Some effects of mermithid parasitism on the larval ...

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Title Some effects of mermithid parasitism on the larval blackflies Prosimulium mixtum fuscum and Simulium venustum
Author(s) W. J. Condon, R. Gordon
Journal Journal of Invertebrate Pathology
Date 1977
Volume 29
Issue 1
Start page 56
End page 62
Abstract Histochemical studies in the laboratory in Canada on field-collected larvae of Prosimulium fuscum Syme & Davies (mixtum fuscum) revealed no significant differences in the endocrine activity of larvae infected with mermithid nematodes and healthy larvae (of similar body dimensions). In the case of field-collected larvae of Simulium venustum Say, mermithid parasitism significantly increased the nuclear DNA/RNA activity of the corpus allatum as well as the volume and amount of stored neurosecretory material in the corpus cardiacum. A marked decline in glycogen concentration and amount of fat-body was evident in infected larvae of both simuliid species. Fat-body nucleic-acid activity was unaffected by mermithid parasitism. The significance of the effects of mermithid parasitism is discussed with regard to the host-parasite relationship.ADDITIONAL ABSTRACT:Histochemical studies on field collected larval blackflies showed no significant differences in endocrine activity between Neomesomermis flumenalis-infected and uninfected Prosimulium mixtum fuscum larvae of similar body dimensions. In Simulium venustum, N. flumenalis significantly increased the nuclear DNA/RNA activity of the corpus allatum as well as the volume and amount of stored neurosecretory material in the corpus cardiacum. A marked decline in glycogen concentration and the amount of fat body tissue was evident in both infected simuliids. Fat body nucleic acid activity was unaffected by infection..

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