| hydrodynamic effect of a satellite transmitter on a juvenile green turtle (chelonia mydas) | wind tunnel tests were performed to measure the effect of a satellite transmitter on a juvenile green turtle (chelonia mydas). a full-scale turtle model was constructed from an 11.5 kg specimen with a 48 cm carapace length, and a transmitter model was constructed from a telonics st-6. the turtle model was tested in a wind tunnel with and without the transmitter, which was mounted on the forward, topmost part of the carapace. drag, lift and pitch moment were measured for several speeds and flow a ... | 1998 | 9698584 |
| the environmental contaminant dde fails to influence the outcome of sexual differentiation in the marine turtle chelonia mydas. | in many turtles, the temperature experienced during the middle of egg incubation determines the sex of the offspring. the implication of steroid sex hormones as the proximate trigger for sex determination opens the possibility that endocrine-disrupting contaminants may also influence the outcome of sexual differentiation. in this study we investigate the potential effects of dde (a common ddt metabolite) on sexual differentiation of chelonia mydas (green sea turtle). four clutches of eggs collec ... | 1998 | 9485482 |
| spirorchidiasis and fibropapillomatosis in green turtles from the hawaiian islands. | pathologic examination of green turtles (chelonia mydas) from the hawaiian islands (usa) was performed to determine the primary cause of mortality. lesions were associated with fibropapillomatosis (fp) and/or spirorchidiasis (sp) in 16 of 17 green turtles examined. gross lesions included moderate to severe emaciation, lobulated fibropapillomas of different size classes, serous atrophy of fat, and edema of subcutaneous tissue and muscle. anasarca, hydropericardium and pulmonary edema were common ... | 1998 | 9476230 |
| observations of fibropapillomatosis in green turtles (chelonia mydas) in indonesia. | to determine the prevalence and manifestations of fibropapillomatosis in green turtles in indonesia, to identify any relationship between fibropapillomatosis and concurrent parasitic infection, to ascertain the effect of fibropapillomatosis on health, and to examine whether environment might have an effect on the prevalence of fibropapillomatosis. | 1997 | 9406633 |
| simulated hibernation of sea turtles in the laboratory: i. feeding, breathing frequency, blood ph, and blood gases. | captive immature green (chelonia mydas) and kemp's ridley (lepidochelys kempi) sea turtles were examined to determine if a hibernation-like state could be induced under controlled conditions. both species demonstrated that they are able to acclimate to cold temperatures behaviorally. however, the two species appeared to respond differently to decreasing temperature. whereas the green turtles tolerated the onset of cold water temperatures by reducing swimming activity, the ridleys became very agi ... | 1997 | 9262006 |
| philopatry of male marine turtles inferred from mitochondrial dna markers. | recent studies of mitochondrial dna (mtdna) variation among marine turtle populations are consistent with the hypothesis that females return to beaches in their natal region to nest as adults. in contrast, less is known about breeding migrations of male marine turtles and whether they too are philopatric to natal regions. studies of geographic structuring of restriction fragment and microsatellite polymorphisms at anonymous nuclear loci in green turtle (chelonia mydas) populations indicate that ... | 1997 | 9238077 |
| efficacy of praziquantel in the treatment of green sea turtles with spontaneous infection of cardiovascular flukes. | to assess the efficacy of praziquantel as a treatment for cardiovascular flukes in turtles. | 1997 | 9247687 |
| phylogeography and population structure of the atlantic and mediterranean green turtle chelonia mydas: a mitochondrial dna control region sequence assessment. | mitochondrial (mt) dna sequences were analysed to resolve the phylogeography and population genetic structure of atlantic and mediterranean populations of green turtles (chelonia mydas). analysis of sequence variation over 487 base pairs of the control (d-loop) region identified 18 haplotypes among 147 individuals from nine nesting populations. pairwise comparisons of haplotype frequencies distinguished most nesting colonies, indicating significant genetic differentiation among rookeries and a s ... | 1996 | 8794558 |
| structure and function of the gastrointestinal tract of the florida manatee, trichechus manatus latirostris. | the florida manatee, trichechus manatus latirostris (sirenia: trichechidae), is the largest herbivorous marine mammal. previously, components of the gastrointestinal (gi) tract of the species have been described, but no comprehensive descriptions of the gross and microscopic anatomy existed. this study integrates function and structure of the entire florida manatee gi tract. | 1996 | 8800413 |
| green turtle fibropapillomatosis: challenges to assessing the role of environmental cofactors. | green turtle fibropapillomatosis (gtfp) is a growing threat to the survival of green turtle (chelonia mydas) populations worldwide. recent transmission studies point to an infectious etiology. several field studies suggest that high gtfp prevalence is associated with marine habitats that have been impacted by agricultural, industrial, or urban development. environmental contaminants could be involved in gtfp through several plausible mechanisms including cocarcinogenesis and contaminant-induced ... | 1995 | 7556020 |
| mitochondrial dna control region polymorphisms: genetic markers for ecological studies of marine turtles. | we describe a rapid and sensitive method for the detection of population-specific genetic markers in mitochondrial dna (mtdna) and the use of such markers to analyse population structure of marine turtles. a series of oligonucleotide primers specific for the amplification of the mtdna control region in cheloniid turtles were designed from preliminary sequence data. using two of these primers, a 384-385-bp sequence was amplified from the 5' portion of the mtdna control region of 15 green turtles ... | 1994 | 7921361 |
| ocular fibropapillomas of green turtles (chelonia mydas). | histologic evaluation of four eyes from three stranded juvenile green turtles (chelonia mydas) from florida, usa revealed ocular fibropapillomas composed of an overlying hyperplastic epithelium, various amounts of a thickened, well vascularized, collagenous stroma, and a moderate-to-dense population of reactive fibroblasts. the histologic morphology of the ocular fibropapillomas varied depending on whether the eyelid, conjunctiva, limbus, or cornea was the primary site of tumor origin. fibropapi ... | 1994 | 8053128 |
| oxygen transport in marine green turtle (chelonia mydas) hatchlings: blood viscosity and control of hemoglobin oxygen-affinity | erythrocytes from green turtle hatchlings contain a single embryonic component, unlike those from other cleidoic eggs, in which adult hemoglobin (hb) constitutes a significant fraction of total hb at hatching. the functional properties of the isolated and purified green turtle hatchling hb that distinguish it from adult hb are a high affinity for oxygen and marked sensitivity to organic phosphate modulators. hatchling erythrocytes also contain higher concentrations of atp and 2,3-diphosphoglycer ... | 1994 | 9317427 |
| epizootic mortality of free-living green turtles, chelonia mydas, due to coccidiosis. | at least 70 wild green sea turtles, chelonia mydas, died in the moreton bay area of southeast queensland, australia over 6 wk in spring 1991. based on the necropsy of 24 turtles, there was a severe enteritis or encephalitis associated with caryospora cheloniae, a coccidial pathogen previously recorded only in farm-reared ch. mydas hatchlings. infection was characterized by the presence of coccidia in extra-intestinal lesions. oocysts were observed to sporulate, after which sporozoites escaped in ... | 1993 | 8355356 |
| a molecular phylogeny for marine turtles: trait mapping, rate assessment, and conservation relevance. | nucleotide sequences from the cytochrome b gene of mitochondrial dna were employed to resolve phylogenetic controversies and to assess molecular evolutionary rates in marine turtles (chelonioidea). findings of special relevance to conservation biology include discovery of a distant relationship between natator and other cheloniid species, the paraphyly of chelonia mydas with respect to chelonia agassizi, and genetic distinctiveness of lepidochelys kempi from lepidochelys olivacea. a longstanding ... | 1993 | 8516304 |
| pcr-based assays of mendelian polymorphisms from anonymous single-copy nuclear dna: techniques and applications for population genetics. | this paper outlines a pcr-based approach for population genetics that offers several advantages over conventional southern blotting methods for revealing restriction-fragment-length polymorphisms (rflps) in nuclear dna. primers are constructed from clones isolated from a nuclear dna library, and these primers subsequently are employed in in vitro syntheses of homologous regions. amplified products are then screened directly for rflps by using gel-staining procedures. population applications for ... | 1993 | 8098128 |
| blood profiles for a wild population of green turtles (chelonia mydas) in the southern bahamas: size-specific and sex-specific relationships. | blood biochemical profiles and packed cell volumes were determined for 100 juvenile green turtles, chelonia mydas, from a wild population in the southern bahamas. there was a significant correlation of body size to 13 of the 26 blood parameters measured. only plasma uric acid and cholesterol were significantly different between male and female turtles. the relationship between total plasma proteins and plasma refractive index was significant. the equation for converting refractive index (y) to t ... | 1992 | 1512872 |
| global population genetic structure and male-mediated gene flow in the green turtle (chelonia mydas): rflp analyses of anonymous nuclear loci. | we introduce an approach for the analysis of mendelian polymorphisms in nuclear dna (ndna), using restriction fragment patterns from anonymous single-copy regions amplified by the polymerase chain reaction, and apply this method to the elucidation of population structure and gene flow in the endangered green turtle, chelonia mydas. seven anonymous clones isolated from a total cell dna library were sequenced to generate primers for the amplification of ndna fragments. nine individuals were screen ... | 1992 | 1350555 |
| ocular dimensions and schematic eyes of freshwater and sea turtles. | measurements were made of the ocular dimensions from living and frozen eyes of one species of freshwater turtle, pseudemys scripta elegans, and of three species of marine turtles, chelonia mydas, dermochelys cariacea, and eretmochelys imbricata. estimates of refractive error by retinoscopy were also obtained with eyes in air and under water. the results suggest that unaccommodated eyes of all four species are approximately emmetropic in air but strongly hyperopic in water. schematic eyes were ca ... | 1991 | 1772809 |
| dna fingerprinting in reptiles: bkm hybridization patterns in crocodilia and chelonia. | the simple tetranucleotide repeat gata (gaca) occurs in all eukaryotes so far studied. in many species, the arrangement of these sequences varies considerably among individuals. thus gata (gaca) type probes produce dna fingerprints when hybridized with restricted dna from different individuals within a species. banded krait minor (bkm) satellite dna (related to sequences originally recovered from the w chromosome of the banded krait and consisting essentially of a series of gata repeats) is foun ... | 1991 | 1889739 |
| wavelength-dependent temporal properties of retinal horizontal cells in turtles. | electrical responses of luminosity horizontal cells (l cells) to monochromatic stimuli were analyzed by intracellular recordings in the retinas of the freshwater turtle (pseudemys scripta elegans) and of the sea turtle (chelonia mydas mydas). light intensity, duration, and wavelength were varied to assess temporal effects. for a given intensity of monochromatic light, response amplitude increased with stimulus duration until maximum amplitude occurred at a specific duration. this suprathreshold ... | 1990 | 2271453 |
| cutaneous fibropapillomas and renal myxofibroma in a green turtle, chelonia mydas. | a debilitated 7 kg juvenile green turtle (chelonia mydas mydas) with multiple ulcerated and infected cutaneous fibropapillomas was clinically evaluated and found to have a nonregenerative anemia, hypoproteinemia, hypoalbuminemia and several electrolyte abnormalities. surgery was performed to remove the larger tumors. the turtle did not eat postsurgically, and an attempt was made to place a pharyngostomy tube utilizing endoscopy. edematous esophageal papillae, the angulation of the gastroesophage ... | 1990 | 2338730 |
| cutaneous fibropapillomas of green turtles (chelonia mydas). | six juvenile green turtles (chelonia mydas) from the indian river lagoon system, florida, u.s.a., with multiple cutaneous fibropapillomas, were kept in isolation and examined over a 6-month period. histologically, the fibropapillomas consisted of a slightly to moderately hyperplastic epidermis overlying a thickened hypercellular dermis. in the earliest lesions, ballooning degeneration was present predominantly in the stratum basale where rete ridges extended into the dermis; aggregates of mixed ... | 1989 | 2677067 |
| an odyssey of the green sea turtle: ascension island revisited. | green turtles (chelonia mydas) that nest on ascension island, in the south-central atlantic, utilize feeding grounds along the coast of brazil, more than 2000 km away. to account for the origins of this remarkable migratory behavior, carr and coleman [carr, a. & coleman, p. j. (1974) nature (london) 249, 128-130] proposed a vicariant biogeographic scenario involving plate tectonics and natal homing. under the carr-coleman hypothesis, the ancestors of ascension island green turtles nested on isla ... | 1989 | 16594013 |
| conformational changes of alpha-macroglobulin and ovomacroglobulin from the green turtle (chelonia mydas japonica). | green turtle plasma alpha-macroglobulin and ovomacroglobulin underwent conformational changes when they were treated with proteinases or methylamine. their conformational changes were studied by hplc gel chromatography, circular dichroism, and electron microscopy. the stokes radii of native green turtle alpha-macroglobulin and ovomacroglobulin were estimated to be 84.3 +/- 0.5 a, and 93.0 +/- 0.5 a, respectively, by means of an hplc experiment. after reaction with methylamine or proteinases, the ... | 1988 | 2453504 |
| pulmonary function of the green sea turtle, chelonia mydas. | lung volumes, oxygen uptake (vo2), end-tidal po2, and pco2, diffusing capacity of the lungs for co (dlco), pulmonary blood flow (ql) and respiratory frequency were measured in the green sea turtle (chelonia mydas) (49-127 kg body wt). mean lung volume (vl) determined from helium dilution was 57 ml/kg and physiological dead space volume (vd) was about 3.6 ml/kg. ql, determined from acetylene uptake during rebreathing, increased in proportion to vo2 with temperature. therefore, constant o2 content ... | 1987 | 3558205 |
| volatile fatty acid concentrations in the digestive tract of the west indian manatee, trichechus manatus. | 1. digesta samples were collected from five west indian manatees, trichechus manatus, for volatile fatty acid (vfa) analysis. 2. mean total vfa concentrations were low in the stomach and duodenum (18.6 and 12.3 mm/l, respectively). mean vfa concentrations were considerably higher in the cecum and colon (220.6 and 307.3 mm/l, respectively). 3. the relative proportions of the individual vfa's shifted from predominantly acetic acid in the foregut to a mixture of acetic, butyric and propionic acids ... | 1987 | 3677614 |
| occurrence of hydroxysteroid oxidoreductases in liver of turtles. | 1. hydroxysteroid oxidoreductases have been partially purified from the cytosol fraction (105,000 g supernatant) of liver from a fresh-water turtle (podocnemis expansa) and a sea-water turtle (chelonia mydas mydas) by precipitation with ammonium sulphate (as, 10-80% saturation). 2. the following enzymes were detected (substrates in brackets): 3 alpha-hydroxysteroid oxidoreductase (androsterone), 3 beta-hydroxysteroid oxidoreductase (dhea) and 17 beta-hydroxysteroid oxidoreductase (testosterone, ... | 1987 | 2827953 |
| [coronary vascularization of the marine turtle chelonia mydas]. | the irrigation of the heart of the green turtle (chelonia mydas) was studied through the clearing and disection techniques. five coronary new irrigation patterns were found. the presence of anastomoses is discussed along with the number and position of the colateral vessels. | 1986 | 3423337 |
| myoglobin interspecies structural differences: effects on autoxidation and oxygenation. | thermodynamic and kinetic parameters of the oxygenation and autoxidation reactions were determined for yellowfin tuna (thunnus albacares), pacific green sea turtle (chelonia mydas caranigra), and sperm whale myoglobin. these proteins have quite similar heme contact residues, but vary in residues which are involved in globin stabilization and in postulated ligand paths to the heme iron. oxygen equilibria measurements from 10 to 40 degrees c reveal that green sea turtle myoglobin has a lower oxyge ... | 1986 | 3740846 |
| reevaluation of the relative activities of the pituitary glycoprotein hormones (follicle-stimulating hormone, luteinizing hormone, and thyrotrophin) from the green sea turtle, chelonia mydas. | the discovery that the follicle-stimulating hormone (fsh) previously prepared from the green sea turtle, chelonia mydas, contained a major neurohypophysial contaminant prompted a repurification and characterization of the glycoprotein hormones in this turtle. results reaffirmed the physicochemical distinctiveness of the three hormones. minimal cross-contamination between hormones (less than 2%) was achieved by ion-exchange chromatography, subunit dissociation (of contaminating luteinizing hormon ... | 1985 | 2989082 |
| the morphology of the kidney of the green turtle (chelonia mydas l.). | the kidneys of the green turtle are flattened, lobed and closely applied to the posterior wall of the pleuroperitoneal cavity. the ability to differentiate new functional nephrons is retained by five years old animals. the functional nephron comprises a glomerulus, proximal tubule, intermediate segment which can be subdivided into a proximal non-secretory segment and a distal mucus secreting segment, distal convoluted tubule and collecting tubule. both the proximal and distal tubules exhibit com ... | 1985 | 4066475 |
| cell-mediated immune response of chelonia mydas. | blastogenic and cytotoxic responsiveness of peripheral blood leukocytes from the green turtle, chelonia mydas were examined. blastogenic responses were low level and showed considerable variation between animals. blastogenesis in response to phytohemagglutinin and concanavalin a was observed through out all seasons. responses to pokeweed mitogen and lipopolysaccharide were seasonal, appearing in spring. no blastogenic response to protein a or allogeneic leukocytes was observed. cytotoxic respons ... | 1985 | 4043482 |
| the respiratory epithelium of the lung in the green turtle (chelonia mydas l.). | the chelonian lung exhibits reptilian, mammalian and avian features. the respiratory epithelium is typically vertebrate, i.e. pseudostratified columnar with cilia; gaseous exchange areas appear at all levels from the respiratory bronchi down to the alveoli. the latter are invested with a capillary network and both type i and type ii cells are present. the possible functional significance of the distribution of collagen, elastic tissue, cartilage and smooth muscle is discussed. | 1984 | 6490523 |
| the characterisation and distribution of cells lining the axillary gland of the adult green turtle (chelonia mydas l.). | the axillary gland of the marine turtle lies in the angle formed by the carapace and plastron. the gland is compound tubular and the secretions released by the various acini are conveyed to the exterior via a large excretory duct lined by stratified squamous non-keratinised epithelium. the main secretory areas are lined by holocrine cells, i.e. they degenerate on discharging their contents. the epithelium lining the short ducts which carry the holocrine secretions to the large excretory duct is ... | 1984 | 6715249 |
| the primary structure of myoglobin from pacific green sea turtle (chelonia mydas caranigra). | the amino acid sequence of the main component myoglobin from skeletal muscle of pacific green sea turtle (chelonia mydas caranigra) has been determined. the globin is 153 residues in length and has a free amino-terminus. the heme-binding and internal residues are as found in mammalian myoglobins. ten substitutions are observed between this myoglobin and that from map turtle. about 38, 52, 47 and 86 substitutions are noted in comparison with the myoglobins of other reptiles, mammals, birds and fi ... | 1983 | 6824692 |
| anesthesia in the green sea turtle, chelonia mydas. | | 1982 | 7149396 |
| temperature-dependent sex determination: current practices threaten conservation of sea turtles. | temperature determines the sex of hatchling green turtles (chelonia mydas) produced from eggs incubated in a beach hatchery under different temperature regimens. cola and cool nests (less than 28 degrees c) produced almost no females (0 to 10 percent) and warm, thermostable nests (greater than 29.5 degrees c) produced almost all females (95 to 100 percent). a few intersex hatchlings were produced at lower temperatures. since little concern is given to temperatures at which sea turtle eggs are in ... | 1982 | 7079758 |
| pathological changes associated with cardiovascular trematodes (digenea: spirorchidae) in a green sea turtle chelonia mydas (l). | | 1981 | 7320241 |
| metabolism of testosterone in vitro by brain and pituitary slices of a seawater turtle (chelonia mydas mydas) and freshwater turtle (podocnemis expansa). | | 1981 | 7265967 |
| metabolism of testosterone and progesterone by liver homogenates of the seawater turtle (chelonia mydas mydas) in vitro. | | 1981 | 7265966 |
| temperature effects on ventilation and acid-base balance of the green turtle. | ventilation (ve), pulmonary gas exchange (mo2 and mco2), and arterial acid-base status (ph and paco2) were measured in immature green turtles. chelonia mydas, equilibrated at 15, 25, and 35 degrees c. from 25 to 35 degrees c, ph decreased by 0.0134 u/degrees c and paco2 increased from 30.1 +/- 1.1 to 46.0 +/- 2.4 torr (mean +/- se, n = 8) in conformity with results from other ectotherms. from 15 to 25 degrees c, however, ph fell on the average by 0.06 u/degrees c but the change was not significa ... | 1980 | 6776816 |
| melatonin in the blood and cerebrospinal fluid of the green sea turtle (chelonia mydas). | | 1980 | 7189168 |
| [sanitary and pathological problems in the intensive rearing of turtles (chelonia mydas, l) on réunion island]. | | 1980 | 7455290 |
| serum gonadotropins and steroids associated with breeding activities in the green sea turtle chelonia mydas. i. captive animals. | | 1979 | 499756 |
| ventilatory response to inspired co2 in the sea turtle: effects of body size and temperature. | the ventilatory response of green turtles (chelonia mydas) to inspired co2 was tested. both immature (0.9--1.35 kg) and adult (59--130 kg) animals responded with increased ventilation (ve) that was primarily (immature) or exclusively (adult) due to increased respiratory frequency. the ve of the immature turtles while breathing air increased with temperatures between 15 and 35 degrees c with a q10 of 1.95, but the peak ve of these turtles while breathing 4.5% co2 in air was not significantly diff ... | 1979 | 515563 |
| radioimmunoassay of plasma progesterone, testosterone, total estrogen and immunoreactive gonadotropin in the nesting and non-nesting green sea turtle, chelonia mydas (l.). | plasma progesterone, testosterone, total estrogens and immunoreactive gonadotropin were measured in nesting and non-nesting sea turtles, chelonia mydas. progesterone and gonadotropin concentrations were significantly higher in nesting than in non-nesting turtles, testosterone was not significantly different in either group and total estrogens appeared to be slightly in the nesting group. | 1979 | 477901 |
| symbiotic cellulose degradation in green turtles, chelonia mydas l. | a postgastric, fermentative breakdown of structural plant tissue was demonstrated for green turtles. about 90% cellulose was hydrolyzed. bacterial and protozoan numbers compared with those of the rumen. | 1979 | 16345350 |
| seaward orientation of hatchling turtles: turning systems in the optic tectum. | this paper reports studies on the mechanisms underlying seaward orientation in hatchling turtles. the particular aim was to investigate whether activity in different regions of the retina and associated tectal areas, as assessed by some comparator mechanism, results in turning in different directions. hatchling green turtles (chelonia mydas) were tested for sea-finding ability in a natural situation on the beach following lesions of the optic tectum. asymmetrical bilateral lesions resulted in a ... | 1979 | 487064 |
| bile salts of the green turtle chelonia mydas (l.) | 1. bile salts of the green turtle chelonia mydas (l.) were analysed as completely as possible. 2. they consist of taurine conjugates of 3 alpha, 7 alpha, 12 alpha, 22 xi-tetrahydroxy-5 beta-cholestan-26-oic acid (tetrahydroxysterocholanic acid) and 3 alpha 12 alpha, 22 xi-trihydroxy-5 beta-cholestan-26-oic acid, with minor amounts of 3 alpha, 7 alpha, 12 alpha-trihydroxy-5beta-cholan-24-oic acid (cholic acid), 3alpha, 12 alpha-dihydroxy-5beta-cholan-24-oic acid (deoxycholic acid) and possibly ot ... | 1978 | 656052 |
| caryospora cheloniae sp. n.: a coccidial pathogen of mariculture-reared green sea turtles (chelonia mydas mydas). | caryospora cheloniae sp. n. is described from mariculture-reared green sea turtles (chelonia m. mydas). the sporulated oocyst has a thin, transparent, single-layered wall which often ruptures, leaving a naked sporulated sporocyst. oocysts measured 33.8 to 40.1 micrometer by 11.0 to 14.6 micrometer (mean 37.4 by 12.8 micrometer). greatest concentrations of developmental stages of c. cheloniae were found in the hindgut. transverse binary fission was observed in dividing tissue stages. pathologic a ... | 1978 | 418191 |
| immunological studies with the gonadotropins and their subunits from the green sea turtle chelonia mydas. | | 1977 | 562813 |
| quantitative requirement of the hatchling green sea turtle, chelonia mydas, for valine, leucine, isoleucine and phenylalanine. | hatchling green sea turtles were fed purified diets containing 36% crude protein (n x 6.25) to determine the quantitative requirements for valine, leucine, isoleucine and phenylalanine. expressed as percentage of total dry diet, the hatchling green sea turtle requires 1.3% valine, 1.6% leucine, 1.0% isoleucine and 1.0% phenylalanine (in the presence of 0.5% tyrosine). within the range of isoleucine-leucine levels investigated, there was no apparent interrelationship between the quantitative requ ... | 1977 | 886391 |
| ventilation, gas exchange and metabolic scaling of a sea turtle. | ventilation of green turtles (chelonia mydas) was affected by the position in which the animal was placed: supine animals breathed slowly 0.07 breaths/min) and deeply (8.0 l/breath); prone animals breathed more rapidly (0.43 breaths/min) and more shallowly (3.5 l/breath). from the respiratory exchange ratio and other indicators it appears that green turtles hyperventilate during exercise and hypoventilate during recovery. o2 consumption of the resting sea turtle (0.024 l-kg-1-h-1) is similar to ... | 1976 | 973053 |
| energetics of swimming of a sea turtle. | young (mean mass 735 g) green turtles (chelonia mydas) were able to swim in a water channel at sustained speeds between 0-14 and 0-35 m.s-1. oxygen consumption at rest was was 0-07 l.kg-1.h-1; at maximum swimming speed oxygen consumption was 3-4 times greater than at rest for a given individual. in comparison with other animals of the same body mass the cost of transport for the green turtle (0.186lo2.kg-1.km-1) is less than that for flying birds but greater than that for fish. from drag measure ... | 1976 | 1270983 |
| winter dormancy in sea turtles: independent discovery and exploitation in the gulf of california by two local cultures. | documentation is reported for sea turtles overwintering on the sea bottom. seri indians have traditionally hunted nonmigrating dormant green turtles (chelonia mydas) along the bottom of the infiernillo channel in the gulf of california. mexican fishermen independently discovered dormant turtles during winter 1972-1973, and with new hunting technologies are rapidly decimating these unusual stocks. | 1976 | 17832146 |
| mechanics of the respiratory cycle in the green turtle (chelonia mydas). | | 1974 | 4445611 |
| an operant method for the study of chemoreception in the green turtle, chelonia mydas. | | 1972 | 4653343 |
| spectral sensitivity of the green turtle (chelonia mydas mydas) determined by electrical responses to heterochromatic light. | | 1972 | 4653340 |
| microspectrophotometric measurements of visual pigments in two species of turtle, pseudemys scripta and chelonia mydas. | | 1971 | 5551491 |
| retinal oil globule counts and distributions in two species of turtles: pseudemys scripta elegans (wied) and chelonia mydas mydas (linnaeus). | | 1970 | 5435015 |
| hearing in the giant sea turtle, chelonia mydas. | measurement were made of the cochlear potentials in three specimens of the giant sea turtle, chelonia mydas, in response to both aerial and mechanical stimulation of the ear. the results show maximum sensitivity in the region of 300 to 400 hz, with a rather rapid decline in sensitivity for lower and especially for higher tones. the upper limit for the observation of cochlear potentials without injury is 2000 hz, and a practical limit of usefulness of this ear is probably about 1000 hz. | 1969 | 5264146 |
| the role of vision in the sea-finding orientation of the green turtle (chelonia mydas). 2. orientation mechanism and range of spectral sensitivity. | | 2013 | 5674233 |
| physiological adjustments to deep diving in the pacific green turtle (chelonia mydas agassizii). | | 1967 | 6051652 |
| preference for light of short wavelengths in hatchling green sea turtles, chelonia mydas, tested on their natural nesting beaches. | | 1967 | 6038298 |
| the role of vision in the sea-finding orientation of the green turtle (chelonia mydas). | | 1967 | 6031107 |
| physiological adjustments to prolonged diving in the pacific green turtle (chelonia mydas agassizii). | | 1966 | 5965104 |
| some aspects of electrolyte excretion in the green turtle, chelonia mydas mydas. | | 1964 | 14161614 |
| new blood flukes (trematoda: spirorchidae) from the marine turtle, chelonia mydas (l.). | | 1952 | 14946622 |
| mycotic pneumonia in mariculture-reared green sea turtles. | microbiologic examination of 29 juvenile green sea turtles with a buoyancy abnormality revealed pulmonary infection with sporotrichium sp, cladosporium sp, and paecilomyces sp. histologic examination of the lungs revealed granulomatous lesions containing branching septate hyphae. the diagnosis was mycotic pneumonia. | 1979 | 521376 |
| phylogenetic variation of chelonid alphaherpesvirus 5 (chhv5) in populations of green turtles chelonia mydas along the queensland coast, australia. | sea turtle fibropapillomatosis (fp) is a disease marked by the proliferation of benign but debilitating cutaneous and occasional visceral tumors, likely to be caused by chelonid alphaherpesvirus 5 (chhv5). this study presents a phylogeny of chhv5 strains found on the east coast of queensland, australia, and a validation for previously unused primers. two different primer sets (gb-1534 and gb-813) were designed to target a region including part of the ul27 glycoprotein b (gb) gene and part of ul2 ... | 2017 | 28524816 |
| examining the role of transmission of chelonid alphaherpesvirus 5. | marine turtle fibropapillomatosis (fp) is a devastating neoplastic disease characterized by single or multiple cutaneous and visceral fibrovascular tumors. chelonid alphaherpesvirus 5 (chhv5) has been identified as the most likely etiologic agent. from 2010 to 2013, the presence of chhv5 dna was determined in apparently normal skin, tumors and swab samples (ocular, nasal and cloacal) collected from 114 olive ridley (lepidochelys olivacea) and 101 green (chelonia mydas) turtles, with and without ... | 2017 | 28512730 |
| quantifying the spatial ecology of wide-ranging marine species in the gulf of california: implications for marine conservation planning. | there is growing interest in systematic establishment of marine protected area (mpa) networks and representative conservation sites. this movement toward networks of no-take zones requires that reserves are deliberately and adequately spaced for connectivity. here, we test the network functionality of an ecoregional assessment configuration of marine conservation areas by evaluating the habitat protection and connectivity offered to wide-ranging fauna in the gulf of california (goc, mexico). we ... | 2011 | 22163013 |
| residency and movement patterns of an apex predatory shark (galeocerdo cuvier) at the galapagos marine reserve. | the potential effectiveness of marine protected areas (mpas) as a conservation tool for large sharks has been questioned due to the limited spatial extent of most mpas in contrast to the complex life history and high mobility of many sharks. here we evaluated the movement dynamics of a highly migratory apex predatory shark (tiger shark galeocerdo cuvier) at the galapagos marine reserve (gmr). using data from satellite tracking passive acoustic telemetry, and stereo baited remote underwater video ... | 2017 | 28829820 |
| antibiotic resistant bacterial isolates from captive green turtles and in vitro sensitivity to bacteriophages. | this study aimed to test multidrug resistant isolates from hospitalised green turtles (chelonia mydas) and their environment in north queensland, australia, for in vitro susceptibility to bacteriophages. seventy-one gram-negative bacteria were isolated from green turtle eye swabs and water samples. broth microdilution tests were used to determine antibiotic susceptibility. all isolates were resistant to at least two antibiotics, with 24% being resistant to seven of the eight antibiotics. highest ... | 2017 | 29147114 |
| in vitroreplication of chelonid herpesvirus 5 in organotypic skin cultures from hawaiian green turtles (chelonia mydas). | fibropapillomatosis (fp) is a tumor disease of marine turtles associated with chelonid herpesvirus 5 (chhv5), which has historically been refractory to growth in tissue culture. here we show, for the first time,de novoformation of chhv5-positive intranuclear inclusions in cultured green turtle cells, which is indicative of active lytic replication of the virus. the minimal requirements to achieve lytic replication in cultured cells included (i) eitherin vitrocultures of chhv5-positive tumor biop ... | 2017 | 28615209 |
| further studies on the chemical nature of reptilian gonadotropins: fsh and lh in the american alligator and green sea turtle. | | 1976 | 1260093 |
| supplemental feeding and other anthropogenic threats to green turtles (chelonia mydas) in the canary islands. | green turtles are found in the waters of the canary islands but little is known about the ecology and anthropogenic pressures that threaten them. our results have revealed that juvenile green turtles, ranging in curve carapace length from 26.9-81.0cm, are regularly found in the archipelago and originate from rookeries in both the eastern and western atlantic. photo-identification and satellite tracking showed high levels of site fidelity to coastal foraging grounds associated with seagrass meado ... | 2018 | 29066195 |
| levels of trace elements, methylmercury and polybrominated diphenyl ethers in foraging green turtles in the south china region and their conservation implications. | sea turtles are globally endangered and face daily anthropogenic threats, including pollution. however, there is a lack of ecotoxicological information on sea turtles, especially in the asia-pacific region. this study aims to determine pollutant levels of foraging green turtles (chelonia mydas) in south china, including hong kong, guangdong and taiwan, as a basis for their conservation. scute, liver and muscle tissues of stranded green turtles were analysed for levels of 17 trace elements and me ... | 2018 | 29245147 |
| using expert opinion to prioritize impacts of climate change on sea turtles' nesting grounds. | managers and conservationists often need to prioritize which impacts from climate change to deal with from a long list of threats. however, data which allows comparison of the relative impact from climatic threats for decision-making is often unavailable. this is the case for the management of sea turtles in the face of climate change. the terrestrial life stages of sea turtles can be negatively impacted by various climatic processes, such as sea level rise, altered cyclonic activity, and increa ... | 2010 | 20702026 |
| determination and assessment of mercury content in calcareous soils. | this paper provides the first available information on the determination of the total mercury content in different mediterranean calcareous soils by thermal decomposition, amalgamation and atomic absorption spectrophotometry. fifty-three samples from five soil use groups (natural, dry land, greenhouse, irrigated and rice farming soils) were analysed. the results show that the levels of mercury in these soils were 9.4-1585mugkg(-1). soil organic matter and the zinc equivalent index have been rela ... | 2010 | 20004461 |
| [neotanal screening of congenital hypothyroidism. a major contribution to public health in the last few decades]. | | 2010 | 20004421 |
| the role of leaf nitrogen content in determining turtlegrass (thalassia testudinum) grazing by a generalized herbivore in the northeastern gulf of mexico. | in shallow marine environments the variability in grazing on seagrasses has been hypothesized to be controlled, in part, by the nutritive quality (i.e., nitrogen content) of their leaves. the few existing studies of the relationship between leaf nitrogen content and seagrass grazing have all found a positive relationship between leaf nitrogen content and preference by selective vertebrate grazers (i.e., the bucktooth parrotfish, green sea turtles, and dugongs). however, most marine herbivores (b ... | 2001 | 11239626 |
| purification of thyrotropin from the pituitaries of two turtles: the green sea turtle and the snapping turtle. | | 1981 | 7286628 |
| characterization of myoglobins from atlantic and pacific green sea turtles. | | 1976 | 1277793 |
| are thermal barriers "higher" in deep sea turtle nests? | thermal tolerances are affected by the range of temperatures that species encounter in their habitat. daniel janzen hypothesized in his "why mountain passes are higher in the tropics" that temperature gradients were effective barriers to animal movements where climatic uniformity was high. sea turtles bury their eggs providing some thermal stability that varies with depth. we assessed the relationship between thermal uniformity and thermal tolerance in nests of three species of sea turtles. we c ... | 2017 | 28545092 |
| the current situation of inorganic elements in marine turtles: a general review and meta-analysis. | inorganic elements (pb, cd, hg, al, as, cr, cu, fe, mn, ni, se and zn) are present globally in aquatic systems and their potential transfer to marine turtles can be a serious threat to their health status. the environmental fate of these contaminants may be traced by the analysis of turtle tissues. loggerhead turtles (caretta caretta) are the most frequently investigated of all the sea turtle species with regards to inorganic elements, followed by green turtles (chelonia mydas); all the other sp ... | 2017 | 28688307 |
| brevetoxin exposure in sea turtles in south texas (usa) during karenia brevis red tide. | five green (chelonia mydas) and 11 kemp's ridley (lepidochelys kempii) sea turtles found dead, or that died soon after stranding, on the southern texas (usa) coast during 2 karenia brevis blooms (october 2015, september-october 2016) were tested for exposure to brevetoxins (pbtx). tissues (liver, kidney) and digesta (stomach and intestinal contents) were analyzed by elisa. three green turtles found alive during the 2015 event and 2 kemp's ridley turtles found alive during the 2016 event exhibite ... | 2018 | 29384484 |
| potential effects of brevetoxins and toxic elements on various health variables in kemp's ridley (lepidochelys kempii) and green (chelonia mydas) sea turtles after a red tide bloom event. | natural biotoxins and anthropogenic toxicants pose a significant risk to sea turtle health. documented effects of contaminants include potential disease progression and adverse impacts on development, immune function, and survival in these imperiled species. the shallow seagrass habitats of florida's northwest coast (big bend) serve as an important developmental habitat for kemp's ridley (lepidochelys kempii) and green (chelonia mydas) sea turtles; however, few studies have been conducted in thi ... | 2017 | 28693110 |
| persistent organic pollutants in fat of three species of pacific pelagic longline caught sea turtles: accumulation in relation to ingested plastic marine debris. | in addition to eating contaminated prey, sea turtles may be exposed to persistent organic pollutants (pops) from ingesting plastic debris that has absorbed these chemicals. given the limited knowledge about pops in pelagic sea turtles and how plastic ingestion influences pop exposure, our objectives were to: 1) provide baseline contaminant levels of three species of pelagic pacific sea turtles; and 2) assess trends of contaminant levels in relation to species, sex, length, body condition and cap ... | 2018 | 28806556 |
| long distance biotic dispersal of tropical seagrass seeds by marine mega-herbivores. | terrestrial plants use an array of animals as vectors for dispersal, however little is known of biotic dispersal of marine angiosperms such as seagrasses. our study in the great barrier reef confirms for the first time that dugongs (dugong dugon) and green sea turtles (chelonia mydas) assist seagrass dispersal. we demonstrate that these marine mega-herbivores consume and pass in faecal matter viable seeds for at least three seagrass species (zostera muelleri, halodule uninervis and halophila dec ... | 2017 | 28667257 |
| satellite tracking of sympatric marine megafauna can inform the biological basis for species co-management. | systematic conservation planning is increasingly used to identify priority areas for protection in marine systems. however, ecosystem-based approaches typically use density estimates as surrogates for animal presence and spatial modeling to identify areas for protection and may not take into account daily or seasonal movements of animals. additionally, sympatric and inter-related species are often managed separately, which may not be cost-effective. this study aims to demonstrate an evidence-bas ... | 2014 | 24893163 |
| the discovery of deep-water seagrass meadows in a pristine indian ocean wilderness revealed by tracking green turtles. | our understanding of global seagrass ecosystems comes largely from regions characterized by human impacts with limited data from habitats defined as notionally pristine. seagrass assessments also largely focus on shallow-water coastal habitats with comparatively few studies on offshore deep-water seagrasses. we satellite tracked green turtles (chelonia mydas), which are known to forage on seagrasses, to a remote, pristine deep-water environment in the western indian ocean, the great chagos bank, ... | 2018 | 29573811 |
| potential noncutaneous sites of chelonid herpesvirus 5 persistence and shedding in green sea turtles chelonia mydas. | chelonid herpesvirus 5 (chhv5), the likely etiologic agent of sea turtle fibropapillomatosis (fp), is predicted to be unevenly distributed within an infected turtle, in which productive virus replication and virion shedding occurs in cutaneous tumor keratinocytes. in this study, we measured and compared chhv5 dna quantities in tumors, skin, urine, major organs, and nervous tissue samples from green turtles chelonia mydas. these samples were taken from the carcasses of 10 juvenile green turtles w ... | 2017 | 28438079 |
| genomic evolution, recombination, and inter-strain diversity of chelonid alphaherpesvirus 5 from florida and hawaii green sea turtles with fibropapillomatosis. | chelonid alphaherpesvirus 5 (chhv5) is a herpesvirus associated with fibropapillomatosis (fp) in sea turtles worldwide. single-locus typing has previously shown differentiation between atlantic and pacific strains of this virus, with low variation within each geographic clade. however, a lack of multi-locus genomic sequence data hinders understanding of the rate and mechanisms of chhv5 evolutionary divergence, as well as how these genomic changes may contribute to differences in disease manifest ... | 2018 | 29479497 |
| comparative analysis of tear composition in humans, domestic mammals, reptiles, and birds. | tears are an important component of the ocular surface protection mechanism and are in close contact with the corneal epithelium and the environment. their composition is well-known in humans; however, there are few investigations on the composition and function of tears in reptiles, birds and others mammals, which would elucidate the mechanisms governing the maintenance of ocular homeostasis. in this work, electrophoretic profiles and an evaluation of total protein, albumin, urea, glucose, and ... | 2020 | 32528986 |
| composition and divergence of coronavirus spike proteins and host ace2 receptors predict potential intermediate hosts of sars-cov-2. | from the beginning of 2002 and 2012, severe respiratory syndrome coronavirus (sars-cov) and middle east respiratory syndrome coronavirus (mers-cov) crossed the species barriers to infect humans, causing thousands of infections and hundreds of deaths, respectively. currently, a novel coronavirus (sars-cov-2), which has become the cause of the outbreak of coronavirus disease 2019 (covid-19), was discovered. until 18 february 2020, there were 72 533 confirmed covid-19 cases (including 10 644 severe ... | 2020 | 32100877 |
| experimental infection of mice with veronaea botryosa as a model for human phaeohyphomycosis. | veronaea botryosa is a ubiquitous, dematiaceous mold capable of causing cutaneous and subcutaneous lesions in humans. in the last decade, v. botryosa has been associated with emergent systemic fungal infections in aquatic animals, including cultured sturgeon (acipenser spp.), captive amphibians, and wild reptiles. recently, repetitive extragenic palindromic pcr (rep-pcr) fingerprinting has demonstrated intraspecific variability among v. botryosa isolates from different clinically affected hosts ... | 2019 | 31387667 |
| pharmacokinetics of ceftriaxone in green sea turtles (chelonia mydas) following intravenous and intramuscular administration at two dosages. | green sea turtles are widely distributed in tropical and subtropical waters. adult green sea turtles face many threats, primarily from humans, including injuries from boat propellers, being caught in fishing nets, pollution, poaching, and infectious diseases. to the best of our knowledge, limited pharmacokinetic information to establish suitable therapeutic plans is available for green sea turtles. therefore, the present study aimed to describe the pharmacokinetic characteristics of ceftriaxone ... | 2019 | 30307622 |
| a matter of taste: spatial and ontogenetic variations on the trophic ecology of the tiger shark at the galapagos marine reserve. | sharks are top predators across ocean food webs and have a major ecological role in marine ecosystems. investigating the trophic ecology of this group of species is thus essential to understand ecosystem functioning and inform specific management actions aimed at shark conservation. the galapagos islands represent one of the last ocean wildernesses, where populations of sharks and other top marine predators come close to a pristine status. here we provide the first study on the trophic ecology o ... | 2019 | 31539419 |