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One possible cause for river channel migrations is sediment-flux steering, i.e. the shift of rivers in sedimentary basins against a tectonically driven trend caused by transverse sediment discharge.
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Driven trends caused by natural selection will continue only so long as the selective pressure exists.
In technical terms, driven trends are those in which the underlying dynamic is homogeneous, whereas passive trends result from dynamics that are at least locally heterogeneous.
As McShea (1994) noted, driven trends permit extrapolations from small-scale to large-scale and vice versa, whereas passive trends do not.
This figure shows the results of computer simulations designed to illustrate passive versus driven trends as distinguished by the behavior of the minimum values in the distribution.
If the minimum does not change, then this is suggestive of a passive trend, although it must be noted that some locally driven trends do not involve increases in the minimum (e.g., Alroy 1998).
Comparisons of ancestors with their descendants can be used to distinguish passive versus driven trends (in this hypothetical example, of changes in average complexity), so long as an appropriate starting point is selected.
Driven trends, by contrast, are analogous to particles moving together in one direction under the action of a shared force field, such as iron filings being drawn by a magnet.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com