University of Khartoum

On the Behaviour and Sensory Physiology of Alphitobius diaperinus (Coleoptera: tenerbrionidae ).

On the Behaviour and Sensory Physiology of Alphitobius diaperinus (Coleoptera: tenerbrionidae ).

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Title: On the Behaviour and Sensory Physiology of Alphitobius diaperinus (Coleoptera: tenerbrionidae ).
Author: Fathi Mohamed Ahmed, El Rabaa
Abstract: This thesis is concerned with the behaviour and orientation of A. diaperinus in response to environmental factors. The humidity behaviour of A diaperinus has been studied using a modification of the alternative chamber described by Gunn and Kennedy (1936), Wigglesworth (1941) and cloudsley-Thompson (1951). The humidity reaction was found to be correlated with the structure and distribution of the basiconic sensillae on the antennae. The light reactions were studied using a modification of the alternative chamber. Adult beetles display an intense photonegative reaction when tested at different uniform intensities of illumination and at different uniform humidities, intensity of reaction was slightly decreased by high humidity. Diurnal rhythms were studied using a simple but sensitive aktograph. It was found that A. diaperinus is a nocturnal insect with an endogenous rhythm of movement and rest, synchronized primarily by alternating light and darkness. Temperature reactions were studied using the choice chamber apparatus described by wiggles worth (1941) and Cloudsley-Thompson (1951). The preferred temperature was found to be 33 °C lying in the middle of the range 29- 37°C. The mechanisms of the temperature reactions are ortho-kinesis and klino-kinesis. Light reaction was found to override reactions to temperature and humidity. A. diaperinus Possesses an olfactory sense sensitive to ammonia and ethyl alcohol. The beetles were attracted by pigeon, bat and chicken scents and their own faeces, but wore repelled by human faeces. They were attracted by odours of potatoes, bread mould Rhizopus nigricans and extracts of their own abdomen. The mechanism of olfactory reactions on klino-kinesis and klinoi–taxis are correlated with the distribution of the basiconic sensillae of the antennae. A. diaperinus possesses a contact chemical sense sensitive to sodium chloride, glucose, the membranous parts of the apical papal segments, together with the simple basiconic sensillae on them were found to be the contact chemo receptors. The beetles were found to be omnivorous, preferring mouldy bread and orange. Reactions to contact A. diaperinus prefers rough surfaces apart from positive thigmo-taxis and low thigmo-kinetis, ortho-kinesic and klino- kinetic mechanisms are involved in the orientation of A. diaperinus to contact stimulation.
Description: 225page
URI: http://khartoumspace.uofk.edu/handle/123456789/15689
Date: 2015-06-30


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