Search for dissertations about: "Formica ants"
Found 4 swedish dissertations containing the words Formica ants.
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1. Phylogeographic Structure and Genetic Variation in Formica Ants
Abstract : The aim of this thesis is to study phylogeny, species-wide phylogeography and genetic diversity in Formica ants across Eurasia in connection with the history of biotic responses to Quaternary environmental changes.The mitochondrial DNA phylogeny of Palaearctic Formica species supported the subgeneric grouping based on morphological similarity. READ MORE
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2. Effects of Social Organisation on Spatial Genetic Structures in Formica Ants
Abstract : The social organization of social insect colonies can be broadly defined as monogynous, single reproductive female or polygynous, several reproductive females. Monogynous organization is genetically simple while polygynous is more complex and the two social forms differ commonly in mating and dispersal behaviour as well as in colony foundation. READ MORE
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3. Adaptive significance of queen mating frequency in ants : In search of benefits of genetic variability
Abstract : Fitness effects of polyandry, multiple mating by females, were studied on two ant speciesLasius niger and Formica truncorum. Particular emphasis was put on evaluating diploid male load, which happens when homozygosity in the sex determination locus leads to intendedfemales developing into sterile, diploid males. READ MORE
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4. Interactions between ants and pine weevils : effects on forest regeneration
Abstract : Ants interact with plants in various ways and ant presence on plants can decrease local abundance or activity of herbivores, which in turn increases plant fitness. Red wood ants (Formica rufa group) are common species in forests of northern Europe. READ MORE