In this thesis, I describe the behavioural ecology of an Australian passerine, the Southern Emuwren Stipiturus malachurus (Maluridae). The southern emu-wren is threatened in several parts of its range, and yet information on the species’ breeding biology, habitat use and mating system is lacking. These data are fundamental to effective conservation management. My research investigated the breeding behaviour and habitat ecology of a population of southern emu-wrens in Portland, Victoria, Australia, over three breeding seasons (2000/01, 2001/02 and 2002/03). also collected data pertaining to habitat use from populations located in Anglesea and Lower Glenelg National Park (Victoria, Australia). Southern emu-wrens commonly formed socially monogamous pair bonds, although cooperative breeding was observed for the first time in this species, where male offspring within several families delayed breeding to help raise younger siblings. Successful nests produced 1.8 fledglings on average, however, a nest had only a 56% chance of success during incubation and nestling phases. Nest failure was mainly attributed to depredation and snakes were identified as major nest predators. The slow breeding rate of the southern emu-wren is typical of a small passerine in the Southern Hemisphere. Nevertheless, adult mortality was unusually high. In one breeding season the adult population was reduced by 50%. The population recovered when individuals dispersed from the adjacent coastal heathland to fill territory vacancies. This highlights the vulnerability of populations to local catastrophe, and potential extinction if spatial separation of populations exceeds the species’ dispersal capacity.
| Identifer | oai:union.ndltd.org:ADTP/245081 |
| Creators | Maguire, Grainne S. |
| Source Sets | Australiasian Digital Theses Program |
| Language | English |
| Detected Language | English |
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