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- Title
MOLECULARPHYLOGENY AND HOST SPECIFICITY OF THE LARVAL EUSTRONGYLIDES (NEMATODA:DIOCTOPHMIDAE) FROM FRESHWATER FISH IN CHINA.
- Authors
Fan Xiong; Li, Wen X.; Wu, Shan G.; Hong Zou; Wang, Gui T.
- Abstract
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 (CO1) gene and internal transcribed spacer (ITS) rDNA regions. The phylogenetic analysis indicated that Eustrongylides species are divided into 3 wells-upported 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.
- Publication
Journal of Parasitology, 2013, Vol 99, Issue 1, p137
- ISSN
0022-3395
- Publication type
Academic Journal
- DOI
10.1645/GE-3163.1