Behavioural responses of caddisfly larvae (Hydropsyche angustipennis) to hypoxia
Contributions to Zoology , Volume 76 - Issue 4 p. 255- 260
The availability of aquatic oxygen can limit habitat suitability for benthic insects, and differences in hypoxia tolerance can therefore play a role in explaining distributions in the field. This study describes a behavioural test in which the trade off between different survival strategies after exposure to different oxygen concentrations is analyzed, using the caddisfly Hydropsyche angustipennis as a model organism. The impedance conversion technique was used to quantify patterns of behaviour for individual caddisflies at three levels of dissolved oxygen (100%, 50%, and 30% saturation) under controlled laboratory conditions. Exposure to hypoxia resulted in behavioural changes: under low-oxygen conditions, larvae increased their ventilation rate, which may increase oxygen uptake. However, they also increased the time spent on other activities, which may reflect avoidance behaviour.
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|Contributions to Zoology|
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van der Geest, H.G. (2007). Behavioural responses of caddisfly larvae (Hydropsyche angustipennis) to hypoxia. Contributions to Zoology, 76(4), 255–260.