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stored in sediments over the winter. Ecosystems Center, MBL, Woods Hole, MA 02543, USA. (gsb)

86:1642 Salzwedel, Horst, Eike gachor and Dieter Gerdes,

1985. Benthic macrofanna commuities in the German Bight. VerOff. Inst. Meeresforsch. Bremerh., 20(2): 199-267. Procopa-IMARPE, Apt 22, Callao, Peru.

86:1643 Thistle, D., J.Y. Yingst and K. Fauchald, 1985. A

deep-sea benthic community exposed to strong near-bottom currents on the Scotian Rise (west- ern Atlantic). Mar. Geol., 66(1-4):91-112.

At 4626 m depth, abundances of polychaetes, bivalves, isopods and tanaids are conspicuously high compared to those reported from comparable depths; bacterial numbers and ATP concentrations are also high. These anomalous abundances may result from enhanced food availability caused by the strong near-bottom currents that flow through the area. The polychaete and bivalve faunas have few adults and high species dominance suggesting that currents create large-scale, sediment-transporting disturbances. Dept. of Oceanogr., Florida State Univ., Tallahassee, FL 32306, USA.

86:1644 Tsuchiya, M. and M. Nishihira, 1985. Islands of

Myt//as as a habitat for small intertidal animals: effect of Island size on community structure. Mar. Ecol.-Prog. Set., 25(1):71-81.

With increasing patch size, species richness and number of individuals of associated animals in- creased; patch area affected population density more than patch volume. Volume of associated animals per unit patch area was relatively constant, but volume per unit patch volume decreased with increasing patch size. At high tides, large numbers of the amphipod Hyale grandicornis, which live among algae attached to the patches, were seen on rock surfaces covered by the barnacle Chthamalus challen- geri around the patches. These results can be explained mainly in relation to accumulation of sediments and shell fragments of M. edulis in the patches. Dept. of Biol., Univ. of the Ryukyus, Nishihara, Okinawa 903-01, Japan.

El20. Estuarine, marsh and mangrove communities

86:1645 Blum, Michael and J.R. Jones, 1985. Variation in

vegetation density and foredune complexity at

North Padre Island, Texas. Tex. J. Sci., 37(1): 63-73. Dept. of Geography, The Univ. of Texas at Austin, Austin, TX 78712, USA.

86:1646 de Kroon, Hans, Hans de Jong and J.T.A. Ver-

hoeven, 1985. The macrofauna distribution in brackish inland waters in relation to chlorinity and other factors. Hydrobiologia, 127(3):265-275.

The macrofauna of small isolated brackish water bodies on a barrier island in the Dutch Wadden Sea were sampled qualitatively. The observed differences in the macrofauna cannot be explained by differ- ences in chlorinity only; present and former con- nections to other water bodies seem equally impor- tant. Dept. of Plant Ecol., Univ. of Utrecht, Lange Nieuwstraat 106, 3512 PN Utrecht, The Nether- lands,

86:1647 Jim~nez, J.A., A.E. Lugo and Gilberto Cintr6n,

1985. Tree mortality in mangrove forests. Bio- tropica, 17(3): 177-185. Escuela de Ciencias Biol., Univ. Nac., Heredia, Costa Rica.

86:1648 L6pez-Portillo, Jorge and Exequiel Ezcurra, 1985.

Litter fall of Avicennia germinans L. in a one-year cycle in a mudflat at the Laguna de MecoacKm, Tabasco, Mexico. Biotropica, 17(3): 186-190. Inst. de Ecol., Postal 18-845, Delega- cion Miguel Hidalgo, 11800 Mexico, D.F., Mexico.

El50. Microbiology (communities, pro- cesses; also bacteria, fungi, yeasts, viruses, etc.)

86:1649 Bowditch, R.D. and Paul Baumann, 1985. Effect of

Na + and K + on the growth of marine species Vlbrio pel~ns and Alteromonns ;mloplankt~ in chemostat cultmes. Curt. Microbiol., 12(2):65-68. Baumann: Dept. of Bacteriology, Univ. of California, Davis, CA 95616, USA.

~:1(~:~0 Brock, T.D., 1985. Life at high temperatures. Science,

230(4722): 132-138.

This overview of thermophily includes a discussion of the types of organisms adapted to high temper- atures, the molecular and genetic basis for this adaptation, evolutionary trends, and potential bio- technological applications. Only bacteria are found