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Title: Dynamics of the guild structure in the parasitoids and inquilines of alien gall wasp, Andricus quercuscalicis Burgsdorf
Author: Schonrogge, Karsten
ISNI:       0000 0004 2743 2655
Awarding Body: Imperial College London
Current Institution: Imperial College London
Date of Award: 1994
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Rapid and substantial changes have occurred in the parasitoid and inquiline community associated with the agamic galls of Andricus quercuscalicis in Britain since the insect arrived in southern England. Over the last 5 years the species composition converged to that recorded from galls from the native range. High rates of attack by inquilines, virtually absent in previous surveys, were recorded in south-east England, but not at the edge of the invaded range. Inquiline abundance was positively correlated with parasitoid species richness, because most parasitoid species concentrated their attack on inquilines. An examination of the guild structure sampled in different parts of the native and invaded range revealed continuous trends away from the native range in a number of community and food-web parameters. The abundance patterns of 4 parasitoid species attacking the gall-maker, and 2 parasitoid species attacking inquiline larvae, were related to: 1) gall morphology; 2) the geographical location of the sample sites; and 3) the abundance of other members of the guild. While parasitism of the agamic galls was low (<5% in Britain, <15 % in the native range), ten parasitoid species caused local mortalities up to 80% in the sexual galls of A. quercuscalicis collected in the native range. An analysis for spatial variation in density dependent abundance patterns showed both positive and negative density dependence as well as density independent relationships between parasitism and host density at all spatial scales and for all parasitoid species. A comparison between the distributions of A. quercuscalicis and two other invading gall wasps, Andricus kollari and A. lignicola, showed that A. quercuscalicis was the only species positively associated with the presence of Turkey oak (an obligate host tree) and suggests that A. quercuscalicis exhibits the lowest rate of spread.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available