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Summary: that Nesomimus appears to belong within the
ancestral genus. Their analysis also illuminates
the finer-grained relationships amongst the Gala-
pagos mockingbirds, revealing the wind-aided
routes by which they diversified and how their
history compares to that of the finches. -- AMS
Evolution 60, 370 (2006).
G E O P H Y S I C S
Not the Fault of Compaction
Deltas represent a huge accumulation of sedi-
ment; large ones are often the sites of major
cities, such as New Orleans. Several processes--
compaction of the sediment, withdrawal of
ground water and oil (which accelerates com-
paction), and sea level rise--lead to subsidence
and inundation of the deltas and to associated
problems for their cities. These are compounded
when the supply of new sediment is interrupted,
as is commonly the case.
On the other hand, subsidence can also be
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