| heavy metals and selenium in grebe eggs from agassiz national wildlife refuge in northern minnesota. | metal levels in eggs can often be used as an indicator of exposure and of potential effects. in previous work at agassiz national wildlife refuge, northwestern minnesota, the levels of several heavy metals were shown to be significantly higher in the eggs of eared grebes (podiceps nigricollis) compared to those in the eggs of franklin's gulls (larus pipixcan), black-crowned night-herons (nycticorax nycticorax) and double-crested cormorants (phalacrocorax auritus, except for mercury). in the pres ... | 2005 | 16418918 |
| heavy metals and selenium in grebe feathers from agassiz national wildlife refuge in northern minnesota. | metal levels in feathers can often be used as an indicator of exposure and of potential effects in birds. in previous work at agassiz national wildlife refuge, northwestern minnesota, pied-billed grebe (podilymbus podiceps) eggs had significantly higher levels of manganese and mercury and significantly lower levels of selenium than eared (podiceps nigricollis) or red-necked grebes (podiceps grisegena), but in 1999, pied-billed grebes had significantly higher levels of mercury, but lower levels o ... | 2007 | 17657451 |
| organochlorine contaminants and eggshell thinning in grebes from prairie canada. | eggs of five species of grebe were collected from manitoba, saskatchewan and alberta during 1982-1987: red-necked (podiceps grisegena), horned (p. auritus), eared (p. caspicus), western (aechmophorus occidentalis) and pied-billed (podilymbus podiceps). dde and pcbs were present in all samples analyzed, whereas dieldrin, mirex and oxychlordane were occasionally present at low levels. mercury was present at low levels in all samples for which it was analyzed. red-necked grebes nesting in manitoba ... | 1994 | 15091684 |
| functional relationships and microhabitat distributions of enteric helminths of grebes (podicipedidae): the evidence for interactive communities. | the significance of interspecific interactions as a structuring force in the enteric helminth communities of 4 species of grebes (aechmophorus occidentalis, podiceps grisegena, p. nigricollis, and p. auritus) was evaluated. patterns of microhabitat distribution revealed that helminths resided in predictable locations along the length of the small intestine. individual species of helminths occupied a high proportion of the intestine and varied in position in different host species suggesting a br ... | 1988 | 3357112 |
| consequences of the size structure of fish populations for their effects on a generalist avian predator. | size-structured interspecific interactions can shift between predation and competition, depending on ontogenetic changes in size relationships. i examined the effects of common carp (cyprinus carpio), an omnivorous fish, on the reproductive success of the red-necked grebe (podiceps grisegena), an avian gape-limited predator, along a fish size gradient created by stocking distinct age-cohorts in seminatural ponds. young-of-the-year (0+) carp were an essential food source for young grebes. only ad ... | 2011 | 21153742 |
| isolation of type a influenza viruses from red-necked grebes (podiceps grisegena). | six type-a low pathogenic influenza viruses from 14 red-necked grebes (podiceps grisegena) from agassiz national wildlife refuge were sequenced. the grebe viruses were closely related to north american duck viruses. the genetic and temporal subtype consistency between the duck and grebe isolates suggest spillover events, potentially enhanced by feather eating. | 2015 | 25380358 |
| inorganic contaminants, nutrient reserves and molt intensity in autumn migrant red-necked grebes (podiceps grisegena) at georgian bay. | red-necked grebes (podiceps grisegena) are piscivorous waterbirds that breed on freshwater lakes in northwestern canada and stop-over at the great lakes during autumn migration to molt feathers and replenish lipid and protein reserves. the objectives of this study were to (1) describe concentrations of, and correlations among, inorganic contaminants in a sample of autumn migrant red-necked grebes from the great lakes, (2) compare concentrations of inorganic contaminants to those in autumn migran ... | 2015 | 26250452 |
| a novel strategy to escape a poor habitat: red-necked grebes transfer flightless young to other ponds. | animals confronted with the threat of the death of their offspring may exhibit unusual and risk-prone behaviours. grebes (podicipediformes) are water birds which cannot effectively walk, thus unfledged young are assumed to be unable to depart from their natal ponds by land. we provide evidence that red-necked grebes podiceps grisegena, breeding on ponds with scarce food resources, transferred their flightless young (2-4 weeks old) to other, unconnected ponds by land or air. although a large prop ... | 2017 | 28553009 |
| characterization of microsatellite loci for red-necked grebes podiceps grisegena. | | 1999 | 10327663 |