10. BARILOTTI, D.C., and BACKMAN, T.W. , "Irradiance Reduction: Effects on 

 Standing Crops of the Eelgrass, Zosteva mavina, in a Coastal Lagoon," 

 Marine Biology, Vol. 34, No. 1, Jan. 1976, pp. 33-40. 



Abundance of the eelgrass {Zosteva marina) in a coastal lagoon in southern 

 California was found to correlate with the level of irradiance at depths 

 greater than 0.5 meter below tidal datum. Field experiments during a 9-month 

 study, using canopies to reduce illuminance by 63 percent, confirmed that 

 turion density is a function of the irradiance the plants receive. By day 18 

 of the experiment, turion density in the shaded experimental areas had 

 decreased. Turion densities were continually lower throughout the study 

 period in the experimental areas. Flowering was also inhibited by shading. 

 The biological implications are discussed with respect to seasonal changes in 

 incident solar radiation, water transparency, and changes in water quality. 



11. BAYLEY, S., et al., "Changes in Submerged Aquatic Macrophyte Populations 

 at the Head of Chesapeake Bay, 1958-1975," Estuaries, Vol. 1, No. 3, Sept. 

 1978, pp. 171-182. 



Submerged aquatic plant populations in the Susquehanna Flats of the 

 Chesapeake Bay were monitored for 18 years. An exotic species, Eurasian water 

 milfoil (Myriophyllum spiaatum) , increased dramatically from 1958 to 1962; 

 dominant native species declined. After 1962, milfoil populations declined 

 and the native rooted aquatics began to return to their former levels. In the 

 late 1960's all species declined and by 1972 almost disappeared from the 

 Susquehanna Flats. These fluctuations may have been related to several fac- 

 tors in the Chesapeake Bay, including tropical storms, turbidity, salinity, 

 and disease. The use of the flats by waterfowl is related to the abundance 

 and species composition of the submerged macrophytes. 



12. BIEBL, R. , and McROY, C.P. , "Plasmatic Resistance and Rate of Respiration 

 and Photosynthesis of Zostera marina at Different Salinities and Tempera- 

 tures," Marine Biology, Vol. 8, No. 1, Jan. 1971, pp. 48-56. 



Zostera marina (eelgrass) was studied at the Izembek Lagoon, Alaska 

 Peninsula. Two morphologically different forms, tidepool and subtidal, were 

 distinguished. Both showed a high tolerance to different salinities and tem- 

 peratures. The plasmatic resistance was found in a range of distilled water 

 up to 3.0 seawater (24 hours) and between -6° and 34" Celsius (12 hours). 

 Within these resistance limits, photosynthesis, which has its maximum in 1.0 

 (normal) seawater, decreased nearly to zero in distilled water and in 2.0 

 seawater, and increased with the temperature in the tidepool form up to 35° 

 Celsius, but in the subtidal form up to 30° Celsius only. At higher tempera- 

 tures photosynthesis declined sharply in both forms. Respiration was minimum 

 in distilled water at 0° Celsius, and increased with increasing salinity and 

 temperature. 



13. BOONE, CO., and HOEPPEL, R.E., "Feasibility of Transplantation, Revege- 

 tation, and Restoration of Eeelgrass in San Diego Bay, California," Report 

 No. WES-MP-Y-76-2, U.S. Army Engineer Waterways Experiment Station, 

 Vicksburg, Miss., Feb. 1976. 



Several methods of eelgrass {Zostera marina) transplantation, restoration, 

 and revegetation in San Diego Bay, California, are evaluated. A literature 



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