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Population structure of anisakis simplex (nematoda) in harbor porpoises phocoena phocoena off Denmark

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Population structure of anisakis simplex (nematoda) in harbor porpoises phocoena phocoena off Denmark

dc.contributor.author	Herreras Belled, Maria Victoria
dc.contributor.author	Balbuena, Juan Antonio
dc.contributor.author	Aznar Avendaño, Francisco Javier
dc.contributor.author	Kaarstad, S. E.
dc.contributor.author	Fernández, M.
dc.contributor.author	Raga Esteve, Juan Antonio
dc.date.accessioned	2010-08-09T10:34:09Z
dc.date.available	2010-08-09T10:34:09Z
dc.date.issued	2004
dc.identifier.citation	HERRERAS BELLED, Maria Victoria ; Balbuena Diaz-Pines, Juan Antonio ; Aznar Avendaño, Francisco Javier ; Kaarstad, S. E. ; Fernández, M. ; Raga Esteve, Juan Antonio, 2004, Population structure of anisakis simplex (nematoda) in harbor porpoises phocoena phocoena off Denmark, Journal of Parasitology, vol. 90, no. 5, p. 933–938	en
dc.identifier.uri	http://hdl.handle.net/10550/16774
dc.description.abstract	The population structure and habitat selection of Anisakis simplex in 35 harbor porpoises off Denmark are described. The nematodes were collected from the stomach and duodenal ampulla and were categorized as third-stage larvae, fourth-stage larvae, subadults, and adults. The porpoises harbored 8,043 specimens of A. simplex. The proportion of adults and subadults increased with infrapopulation size. The number of development stages across infrapopulations covaried significantly (Kendall's test of concordance). Concordance was higher in hosts with the highest intensities than in those with low and medium intensities. All stages occurred mainly in the forestomach, but this trend was stronger for the adults. Adult and subadult sex ratios did not depart significantly from 1:1. Our data suggested that recruitment and duration of each stage were the main factors accounting for infrapopulation structure. The preference of A. simplex for the forestomach conformed with previous studies, but the narrower distribution of adults relative to other stages might indicate a strategy to enhance mating opportunities. Information on sex ratios of A. simplex is scarce and contradictory. We suggest that the discrepancies might partly reflect differences in categorization criteria and statistical methods.	en
dc.language.iso	en	en
dc.subject	Anisakis Simplex ; Phocoena ; Denmark	en
dc.title	Population structure of anisakis simplex (nematoda) in harbor porpoises phocoena phocoena off Denmark	en
dc.type	journal article	es_ES
dc.subject.unesco	UNESCO::CIENCIAS DE LA VIDA	en
dc.subject.unesco	UNESCO::CIENCIAS DE LA VIDA::Biología animal (Zoología) ::Parasitología animal	en
dc.identifier.idgrec	004976	en
dc.type.hasVersion	VoR	es_ES
dc.identifier.url	http://www.journalofparasitology.org/doi/pdf/10.1645/GE-188R	en