African-European honeybee hybrids have low nonintermediate metabolic capacities

Article Abstract:

Potential differences between the metabolic capacities of African, European and hybrid honeybees were studied by comparing carbon dioxide production during agitated flight. Physiological findings revealed that African bees had higher mass-specific metabolic capabilities comapared with European bees. In African-European hybrids, this was found to be low and nonintermediate. These suggest that African bees derive their competitive advantage in tropical environments to their possession of higher metabolic and flight capacities. In addition, Results also indicate that depressed hybrid fitness in neotropical feral colonies is mediated by negative heterosis for metabolic rates.

Measurement, Physiological aspects, Metabolism, Adaptation (Biology), Evolutionary adaptation, Africanized honeybee

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Gravitational scattering as a possible origin for giant planets at small stellar distances

Article Abstract:

A novel model of planetary migration was established to provide explanation for the large orbital eccentricities which have recently been observed among planets. The model demonstrated that the orbits in a system of three or more giant planets may become unstable as they gain mass through the accumulation of gas from the circumstellar disk. The subsequent gravitational encounters among the planets can then eject one from the system as others are placed into highly eccentric orbits both closer and farther from the star.

Analysis, Origin, Planet formation, Mechanics, Celestial, Celestial mechanics

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Honeybee dances communicate distances measured by optic flow

Article Abstract:

Research examining communication systems in honeybees is presented, with particular focus on optic flow distance measurements communicated in honeybee dances. It is concluded that dances in honeybees are used to communicate food sources.

Telecommunications systems

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