Publications
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Amphibians
Amphibians are ecologically important in most freshwater and terrestrial habitats in the United States: they can be numerous, function as both predators and prey, and constitute great biomass. Amphibians have certain physiological (e.g., permeable skin) and ecological (e.g., complex life cycle) traits that could justify their use as bioindicators of environmental health. For example, local decline
Authors
R. Bruce Bury, P. Stephen Corn, C. Kenneth Dodd, Roy W. McDiarmid, Norman J. Scott
Nonindigenous fish
Abstract not supplied at this time
Authors
C.P. Boydstun, P.L. Fuller, J.D. Williams
Reproduction and early-age survival of manatees at Blue Spring, Upper St. Johns River, Florida
We summarize reproduction of adults and survival of calves and subadult Florida manatees (Trichechus manatus latirostris) that were identified in winter at Blue Spring on the upper St. Johns River in Florida. Some records span more than 20 years, but most are from 15-year continuous annual observations during winter 1978-79 through winter 1992-93. Fifty-seven, first-year calves were identified; 55
Authors
Thomas J. O'Shea, W.C. Hartley
Population biology of the Florida manatee: An overview
In the following overview we discuss progress toward meeting the three objectives of the 1992 workshop: to provide a synthesis of existing information about manatee population biology; to evaluate the strengths and weaknesses of current data sets and approaches to research on manatee population biology; and to provide recommendations for research. We discuss progress in six topics that were assign
Authors
Thomas J. O'Shea, B.B. Ackerman
Estimation of survival of adult Florida manatees in the Crystal River, at Blue Spring, and on the Atlantic Coast
We applied Cormack-Jolly-Seber open population models to manatee (Trichechus manatus latirostris) photo-identification databases to estimate adult survival probabilities. The computer programs JOLLY and RECAPCO were used to estimate survival of 677 individuals in three study areas: Crystal River (winters 1977-78 to 1990-91), Blue Spring (winters 1977-78 to 1990-91), and the Atlantic Coast (winters
Authors
Thomas J. O'Shea, Catherine A. Langtimm
Determination of selection gradients using multiple regression versus Structural Equation Modeling (SEM)
Selection studies involving multiple intercorrelated independent variables have employed multiple regression analysis as a means to estimate and partition natural and sexual selection's direct and indirect effects. These statistical models assume that independent variables are measured without error. Most would conclude that such is not the case in the field studies for which these methods are emp
Authors
B.H. Pugesek, A. Tomer
Species-specifc patterns of hyperostis in marine teleost fishes
Abstract not supplied at this time
Authors
W. F. Smith-Vaniz, L.S. Kaufman, J. Glowacki
Difference in the crab fauna of mangrove areas at a southwest Florida and a northeast Australia location: Implications for leaf litter processing
Existing paradigms suggest that mangrove leaf litter is processed primarily via the detrital pathway in forests in the Caribbean biogeographic realm whereas herbivorous crabs are relatively more important litter processors in the Indo-West Pacific. To test this hypothesis, we used pitfall traps to collect intertidal crabs to characterize the crab fauna in a mangrove estuary in southwest Florida. W
Authors
C.C. McIvor, T. J. Smith
Gonadal steroidogenesis in-vitro from juvenile alligators obtained from contaminated or control lakes
The ubiquitous distribution of many contaminants and the nonlethal, multigenerational effects of such contaminants on reproductive, endocrine, and immune systems have led to concerns that wildlife worldwide are affected. Although the causal agents and effects are known for some species, the underlying physiological mechanisms associated with contaminant-induced reproductive modifications are still
Authors
Louis J. Guillette, Timothy S. Gross, D. A. Gross, A. A. Rooney, H. Franklin Percival
Formation and regression of the corpus luteum of the American alligator
Luteal morphology of the American alligator is unique when compared to other reptiles but is similar to that of its phylogenetic relatives, the birds. The theca is extensively hypertrophied, but the granulosa never fills the cavity formed following the ovulation of the ovum. The formation of the corpus luteum (CL) is correlated with elevated plasma progesterone concentrations, which decline dramat
Authors
L. J. Guillette, A.R. Woodward, Q. You-Xiang, M.C. Cox, J.H. Matter, T. S. Gross
Can Dugongs Survive in Palau?
In August 1991 we surveyed dugongs Dugong dugon in the coastal waters of Palau using methods similar to aerial surveys conducted in 1977, 1978 and 1983. Twenty-six dugongs (including four calves) were seen, a count within the range obtained previously. The rate at which dugongs were seen per unit flight-time was lower than for any of the other surveys, despite the observers being more experienced
Authors
H. Marsh, G. B. Rathbun, T. J. O'Shea, A.R. Preen