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Title: The population biology of two sympatric alien gallwasps and their recruitment of natural enemies
Author: Townsend, lan R.
ISNI:       0000 0004 5356 8345
Awarding Body: University of Reading
Current Institution: University of Reading
Date of Award: 2014
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There remain a number of research gaps in the fields of Population and Community Ecology. These include gaps in our understanding of the population biology of species which exhibit complex life-cycles and life history strategies that might mitigate against environmental variability. There are also gaps in our knowledge of the interactions between newly resident species (e.g. alien species etc.) and communities in their new ranges. The establishment in Britain of two closely related and niche sharing species of alien phytophagous cynipid wasps, Andricus quercuscalicis (Burgsdorf, 1783) (Hymenoptera: Cynipidae) andA. grossulariae (Giraud, 1859) (Hymenoptera: Cynipidae) - both of which have complex life-cycles with nonoverlapping sexual and asexual generations - provide a rare opportunity to address such research gaps. While A. quercuscalicis was first recorded in the British Isles in the 1950s and has been studied extensively since, A. grossulariae established only over the last decade. In Chapter 2, The population biology of two niche sharing alien · I gal/wasps, I ask whether the arrival of A. grossulariae has caused changes in the temporal patterns of galling rates, patterns of diapause, and overwintering mortality to previous observations and fmd that there is some fluctuation in most cases. I also ask if there is now evidence of a competition effect between A. quercuscalicis and A. grossulariae in any stage of their life-cycle and find that there is suggestion of a small competition effect occurring in the sexual generation.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available