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• W2912308268 abstract "Mutualistic interactions between species are balanced on a delicate scale of net benefits to both interacting partners. The dynamics of such interactions could change depending on the context in which these interactions occur. One of the most well-studied models for interspecies mutualisms are myrmecophytic systems, also known as ant-plant systems, where the host plant (myrmecophyte) provides shelter (domatia), solely or along with food resources, for ant partners, while the domatia-resident ants intensively patrol and protect the host plant from herbivory. In some cases, nutrient flux has also been reported from the ant-derived debris in the domatia to the host plant. Such mutualisms are often vulnerable to exploitation by non-mutualist organisms or interlopers such as non-protective ants and other invertebrates that use the plant rewards without any returns. Since provision of domatia and food imposes costs on the host plants, the trajectory of evolution in such cases where protection is partial or absent needs investigation to understand the evolution of myrmecophytism. In this thesis, we investigate the possibility of evolution of myrmecophytism in the absence of universal protection by partner ants, using the unique semi-myrmecophyte (domatia are not expressed in all individuals of the species) Humboldtia brunonis as the study model. H. brunonis is endemic to the tropical wet evergreen forests of the Western Ghats of India. Being locally abundant in its distribution range, this plant species has also been used in characterising forest types in the Western Ghats. H. brunonis provides domatia (modified stem internodes) and food for ants in the form of extrafloral nectar (EFN) on leaves and bracts of floral buds in all individuals. Each domatium has a self-opening slit, which could have led to the domatia being accessed and inhabited by numerous ants and other non-ant invertebrates throughout its distribution range. Of these, only one ant species, Technomyrmex albipes, has been reported to be significantly protective against herbivores, and the protection received by the plant is reported to be restricted only to one site where T. albipes is most abundant. In the light of the above, the possible explanation for continued expression of rewards (domatia as well as EFN) in the absence of universal protection was investigated. Chapter 1: Introduction This chapter starts with a brief history of the concept of mutualism, evolution and maintenance of mutualism, and trophic mutualism amongst organisms in general. This is followed by a description of ant–plant mutualisms, and the various interactions that drive the interaction in such systems, with a more detailed emphasis on trophic mutualism in ant-plants, and stable isotope analysis as a technique that is used to study trophic mutualism in ant-plants. The study system, Humboldtia brunonis is introduced, and all the studies on this system preceding this current thesis are discussed in the light of findings in other ant-plant systems. Lastly, the objectives of the…" @default.
• W2912308268 created "2019-02-21" @default.
• W2912308268 creator A5083577640 @default.
• W2912308268 date "2017-12-10" @default.
• W2912308268 modified "2023-09-23" @default.
• W2912308268 title "A Farewell to Arms : Dynamics of Interactions between the Unique Semi-myrmecophyte Humboldtia Brunonis (Fabaceae) and its Domatia-inhabitants in the Absence of Universal Protection Mutualism" @default.
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