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The comments of two anonymous reviewers greatly improved this manuscript. You must be a registered user to use the IMDb rating plugin. Nestboxes were laid out in a grid, with an inter-nestbox distance of c. Haematocrit increased in response to brood enlargement, suggesting a response to the requirement of elevated oxygen-carrying capacity of the blood during increased work load. Mass-specific resting metabolic rate of marsh tit nestlings in relation to an index of flea abundance in the nest after fledging. This file is made available under the Creative Commons CC0 1. Close mobile search navigation Article navigation.
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Since beak length is known to be associated with food availability, the researchers speculate that the U. The traveler's dilemma demonstrates the paradox of rationality Thus, the slope of the relation between RMR and mass would be more shallow for control nestlings than for flea-manipulated nestlings, resulting in a significant interaction between treatment and mass in relation to RMR. Beside the experimental effect, other variables explained some of the variation in mean mass at different ages Table 1. Before reaching definite conclusions about potential functional explanations underlying the detrimental effects of ectoparasites, data on nestling rate of food intake and diet selectivity in connection with the manipulation as well as nestling body temperature are needed.
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Preliminary report on the breeding season | BTO - British Trust for Ornithology

And, even if somebody did think it, why on earth would they put it in writing? This is a larger scale problem ranging beyond blue tits as it extends to all species where brown pigmentation has been studied with different methods to date e. Login Through Your Library. Tits a Wonderful Life Video Yes that is right, this is a species where every last one of them has blue balls all the time. We paid particular attention to the correlations between the pigmentation indices - used to test both the potential structural and signaling functions of spottiness e.
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The hematophagous hen flea is a common ectoparasite on adults and nestlings of cavity-breeding passerines such as tits. The first artificial photonic crystal was fabricated in , and since then has become one of the hottest areas in optics. In this male-trait model, yolk antibody concentration was still significantly related to egg volume and clutch size residuals. This precludes an effect of altered nestling behavior in response to parasitism because RMR was measured during night when the nestlings are inactive in the respiratory chamber. National Institutes of Health website.
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