Article
Genetic diversity and population structure of Synthesium pontoporiae (Digenea, Brachycladiidae) linked to its definitive host stocks, the endangered Franciscana dolphin, Pontoporia blainvillei (Pontoporiidae) off the coast of Brazil and Argentina
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MARIGO, J. et al. Genetic diversity and population structure of Synthesium pontoporiae (Digenea, Brachycladiidae) linked to its definitive host stocks, the endangered Franciscana dolphin, Pontoporia blainvillei (Pontoporiidae) off the coast of Brazil and Argentina. Journal of Helmintholog, v.89, n.1, p.19–27, Jan. 2015.
0022-149X
10.1017/S0022149X13000540
1475-2697
Autor
Marigo, J.
Cunha, H. A.
Bertozzi, C. P.
Souza, S. P.
Rosas, F. C. W.
Cremer, M. J.
Barreto, A. S.
Oliveira, L. R. de
Cappozzo, H. L.
Valente, A. L. S.
Santos, C. P.
Vicente, A. C. P.
Resumen
Pontoporia blainvillei (Gervais and d’Orbigny, 1844) is an endangered small
cetacean endemic to South America with four Franciscana Management Areas
(FMA) recognized as different population stocks. The role of the intestinal
parasite Synthesium pontoporiae (Digenea: Brachycladiidae) as a possible
biological marker to differentiate P. blainvillei stocks was evaluated using nuclear and mitochondrial DNA markers. Internal transcribed sequence 1 and 2
(ITS1 and ITS2) regions of S. pontoporiae did not show intraspecific variability.
The mitochondrial NADH dehydrogenase subunit 3 (ND3) and cytochrome
oxidase subunit I (COI) gene sequences suggested lack of population structure in
S. pontoporiae and population expansion. The apparent panmixia of S. pontoporiae
may be due to the high mobility of one or more of its intermediary hosts.
Alternatively, it may be due to the small sample size. This result is incongruent
with the previously proposed FMA.