1949 - 1951 
Moore, J. C. (1953) The crocodile in the Everglades National Park. Copeia. 1953(1 ):54-9. 
This citation is a review of the status of the American crocodile and is based on 
observations by the authors from 1949 to 1951, and on intermittent observations from 
other sources from 1900 to 1951. 
1949 - 1955 
Moore, J. C. (1956) Observations of manatees in aggregations. Amer. Muse. Nov. . 
1811:1-24. 
The difficulties of observing wild manatees under ordinary circumstances were found 
to be substantial and were considered to explain the absence of any previous report of 
systematized field observations. Natural cold-induced aggregations of wild manatees 
were found to provide favorable circumstances for field observations. Identification of 
individuals by means of scars permitted recognition of some of them five and a quarter 
years after first identification. The study took place from 1949 to 1955. During the 
last winter season of observations, 1954 - 1955, in 10 aggregations, 57 marked 
individuals were recognized and 195 individuals were estimated to have been present. 
Some of these evidently reside in the vicinity at least during the winter season. And of 
these some appear to move in for the winter season, possibly taking part in a seasonal 
migration. Presence or absence of barnacles and algae on the skin indicates that some 
individuals reside in freshwater up river, others in the saline waters of the Bay. 
Pattern of attendance of aggregations by marked individuals suggests that their ranges 
were dispersed and reveals no evidence of social organization. Mothers with young 
were not accompanied by other individuals. Groups within the aggregations engaged in 
play. The muzzle-to-muzzle contact between individuals involves lifting snouts above 
the surface, perhaps as relict behavior inherited from territorial ancestors. The 
usually observed courtship behavior was of a male approaching, nuzzling, "embracing", 
and presenting its venter to some presumed female, which most frequently turned 
away or swam off before courtship proceeded further. Of the identifiable sample of 65 
individuals about 15% were recorded as inmatures and 15% as calves, each closely 
accompanying an adult. The relative sizes of calves and other evidence suggests lack of 
any distinct breeding season. Annual reproduction by adult females is questioned. Young 
sometimes rode on mother's back. Suckling took place in horizontal position, under 
water, without embrace. Very young calves swam only with flippers. Adults ordinarily 
swam only with tail, but only one adult regularly used its flippers also. 
1952 - 1954 
Ginsburg, R. N. (1956) Environmental relationships of grain size and constituent particles in 
some south Florida carbonate sediments. Am. Assoc. Petrol. Geol. Bull, . 40(10):2384-427. 
In the southern extension of the Florida peninsula variations in the ! submarine 
topography, areal geography, and hydrography which control the distribution of 
sediment-producing organisms are reflected in the grain size and constituent particle of 
the calcareous sediments being deposited. Two major environments can be recognized: 
(1) a curving band-shaped reef tract with good water circulation, and (2) Florida Bay, 
a very shallow triangular area with semi-restricted water circulation. Florida Bay 
sediments have larger proportions of particles less than 1/8 mm than the sediments of 
the reef tract. The constituent particle composition of the fraction larger than 1/8 mm 
in Florida Bay is almost exclusively molluscan and foraminiferal, but in the same size 
fraction of the reef tract sediments fragments of algae and corals are abundant. Similar 
distinctions in grain size and constituent particles for comparable environments can be 
derived from published data for the sediments around Andros Island Bahamas. In Florida 
Bay large local variations in physical environment obscure the expected effects of 
differences in environment from one part of the Bay to another, and no distinct sub- 
131 
