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Title: A study of the colonial organisation of two species of arborescent cellularine Bryozoa
Author: Fairall, V. R.
Awarding Body: University of Wales Swansea
Current Institution: Swansea University
Date of Award: 2004
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The central aim of the study was to describe the spatial arrangement of the zooids within a colony of Scrupocellaria reptans, in sufficient detail to reveal previously undescribed characteristics. A rudimentary population study used monthly sampling to ascertain basic biological characteristics of the species. These included settlement period, colony size changes over time and longevity. Settlement period was June to August; colonies were annual, but suffered extensive partial mortality mid-winter. The inadvertent collection of Tricellaria inopinata, a species new to Britain, by a colleague, necessitated an investigation into its confused taxonomy, via the literature and historical and recent material. The species was differentiated from two similar species. A detailed study was made of the spatial arrangement of autozooids and polymorphic heterozooids within a colony of S. reptans. The arrangement of autozooids could reveal details of colony structure, whilst that of polymorphs, not easily ‘understood’, could suggest new lines of enquiry. The methodology involved ‘mapping’ the spatial arrangement of zooids within a colony, in respect of a number of parameters, in such a way that they could be investigated singly or in any condition. A similar study was made in respect of T. inopinata. Did any new characteristics of S. reptans occur more widely? Colonies of both species had a definite structure and form. The structure, which involved a small number of long sequences of short ‘internodes’, from each of which laterally limited ‘aggregations’ of short sequences, of generally longer ‘internodes’, developed, essentially the same in both species. The form was slightly different. Polymorphs occurred constantly, predictably or unpredictably. The spatial arrangement of the latter was very complex.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available