Some effects of mermithid parasitism on the larval ...
|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|
|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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