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Spacecraft nadir point: 15.6° S, 62.7° W

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Spacecraft Altitude: 160 nautical miles (296km)
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Image Caption:
STS045-83-025: Marmore River, Amazonia Recent theory on the
famous issue of species diversity in Amazonia stresses river
behavior (in preference to ice-age refugia) as an explanation for
speciation in animals, fish and plant communities. Habitat des-
truction and nutrient resupply is most vigorous on river flood-
plains during floods of different return frequencies. In this
photograph an unusual series of flood-related Rsplay depositsS
(overbank sand sheets) have destroyed valley-bottom forest pro-
viding new soils for first-succession plants to colonize.