Publications
These publications showcase the significant science conducted in our Science Centers.
Filter Total Items: 16785
Pesticide, PCB, and lead residues and necropsy data for bald eagles from 32 states - 1978-81
In 1978–81, 293 bald eagles (Haliaeetus leucocephalus) from 32 states were necropsied and analyzed for organochlorine pesticides, polychlorinated biphenyls (PCB), and lead residues. DDE was found in all carcasses; PCB, DDD, trans-nonachlor, dieldrin and oxychlordane were next in order of percent frequency of detection. The median levels of DDE and PCB have declined when compared with previous coll
Authors
W. L. Reichel, Shelia K. Schmeling, E. Cromartie, T. E. Kaiser, A. J. Krynitsky, T. G. Lamont, B. M. Mulhern, R. M. Prouty, C. J. Stafford, D. M. Swineford
Larval dermestid beetles feeding on nestling snail kites, wood storks, and great blue herons
In recent years abdominal lesions attributable to larval dermestid beetles (Dermestes nidum) have appeared in nestling Snail (Everglade) Kites (Rostrhamus sociabilis), Wood Storks (Mycteria americana), and Great Blue Herons (Ardea herodias). Although it appears that most nestlings affected have survived, the degree of threat posed by dermestid larvae to various avian species is as yet unclear.
Authors
N.F.R. Snyder, J.C. Ogden, J.D. Bittner, G.A. Grau
Effects of heptachlor- and lindane-treated seed on Canada geese
A study of Canada geese (B. canadensis) was conducted in the Pacific Northwest from 1978 through 1981. Lowered reproductive success, mortality of adults, and a population decline of resident western Canada geese (B. c. moffitti) at the Umatilla National Wildlife Refuge (Umatilla NWR) Oregon and Washington [USA] were associated with the use of heptachlor-treated wheat. Analyses of eggs and tissues
Authors
L. J. Blus, C. J. Henny, D.J. Lenhart, T. E. Kaiser
Contaminants in wood stork eggs and their effects on reproduction, Florida, 1982
One egg was removed from five Wood Stork (Mycteria americana) nests at each of eight colonies in central and northern Florida in 1982. DDE and mercury were present in all eggs with concentrations ranging up to 9.4 and 0.73 ppm wet weight, respectively. PCBs were detected in 25 eggs (63%) with a high value of 3.5 ppm. Other organochlorine compounds occurred in less than 30% of the eggs. Contaminant
Authors
W. J. Fleming, J.A. Rodgers, C. J. Stafford
Brain cholinesterase activity in fledgling starlings: Implications for monitoring exposure of songbirds to ChE inhibitors
Exposure of songbirds to organophosphate and carbamate pesticides is often determined by comparing the brain cholinesterase (ChE) activity of individuals that have been exposed with that of unexposed birds of the same species (e.g., see Busby et al. 1981, 1982; Hamilton et al. 1981). Knowledge of the normal pattern of ChE development in the brains of nestling and fledgling passerines is a necessar
Authors
C. E. Grue, C.C. Hunter
Potential of cobalt and other metals in ferromanganese crusts on seamounts of the Central Pacific Basin
No abstract available.
Authors
P.E. Halbach, Frank T. Manheim
Third report to the fish farmers : the status of warmwater fish farming and progress in fish farming research
No abstract available.
Authors
Huner Jay V. Dupree H. K.
Optimal timing in biological processes
A general approach for obtaining solutions to a class of biological optimization problems is provided. The general problem is one of determining the appropriate time to take some action, when the action can be taken only once during some finite time frame. The approach can also be extended to cover a number of other problems involving animal choice (e.g., mate selection, habitat selection). Ret
Authors
Byron K. Williams, James D. Nichols
Chance-corrected classification for use in discriminant analysis: Ecological applications
A method for evaluating the classification table from a discriminant analysis is described. The statistic, kappa, is useful to ecologists in that it removes the effects of chance. It is useful even with equal group sample sizes although the need for a chance-corrected measure of prediction becomes greater with more dissimilar group sample sizes. Examples are presented.
Authors
Kimberly Titus, James A. Mosher, Byron K. Williams
Organophosphate residues in grasshoppers from sprayed rangelands
Grasshoppers (Orthoptera) were collected in pastures that had been sprayed with malathion and acephate to estimate the secondary exposure of insectivorous birds to those pesticides. Residues of malathion were below 3 ppm at 30 and 54 hours after spraying and no malaoxon was detected. In contrast, acephate was found at 8 and 9 ppm 4 hours after spray; 3–5 ppm of the toxic metabolite methamidophos w
Authors
K. L. Stromborg, L. C. McEwen, Thair Lamont
Eggshell thickness and reproduction in American kestrels exposed to chronic dietary lead
American kestrels (Falco sparverius) were randomly paired and fed 0, 10, or 50 ppm metallic lead in their diet from November 1979–May 1980. Lead levels were elevated in bones and livers of birds receiving the treated diets, particularly the 50 ppm treatment group. Differential deposition of lead was noted between males and females, with the highest levels in the females. No adverse effects were ev
Authors
Oliver H. Pattee
Presence and biomagnification of organochlorine chemical residues in oxbow lakes of northeastern Louisiana
Ninety-eight samples of 16 species of animals were collected at Lake Providence, 88 samples of 15 species at Lake Bruin, and 21 samples of 5 species at Lake St. John, Louisiana, between 15 July and 25 September 1980. Residues of 13 organochlorine compounds were identified in these samples. Substantial concentrations of many of these compounds throughout the food webs of all three lakes showed that
Authors
K. R. Niethammer, Donald H. White, Thomas S. Baskett, M. W. Sayre