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Title: Late-Glacial coleopteran assemblages from the west coast of the Isle of Man
Author: Joachim, M. J.
ISNI:       0000 0001 3590 7727
Awarding Body: University of Birmingham
Current Institution: University of Birmingham
Date of Award: 1978
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The Quaternary sediments of the west coast of the Isle of Man include kettlehole deposits of organic material, some of which have been shown by radio-carbon dating to be Late glacial. The general Quaternary stratigraphy of the west coast near Kirkmichael and Jurby is briefly surveyed, and detailed descriptions are given of six organic sites in these areas. Material from one site at Jurby and two at Kirkmichael has been processed to extract beetle fossils; all three locations yielded rich faunas. Inferences derived from knowledge of the present-day ecology of the fossil species suggest that all three deposits accumulated during a period of fluctuating climate and associated local environmental changes. The initial very cold period immediately after deglaciation was followed by a sudden climatic amelioration which took less than 100 years; the subsequent temperate interlude of approximately 1,000 years was brought to an end by two consecutive periods of cooling, after which temperatures were again similar to those of the earliest post-glaciation stage. Comparison of these results with fossil beetle studies from other Late-glacial sites in Britain shows that analogous changes took place elsewhere. Comparisons with palaeobotanical investigations suggest that, during periods of very rapid climatic change, beetles are more reliable than plant fossils as indicators of prevailing conditions. A modified scheme for subdivision of the British Late-glacial is proposed, based on evidence from insect faunas and stratigraphy, and some possible causes of Late-glacial climatic change are reviewed. Computer analysis of some Late-glacial faunas has been initiated, and the methods and some preliminary results are briefly described.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available