Genetic divergence and reproductive isolation between Anisakis brevispiculata and Anisakis physeteris (Nematoda: Anisakidae)s

In order to assess the taxonomic status of Anisakis brevispiculata Dollfus, 1966 population samples of this taxon from central and southeastern Atlantic ocean were compared at 22 enzymatic loci with samples belonging to Anisakis physeteris Baylis, 1923 from the Mediterranean sea and central-eastern...

Full description

Bibliographic Details
Published in:International Journal for Parasitology
Main Authors: MATTIUCCI, Simonetta, PAGGI, Lia, NASCETTI, Giuseppe, CIANCHI, Maria Rossella, BULLINI, Luciano, E. Abollo, S. c. Webb, S. Pascual
Other Authors: Mattiucci, Simonetta, Paggi, Lia, Nascetti, Giuseppe, E., Abollo, S. c., Webb, S., Pascual, Cianchi, Maria Rossella, Bullini, Luciano
Format: Article in Journal/Newspaper
Language:English
Published: PERGAMON-ELSEVIER SCIENCE LTD 2001
Subjects:
host preference
molecular systematic
allozyme marker
genetic divergence
anisakis brevispiculata
type ii larvae
anisakid nematode
allozyme electrophoresi
reproductive isolation
Catodon
Sperm whale
Online Access:http://hdl.handle.net/11573/251528
https://doi.org/10.1016/s0020-7519(00)00125-9
http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=000167089600002&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=0c7ff228ccbaaa74236f48834a34396a
http://www.scopus.com/inward/record.url?eid=2-s2.0-0035146896&partnerID=65&md5=c3c2744eeb901c6715c6ffa3bd4c4f7c
Description
Summary:In order to assess the taxonomic status of Anisakis brevispiculata Dollfus, 1966 population samples of this taxon from central and southeastern Atlantic ocean were compared at 22 enzymatic loci with samples belonging to Anisakis physeteris Baylis, 1923 from the Mediterranean sea and central-eastern Atlantic ocean. Very low interpopulational genetic divergence was observed both within A. brevispiculata (average D-Nei = 0.008) and within A. physeteris (D-Nei = 0.009) despite the geographic distance among the samples, indicating high levels of gene flow in both taxa. On the other hand, the average genetic distance between A. brevispiculata and A. physeter-is was found to be D-Nei = 0.80, a value generally observed between well differentiated congeneric species. The reproductive isolation between A. brevispiculata and A. physeteris is indicated by the following observations: (1) no Fl hybrids or recombinant genotypes were until now observed; and (2) the two Anisakis species do not seem to share their definitive hosts. The main definitive host of A. brevispiculata is the pygmy sperm whale (Kogia breviceps), while for A. physeteris it is the sperm whale (Physeter catodon). Only adult males differ slightly in spicule length, while females and larval stages are not differentiated morphologically. Both A. brevispiculata and A. physeteris show a type II larva. The correct recognition of A. brevispiculata from A. physeteris and from other Anisakis species studied, in either sexes and at any life stage, is made easy by allozyme markers (e.g. Icdh, Gapdh, Sod-l, Np, Aat-2, Adk-2, fEst-2, PepB, PepC-2, Mpi). Diagnostic keys, which can be used for routine identification in the field of these Anisakis worms, based on genetic markers, are given.

Similar Items