Molecular phylogenetics and biogeography of Bunodera spp. (Trematoda: Allocreadiidae), parasites of percid and gasterosteid fishes

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Abstract:

The genus Bunodera Railliet, 1896 is represented by five freshwater species: the holarctic B. luciopercae (Müller, 1776) in percids; the endemic North American B. sacculata VanCleave and Mueller, 1932 in percids; B. eucaliae (Miller, 1936) and B. inconstans (Lasee, Font and Sutherland, 1988) in freshwater sticklebacks; and the trans-Pacific B. mediovitellata Tsimbaliuk and Roytman, 1966 in the threespine stickleback (Gasterosteus aculeatus L., 1758). Partial sequences of the 28S ribosomal RNA gene were combined with morphological data for a phylogenetic analysis of Bunodera spp. Parsimony analysis of the combined data yielded a tree (consistency index = 0.84) that supports the following resolution: ((((B. luciopercae(((B. sacculata((B. mediovitellata(B. eucaliae + B. inconstans)))). The basal position of B. luciopercae is consistent with its holarctic distribution and a basal percid as its main host. The relatively basal positions of two typical perch parasites and the association of a more derived clade (B. mediovitellata + B. eucaliae + B. inconstans) with sticklebacks indicate host shifting from percids to sticklebacks. The sister relationships and North American endemicity of the two most derived species, B. eucaliae and B. inconstans, are also consistent with the more derived position of their typical host, the freshwater brook stickleback (Culaea inconstans (Kirtland, 1841)).

Le genre Bunodera Railliet, 1896 contient cinq espèces d'eau douce : l'espèce holarctique B. luciopercae (Müller, 1776) chez les percidés; l'endémique nord-américain B. sacculata VanCleave et Mueller, 1932 chez les percidés; B. eucaliae (Miller, 1936) et B. inconstans (Lasee, Font et Sutherland, 1988) chez les épinoches d'eau douce ainsi que l'espèce transpacifique B. mediovitellata Tsimbaliuk et Roytman, 1966, chez l'épinoche à trois épines (Gasterosteus aculeatus L., 1758). Notre analyse phylogénétique des espèces de Bunodera se base sur l'étude de séquences partielles du gène d'ARN ribosomique 28S et de données morphologiques. Une analyse de parcimonie des données conjointes génère l'arbre suivant (indice de cohérence = 0,84) dont la résolution est ((((B. luciopercae(((B. sacculata((B. mediovitellata(B. eucaliae + B. inconstans)))). La position de B. luciopercae à la base de l'arbre concorde avec sa répartition holarctique et son hôte principal, un percidé primitif. La position relativement basale de deux parasites typiques des perchaudes et l'association d'un clade plus dérivé (B. mediovitellata + B. eucaliae + B. inconstans) avec les épinoches indiquent une changement d'hôtes, des percidés aux épinoches. La relation d'espèces-soeurs entre les deux espèces les plus dérivées, B. eucaliae et B. inconstans, et leur endémicité nord-américaine concordent avec la position plus dérivée de leur hôte typique, l'épinoche à cinq épines (Culaea inconstans (Kirtland, 1841)).[Traduit par la Rédaction]

Document Type: Research Article

Publication date: December 1, 2005

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