Observations on the occurrence and collection of ...

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Title Observations on the occurrence and collection of mermithid nematodes from blackflies (Diptera: Simuliidae)
Author(s) C. H. Bailey, R. Gordon
Journal Canadian Journal of Zoology
Date 1977
Volume 55
Issue 1
Start page 148
End page 154
Abstract In 1973-75, larval blackflies were sampled for mermithid nematodes in 83 streams in Newfoundland, Canada. Prosimulium mixtum/fuscum and Simulium venustum were the predominant hosts of Neomesomermis flumenalis but rates of infection in late-instar larvae were generally low (4.3 plus or minus 0.7% and 5.4 plus or minus 1.2% for P. mixtum/fuscum and S. venustum, respectively). Mermithid infection in the streams studied showed temporal fluctuations and varied among and within host breeding sites. When numbers of parasitized larvae were judged adequate, mass collections of larvae were made and held in the laboratory for emergence of mermithids. Nematode emergence was in 2 distinct peaks, one for the Prosimulium generation and the other for the first generation of S. venustum. The temporal separation of the peaks varied from year to year owing to weather. Observations on the bionomics of both mermithids and blackfly hosts made during the course of the surveys and technical problems inherent to such studies are discussed. [AS]ADDITIONAL ABSTRACT:In 1973-75, simuliid larvae were sampled for mermithid parasites in 83 streams in Newfoundland. The predominant hosts of Neomesomermis flumenalis were Simulium venustum Say and the complex of Prosimulium mixtum Syme & Davies and P. fuscum Syme & Davies, in which the rates of infection averaged 5.4 and 4.3%, respectively. Mermithid infection in the streams showed temporal fluctuations and varied among and within host breeding sites. When the numbers of parasitised larvae were judged adequate, mass collections of larvae were made and held in the laboratory for the emergence of mermithids. Emergence of mermithids was in 2 distinct peaks, one for the Prosimulium generation and the other for the first generation of S. venustum. The temporal separation of the peaks varied from year to year according to the weather. The bionomics of the mermithids and the simuliids are discussed, together with the technical problems inherent in investigations on them..

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