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The humidity reactions of the large pine weevil hylobius abietis coleoptera curculionidae during 3 stages of its life cycle



The humidity reactions of the large pine weevil hylobius abietis coleoptera curculionidae during 3 stages of its life cycle



Annales Entomologici Fennici 45(2): 59-64



The humidity reactions of 3 physiological stages of H. abietis Linnaeus were investigated in the choice chamber. Newly emerged and swarmed weevils were moderately hygronegative, the response being weakest in swarmed males. Older, reproductive weevils were strongly hygronegative; when the moister humidity alternative was 100% RH [relative humidity]. The intensity of their reaction increased with the log of the humidity difference between the 2 compartments, conforming to the Weber-Fechner Law. In reproductive weevils the humidity responses elicited by small humidity gradients depended on the situation of the gradient on the humidity scale. Females were hygropositive in dry conditions, but preferred the drier side when choosing between 2 moist alternatives. In males the intensity of the reaction decreased to indifference toward the drier end of the humidity scale. Observations of single females revealed that both orthokinesis and boundary turning cooperate in producing the hygronegative response. The significance of humidity reactions during the life cycle is discussed.

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