles especies de parásitos nemátodos Anisákidos presentes en A. gazella y determinar, a través de un análisis morfológico, si las especies encontradas corresponden o no a especies nuevas para la ciencia.
Se analizaron muestras fecales durante cuatro temporadas de campo en las que
encontraron un total de 47 parásitos, los que estaban en estados larvales y que
correspondían a dos géneros de nemátodos de la familia Anisakidae, Pseudoterranova sp y Anisakis sp.
La presencia de estos nemátodos en estados larvales no implica que A. gazella sea el hospedador definitivo, por lo que se requieren nuevos estudios para tener mayor
información de su fauna parasitaria.
The present study provides a first approach to gaining knowledge of nematodes present in the Antarctic fur seal (Arctocephalus gazella) since no literature on this subject is available to date. Considering that the diet of A. gazella females is partly comprised by fish that host Anisakid nematodes, we expected them to be present in this Pinniped, and thus the objectives of this thesis were to identify the species of Anisakid parasitic nematodes present in A. gazella and to determine, through morphologic analyses, if the species found correspond to new species for science. Samples obtained during four field seasons were analyzed and a total of 47 parasites were found, corresponding to larval stages of two genuses of nematodes from the Anisakidae family, Pseudoterranova sp. and Anisakis sp. The presence of these nematodes in larval stages does not imply that A. gazella is its definitive host, and possibly more studies are required to gather more information of the parasitic fauna of A. gazella.
The present study provides a first approach to gaining knowledge of nematodes present in the Antarctic fur seal (Arctocephalus gazella) since no literature on this subject is available to date. Considering that the diet of A. gazella females is partly comprised by fish that host Anisakid nematodes, we expected them to be present in this Pinniped, and thus the objectives of this thesis were to identify the species of Anisakid parasitic nematodes present in A. gazella and to determine, through morphologic analyses, if the species found correspond to new species for science. Samples obtained during four field seasons were analyzed and a total of 47 parasites were found, corresponding to larval stages of two genuses of nematodes from the Anisakidae family, Pseudoterranova sp. and Anisakis sp. The presence of these nematodes in larval stages does not imply that A. gazella is its definitive host, and possibly more studies are required to gather more information of the parasitic fauna of A. gazella.
Description
Tesis para optar al grado de Licenciado en Ciencias Biológicas
Keywords
Ciencia, Lobo Fino Antártico, Arctocephalus gazella, Parásitos gastrointestinales, Nematoda