Even smaller radar tags on insects

Article Abstract:

Radar tags with reduced sizes are available for tagging insects to obtain knowledge about their movement behavior and population dynamics. The small tags have no effect on the normal movement of insects. The radar tag is attached to the insect's thorax or abdomen with rubber cement, while the near-invisible dipole of radar follows the insect. The tag sends signals which are received by the transmitter receiver up to a range of 50 m. Tagged insects are relocated with the help of systematic searching and reflected signals.

Behavior, Insects, Insect populations

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Tracking fish with electronic tags

Article Abstract:

Electronic tagging is being used to study the migration of fish in the North Sea. Seasonal changes in the distribution of many fish species are caused by migration. By electronically tagging maturing female plaice in the southern North Sea, it has been possible to gather long-term migration behaviour. Results so far show that some fish can move quickly over long distances and migration rates are ten times faster than estimates deduced from conventional mark-capture methods.

Fishes, Animal migration, Fish migration, Animal marking, Animal tagging

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Tales behind the tags

Article Abstract:

A history of the scientific use of the word "relativity" is presented. The word is usually associated with Albert Einstein but also has connections with Galileo.

Words, New, New words, Relativism

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