Search Results - "Houston, D. C."

Experimental Demonstration That Offspring Sex Ratio Varies with Maternal Condition by Nager, R. G., Monaghan, P., Griffiths, R., Houston, D. C., Dawson, R.

“…Sex ratio theory predicts that, if prevailing ecological or social circumstances differentially influence the fitness benefits of offspring of each sex,…”
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Causes and Effects of Temporospatial Declines of Gyps Vultures in Asia by Pain, D. J., Cunningham, A. A., Donald, P. F., Duckworth, J. W., Houston, D. C., Katzner, T., Parry-Jones, J., Poole, C., Prakash, V., Round, P., Timmins, R.

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The price of eggs: increased investment in egg production reduces the offspring rearing capacity of parents by Monaghan, P., Nager, R. G., Houston, D. C.

“…Understanding the selective pressures shaping the number of offspring per breeding event is a key area in the study of life–history strategies. However, in…”
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Patterns of Yolk Enrichment with Dietary Carotenoids in Gulls: The Roles of Pigment Acquisition and Utilization by Blount, J. D., Surai, P. F., Houston, D. C., Møller, A. P.

“…1. Carotenoid pigments are deposited into egg yolk by female birds, but little is known of the ecological regulation of this process. In particular, the…”
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Within-Clutch Trade-Offs between the Number and Quality of Eggs: Experimental Manipulations in Gulls by Nager, Ruedi G., Monaghan, Pat, Houston, David C.

“…We experimentally increased the number of eggs laid by Lesser Black-backed Gulls and examined the relationship between egg number and egg quality. Egg quality…”
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Flight Muscle Atrophy and Predation Risk in Breeding Birds by Veasey, J. S., Houston, D. C., Metcalfe, N. B.

“…1. The speed with which small birds can get airborne is critical to the effectiveness of their escape response when attacked by a predator. However, take-off…”
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The effect of dietary amino acid composition on egg production in blue tits by Ramsay, S. L., Houston, D. C.

“…Most studies on the interaction between food supply and reproduction in animals have assumed that energy is likely to be the factor limiting egg number and/or…”
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Parental Condition, Brood Sex Ratio and Differential Young Survival: An Experimental Study in Gulls (Larus fuscus) by Nager, Ruedi G., Monaghan, Pat, Houston, David C., Genovart, Meritxell

“…Empirical evidence is growing that the offspring sex ration in birds can be biased in relation to the body condition of parents during breeding. The sex ratio…”
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A Hidden Cost of Reproduction: The Trade-Off between Clutch Size and Escape Take-Off Speed in Female Zebra Finches by Veasey, Jake S., Houston, David C., Metcalfe, Neil B.

“…1. The concept of reproductive costs is a central tenet of life-history theory, but the proximate mechanisms whereby such costs are mediated remain poorly…”
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The Effects of Diet Switching and Mixing on Digestion in Seabirds by Hilton, G. M., Furness, R. W., Houston, D. C.

“…1. Animals modulate digestive function in order to optimize digestion of their current diet. Two seabird species were used to test the idea that, as a result,…”
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Which Components of Diet Quality Affect Retention time of Digesta in Seabirds? by Hilton, G. M., Houston, D. C., Furness, R. W.

“…1. The nature of the diet can affect the gut retention time of food consumed by an animal, and a theoretical framework has been developed to explain this in…”
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A reassessment of the effect of body mass upon flight speed and predation risk in birds by VEASEY, JAKE S., METCALFE, NEIL B., HOUSTON, DAVID C.

“…A number of theoretical studies have predicted that avian predation risk is mass dependent. Models of bird flight predict that increased mass will reduce…”
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Geographical Variation in the Size of Body Organs in Seabirds by Hilton, G. M., Lilliendahl, K., Solmundsson, J., Houston, D. C., Furness, R. W.

“…1. The size of body organs shows adaptive temporal variation in many animal species. The variation in the size of body organs was examined to see if it is also…”
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The Effect of Prebreeding Diet on Reproductive Output in Zebra Finches by Selman, R. G., Houston, David C.

“…Environmental conditions at the time of laying can influence clutch size in birds. Here we show that the quality of diet a female bird receives before the…”
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Obligate vertebrate scavengers must be large soaring fliers by Ruxton, Graeme D., Houston, David C.

“…Among extant vertebrates, only the 23 species of vulture are obligate scavengers. We use an energetic modelling approach to explore the constraints imposed by…”
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Nutritional Constraints on Egg Production in the Blue Tit: A Supplementary Feeding Study by RAMSAY, S. L, HOUSTON, D. C

“…1. The influence of food supply on avian egg production has been investigated in many studies by the experimental provision of supplementary food. Most such…”
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Soil consumption by Elephants might help to minimize the toxic effects of plant secondary compounds in forest browse by Houston, D C, Gilardi, J D, Hall, A J

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Predicting the Spatial Distribution of Buzzard Buteo buteo Nesting Areas Using a Geographical Information System and Remote Sensing by Austin, Graham E., Thomas, Chris J., Houston, David C., Des B. A. Thompson

“…1. Predictive models of animal distributions based on habitat can be used to assess the likely effects of changes in landuse on a species. In this study we…”
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Modelling the energy budget of a colonial bird of prey, the Ruppell's griffon vulture, and consequences for its breeding ecology by Ruxton, G. D., Houston, D. C.

“…Colonial nesting is rare in birds of prey. In this study we develop further Pennycuick's (1979) model of energy balance to consider the implications of…”
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Egg Production Constraints and the Evolution of Avian Clutch Size by Monaghan, P., Bolton, M., Houston, D. C.

“…The aim of this study was to examine whether the capacity of female birds to produce high quality eggs could act as a constraint on the evolution of clutch…”
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