OLR (1983)30 (6) 479

biology. Dept. of Zool., Univ. of Georgia, Athens, Ga. 30602, USA. (mjj)

83:3549 Mauersberger, Peter, 1982. Logistic growth laws for

phyto- and zooplankton. Ecol. Model., 17(2):57- 63.

Logistic growth equations are derived from a thermodynamic theory of aquatic ecosystems. The equations include the effects of temperature, light and excretion. Inst. of Geography and Geoecology, Acad. of Sci. of the G.D.R., Berlin, DRG. (msg)

83:3550 Stebbins, G.L., 1982. Perspectives in evolutionary

theory. Evolution, 36(6): 1109-1118.

The synthetic theory of evolution as developed 3 or 4 decades ago need not be cast aside. It is however the case that the vast time scale differences in pale- ontological and genetic observations result in very different meanings applied to such words as 'sudden' or 'gradual,' 'continuous' or 'punctuated.' The conclusion here is that microevolutionary processes are conceived best as gradual; but over geological time scales, differential survival of species presents a picture best described as punctuated equilibrium. Dept. of Genetics, Univ. of California, Davis, Calif. 95616, USA. (fcs)

83:3551 Thiery, R.G., 1982. Environmental instability and

community diversity. Biol. Rev~ 57(4):691-710.

The relationship between environmental stability and community diversity is reviewed; both evolu- tionary and ecological mechanisms are considered. Environmental stability/instability is seen as a troublesome concept with no clear rules and insuf- ficient data for evaluation of hypotheses. Integration of ecological effects with both evolutionary mech- anisms and spatial instability (heterogeneity) is essential to further understanding. Aquatic Res.

Group, Coachella Valley Water Dist., Coachella, Calif. 92236, USA. (mjj)

FAO0. Books, collections (general) 83:3552

Straskraba, Milan (ed.), 1980/82. Simulation of systems in biology and medicine. Symposium, Sisy, Praha, Czechoslovakia, 18-20 November 1980. Special issue. Ecol. Model., 17(2):53-180; 12 papers.

Twelve of the 21 papers presented in 1 symposium section are included. These papers reflect the modern trend of returning to simple models based on basic principles. Particular approaches include stochastic theory, nonlinear irreversible thermody- namics, generalized Gibbs relation for entropy change, cybernetic control theoretic methods, multi- objective optimization, correlation analysis, and an extension of the Lotka-Volterra equations. Several papers attempt to derive 'ecological relations from first principles' and from physical, chemical and biological constraints. Systems dealt with include the Black Sea, lakes, reservoirs, aerobic biological wastewater treatment plants, sediments, and phyto- and zooplankton growth. (mjj)

FAIO. Miscellaneous

83:3553 Condrey, R.E., 1982. Ingestion-limited growth of

aquatic animals: the case for Blackman kinetics. Can. J. Fish. aquat. Sci., 39(12):1585-1595.

Published data on ingestion-limited growth are consistent with Blackman kinetics. If ingestion limits growth rate there is a linear relationship between growth and ingestion from starvation to satiation; if growth is limited by some other factor, there is no increase in growth rate with increasing ingestion rate. Center for Wetland Res., Louisiana State Univ., Baton Rouge, La. 70803, USA.

F. GENERAL

FIO. Apparatus, methods, mathematics (multidisciplinary)

83:3554 Carson, R.M., 1982. On the capsize performance of a

discus buoy in deep sea breakers. Ocean Engng,

9(5):501-514. Dept. of Mech. Engrg., Univ. of Nairobi, P.O. Box 30197, Nairobi, Kenya.

83:3555 Rogers, A.E.E. et al., 1983. Very-long-baseline radio

interferometry: the Mark III system for geodesy,