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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.
1

Rank and inheritance in a facultatively eusocial hover wasp

Bridge, Catherine Anna Louise January 2005 (has links)
In each L. flavolineata colony only one 'dominant' female reproduces at a given time, but all of the females, apparently, have the potential to achieve dominant status. I provide detailed census data, which shows that the majority of wasps inherit dominance in an age-based manner, i.e. the oldest individual becomes the dominant when the previous dominant dies. However, I also provide evidence of 'cheats' that achieve dominance before older individuals. Focusing upon 'cheating' individuals, I look at their relative size and genetic relatedness in relation to their nestmates to provide clues as to how they are able to 'queue-jump'. This study reveals that queue jumpers tend to be the sisters of wasps they jump in the queue yet queue jumpers are generally no larger than the rest of their nestmates. I then proceed to look at the prior foraging effort of queue jumpers before the queue jump took place. I conclude that queue jumping is an opportunist act performed when the dominant shows cues as to the imminent arrival of her death. I provide data regarding the general genetic structure of L. flavolineata colonies, focusing particularly upon the relatedness of the dominant to subordinate ranks. This study reveals no correlation between rank and relatedness to the dominant. Finally, I look at foraging effort and how it corresponds to rank and group size. Cant and Field (2001) have developed a Kin Selection model in which they predict the optimum levels of foraging effort for a subordinate individual according to its rank and the group size of its nest. L. flavolineata is a suitable species upon which to test this model as rank is revealed to be independent of relatedness to the Dominant. The results shown here are in good agreement with the predictions of the Kin Selection model.
2

The ecology and evolution of fig wasp communities

Segar, Simon T. January 2011 (has links)
I use the fig/fig wasp system to address several questions in the fields of evolutionary and community ecology. I present a general review of speciation and community ecology in insects on plants in general and in fig trees (genus Ficus) and fig wasps (Hymenoptera: Cha1cidoidea) in particular. Following on from this introduction are four experimental chapters. The first experimental chapter investigates the contrasting impact of two genera of parasitic, or non-pollinating fig wasps, on their host Ficus and its pollinating wasps. I present my findings in terms of community ecology and mutualism stability. In the second experimental chapter I describe the community of fig wasps associated with two Ficus species from the Australasian Ficus section Ma/vanthera. Using behavioural, ecological and molecular barcoding data I investigate the host Ficus specificity and trophic role of each genus of wasp. Furthermore I carry out a detailed investigation into the mode of speciation in a key kelptoparasite genus: Sycoscapter (Pteromalidae: Sycoryctinae), highlighting the role of ecological speciation in generating diversity. In the next chapter I present a global multi-gene phylogeny of the subfamily Sycoryctinae before evaluating its age, origins and mode of radiation in relation to other major components of fig wasp communities. The final experimental chapter addresses the assembly of fig wasp communities over evolutionary time. I combine phylogenetic and ecological data from three wasp communities associated with three Ficus species from different continents to investigate the roles of niche stasis and niche lability in shaping community structure. I fmd that overall, general ecological rules appear little constrained by the local pool of insect species in these complex, globally dispersed and multi-trophic communities. A general discussion is presented in the fmal chapter in which I highlight areas for future research and provide closing comments. /.
3

The behavioural ecology of strepsipteran parasites of Polistes wasps

Hughes, David January 2003 (has links)
No description available.
4

Rote Liste und Artenliste Sachsens - Grabwespen

Scholz, Andreas, Liebig, Wolf-Harald January 2013 (has links)
In Sachsen sind bisher 212 Arten Grabwespen nachgewiesen. In der Artenliste und Roten Liste sind sie zusammengestellt und bewertet. Die Rote Liste informiert über die Gefährdungssituation der Arten und Lebensräume und stellt eine Grundlage für die Fachplanung im Naturschutz dar. Rote Listen werden regelmäßig aktualisiert. Eine Rote Liste Grabwespen erschien zuletzt 1995.
5

Rote Liste und Artenliste Sachsens - Grabwespen

Scholz, Andreas, Liebig, Wolf-Harald 27 January 2014 (has links) (PDF)
In Sachsen sind bisher 212 Arten Grabwespen nachgewiesen. In der Artenliste und Roten Liste sind sie zusammengestellt und bewertet. Die Rote Liste informiert über die Gefährdungssituation der Arten und Lebensräume und stellt eine Grundlage für die Fachplanung im Naturschutz dar. Rote Listen werden regelmäßig aktualisiert. Eine Rote Liste Grabwespen erschien zuletzt 1995.

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