A fascinating new study from the forthcoming issue of The American Naturalist attempts to explain the mysterious persistence of two forms of females in many diving beetle populations. Their findings have important implications for theories of sexual conflict, which arises when the costs and benefits of multiple matings differ for males and females.
"The male versus female arms race (involving physical structures, behaviors, chemicals, etc.) for control over mating may take place over evolutionary time, which in theory can lead to the formation of a new species," explain the authors.
Examining species of diving beetles that have two forms of females – for example, one with a smooth back and another furrowed – the researchers found that this polymorphism is actually a stable state, that is, neither of the forms go extinct.
Suzanne Wu | EurekAlert!
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At the ILA Berlin, hall 4, booth 202, Fraunhofer FHR will present two radar sensors for navigation support of drones. The sensors are valuable components in the implementation of autonomous flying drones: they function as obstacle detectors to prevent collisions. Radar sensors also operate reliably in restricted visibility, e.g. in foggy or dusty conditions. Due to their ability to measure distances with high precision, the radar sensors can also be used as altimeters when other sources of information such as barometers or GPS are not available or cannot operate optimally.
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