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Biomedical subjects

D J Forrester

Publications and source records attributed to D J Forrester.

At least 55 records · Page 3Linked to original sources
PubMed1981

Interrelationships of parasites of white-winged doves and mourning doves in Florida.

The parasites of indigenous populations of mourning doves (Zenaida macroura) in north and south Florida were compared with those of an introduced population of white-winged doves (z. asiatica) in south Florida. Thirty-two species of parasites including 5 protozoans, 7 nematodes, 2 trematodes, 2 cestodes, 7 acarines, 7 mallophagans, and 2 dipterans were found. Of these, 16 common to both species of doves. Mourning doves from north Florida showed a more diverse parasite fauna than did the white-winged or mourning dove populations from south Florida. Nematodes were the most common parasites in all three populations; infected doves contained one or two nematode species per dove. Total helminth burdens per infected dove averaged 13.1 for white-winged doves, 19.9 for mourning doves in south Florida, and 6.6 for mourning doves in north Florida. The prevalence of infections by Trichomonas gallinae was higher in white-winged doves (97%) than in mourning doves in south Florida (17%) or in mourning doves in north Florida (1%). The high prevalence of this parasite in expanding populations of white-winged doves may pose a threat to mourning dove populations since some strains of T. gallinae are pathogenic.

Animals↗
PubMed1980

Effects of blood-induced infections of Plasmodium hermani on domestic and wild turkey poults.

Experimental blood-induced infections of Plasmodium hermani were studied in young domestic and laboratory-reared wild turkey poults. Anemia, splenomegaly and decreased growth rates were observed, but no mortality due to the malarial infections occurred. It is suggested that malaria, acting in concert with other factors, may contribute to mortality of wild turkey poults in Florida during the first 3 to 4 weeks after hatching.

Animals↗
PubMed1980

An epizootic of avian botulism in a phosphate mine settling pond in northern Florida.

Type C botulism was determined to be the cause of an epizootic among waterfowl and shorebirds in a phosphate mine settling pond in northern Florida during May and June of 1979. Several hundred birds, the most common of which were American coots (Fulica americana), wood ducks (Aix sponsa), common gallinules (Gallinula chloropus), and northern shovelers (Anas clypeata), were afflicted over about a three-week period. A second smaller outbreak occurred in the same pond in early December of 1979. This is apparently the first time that botulism has been reported in waterbirds of Florida.

Animals↗
PubMed1980

Hematozoa of wood ducks (Aix spons) in the Atlantic flyway.

A total of 213 wood ducks (Aix sponsa) from 24 localities in 12 states in the Atlantic Flyway was examined for blood parasites in 1976 and 1977. Hematozoa were present in birds from every collection site from Virginia northward to Maine. Only one infection was detected in birds from North Carolina southward to Florida. Haemoproteus nettionis was the most common parasite, occurring in 56% of the northern wood ducks; Leucocytozoon simondi (20%), Plasmodium circumflexum (6%), and microfilariae (18%) were found also. Plasmodium, Leucocytozoon, and microfilariae were more commonly observed in juvenile birds than adults. There was no difference in prevalence between male and female ducks. The prevalence of each parasite species varied among collection sites in the northern states.

Animals↗
PubMed1980

Culex nigripalpus: a natural vector of wild turkey malaria (Plasmodium hermani) in Florida.

Durking 1977 and 1978, more than 21,000 female mosquitoes of 15 species were live-trapped in south Florida where high numbers of wild turkeys (Meleagris gallopavo) are known to harbor malarial infections. By inoculation of mosquito extracts into uninfected domestic poults, the presence of sporozoites of Plasmodium hermani was demonstrated in Culex nigrapalpus. This mosquito, previously shown to be a competent experimental vector, is believed to be the primary natural vector of wild turkey malaria in Florida.

Animals↗
PubMed1980

Haemoproteus meleagridis Levine 1961: redescription and developmental morphology of the gametocytes in turkeys.

Haemoproteus meleagridis Levine 1961 is redescribed and illustrated from material obtained from wild and domestic turkeys (Meleagris gallopavo) in Florida and Georgia. The mature gametocyte of this haemoproteid surrounds the erythrocytic nucleus, occupies 80 to 90% of the host-cell-parasite complex, and causes atrophy of the host cell's nucleus and hypertrophy of the host cell. The developmental sequence of H. meleagridis was studied critically. Following the entry of merozoites into the erythrocytes, they grew into halteridial and then circumnuclear forms. This was followed by a 10- to 13-day period during which trophozoites were not detectable by blood smear, and after which, the trophozoites returned to the peripheral circulation.

Animals↗
PubMed1980

A haemogregarine from the American alligator (Alligator mississippiensis).

Haemogregarina crocodilinorum Börner 1901 is redescribed from the blood of the American Alligator (Alligator mississippiensis). Gametocytes occurred in erythrocytes and erythrocytic schizonts contained about eight merozoites (range, 6--12). Gametogony and sporogony occurred in the gut of the leech, Placobdella multilineata and intracellular, unisporocystic oocysts were found within epithelial cells of the leech's intestinal wall. Presumed sporozoites were present in the intestinal contents. Attempts to transmit the parasite via leeches failed. The haemogregarine was widely distributed in southern United States and was found in 77 (59%) of 130 alligators examined. A comparison of this parasite is made with other haemogregarines reported from crocodilian reptiles.

Alligators and Crocodiles↗
PubMed1979

Serologic survey for Toxoplasma gondii in wild animals in Florida.

Blood samples were collected for serum separation from 114 species of wild animals (25 species of mammals, 82 species of birds, and 7 species of reptiles) in Florida. Each of the 3,471 samples was tested for antibodies to Toxoplasma gondii, using the indirect hemagglutination test. The highest prevalences of T gondii antibodies were 19% in armadillos (Dasypus novemcinctus), 18% in raccoons (Procyon lotor), 13% in black rats (Rattus rattus), and 11% in opossums (Didelphis marsupialis). Antibody prevalences were significantly higher in male than in female raccoons (P less than 0.05) and in adult than in nonadult raccoons and opossums (P less than 0.005). A high proportion of seropositive animals was found in three other mammalian species: 4 of 4 black bears (Ursus americanus), 2 of 3 bobcats (Lynx rufus), and 2 of 8 Norway rats (Rattus norvegicus) tested. Antibodies were found in 8 of the 1,279 avian serums; they were not found in any of the 13 reptilian serums tested. There were no significant geographic variations in antibody prevalence in any species.

Animal Population Groups↗
PubMed1979

Antimicrobial resistant Salmonella spp. isolated from double-crested cormorants (Phalacrocorax auritus) and common loons (Gavia immer) in Florida.

Antimicrobial resistant Salmonella spp. were found in double-crested cormorants and common loons in Florida. Single or multiple resistance occurred in all Salmonella agona isolates from cormorants, primarily to ampicillin, sulfonamids, streptomycin, neomycin, and kanamycin. Similar patterns of resistance were found in S. agona isolates from common loons. In addition, isolates of S. Saint paul from loons were found resistant to tetracycline and streptomycin, while 2 of 7 isolates of S. infantis were resistant to tetracycline only.

Ampicillin↗
PubMed1978

Coccidia of whooping cranes.

Coccidial oocysts were observed in 6 of 19 fecal samples from free-ranging whooping cranes (Grus americana) and 4 of 16 samples from captive whooping cranes. Eimeria gruis occurred in four free-ranging whooping cranes and E. reichenowi in two free-ranging and two captive whooping cranes. Fecal samples from two captive cranes contained oocysts of Isospora lacazei which was considered a spurious parasite. Oocysts of both species of Eimeria were prevalent in fecal samples collected from three free-ranging Canadian sandhill cranes (G. canadensis rowani) from whooping crane wintering grounds in Texas. These coccidia were prevalent also in fecal samples from 14 sandhill cranes (of 4 subspecies) maintained in captivity at the Patuxent Wildlife Research Center in Maryland.

Animals↗
PubMed1977

Starvation-pesticide unteraetions in juvenile brown pelicans.

Nineteen 9-week-old brown pelicans (Pelecanus occidentalis), obtained from a colony in Vero Beach, Florida, containing environmentally acquired p,p'-DDE residues, were subjected to a food deprivation experiment. Samples of brain, liver, muscle, and fat taken after one and two week periods of starvation indicated that starved birds contained significantly greated residue levels in fat compared to non-starved controls. Such differences were not observed in residues in the other tissues. The significance of these findings is discussed in relation to the biology of brown pelicans.

Animals↗