of over 5 x 10 11 g S (S0 2 ) yr' 1 , but because the highest H 2 S emissions are measured 
from specific plant communities (mangroves and tidal marshes), the natural input to the 
atmosphere may be important on a smaller scale. Measurements at Flamingo took place 
in 1984 and 1985. 
1984 - 1985 
Dewey, M. R., L. J. Mengel, N. A. Funicelli, H. E. Bryant, G. M. Ludwig, and D. A. Meineke 
(1989) Trammel net efficiency in the coastal waters of Everglades National Park. Symp. on 
Florida Bay: A Subtropical Lagoon. Miami, FL. June, 1987. Bull. Mar. Sci. . 44(1):516-7. 
Quantitative trammel net sampling was conducted in the Florida Bay from 1984 to 1985 
to obtain estuarine fish standing stock estimates. Efficiency tests were conducted to 
obtain more accurate estimates of standing stock from the net samples. Trammel net 
sampling efficiencies were calculated from spotted seatrout (Cynosion nebulosus), gray 
snapper (Lutjanus griseus), pinfish (Lagodon rhomboides), catfish, which included sea 
catfish (Arius felis) and gafftopsail catfish (Bagre marinus) and mullet, which included 
white mullet (Mugil curema) and striped mullet ( Mugil cephasus). Nine efficiency tests 
were conducted with mean efficiencies ranging from 29% for pinfish to 70% for 
catfish. Variability among replicates in set efficiency was high for each taxonomic 
group. No significant correlations were noted between high number of fish collected in 
the trammel net and efficiency of the set. With the methodology used in this study, an 
extensive number of tests would have to have been conducted to obtain minimally 
acceptable levels of accuracy and precision. Sampling efficiency of any one set appears 
to be influenced by a variety of often unmeasurable and unrecorded variables including 
method of deployment, strike efficiency, the differential behavior of species reacting 
to net deployment and strike, and variable habitat conditions sampled. 
1984 - 1985 
Ehrhardt, N. M. (1990) Mortality and catchability estimates for the stone crab ( Menippe 
mercenaria) in Everglades National Park. Bull. Mar. Sci. . 46(2):324-34. 
Estimates of natural mortality have not been reported for the stone crab Menippe 
mercenaria, yet this information is essential for describing the population dynamics of 
the species and to manage the stocks. In this study, mortality of adult males inhabiting 
an area off Cape Sable was estimated by sequential tagging experiments and by analysis 
of fishery statistics for the period October 1984 to May 1985. Natural mortality rates 
range from 0.780 to 6.867 per annum. Differences in the mortality estimates are 
attributed to dominance of specific size groups included in the tagging experiments, 
with mortality rates varying linearly with size of tagged individuals. The higher natural 
mortality rates corresponded to individuals with carapace widths at or above the 
average size at terminal molt. The mortality estimates were obtained from information 
gathered under exceptional circumstances and complexities of estimating these rates 
due to difficulties of aging crustaceans are recognized. This problem is further 
complicated in the stone crab fishery because only claws are harvested and landed, 
therefore, the true age composition of the stocks may never be known from standard 
commercial statistics. 
1984 - 1985 
Funicelli, N. A., D. A. Meineke, H. E. Bryant, M. R. Dewey, G. M. Ludwig, and L. S. Mengel 
(1989) Movements of striped mullet, Mugil cephalus, tagged in Everglades National Park, 
Florida. Symp. on Florida Bay: A Subtropical Lagoon. Miami, FL. June, 1987. Bull, Mar, 
SfiL, 44(1): 171 -8. 
The movements of striped mullet, Mugil cephalus, were studied from fish tagged in 
Everglades National Park. A total of 16,604 fish were tagged from March 1984 to 
September 1985. During the period of December 1984 through February 1985, 
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