Modelling migration: the clock-and-compass model can explain the distribution of ringing recoveries

Article Abstract:

Research was conducted to examine the directional distributions found in ringing recoveries of night-migrating passerines. A mathematical model was proposed that projects directional distributions to be a function of distance by a clock-and-compass method. A comparison of data from the natural migration of pied flycatchers, Ficedula hypoleuca, and the predictions was performed. Results reveal a strong correlation between the distribution of ringing recoveries and the model's predictions and suggest that the passerines use a clock-and-compass strategy during migration.

Behavior, Passeriformes, Perching birds, Birds, Bird migration

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Friction melt distribution in a multi-ring impact basin

Article Abstract:

Study of the distribution of the pseudotachylyte friction melt in the floor of the Sudbury impact basin in Canada provides information on the formation of multi-ring basins. The multi-ring basins are formed by a very large impact of celestial objects. The friction melt defining the rings around the central impact sheet is found in four concentric circles of increasing diameter, thus indicating that the multi-rings are formed by a process of collision followed by faulting.

Canada, Basins (Geology)

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Under the ringed basins

Article Abstract:

Spray and Thompson have investigated the Sudbury impact crater in Canada to understand the formation of impact craters. The 1.85-billion-year-old Sudbury crater is a mountain ring type crater. The investigation reveals the process of deep-seated faulting, which occurs due to the impact of a celestial object and helps understand the formation of such mountain ring craters.

Research, Lunar craters

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