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Gwen Noda

Fossil Evidence for Evolution of the Shape and Color of Penguin Feathers - 0 views

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    "Penguin feathers are highly modified in form and function, but there have been no fossils to inform their evolution. A giant penguin with feathers was recovered from the late Eocene (~36 million years ago) of Peru. The fossil reveals that key feathering features, including undifferentiated primary wing feathers and broad body contour feather shafts, evolved early in the penguin lineage. Analyses of fossilized color-imparting melanosomes reveal that their dimensions were similar to those of non-penguin avian taxa and that the feathering may have been predominantly gray and reddish-brown. In contrast, the dark black-brown color of extant penguin feathers is generated by large, ellipsoidal melanosomes previously unknown for birds. The nanostructure of penguin feathers was thus modified after earlier macrostructural modifications of feather shape linked to aquatic flight. "
Gwen Noda

Ice Sheets and Sea Level Rise Lesson - 0 views

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    Ice Sheets and Sea Level Rise By: Claire L. Parkinson, Oceans and Ice Branch, Code 971, NASA Goddard Space Flight Center, Greenbelt MD 20771, e-mail: clairep@neptune.gsfc.nasa.gov Exercise: Determine the amount that sea level would rise, averaged around the globe, in response to the complete melting of (a) the Greenland ice sheet, (b) the Antarctic ice sheet, and (c) both the Greenland and Antarctic ice sheets.
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