current sorted. The study of the standing crop indicated that most of the families 
identified in the total population have living representatives in the area. 
1958 - 1959 
Costello, T. J., and D. M. Allen (1959) Migration, mortality, and growth of pink shrimp. 
Fishery research for the year ending June 30, 1959. Circ. No. 62. Bureau of Commercial 
Fisheries, US Fish and Wildlife Service, Galveston, TX. 13-8. 
This citation describes migration, mortality, and growth of pink shrimp. 
1958 - 1959 . 
Costello, T. J., and D. M. Allen (1961) Notes on the migration and growth of pink shrimp, 
(Penaeus duorarum). Proc. Gulf and Carib. Fish. Inst.. 12:5-9. 
Fifteen verified recoveries of marked shrimp released in Florida Bay suggest the 
relative importance of certain areas as nursery grounds for the heavily exploited 
Tortugas pink shrimp. Previously, the only evidence linking the Florida Bay estuaries to 
the Tortugas grounds was the single tagged shrimp recovery reported in 1960. The 
useful information obtained attests to the utility of marking shrimp with biological 
stains. The method appears particularly suited to experiments which require 
observations over periods of several months. Though the data on migrations and growth 
are preliminary in nature, they will serve as the basis of more extensive 
investigations. The three mark-recovery experiments reported comprise a first step in 
delineating the areas which contribute to the maintenance of the Tortugas shrimp 
population. The marked shrimp were released off Flamingo in 1958, and off Peterson 
and Lower Matecumbe Keys in 1959. 
1958 - 1959 
Lloyd, R. M. (1964) Variations in the oxygen and carbon isotope ratios of Florida Bay 
mollusks and their environmental significance. Jour, Geol. . 72:84-111. 
The factors of climate and geography which produce salinity gradients and affect the 
molluscan fauna distribution in Florida Bay also cause variations in the 80 18 
composition of Florida Bay water. The isotopic composition of Bay water varies in 
response to (1) mixing of Atlantic and Gulf of Mexico waters having a relatively 
constant isotopic composition with Bay water along the western and southeastern 
margins; (2) evaporation of Florida Bay water which causes isotopic enrichment over 
the entire Bay; and (3) the introduction of isotopically enriched freshwater along the 
northern margin of the Bay. The net effect of these processes is to produce a persistent 
gradient of increasing 50 18 from south to north in the Bay while water outside the Bay 
is maintained at a lower and more constant isotopic composition. Isotopic ratios from 
eight species of Florida Bay mollusk shells reflect clearly the sharp contrast between 
Bay and open water 60 18 compositions and, to varying degrees, the gradient of 
increasing SO 18 in the Bay itself. Temperature alone could not cause the variations 
found. Measurement of 5C 13 in Florida Bay mollusk shells reveals a gradient of 
decreasing 8C 13 going from open-shelf water into the Bay. The gradient is attributed to 
the equilibration of C0 2 , derived locally from the oxidation of organic debris in 
sediment with carbonate ions in the water. 
1958 - 1959 
Manning, R. B. (1961) A redescription of the palaemonid shrimp, Leander paulensis 
Ortmann, based on material from Florida Bay. Bull. Mar. Sci. Gulf Carib. . 11 (4):525-36. 
A series of Leander shrimp collected in Florida Bay represent a species distinct from 
the well-known Leander tenuicornis, and the characters used to separate the species 
are listed in the citation. The specimens were collected during an ecology study of 
northern Florida Bay estuaries. 
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