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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
11

BODY TEMPERATURE, EVAPORATIVE WATER LOSS AND ACCLIMATION IN POLISTES WASPS

Williams, Michael Shelby, 1954- January 1986 (has links)
No description available.
12

The figs (Ficus spp.) and fig wasps (Chalcidoidea) of Hong Kong

Hill, Dennis S. January 1966 (has links)
published_or_final_version / Zoology / Doctoral / Doctor of Philosophy
13

The population ecology of an invasive social insect, Vespula germanica (Hymenoptera : vespidae) in South Australia /

Kasper, Marta L. January 2004 (has links) (PDF)
Thesis (Ph.D.)--University of Adelaide, School of Earth and Environmental Sciences, Discipline of Environmental Biology, 2004. / "April 2004" Bibliography: leaves 152-171.
14

Polymorphism and fighting in male fig wasps

Vincent, Stephanie Louise January 1992 (has links)
Male fig wasps (Hymenoptera: Chalcidoidea) exhibit a fascinating range of morphology and behaviour. A cluster analysis, based on descriptions of the males of several hundred species, distinguished six major morphological groups. Behaviourial observations suggest that male morphology is related to the levels of inter-male aggression. Three behaviourial groupings were identified. Fighting species generally mated in the fig cavity, pacifist species mated in the females' galls or outside the figs. Mating sites are thus the primary determinants of male morphology and behaviour. In fighting species males were larger than their females, whereas pacifists and aggressors were equal in size or smaller than conspecific females. The large males in fighting fig wasps appear to be a consequence of sexual selection because larger males tended to win fights. Within a species there were no differences in the size of the galls that produced males and females, even in species where sexual size differences were present, suggesting that there is a heritable component to wasp size. No alternative advantages for smaller males were detected. Although fights were sometimes fatal, damage was not always a consequence of fighting behaviour and was recorded in both fighting and pacifist species. Sex ratios in several species were more female biased at higher population densities. Sex ratios of species with 'internally' ovipositing species were heavily female biased, but approached 1:1 in more outbred species with 'externally' ovipositing females. Levels of matedness, among females ranged from 73% to 99%. No evidence for sperm exhaustion was obtained. Species of Philotrypesis with both winged and flightless males were present only in southern African Ficus species from subsections Platyphyllae and Chlamydodorae. No species had only winged males. The flightless males of some Philotrypesis species were themselves polymorphic. In one polymorphic Philotrypesis species, winged males were found to be rare at high densities, but common at low densities. Digitata and religiosa males of Otitesella differed in coloration, size and behaviour. Digitata males were aggressors while religiosa males were fighters. Digitata males escaped from the figs whereas religiosa males remained inside the figs, perhaps because only digitata males were attracted to Light. Proportionally more digitata than religiosa males were present in low density populations and females were found to respond differently to the two morphs.
15

COMPARATIVE MORPHOGENESIS OF CYNIPID LEAF GALLS INDUCED BY Diplolepis polita AND Diplolepis nebulosa (HYMENOPTERA: CYNIPIDAE) AND MODIFICATION BY INQUILINES OF THE GENUS Periclistus (HYMENOPTERA: CYNIPIDAE)

Fenwick, Brandy 30 July 2013 (has links)
Cynipid galls are atypical plant growths induced by wasps in the family Cynipidae that provide larvae with shelter and nutrition. Larvae gain control of attacked plant organs and send them on a new developmental trajectory, with three developmental phases known as initiation, growth, and maturation. Each of the approximately 1400 species of cynipid gall wasps manipulates plant tissues in a slightly different manner such that galls of each species are structurally distinct. Although the means by which cynipids initiate galls has fascinated naturalists for hundreds of years, the basic events in gall induction are still poorly understood. In an attempt to understand the galling strategies and developmental processes responsible for species-specific galls, I chose to compare the intimate details of life history strategies of two taxonomically related species attacking the same plant organs. The strategies included host specificity, phenology, and oviposition strategies, along with gall development to highlight basic events in gall biology and reveal possible stages in past speciation events. It is argued that differences in phenology and gall development played a role in driving speciation and thus, the patterns observed today are a result of extensive ecological interactions in the past that have influenced the evolution of these complex insect-plant relationships. Two species of cynipid wasps of the genus Diplolepis that occur on the wild roses of central Ontario proved to be ideal candidates for the study. One species, Diplolepis polita, induces single-chambered, prickly galls found in clusters on the adaxial surface of leaflets of Rosa acicularis whereas, the other species, D. nebulosa, induces single- iv chambered, smooth-surfaced galls found in clusters on the abaxial surface of the leaflets of Rosa blanda. Galls at all stages of development, from freshly oviposited eggs to maturation, were found in large numbers for both species. Leaf tissues from the bud stage to maturity of both species of rose were fixed in FAA, embedded in paraffin, sectioned and stained for histological study. Likewise, leaf tissues with freshly oviposited eggs of both species and galls from immaturity to maturity were fixed, sectioned, and stained. Comparing the several thousand slides made for the study revealed that galls of D. polita and D. nebulosa differ in their developmental events as well as the anatomy of their mature galls. Like the galls of all species of cynipids, those of D. polita and D. nebulosa are composed of distinct layers of gall cells known as nutritive, parenchymatous nutritive, sclerenchyma, cortex, and epidermis. Galls of D. polita consist of nutritive cells, parenchymatous nutritive cells, and an epidermis throughout the initiation and growth phases. Larvae remain small in relation to chamber volume until the maturation phase, when a hard layer of sclerenchyma differentiates. In contrast, galls of D. nebulosa have a delayed initiation phase, where galls remain nearly undetectable on leaflets for several weeks after oviposition before they enter the growth phase. Freshly-hatched larvae are protected by two layers of bowl-shaped patches of sclerenchyma that differentiates soon after initiation, along with nutritive cells and parenchymatous nutritive cells that surround the larval chambers, but galls of this species develop without an external layer of epidermis. Galls become spherical as they mature and a second layer of sclerenchyma differentiates within the walls of the galls, as does a layer of spongy cortex that appears between the second layer of sclerenchyma and the gall exterior. Larvae of D. nebulosa occupy nearly the entire volume of their larval chambers throughout gall development. v The size of each type of cell found within developing galls of both species, from gall initiation to gall maturity were measured and compared. Cells in the galls of both species continue to increase in size throughout development; however, the cells comprising the galls induced by D. polita are significantly larger than those induced by D. nebulosa. Comparing the biologies and galls of these two species, demonstrates how niche partitioning has occurred. It also shows that striking differences in structures occur within the galls of closely taxonomically related species as a result of differences in adult phenology, oviposition strategies, egg placement, and environmental conditions such as moisture levels. Although it has been proposed by other authors that diversity in cynipid galls results from differentiation of tissues found in the outer parts of galls, such as cortex and epidermis, the present study indicates the reasons are more complex. Furthermore, it is apparent that many aspects of gall development and anatomy have been overlooked by previous researchers and a variety of ecological factors contribute to differences in gall structure. To further complicate the already complex series of events that occur over the course of gall development, galls of D. polita and D. nebulosa are inhabited and structurally modified by inquilines of the genus Periclistus. These insects are also cynipid wasps, and have evolved a close relationship with Diplolepis galls whereby they kill the inducer larvae, feed on gall cells, and change the developmental trajectory of attacked galls. Galls of D. polita and D. nebulosa are attacked by two undescribed, but gall-specific species of Periclistus. Here, the inquiline associated with the galls of D. polita is referred to as Periclistus 1 and the inquiline associated with galls of D. nebulosa is referred to as Periclistus 2. The purpose of this study was to histologically examine all phases of vi modification by the two species of Periclistus to establish the events that are developmentally unique to inquilines. Periclistus 1 and 2 are phenologically distinct as Periclistus 1 oviposits into immature galls of D. polita in late May soon after galls are induced, and Periclistus 2 oviposits into immature galls of D. nebulosa in July. Modified galls of D. polita differ from modified galls of D. nebulosa as they are significantly enlarged compared to normal galls. Periclistus 1 chambers are arranged around the periphery of the inner gall whereas modified galls of D. nebulosa are of a similar size to normal galls. Chambers of Periclistus 2 are evenly distributed throughout the inner gall. Periclistus 1 and 2-modified galls undergo four phases of development identified as the egg phase, gall enlargement, chamber formation, and maturation phases. Both Periclistus 1 and 2 oviposit into immature galls, killing the inducer larvae with their ovipositors, and then the presence of Periclistus eggs along the inner chamber surface cause changes in gall structure. Diplolepis-induced nutritive cells degrade and Diplolepis-induced parenchymatous nutritive cells enlarge. Galls become significantly enlarged compared to those inhabited by inducer larvae and then feeding by first-instar Periclistus larvae stimulates the differentiation and proliferation of Periclistus-induced parenchymatous nutritive cells and nutritive cells. Immature larvae of both species of Periclistus initially feed around the inner surface of the Diplolepis-induced chamber, and then restrict their feeding to one spot. This results in cell proliferation such that each larva becomes restricted to the centre of a bowl-shaped growth of cells. Continued proliferation causes Periclistus nutritive and parenchymatous nutritive cells to rise up and completely encase the larvae. As this is occurring in modified galls of D. polita, a layer of sclerenchyma, referred to here as the vii inquiline-induced primary sclerenchyma, differentiates and circumscribes the periphery of the entire gall. This does not occur in galls of D. nebulosa until maturity. In modified galls of both species, nutritive cells and parenchymatous nutritive cells appear in dense clusters throughout the inside surface of Periclistus chambers. Once modified galls enter the maturation phase, inquiline-induced primary sclerenchyma differentiates, circumscribing the periphery of galls of D. nebulosa. In addition, Periclistus 1 and 2-inhabited galls both develop a second layer of inquiline-induced sclerenchyma, known as secondary sclerenchyma, around each inquiline chamber. Secondary sclerenchyma cells in the walls of Periclistus chambers are smaller than primary sclerenchyma cells circumscribing the entire gall. Gall cells induced by Periclistus 1 are larger than those induced by Periclistus 2; however, gall cells induced by both species of Periclistus are larger than those of their host Diplolepis galls. Based on differences in phenology, gall development, and final gall structure, modified galls of D. polita and D. nebulosa are anatomically distinct with each species of Periclistus responsible for gall tissues that are species-specific. In addition, the developmental pattern of Periclistus-modified galls is distinct from that of Diplolepis galls, illustrating the level of control inquilines have over the tissues of their host galls. This thesis demonstrates the complex nature of the interrelationships between cynipid wasps of the genera Diplolepis and Periclistus and their host roses. Diplolepis are true gall inducers that have an intimate relationship with the genus Rosa and there are many attributes of the genus Rosa that have contributed to the success of Diplolepis and allowed for their extensive radiation and divergence in their galls. Similarly, Periclistus viii inquilines have an intimate relationship with Diplolepis and the rose hosts. Periclistus have evolved the ability to manipulate rose tissues that have previously been under the influence of Diplolepis. Based on two species of inquilines examined in this thesis, Periclistus have also evolved an array of phenologies and modification strategies and like the developmental patterns of the Diplolepis, the developmental trajectories of Periclistus are also species-specific. This project has shown that the histological approach to studying cynipid galls, as well as those occupied by Periclistus inquilines, is highly rewarding and contributes to our overall understanding of these fascinating insects.
16

The population dynamics of host-host-parasitoid system

Casey, Abigail Nyree Jane January 1999 (has links)
No description available.
17

Reproductive strategies in parasitic Hymenoptera

West, Stuart Andrew January 1995 (has links)
No description available.
18

The behavioural ecology of strepsipteran parasites of Polistes wasps

Hughes, David January 2003 (has links)
No description available.
19

Discovery, description and biology of new parasitoid wasp species from the eastern Andes of Ecuador

Townsend, Andrew C. January 2007 (has links)
Thesis (M.S.)--University of Wyoming, 2007. / Title from PDF title page (viewed on June 16, 2008). Includes bibliographical references (p. 69-74).
20

Revision of the Nearctic species of the pompilid genus Pepsis (Hymenoptera, Pompilidae)

Hurd, Paul David, January 1952 (has links)
Thesis--University of California. / Bibliography: p. 328-334.

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