effect diagenesis. Porosity of island cores is just slightly less than the porosity of 
offshore cores. Permeability increases, on Cluett Key, from the east side to the west 
side. Salinity values increase from west to east. Likewise, concentrations of 
magnesium and calcium in subsurface water increase from the west side to the east. 
The formation of dolomite on Cluett Key is apparently related to some island controlled 
processes. These exact processes have yet to be discovered. Whether dolomite is still 
being formed today or was formed some time in the past and has now stopped is not 
known. Sampling took place during 1976. 
1976 0 
Woelkeriing, W. J. (1976) South Florida benthic marine algae. Sedimenta V. Comparative 
Sedimentology Laboratory, University of Miami, Coral Gables, FL. 
[NO COPY OF PAPER AVAILABLE. ABSTRACT FROM SCHMIDT (1991).] This paper 
provides illustrated keys to the genera of green, brown, and red algae and to the genera 
and species of blue-green algae commonly found in marine benthic communities of 
Florida with emphasis on those forms found in the Florida Bay portion. A glossary of 
morphological terms used in the keys, the literature pertaining to Florida marine algae, 
brief comments on marine algae habitats and communities and instructions for the 
collection, preservation, and examination of algae material were included. 
1976 0 
Zieman, J. C. (1976) The ecological effects of physical damage from motorboats. Aquatic 
Bot. . 2:127-39. 
[DATE OF SAMPLING UNKNOWN OR NOT APPLICABLE.] Observation has shown that beds 
of turtle grass, Thalassia testudinum, although highly productive, do not recover 
rapidly following physical disturbance of the rhizome system. In shallow waters the 
most common form of rhizome disturbance is from the propellers of motor boats. In 
turtle grass beds which are otherwise thriving, tracks resulting from propellers have 
been observed to persist from 2 to 5 years. The proportion of fine sediment 
components is reduced in the sediments from the boat tracks, and the pH and Eh are 
reduced in comparison to the surrounding grass bed. Damage of this type is most likely 
to occur in the shallow passes between islands and keys. These areas are also the 
slowest to recover due to the rapid tidal currents present in the shallow passes. 
1976 - 1977, 1979 - 1981 
Walker, N. D. (1982) Physical responses of southern Florida and northern Bahama lagoon 
waters to severe cold air outbreaks and effects on hermatypic coral reefs. M. S. Thesis. 
Louisiana State University, Baton Rouge, LA. 114 pp. 
[NO COPY OF PAPER AVAILABLE. ABSTRACT FROM SCHMIDT (1991).] Major 
mortalities of southern Florida and northern Bahama reef corals during recent winters 
suggest that chilled water masses may influence their development. This research was 
undertaken to investigate the regional extent, duration, and frequency of water mass 
chilling and preferential routes for offshore water movement. Temperature infrared 
satellite data (NOAA-5 and NOAA-6), in situ water temperatures from eastern Florida 
Bay, local meteorological data, and a numerical heat flux model were incorporated in 
the analyses. Study results indicated that southern Florida and northern Bahama lagoons 
provide less than optimal environmental conditions during winter for reef growth and 
development. Shallow bays of southern Florida chill below the 16°C thermal stress 
threshold for reef corals several times each winter. The longest observed residence 
time for sub-16°C water in Florida Bay was 12 days during January 1981. The present 
distribution of reef corals can be attributed to cold air outbreak chilling of shallow 
lagoon waters and their offshelf transport routes. 
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