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The European eel may tolerate multiple infections at a low biological cost

Published online by Cambridge University Press:  25 February 2015

ELVIRA MAYO-HERNÁNDEZ ,
EMMANUEL SERRANO ,
JOSE PEÑALVER ,
ALFONSA GARCÍA-AYALA ,
ROCÍO RUIZ DE YBÁÑEZ  and
PILAR MUÑOZ
ELVIRA MAYO-HERNÁNDEZ*
Affiliation:
Departamento de Sanidad Animal, Universidad de Murcia, 30100 Murcia, España Campus de Excelencia Internacional Regional ‘Campus Mare Nostrum’, Universidad de Murcia, Espinardo, 30100 Murcia, España
EMMANUEL SERRANO
Affiliation:
CESAM, Departamento de Biologia, Universidade de Aveiro, Campus Universitario de Santiago, 3810-193 Aveiro, Portugal Servei d'Ecopatologia de Fauna Salvatge, Departament de Medicina i Cirurgia Animal, Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona, España
JOSE PEÑALVER
Affiliation:
Campus de Excelencia Internacional Regional ‘Campus Mare Nostrum’, Universidad de Murcia, Espinardo, 30100 Murcia, España Servicio de Pesca y Acuicultura, D.G. de Ganadería y Pesca, Consejería de Agricultura y Agua de la Región de Murcia, JUAN XXIII, 30071 Murcia, España
ALFONSA GARCÍA-AYALA
Affiliation:
Campus de Excelencia Internacional Regional ‘Campus Mare Nostrum’, Universidad de Murcia, Espinardo, 30100 Murcia, España Departamento de Biología Celular e Histología, Universidad de Murcia, 30100 Murcia, Spain
ROCÍO RUIZ DE YBÁÑEZ
Affiliation:
Departamento de Sanidad Animal, Universidad de Murcia, 30100 Murcia, España Campus de Excelencia Internacional Regional ‘Campus Mare Nostrum’, Universidad de Murcia, Espinardo, 30100 Murcia, España
PILAR MUÑOZ
Affiliation:
Departamento de Sanidad Animal, Universidad de Murcia, 30100 Murcia, España Campus de Excelencia Internacional Regional ‘Campus Mare Nostrum’, Universidad de Murcia, Espinardo, 30100 Murcia, España
*
*Corresponding author: Departamento de Sanidad Animal, Universidad de Murcia, Espinardo. CP: 30100 Murcia, Spain E-mail: elviramayohdz@gmail.com
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Summary

Most animals are concurrently infected with multiple parasites, and interactions among them may influence both disease dynamics and host fitness. However, the sublethal costs of parasite infections are difficult to measure and the effects of concomitant infections with multiple parasite species on individual physiology and fitness are poorly described for wild hosts. To understand the costs of co-infection, we investigated the relationships among 189 European eel (Anguilla anguilla) from Mar Menor, parasites (richness and intensity) and eel's ‘health status’ (fluctuant asymmetry, splenic somatic index and the scaled mass index) by partial least squares regression. We found a positive relationship with 44% of the health status variance explained by parasites. Contracaecum sp. (Nematoda: Anisakidae) was the strongest predictor variable (44·72%) followed by Bucephalus anguillae (Platyhelminthes: Bucephalidae), (29·26%), considered the two most relevant parasites in the analysis. Subsequently, 15·67 and 12·01% of the response variables block were explained by parasite richness and Deropristis inflata (Platyhelminthes: Deropristiidae), respectively. Thus, the presence of multiple parasitic exposures with little effect on condition, strongly suggests that eels from Mar Menor tolerate multiparasitism.

Keywords

co-infectionmultiparasitismfluctuant asymmetrybody scaled masssplenic somatic indexeelteleost
Type
Research Article
Information
Parasitology , Volume 142 , Issue 7 , June 2015 , pp. 968 - 977
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Copyright
Copyright © Cambridge University Press 2015 

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