PubMed · 864579
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D S Dundee. 1977. Mermithids in introduced molluscs.. https://pubmed.ncbi.nlm.nih.gov/864579/
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The effect of temperature on the behaviour of the infective larvae of Trichostrongylus colubriformis has been investigated. Larvae acclimatized at 3 degrees C or 20 degrees C respond to sudden or gradual increases in temperature by coiling. Increased temperature may indicate a risk of exposure to desiccation and elicits a behavioural response which optimizes survival. Larvae are straight when inactive; coiling is an active response to specific stimuli. Larval activity is initiated by exogenous stimuli. Mechanical disturbance is a major stimulus, the response being affected by changes in temperature. Larvae acclimatized at 3 degrees C or 20 degrees C show a peak of activity at temperatures between 15 and 25 degrees C.
The concentration of urea in the excreta of the 6th instar larvae of Spodoptera mauritia varies from 4.017 +/- 0.541 to 31.052 +/- 1.193 mumoles/g dry excreta (mean +/- SE). The observation confirms that urea excreted is of metabolic origin.
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