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The integration of spatial-ecology and animal behaviour in the unpredictable arid zone: a case study with the zebra finch

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posted on 28.03.2022, 20:35 authored by Caterina Funghi
Unpredictable environments present several challenges for animals that need to gather information to track ecological fluctuations to ensure access to resources and optimise life-history decisions. Part of the environmental unpredictability is linked to a heterogeneous distribution of resources, both temporally and spatially. Additionally, extreme climatic events (e.g. heatwaves) can prove physiologically and behaviourally challenging. In my thesis I integrated approaches from spatial and behavioural ecology to overcome current difficulties in the study of animal behaviour in the Australian arid environment. I focused research on wild zebra finches (Taeniopygia guttata) foraging behaviour. Insight into environmental heterogeneity came from classical vegetation surveys and the most up-to-date freely available remote sensing data, focusing on the spatial distribution of the primary nutritious source for the zebra finch - Enneapogon grasses. Enneapogon abundance and productivity varied at a local scale, both temporally and spatially, primarily driven by local environmental determinants. This variation was detectable using Sentinel - 2A imagery, although with some limitations, validating its use in Australian arid areas, as tool for understanding primary productivity . Furthermore, I demonstrated that in arid landscape, zebra finches have to overcome the challenge of finding food in a patchy environment and cope with extreme climatic conditions. I demonstrated that over two consecutive heatwave events, zebra finch temporal, social and spatial foraging patterns were constrained by the heat. Finally, by experimentally manipulating both food availability and brood size I demonstrated variation in individual foraging behaviour, with some birds using a greater variety of food sources and more persistently checking depleted patches. This behavioural variation in foraging strategy related to reproductive success, providing empirical support for optimal foraging theory . Overall, my results promote the use of a spatial framework for the study of animal behaviour to given valuable insight to the challenges and constraints individuals face in harsh, heterogeneous and unpredictable habitat.

History

Table of Contents

Chapter 1. General Introduction / Funghi Caterina -- Chapter 2. Characterization of spatial and temporal heterogeneity in grass productivity across an Australian arid landscape / Funghi Caterina, Schuett Wiebke, Griffith Simon C. -- Chapter 3. Sentinel 2: an opportunity to integrate remote sensing and behavioural ecology in the arid zone / Funghi Caterina, Heim Renè€, Schuett Wiebke, Griffith Simon C., Oldeland Jens -- Chapter 4. High air temperatures induce temporal, spatial, and social changes in the foraging behaviour of wild zebra finches / Funghi Caterina, McCowan Luke S. C., Schuett Wiebke, Griffith Simon C. -- Chapter 5. Persistent sampling increases food patch use, but not reproductive success, in wild zebra finches / Funghi Caterina, Schuett Wiebke, Griffith Simon C. -- Chapter 6. General Discussion / Funghi Caterina.

Notes

Theoretical thesis. Includes bibliography

Awarding Institution

Macquarie University

Degree Type

Thesis PhD

Degree

PhD, Macquarie University, Faculty of Science and Engineering, Department of Biological Sciences

Department, Centre or School

Department of Biological Sciences

Year of Award

2019

Principal Supervisor

Simon Griffith

Rights

Copyright Caterina Funghi 2019. Copyright disclaimer: http://mq.edu.au/library/copyright

Language

English

Extent

1 online resource (vii, 8-152 pages) colour illustrations

Former Identifiers

mq:71962 http://hdl.handle.net/1959.14/1279991