| cold-induced neurogenic vasodilatation in skin of the giant fulmar macronectes giganteus. | | 1974 | 4440767 |
| seasonal patterns of prolactin and corticosterone secretion in an antarctic seabird that moults during reproduction. | in avian species that have evolved life-history strategies wherein molt and breeding overlap, there are potential conflicts between the regulatory roles of baseline prolactin and corticosterone in parental care (positive) and moult (negative). we describe seasonal patterns of hormonal secretion, moult, and parental behaviour in sibling species of giant petrels (macronectes spp.) which begin moult during the incubation/early chick-rearing stage of reproduction. with the exception of male southern ... | 2012 | 22020257 |
| southern giant petrel macronectes giganteus nest attendance patterns under extreme weather conditions. | differences in nest attendance between genders in seabirds may be related to morphological differences. southern giant petrel is a dimorphic species with gender-specific foraging behavior. the objective of this study was to investigate sex-related differences in nest attendance during the breeding period of southern giant petrels by presence/absence patterns of both sexes during incubation and compare use of the colony after nest failure. fourteen birds were tagged with digitally coded radio-tra ... | 2014 | 25088590 |
| hybridization and back-crossing in giant petrels (macronectes giganteus and m. halli) at bird island, south georgia, and a summary of hybridization in seabirds. | hybridization in natural populations provides an opportunity to study the evolutionary processes that shape divergence and genetic isolation of species. the emergence of pre-mating barriers is often the precursor to complete reproductive isolation. however, in recently diverged species, pre-mating barriers may be incomplete, leading to hybridization between seemingly distinct taxa. here we report results of a long-term study at bird island, south georgia, of the extent of hybridization, mate fid ... | 2015 | 25815478 |
| latitudinal exposure to ddts, hcb, pcbs, pbdes and dp in giant petrels (macronectes spp.) across the southern ocean. | studies on persistent organic pollutants (pops) in antarctic wildlife are scarce, and usually limited to a single locality. as a result, wildlife exposure to pops across the southern ocean is poorly understood. in this study, we report the differential exposure of the major southern ocean scavengers, the giant petrels, to pops across a wide latitudinal gradient. selected pops (pcbs, hcb, ddts, pbdes) and related compounds, such as dechlorane plus (dp), were analyzed in plasma of southern giant p ... | 2016 | 27088732 |
| avian cholera in a southern giant petrel (macronectes giganteus) from antarctica. | a southern giant petrel (macronectes giganteus) was found dead at potter peninsula, king george island, south shetland, antarctica. the adult male was discovered approximately 48 hr after death. macroscopic and microscopic lesions were compatible with avian cholera and the bacterium pasteurella multocida subsp. gallicida, serotype a1 was isolated from lung, heart, liver, pericardial sac, and air sacs. in addition, escherichia coli was isolated from pericardial sac and air sacs. this is the first ... | 2003 | 14567240 |
| hematology, plasma biochemistry, and serosurvey for selected infectious agents in southern giant petrels from patagonia, argentina. | in conjunction with reproductive and feeding ecology studies on southern giant petrels (sgp, macronectes giganteus) blood samples were collected for baseline health evaluations. twenty-five adult sgp from a breeding colony in chubut, argentina, were sampled during two consecutive breeding seasons, 1999-2000 (n = 15) and 2000-01 (n = 10). values for hematology, plasma biochemistry, and minerals are described for 20 birds in apparent good physical condition. a serologic survey of exposure to selec ... | 2003 | 12910764 |
| anthropogenic radionuclides in antarctic biota - dosimetrical considerations. | the article presents results of the research on artificial radionuclides (137cs, 90sr, 241am) in the antarctic environment. samples of 12 species from the marine environment: pygoscelis adeliae, pygoscelis papua, macronectes giganteus, pagodroma nivea, catharacta antarctica, leptonychotes weddellii, mirounga leonina, harpagifer antarcticus, chaenocephalus aceratus, nacella concinna, himantothallus grandifolius, iridaea cordata (bones, feathers, soft tissues, eggs' shells of birds, bones, skin, f ... | 2020 | 31983449 |
| acuariidae (nematoda) in procellariiformes (aves) on the southern coast of rio grande do sul, brazil. | acuariidae nematodes are normally found in the digestive tract of aquatic birds, including procellariiformes. were examined calonectris borealis (n = 4), diomedea exulans (n = 1), macronectes giganteus (n = 8), thalassarche chlororhynchos (n = 5), thalassarche melanophrys (n = 15), procellaria aequinoctialis (n = 4), puffinus gravis (n = 2) and puffinus puffinus (n = 6), collected on the southern coast of rs, brazil. a total of 16 birds (35.5%) were parasitized by two species of acuariidae. steg ... | 2019 | 29513781 |
| persistent organic pollutants in blood samples of southern giant petrels (macronectes giganteus) from the south shetland islands, antarctica. | seabirds play an important role as top consumers in the food web and can be used as biomonitors of exposure to pollutants. contamination studies involving non-destructive sampling methods are of considerable importance, allowing better evaluation of the levels of pollutants and their toxic effects. in the present study, organohalogen contaminants were analyzed in 113 blood samples from southern giant petrel (macronectes giganteus) adults and chicks collected in the austral summer of 2011/2012 an ... | 2016 | 27235927 |
| injuries to avian researchers at palmer station, antarctica from penguins, giant petrels, and skuas. | this paper describes 5 cases of injury to seabird researchers between 1996 and 1999 at palmer station, antarctica. the injuries were inflicted by 3 seabird species: the adelie penguin (pygoscelis adeliae); the southern giant petrel (macronectes giganteus); and the brown skua (catharacta lonnbergi). all injured parties were biologic researchers with previous field experience working under national science foundation research grants; all sought medical evaluation and treatment voluntarily. the nat ... | 2000 | 10921359 |
| cestodes of the genus tetrabothrius (tetrabothridea: tetrabothriidae) from antarctic flying seabirds | four species of the genus tetrabothrius were reported from three species of antarctic flying seabirds. there were: tetrabothrius (culmenamniculus) gracilis nybelin, 1916 and tetrabothrius (oriana) minutus szpotańska, 1917 from macronectes giganteus (gmelin, 1789); tetrabothrius (oriana) filiformis nybelin, 1916 from larus dominicanus lichtenstein, 1823 and tetrabothrius (culmenamniculus) cylindraceus rudolphi, 1849 from stercorarius antarcticus lonnbergi (mathews, 1912). m. giganteus is a new ho ... | 2019 | 32191991 |
| sex-specific effects of fisheries and climate on the demography of sexually dimorphic seabirds. | many animal taxa exhibit sex-specific variation in ecological traits, such as foraging and distribution. these differences could result in sex-specific responses to change, but such demographic effects are poorly understood. here, we test for sex-specific differences in the demography of northern (ngp, macronectes halli) and southern (sgp, m. giganteus) giant petrels - strongly sexually size-dimorphic birds that breed sympatrically at south georgia, south atlantic ocean. both species feed at sea ... | 2019 | 31187479 |
| protein deimination and extracellular vesicle profiles in antarctic seabirds. | pelagic seabirds are amongst the most threatened of all avian groups. they face a range of immunological challenges which seem destined to increase due to environmental changes in their breeding and foraging habitats, affecting prey resources and exposure to pollution and pathogens. therefore, the identification of biomarkers for the assessment of their health status is of considerable importance. peptidylarginine deiminases (pads) post-translationally convert arginine into citrulline in target ... | 2020 | 31936359 |
| pathogenic potential of environmental resident fungi from ornithogenic soils of antarctica. | we assessed the diversity of cultivable fungi in the ornithogenic soil nests of bird species like phalacrocorax atriceps, macronectes giganteus, pygoscelis antarcticus, and pygoscelis papua in the antarctic islands. from 481 fungi isolated at 15 °c, only 50 displayed growth at 37 °c, and were identified as 14 species of 15 genera. aspergillus fumigatus, penicillium chrysogenum, and rhodotorula mucilaginosa were the most abundant species obtained. fifty taxa grew at 40 °c; displayed haemolytic an ... | 2017 | 29122179 |
| feather mercury concentrations in southern ocean seabirds: variation by species, site and time. | we studied mercury contamination in 25 seabird species breeding along a latitudinal gradient across the southern ocean, from gough island (40°s) through marion island (47°s) to byers peninsula (63°s). total mercury concentrations in body feather samples of adults caught at breeding colonies from 2008 to 2011 were determined. krill (euphausia spp.) and other zooplankton consumers had low mercury concentrations (gentoo penguin pygoscelis papua, chinstrap penguin pseudomonas antarctica, common divi ... | 2016 | 27267741 |