C. Barnard

Publications165
h-index44
Citations7,147
Highly Influential Citations272
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Producers and scroungers: A general model and its application to captive flocks of house sparrows
TLDR
A mathematical model is presented which shows whether or not scroungers are maintained in a group, depending on their frequency and the group size, and tests in captive flocks of house sparrows found scrougers fared better when one of more producers were present. Expand
Kleptoparasitism in birds
TLDR
It is shown that intraspecific food-stealing is effectively the same behaviour as kleptoparasitism, which is likely to involve frequency-dependent selection and may be an example of an evolutionarily stable strategy. Expand
Animal Behaviour: Mechanism, Development, Function and Evolution
TLDR
This chapter discusses the development of human behaviour from genes to behaviour, which involves mating and parental care, and the role of motivation and cognition in this process. Expand
A phylogenetic perspective on the evolution of altered host behaviours: a critical look at the manipulation hypothesis.
Male crickets increase sperm number in relation to competition and female size
Abstract There is evidence to suggest that males of various species can respond to the threat of sperm competition by varying the amount of sperm transferred during copulation. We tested this in two… Expand
Housing and welfare in laboratory rats: effects of cage stocking density and behavioural predictors of welfare
TLDR
Major differences in intercorrelated behavioural and pathophysiological responses between replicate groups implied that the individual composition of groups rather than their size had the greater impact on the welfare of the rats, especially among females. Expand
Flock feeding and time budgets in the house sparrow (Passer domesticus L.)
TLDR
The risk of predation was apparently higher in the fields where birds scanned more frequently than in the cattlesheds and where scanning was negatively influenced by flock size but positively influenced by distance from cover. Expand
Dominance hierarchies and the evolution of "individual recognition".
TLDR
Assessment of the probable outcome of future encounters is likely to be the best way of economizing energy and risk of injury and no distinction can be drawn between assessment involving so-called individual recognition and that involving “simpler” cues. Expand
Variation in the helminth community structure in bank voles (Clethrionomys glareolus) from three comparable localities in the Mazury Lake District region of Poland
TLDR
It is concluded that even locations in relative close proximity to one another, selected on the basis of similar habitat quality, have rodent populations that differ in their helminth parasite communities, although for reasons other than the factors quantified in the present study. Expand
Acquisition of dominance status affects maze learning in mice
TLDR
Investment in learning will vary with individual life history strategy and the reproductive value of the learning outcome, and the results appeared to reflect a state-dependent change in learning associated with the aggressive social relationships formed during pairing. Expand
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