Use this URL to cite or link to this record in EThOS: https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.380010
Title: Spider tracheation : its behavioural and physiological consequences
Author: Bromhall, Clive
ISNI:       0000 0001 3481 2814
Awarding Body: University of Oxford
Current Institution: University of Oxford
Date of Award: 1987
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Abstract:
The problem of why spiders possess two types of respiratory structure, book-lungs and tracheae, was investigated. The tracheal systems of a number of species of spider were visualized using a vacuum-injection method. A new technique for dissolving the soft-tissues of spiders, whilst leaving the tracheae unharmed, is described. Photographs and line-drawings illustrate a variety of tracheal structures. The concentration of haemocyanin [Hc] in the blood of 26 species of spider was investigated. There was significant variation between the [Hc] of different species. Species with a highly-developed tracheal system typically had low [Hc]; however, some species with tracheae limited to the abdomen also had low [Hc]. No relationship was found between [Hc] and predation strategy. A non-invasive laser/fibre-optic technique was developed to measure the heart-rates of active unrestrained spiders. The heart-rates of 15 species of spider were measured before, during, and after activity. In contrast to the opinion of some workers, heart-pumping was maintained during locomotion. Heart-rates decreased at the onset of forced fast running and a rise occurred when running ceased. Spiders with prosomal tracheae had lower heart-rates than spiders with tracheae limited to the abdomen. Dysdera had an atypical heart-beat. A possible association between maximum heart-rate and predation strategy is proposed. The efficiency of tracheae in transporting gases around the body was investigated by measuring the metabolic rates of spiders with and without prosomal tracheae. Spiders with prosomal tracheae had lower resting metabolic rates, but similar maximum metabolic rates, compared with spiders with tracheae limited to the abdomen. The species with prosomal tracheae typically had faster recovery rates, after exercise, than species without prosomal tracheae. The role of tracheae in spiders is discussed.
Supervisor: Phillipson, John Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.380010  DOI: Not available
Keywords: Spiders ; Physiology ; Tracheae in arthropoda ; Behaviour
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