Gastrointestinal helminths of Commerson¹s dolphins Cephalorhynchus commersonii from central Patagonia and Tierra del Fuego

Diseases of Aquatic Organisms

Susana Noemí Pedraza¹  Bárbara Berón-Vera¹  R. Natalie P. Goodall¹  Mariano Koen Alonso¹  Enrique Alberto Crespo¹  Alicia Gil de Pertierra¹  Juan Antonio Raga¹ 

关键词: Commerson¹s dolphin;    Cephalorhynchus commersonii;    Gastrointestinal parasites;    Hadwenius sp.;    Pholeter gastrophilus;    Strobilocephalus triangularis;    Central Patagonia;    Tierra del Fuego;   

DOI  :  10.3354/dao047201

学科分类：生物科学（综合）

来源: Inter-Research

【 摘 要 】

ABSTRACT: The stomachs and intestines of 9 Commerson¹s dolphins incidentally caught in trawl nets in central Patagonia and 23 stranded on beaches in Tierra del Fuego were surveyed for helminth parasites. A total of 267 individuals belonging to 4 speciesof parasites (1 nematode, 3 digeneans) were found in the dolphins from the first area: Anisakis sp. (larvae type 1 = A. simplex), Braunina cordiformis, Hadwenius sp. and Pholeter gastrophilus. In the Tierra del Fuegodolphins, 142 specimens belonging to 3 species (2 nematodes, 1 digenean, 1 cestode) were found: A. simplex, Hadwenius sp. and Strobilocephalus triangularis. Only 2 of the helminth species were shared in the 2 study areas, A.simplex and Hadwenius sp., and both were more common in central Patagonia. Among the species, A. simplex was most prevalent and abundant in both study areas. In Tierra del Fuego, adults of A. simplex appeared in only 1 host.Hadwenius sp., P. gastrophilus and S. triangularis are new host records for Commerson¹s dolphin. Species diversity and species richness were low in both study areas. Helminth communities were more diverse in central Patagonia(t = 1.97, df = 258, p < 0.05) and species richness was higher in central Patagonia (S = 4). No differences in diversity were observed between females and males of central Patagonia (t = 1.97, df = 139, p < 0.05) and between females ofcentral Patagonia and Tierra del Fuego. The results may suggest some differences in habitat use, diet and sex between Commerson¹s dolphin populations in the 2 study areas.

【 授权许可】

Unknown