期刊
JOURNAL OF PARASITOLOGY
卷 99, 期 1, 页码 137-144出版社
AMER SOC PARASITOLOGISTS
DOI: 10.1645/GE-3163.1
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资金
- earmarked fund for China Agriculture Research System [CARS-46-08]
- State Key Laboratory of Freshwater Ecology and Biotechnology [2011FB07]
- National Natural Science Foundation of China [31172409]
The nematodes Eustrongylides spp. collected from different fish species in China were examined for their intra-and interspecific evolutionary variations using the molecular markers mitochondrial cytochrome oxidase c subunit 1 (COI) gene and internal transcribed spacer (ITS) rDNA regions. The phylogenetic analysis indicated that Eustrongylides species are divided into 3 well-supported clades. The ITS divergence between the clades suggested that clades 2 and 3 might represent the same species, whereas clade 1 represent another cryptic species. The host specificity of these nematodes was analyzed according to prevalence data, host range, and phylogenetic information. Clade 1 was found in 4 fish species, i.e., Odontobutis obscurus, Silurus asotus, Culter mongolicus, and Acanthogobius flavimanus, but was predominant in the 2 perciform species, O. obscurus and A. flavimanus. Clade 2 was found in 3 fish species, Monopterus albus, Channa argus, and Channa asiatica, but was predominant in M. albus, reported to feed primarily on oligochaetes, the first intermediate host of Eustrongylides sp. Clade 3 was found in 9 species, but its low prevalence suggests accidental infection in all species. Although the larval nematode presented low host specificity, it exhibited some host preference.
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