Related Experiment Video
Updated: Mar 6, 2026
08:42
Methods for Comparing Nutrients in Beebread Made by Africanized and European Honey Bees and the Effects on Hemolymph Protein Titers
Published on: March 17, 2015
11.2K
Chick growth and prey quality in the European Bee-eater (Merops apiaster).
1Department of Zoology, Edward Grey Institute of Field Ornithology, South Parks Road, OX1 3PS, Oxford, Great Britain.
Oecologia
|March 18, 2017
Summary
Feeding bee-eater chicks a mixed diet of bees and dragonflies resulted in the highest growth efficiency. This suggests that varied diets, not just energy-maximizing prey, benefit chick development.
Area of Science:
- Avian biology
- Animal nutrition
- Ecological energetics
Background:
- Understanding chick growth and nutritional requirements is crucial for avian conservation.
- Dietary composition significantly impacts the growth efficiency of altricial birds.
Purpose of the Study:
- To investigate the impact of different diets on the growth efficiency of bee-eater chicks.
- To determine if a mixed diet offers advantages over single-prey diets.
Main Methods:
- Bee-eater chicks were fed one of three diets: bees, dragonflies, or a mixture of both.
- Four replicate experiments were conducted over 24-hour feeding periods.
- Dry weight and caloric assimilation efficiencies, along with growth efficiency, were measured.
Main Results:
- Assimilation efficiencies (dry weight and caloric) did not significantly differ across the diets.
- Growth efficiency (weight gain per intake) was consistently highest in chicks fed the mixed diet.
- Growth efficiency on a mixed diet showed less variation with changes in food intake compared to pure diets.
Conclusions:
- A mixed diet provides superior growth efficiency in bee-eater chicks compared to single-prey diets.
- The benefits of a mixed diet may explain observed parental foraging behaviors that do not exclusively target energy-maximizing prey.
- Dietary diversity plays a key role in optimizing chick development and survival.
Related Concept Videos
02:39Predator-Prey Interactions
22.0K
Predators consume prey for energy. Predators that acquire prey and prey that avoid predation both increase their chances of survival and reproduction (i.e., fitness). Routine predator-prey interactions elicit mutual adaptations that improve predator offenses, such as claws, teeth, and speed, as well as prey defenses, including crypsis, aposematism, and mimicry. Thus, predator-prey interactions resemble an evolutionary arms race.
22.0K
01:20Mate Choice
11.9K
Mate choice—the decision about whom to mate with—is a type of natural selection, since animals must reproduce to pass down their genes. Mate choice is also called intersexual selection because the behavior occurs between the sexes.
11.9K
02:07Conservation of Declining Populations
13.5K
Conservation of declining population focuses on ways of detecting, diagnosing, and halting a population decline. The approach uses methods to prevent populations from going extinct.
13.5K
00:48Optimal Foraging
14.1K
How animals obtain and eat their food is called foraging behavior. Foraging can include searching for plants and hunting for prey and depends on the species and environment.
14.1K
01:46Types of Selection
45.7K
Natural selection influences the frequencies of particular alleles and phenotypes within populations in several different ways. Primarily, natural selection can be directional, stabilizing, or disruptive. Directional selection favors one extreme trait and shifts the population towards that phenotype while selecting against individuals displaying alternate traits. Stabilizing selection favors an intermediate trait with a narrow range of variation. Deviation from the optimal phenotype towards an...
45.7K
01:21Frequency-dependent Selection
24.4K
When the fitness of a trait is influenced by how common it is (i.e., its frequency) relative to different traits within a population, this is referred to as frequency-dependent selection. Frequency-dependent selection may occur between species or within a single species. This type of selection can either be positive—with more common phenotypes having higher fitness—or negative, with rarer phenotypes conferring increased fitness.
24.4K