Parasitology Research

, Volume 108, Issue 4, pp 781–792 | Cite as

Molecular characterization and phylogeny of anisakid nematodes from cetaceans from southeastern Atlantic coasts of USA, Gulf of Mexico, and Caribbean Sea

  • Serena Cavallero
  • Steven A. Nadler
  • Lia Paggi
  • Nelio B. Barros
  • Stefano D’Amelio
Original Paper

Abstract

In the present study, 407 anisakid nematodes, collected from 11 different species of cetaceans of the families Delphinidae, Kogiidae, Physeteridae, and Ziphiidae, from the southeastern Atlantic coasts of USA, the Gulf of Mexico, and the Caribbean Sea, were examined morphologically and genetically characterized by PCR restriction fragment length polymorphism to identify them to species level, assess their relative frequencies in definitive hosts, and determine any host preference. Sequence data from nuclear ribosomal internal transcribed spacer and mitochondrial cox2 genes were analysed by maximum parsimony and Bayesian inference methods, as separate and combined datasets, to evaluate phylogenetic relationships among taxa. The results revealed a highly diverse ascaridoid community. Seven Anisakis species and Pseudoterranova species were recovered as adult parasites. Larval forms of Contracaecum multipapillatum were also found in a coastal population of bottlenose dolphins. The phylogenetic trees obtained from the combined dataset (and most individual datasets) revealed the existence of distinct clades, the first including species of the Anisakis simplex complex (A. simplex s.s., Anisakis pegreffii, A. simplex C), (Anisakis nascettii, Anisakis ziphidarum) and the second including Pseudoterranova ceticola ((Anisakis paggiae, (Anisakis physeteris, Anisakis brevispiculata)). This finding, excluding the relationship of P. ceticola, is consistent with the morphology of adult and larval specimens. Considering the presence versus absence of an intestinal cecum, the relationship of P. ceticola with the members of the second clade of Anisakis appears inconsistent with morphological evidences but consistent with host preference. The position of Anisakis typica as the sister group to the two main anisakid clades indicates that it represents a third distinct lineage.

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Copyright information

© Springer-Verlag 2011

Authors and Affiliations

  • Serena Cavallero
    • 1
  • Steven A. Nadler
    • 2
  • Lia Paggi
    • 1
  • Nelio B. Barros
    • 3
  • Stefano D’Amelio
    • 1
  1. 1.Department of Public Health and Infectious Diseases, Section of ParasitologySapienza University of RomeRomeItaly
  2. 2.Department of NematologyUniversity of CaliforniaDavisUSA
  3. 3.Biology DepartmentPortland State UniversityPortlandUSA

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