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From mammals back to birds: host-switch of the acanthocephalan Corynosoma australe from pinnipeds to the Magellanic penguin Spheniscus magellanicus.

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From mammals back to birds: host-switch of the acanthocephalan Corynosoma australe from pinnipeds to the Magellanic penguin Spheniscus magellanicus.

dc.contributor.author	Hernández Orts, Jesús Servando
dc.contributor.author	Brandão, Marta
dc.contributor.author	Georgieva, Simona
dc.contributor.author	Raga Esteve, Juan Antonio
dc.contributor.author	Crespo, Enrique Alberto
dc.contributor.author	Luque, José Luís
dc.contributor.author	Aznar Avendaño, Francisco Javier
dc.date.accessioned	2018-01-15T12:05:37Z
dc.date.available	2018-01-15T12:05:37Z
dc.date.issued	2017
dc.identifier.citation	Hernández Orts, Jesús Servando Brandão, Marta Georgieva, Simona Raga Esteve, Juan Antonio Crespo, Enrique Alberto Luque, José Luís Aznar Avendaño, Francisco Javier 2017 From mammals back to birds: host-switch of the acanthocephalan Corynosoma australe from pinnipeds to the Magellanic penguin Spheniscus magellanicus. Plos One 12 10 e0183809
dc.identifier.uri	http://hdl.handle.net/10550/63916
dc.description.abstract	Trophically-transmitted parasites are regularly exposed to potential new hosts through food web interactions. Successful colonization, or switching, to novel hosts, occur readily when 'donor' and 'target' hosts are phylogenetically related, whereas switching between distantly related hosts is rare and may result from stochastic factors (i.e. rare favourable mutations). This study investigates a host-switching event between a marine acanthocephalan specific to pinnipeds that is apparently able to reproduce in Magellanic penguins Spheniscus magellanicus from Brazil. Detailed analysis of morphological and morphometrical data from acanthocephalans from penguins indicates that they belong to Corynosoma australe Johnston, 1937. Partial fragments of the 28S rRNA and mitochondrial cox1 genes were amplified from isolates from penguins and two pinniped species (i.e. South American sea lion Otaria flavescens and South American fur seal Arctocephalus australis) to confirm this identification. Infection parameters clearly differ between penguins and the two pinniped species, which were significantly lower in S. magellanicus. The sex ratio of C. australe also differed between penguins and pinnipeds; in S. magellanicus was strongly biased against males, while in pinnipeds it was close to 1:1. Females of C. australe from O. flavescens were smaller than those from S. magellanicus and A. australis. However, fecundity (i.e. the proportion of fully developed eggs) was lower and more variable in females collected from S. magellanicus. At first glance, the occurrence of reproductive individuals of C. australe in Magellanic penguins could be interpreted as an adaptive colonization of a novel avian host through favourable mutations. However, it could also be considered, perhaps more likely, as an example of ecological fitting through the use of a plesimorphic (host) resource, since the ancestors of Corynosoma infected aquatic birds.
dc.language.iso	eng
dc.relation.ispartof	Plos One, 2017, vol. 12, num. 10, p. e0183809
dc.subject	Cadenes alimentàries (Ecologia)
dc.subject	Ecologia animal
dc.subject	Zoologia
dc.title	From mammals back to birds: host-switch of the acanthocephalan Corynosoma australe from pinnipeds to the Magellanic penguin Spheniscus magellanicus.
dc.type	journal article	es_ES
dc.date.updated	2018-01-15T12:05:37Z
dc.identifier.doi	10.1371/journal.pone.0183809
dc.identifier.idgrec	122554
dc.rights.accessRights	open access	es_ES