between eastern and western portions of Florida Bay. Samples were collected in 1967 
and 1968. 
1967 - 1969 
Green, M. A. (1975) Survey of endolithic organisms from the Northeast Bering Sea, 
Jamaica, and Florida Bay. M. S. Thesis, Duke University. 
[NO COPY OF PAPER AVAILABLE. ABSTRACT FROM SCHMIDT (1991).] A comparative 
analysis of endolithic organisms within carbonate substrates from polar and tropical 
regions was undertaken to determine to what extent these microboring assemblages 
differ and what microboring organisms are present in each regime. Substrates were 
retrieved from Jamaica and from sites in Swash Keys Basin and Long Sound, Florida 
Bay. Assemblages observed in Florida Bay samples were composed primarily of blue- 
green algae (Mastigocoleus testarum, Plectonema sp., Hyella caespitosa) and green 
algae ( Ostreobium brantium). Little distinction could be made between endolithic 
assemblages from Jamaica and Florida Bay. 
1967 - 1968 
Heald, E. J. (1969) The production of organic detritus in a south Florida estuary. Ph. D. 
Dissertation. University of Miami, Coral Gables, FL. 110 pp. 
[NO COPY OF PAPER AVAILABLE. ABSTRACT FROM SCHMIDT (1991).] [Also publ. as: 
Sea Grant Tech. Bull. No. 6, Univ. of Miami Sea Grant Prog., Miami, FI. 1-110 p. 
(1971).] During 1967 and 1968 in the North River, the annual production of organic 
debris by red mangrove, Juncus, and sawgrass was studied. The rate of decomposition 
and the manner of degradation were determined, as well as the total contribution by 
each producer to the detrital load of the river. It was found that annual production 
exceeded 3 metric tons acre' 1 , of this, 90% was produced by red mangrove. 
Degradation of red mangrove leaves was most rapid in brackish water as opposed to 
freshwater and the terrestrial environs. Two species of amphipods and a xanthid crab 
were consumers in brackish water. Seasonally the quantity of detritus was highest in 
the river from November - February; mangrove detritus accounted for 35-60% of the 
total suspended material month* 1 . The nutritive value of mangrove detritus, its 
significance as an energy source in the estuarine ecosystem, and the importance of the 
mangrove community to adjoining bays are considered. 
1968 0 
Hughes, D. A. (1968) Factors controlling emergence of pink shrimp ( Penaeus duorarum) 
from the substrate. Biol. Bull. . 134:48-59. 
[DATE OF SAMPLING UNKNOWN OR NOT APPLICABLE.] A close relationship exists 
between the day-night cycle and the times of activity of pink shrimp. The shrimp bury 
beneath the substrate during the day but emerge at the time of sunset and are active at 
night. Emergence from the substrate is markedly synchronized in all members of the 
population. This study elucidates the mechanisms whereby this synchrony is 
maintained. The persistence of the pattern of nocturnal activity for several days under 
conditions of constant low light intensity confirmed that emergence and subsequent 
activity were under rhythmic control. Resynchronization of the phase of the rhythm 
controlling emergence to a shift in the light-dark cycle indicated that the light-dark 
cycle itself, or some component of it, is responsible for maintaining the relationship 
between emergence and the day-night regime. The close association between emergence 
and the time of light-dark transition indicated the possibility that the latter was the 
important component of the Zeitgeber responsible for the control of the time of 
emergence. This was supported by experiments in which a changing responsiveness was 
shown to light-dark transitions imposed at various times during the light period. 
Maximum response (in terms of the rate and degree of emergence from the substrate) 
190 
