Chick growth and prey quality in the European Bee-eater (Merops apiaster) |
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Authors: | John R Krebs Mark I Avery |
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Institution: | 1. Department of Zoology, Edward Grey Institute of Field Ornithology, South Parks Road, OX1 3PS, Oxford, Great Britain
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Abstract: | - In each of four replicate experiments we fed three groups of bee-eater chicks for 24 h on different diets: bees, dragonflies, and a mixture of the two.
- Dry weight assimilation efficiency did not differ between treatments and was in the region of 40–50%. Caloric assimilation efficiency was about 60% and did not differ significantly between diets.
- Mean Growth efficiency (wt. gain/intake) was highest in all four replicates in chicks fed on the mixed diet.
- When metabolic requirements are taken into account, growth efficiency on the mixed diet varies less with variation in intake than on the two pure diets.
- The advantage of feeding chicks on a mixed diet may partly explain why parents do not show exclusive preferences for energy-maximising prey types.
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