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Title: The ecology of psammobiotic ciliates
Author: Wright, M. J.
Awarding Body: University College of Swansea
Current Institution: Swansea University
Date of Award: 1982
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The psammobiotic ciliates, meiofauna, diatoms and flagellates occurring in the intertidal of two South Wales sandy shores (Swansea Bay and Nicholaston) were studied for a twelve month period. A detailed study of the ciliates occurring at both stations is presented as a species list and as an analysis of the seasonal variation in populations. The species list is accompanied by descriptions where relevant and, in the case of species new to science, a fuller description has been included. A number of the more commonly occurring ciliates are also illustrated. A comparison between the two stations reveals a marked difference in the species present and their population cycles. Swansea, the site more sheltered from wave action, is characterised by large numbers (379, 380 10cm 2 to a depth of 14cm), pronounced seasonal changes in population and typically long, thin, thigmotactic species. Nicholaston, a wave exposed shore, has relatively fewer numbers (229,800 10 cm-2 to a depth of 14cm), the population does not show any noticeable seasonal effect, the typical species are generally more robust and occasionally are present in huge numbers (2,398,750 l0cm 2 to a depth of 14cm). Using the data from Swansea, a further analysis was made of the environmental factors and ciliate numbers for each individual month using Pearson correlations and partial correlation techniques. Unfortunately, a large amount of data had to be excluded from the analysis because many samples contained no examples of particular species producing very skewed data. However a number of interrelationships were noted, of especial interest when depth was the controlled variable in the partial correlation analysis. From the Pearson correlation analysis it was apparent that the relationship between depth and mean grain size is markedly affected by seasonal factors. From the partial correlation analysis emerged an inconsistant relationship between mean grain size and ciliate numbers.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available