780 F. General OLR (1985) 32 (9)

intrusions associated with back-arc volcanism activ- ity apparently 'cooked blankets of organic sedi- ments.' Although the thermal origin of the deposits makes it unlikely that large petroleum accumulations are present, it does suggest that other types of hydrothermai processes may be occurring in the basin. In addition, the deepest plumes of hydro- carbons ever found are reported rising from oil seeps associated with faults on the 2-km-deep seafloor of Guaymas Basin (Gulf of California), where the high temperatures associated with the spreading center apparently contributed to rapid maturation of the hydrocarbons. (hbf)

85:5353 Weisburd, S., 1985. Deep source of magnetic stripes.

Sci. News, Washington, D.C., 127(13):p.198.

Results of the first direct measurements of rocks lying below 600 meters of seafloor (DSDP Leg 83) show that deeper parts of the Earth's crust can be a source of the magnetic anomalies that show up as zebralike stripes in magnetometer recordings. While it was known from ophiolites that the magnetization of the crust is not uniform, the new core samples, which include the top 300 meters of the sheeted dyke complex (the first samples of this major portion of the marine crust), provide direct evidence of the exact nature of the magnetic properties of the rock at the deeper levels. The evidence supports the theory that the crust can display a magnetic field even though the upper layers may have been altered. (wbg)

85:5354 Weisburd, S., 1985. Climate conspires against oxygen

and oysters. Sci. News, Washington, D.C., 127(14):p.214.

One factor responsible for the depletion of Ches- apeake Bay oysters over the past 30 years is anoxia caused by increased runoff and sewage effluent. In a recent paper, Johns Hopkins researchers have identified climate as a possible contributor to the problem. It is the first to link climate with anoxia and the Chesapeake's biology and to suggest the possibility of predicting climate's effects on com- plicated ecosystems months in advance. Here the evidence is presented along with the reasons why some scientists believe the link between climate and anoxia in the bay is not proved. (wbg)

85:5355 Zimmerman, J.F.T., 1985. Radar images of tile sea

bed. Report. Nature, Lond~ 314(6008):224-226.

The observed correlation of radar backscattering from capillary waves with bottom topographic

features is discussed. It is argued that this coupling occurs through the modulation of the surface waves by tidal currents which are strongly steered by bottom topography. This modulation results from several mechanisms, including current-wave hydro- dynamic interactions and the modification of the wind-wave saturation spectrum. A critical review of the theoretical analysis of this connection by Alpers and Hennings (in this same issue of Nature) is presented. Netherlands Inst. for Sea Res., P.O. Box 59, 1790 AB Den Burg, Texel, Netherlands. (wbo)

F390. Educational literature

85:5356 Anonymous, 1985. Gallery. Shrimp you won't find in

your cocktail. A resplendent array of exotic crustaceans. Discover, 6(3):55-61.

85:5357 Anonymous, 1985. The blue revolution. Mariculture.

Economist, 294(7386):p.90.

Dr. Walter Adey of the Smithsonian Institution discovered how reefs support life despite nutrient scarcity--waves and currents renew the supply of nutrients and blue-green algae provide the necessary soluble nitrogen (capturing gaseous N and then converting it to soluble N). These discoveries have led to a 'cheap and simple' way to raise king crabs on artificial reefs in the Caribbean. These methods may soon be applied to other marine species such as the Pacific abalone. (ahm)

85:5358 Bachand, R.G., 1985. Vision in marine animals. Sea

Front, 31(2):68-74.

85:5359 Chandler-Middleton, Karen, 1985. In search of spiny

lobster larvae. Sea Front., 31(2):86-93.

85:5360 Johnson, Diane, 1985. Silver satellites. Weather

satellites. A special report. TechnoL Rev., 88(3): 22-27.

The general usefulness of the U.S. NOAA-managed network of polar-orbiting and geostationary satel- lites (currently threatened by federal cost-cutting measures) is discussed. While the role of satellites in weather forecasting is perhaps their best known function (though it may not be known the infor- mation so gathered is free to all), they serve many other purposes: routing airliners; spotting fires, oil spills, and sea-borne ice; flood prediction; crop