- Title
- Population, communication and habitat comparisons between the major gummivorous strepsirhines of Madagascar (phaner) and Cameroon (euoticus)
- Creator
- Forbanka, Derick Nomuh
- Subject
- Adaptation (Biology) Mammals--Evolution Mammals--Behavior
- Date Issued
- 2016
- Date
- 2016
- Type
- Thesis
- Type
- Doctoral
- Type
- Zoology
- Identifier
- http://hdl.handle.net/10353/15957
- Identifier
- vital:40567
- Description
- The suborder Strepsirhini contains a large proportion of the living gummivorous mammal taxa, and includes two genera of specialist gummivores, Euoticus and Phaner, which present particularly interesting cases of convergent adaptive evolution in Africa and Madagascar, respectively. Although these genera are not closely related, they share several anatomical, behavioural and physiological specialisations associated with their diets, and despite their biogeographical separation, there seems to be substantial coincidence in their habitats and habits. Neither the ecology nor the systematics of Phaner and Euoticus has been the subject of much detailed research, and little is known of the conservation status of the genera. Even their specific diversity is unresolved. In this study I investigated and compared aspects of their ecology at both a macro-and a microhabitat scale, including wild populations of all groups within the two genera that have been accorded species status in recent field guides and systematic reviews. I also studied aspects of their social communication behaviour as clues to their species-level diversity. Species and their formation (or speciation) have inspired a great deal of evolutionary research, but remain contentious issues in evolutionary biology. This is due both to the difficulties inherent in inferring the details of a dynamic biological process that occurred over some time in the past from the recent, relatively static patterns of variation observed, as well as the limited consensus among biologists in identifying such patterns. It is therefore important to distinguish the kinds of patterns in nature that are predicted by different views of species and speciation, and also to see how well these predictions fare when applied to the speciation patterns found in strepsirhine primates. Theories of speciation cannot be separated from species concepts, and one concept widely supported in primatology is the Recognition Concept of species because of its heuristic nature. The Recognition Concept is based on Specific-mate Recognition Systems (SMRS). I focussed on SMRS features of Euoticus and Phaner, loud call specificity, and species’ preferred habitats. My results provided some support for the distinctiveness of currently identified species, although this was not clear-cut. Population densities of both Phaner and Euoticus appear to have declined in recent years, even though both Phaner and Euoticus appear to be well adapted to both primary and secondary forest, and exhibit ecological plasticity. Statistically some loud call parameters vary among the putative species of the genus Phaner and not Euoticus. Phaner pallescens at Kirindy, Madasgascar was clearly able to discriminate loud calls of its own population from other proposed species within the genus. Most loud call parameters did not show any statistical degradation with increasing distance. A crucial finding of my study was that the two lineages are not only convergent in terms of dietary and locomotor aspects of their ecology, but also in the structures of their loud calls. The environmental adaptation of communication systems is often overlooked when studying adaptive convergence, but my study indicates that acoustic properties are a crucial aspect of a species’ preferred habitat. The results of this study can be used to improve conservation planning, and also add to our understanding of the evolutionary history of strepsirhine primates.
- Format
- 203 leaves
- Format
- Publisher
- University of Fort Hare
- Publisher
- Faculty of Science and Agriculture
- Language
- English
- Rights
- University of Fort Hare
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UFH Department of Zoology & Entomology
| Thumbnail | File | Description | Size | Format | |||
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