to be equally utilized in both clastic and carbonate sediments. This result differs from 
the preferential utilization of certain amino acids generally found in deep-sea 
sediments. The results of laboratory adsorption experiments suggest that in clay 
sediments, free amino acids are predominantly adsorbed by the organic matter in the 
sediment rather than by the clay minerals. However, in the carbonate sediments, the 
organic matter seems to inhibit the adsorption of free amino acids on the carbonate 
grains. 
1979 
Schmidt, T. W. (1979) Preliminary observations on fish predator-prey interactions in the 
Shark River estuary, Everglades National Park. Second Conf. on Natl. Parks, San Francisco, 
CA. November, 1979. 63. 
[ABSTRACT ONLY.] In this paper, preliminary results are reported on a fish food habits 
study currently in progress in the Shark River estuary, Everglades National Park. The 
purposes of the study were to obtain quantitative information on the energy pathways 
and trophic interrelationships of dominant, non-game, epibenthic fish, shrimp, and 
crabs. It is part of a larger project to identify the driving variables on the biotic 
resources within the coastal ecosystems of South Florida National Park Service areas. 
These data are essential in our understanding of how these estuaries respond to 
external parameters, fishing pressure, and natural or man-made environmental 
variation. The selection of study sites and standard sampling techniques focused on the 
principal prey items of pinfish Lagodon rhomboides, silver jenny Eucinostomus gula, 
silver perch Bairdiella chrysura, lane snapper Lutjanus synagris, pigfish Orthopristis 
chrysoptera, blue crab Callinectes sapidus, and pink shrimp Penaeus duorarum. Types 
of sampling gear employed, the design, fabrication, and installation of mechanical hard¬ 
ware required to accommodate the samplers, and the procedures used, including water 
quality parameters measured, sampling frequency and intervals, are discussed. A 
literature search on potential predator-prey organisms was conducted through park and 
university libraries. A rapid, standardized approach for laboratory procedures was 
developed utilizing the same methods to measure the food organisms and those taken in 
concurrent biotic surveys. Required information on the individual- predators included 
numbers, length, weight, sex, reproductive condition, and species of food organisms 
being eaten. A data manipulation and processing system was developed on a Wang 2200 
minicomputer to store and retrieve stomach contents data sets and to compute and 
display the statistical summaries of the prey organisms including numerical and percent 
composition (frequency of occurrence), abundance and biomass of the food items. In 
addition, the storage of important life history information on other predator character¬ 
istics was facilitated. Prey organism collected between March and June, 1979, 
indicated that most of the diet items fell into three categories: mussels Brachidontes 
exustus : polychate fragments; and gammarid or caprellid amphipods. Future work plans 
are to determine if feeding preferences are due to differences in prey availability 
resulting from natural or man-made environmental variation. With this information in 
hand the park managers who are responsible for managing natural resources can direct 
their interests towards understanding what regulates the stability of these 
ecosystems. 
1979 0 
Tisserand Delclos, L. (1979) Foraminiferes de deux localites de la baie de Floride et des 
environs; Joe Kemp Key et Key Biscayne. (Foraminifera from two localities in Florida and 
vicinity; Joe Kemp Key and Key Biscayne) Notes du Laboratoire de Paleontoloqie . 4(2): 19- 
25. 
[DATE OF SAMPLING UNKNOWN OR NOT APPLICABLE. CITATION IN FRENCH.] This 
citation discusses foraminifera from Joe Kemp Key and Key Biscayne. 
250 
