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Free time in birds

Wubs, M.D. (2010) Free time in birds. Bachelor's Thesis, Biology.

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Abstract

The proportion of maximal daily metabolizable energy (DMEmax) birds spend differs per bird according to Masman et al. (1989). The daily energy expenditure for small birds is closer to their DMEmax compared to big birds. In this study I will examine if this difference reflects in the free time of a bird, by gathering time budgets from various bird species and calculate the average amount of free time these birds have. Free time is generally defined as resting (but not sleeping or roosting) and perching (a low energy demanding form of hunting). In total 16 species have been examined. The results show that there is no correlation between the mass of a bird and the time it is free. A pattern is visible however, and removal of the 2 greatest outliers did make the correlation significant. The pattern disappeared when sexes were split, but sample sizes were reduced. A negative correlation was found between foraging time and free time, showing that birds that rest more spend less time foraging. Increasing the amount of data on time budgets and the protocol on how these are assessed is needed to either verify or abandon the hypothesis that mass and free time are connected.

Item Type: Thesis (Bachelor's Thesis)
Degree programme: Biology
Thesis type: Bachelor's Thesis
Language: English
Date Deposited: 15 Feb 2018 07:44
Last Modified: 15 Feb 2018 07:44
URI: http://fse.studenttheses.ub.rug.nl/id/eprint/9410

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