Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 81 for “"Foraging behaviour"”.
-
The foraging behaviour of granivorous birds: a mechanistic perspective.
… The functional response is often central to behavioural-based population models that predict the effect of environmental changes on populations based on the assumption that each individual tries to maximise its fitness at all times. 2. The functional response is a well studied phenomenon for …
-
Environmental determinants of greater flamingo foraging behaviour in an estuarine intertidal sandflat
… still very little known about flamingo spatial foraging preferences and the environmental cues that determine them. The purpose of this study was to investigate the foraging distributions of non-breeding Greater Flamingos (Phoenicopterus ruber roseus) within one of their southern African …
-
Plasticity and partitioning of foraging behaviour among and within sympatric Pygocelis penguin populations
… such as breeding seabirds, need to adjust their foraging behaviours in response to the growth and development of their offspring. As a result, they need to return to their nests regularly. These breeding constraints limit their foraging ranges. In the Southern Ocean, sympatrically breeding …
-
Energy budget and foraging behaviour of the Cape gannet Morus capensis during the breeding season
This thesis deals with the energy expenditure of free-ranging Cape gannets Morus capensis breeding at Malgas Island, South Africa. I sought to determine the energy budget of family units and to extrapolate this to the whole population. Energy expenditure was measured using the doubly labelled water …
-
Indirect effects of agricultural intensification on tree swallow (Tachycineta bicolor) foraging behaviour, body condition, and physiology
… breeding tree swallows respond in terms of (i) foraging behaviours and return rates, (ii) body condition, and (iii) selected physiological responses (i.e. oxidative stress and feather corticosterone). Artificial nest-boxes were erected at each of 5 sites with varying levels of agricultural …
-
An empirical and theoretical investigation of kleptoparasitic foraging behaviour in mixed-species aggregations of gulls (Laridae)
… investigated kleptoparasitism in mixed-species foraging aggregations of gulls (Laridae). Kleptoparasitism, or food stealing, is a strategy used frequently by gulls. Gull populations are increasing in urban areas despite declining overall. Understanding the role of kleptoparasitism in aiding …
-
Factors influencing the foraging behaviour of African Penguins (Spheniscus demersus) provisioning chicks at Robben Island, South Africa
… provided an opportunity to investigate penguin foraging behaviour in relation to estimated local prey abundance and other factors without the confounding variable of local fishing. Penguins provisioning chicks were equipped with GPS temperature depth devices for a foraging trip. Dive data (N = …
-
Environmental and social influences of foraging behaviour and maternal investment with a note on the mating frequency of the eastern carpenter bee, Xylocopa virginica
… studies how weather and sociality influence the foraging effort input costs of brood production, and that multiple mating contributes to low-group relatedness and non-kin sociality in the Eastern carpenter bee, Xylocopa virginica. In Chapter 2, using a natural experiment which included a drought …
-
Linking foraging behaviour of post-breeding adult female elephant seals from Marion Island to physical dynamics and productivity at the South-West Indian Ridge
… data loggers (CTD-SRDL's) and their foraging behaviour was examined in relation to different chlorophyII-a concentrations. Optimal foraging and area restricted search theories predict that travelling speed and turning frequency would be quantifiably affected by prey density, which is …
-
Factors affecting the activity patterns of Myotis tricolor (Chiroptera: Vespertilionidae)
Foraging behaviour is an important component of an animal’s ecology. Increases in energetic costs associated with reproduction, should have marked effects on foraging behaviour, but may be compounded by the effects of environmental factors. I investigated the activity patterns of female M. tricolor …
-
Drivers of variation in the migration and foraging strategies of pelagic seabirds
… of variation in movements, habitat use and foraging behaviour, and the implications for life history and conservation. In Chapter 1, I provide an overview of the key topics of this thesis. In Chapter 2, I provide quantitative recommendations of minimum sample sizes needed to track pelagic …
-
The feeding ecology of curlew sandpipers Calidris ferrugineol in the South - Western Cape, South Africa
… changes in the diet of curlew sandpipers foraging in the intertidal sandflats and marshes were studied, and the food taken by male and female, and immature and adult, birds was compared. The daily and seasonal activity of curlew sandpipers was monitored during March 1974 - March 1975 and …
-
Patch exploitation and defence in the egg parasitoid Trissolcus basalis Wollaston (Hymenoptera : Scelionidae) / Scott A. Field.
… important areas of research in parasitoid behavioural ecology, including the theories of adaptive superparasitism, sex ratio decisions, foraging behaviour and contest resolution.
-
Comparative foraging ecology of two broad-ranging migrants, grey plover Pluvialis Squatarola and whimbrel Numenius Phaeopus (Aves: Charadrii), in tropical and temperate latitudes of the Western Indian Ocean
A seasonal study of the nonbreeding foraging ecology of Grey Plovers and Whimbrels was undertaken at the Zwartkops estuary, South Africa, and additional data were collected from a variety of sites in tropical and south temperate latitudes during the premigratory period. The main objective of the …
-
Investigating the physical and ecological drivers of change in a coastal ecosystem: from individual to population scale impacts.
… (IBM) and consideration of the species’ unique foraging behaviour. This study contributes to the understanding of the factors structuring soft sediment benthic communities, including the use of data from fine-scale hydrodynamic models. It offers a unique comparison of the spatial and temporal …
-
Factors affecting habitat separation in the pallid flycatcher Melaenornis pallidus and Marico flycatcher Melaenornis mariquensis
… and resource conditions on the flycatchers' foraging behaviour (Section I) and other aspects of their ecologies (Section II) with the aim of evaluating the relative importance of these effects in maintaining habitat separation between the two species.
-
Foraging ecology of the African Penguin Spheniscus demersus in relation to ocean physical processes.
… our knowledge base of the African Penguins foraging ecology. African Penguins show flexibility in their foraging behaviour by adjusting their dive behaviour to subsurface thermal structures. Penguins also demonstrated foraging optimization by using temperature cues and behavioral switching …
Page 1 of 5