Publications
| Title | Abstract | Year Filter | PMID(sorted descending) Filter |
|---|
| salmonella in black-headed gulls ( larus ridibundus); prevalence, genotypes and influence on salmonella epidemiology. | during a period of 3 years, 1998-2000, 1047 faecal swabs from black-headed gulls were sampled at one location in southern sweden. salmonella spp. was found in 28 individuals (2.7%) and the dominating serotype found was s. typhimurium (83%). twenty-five per cent of the salmonella-infected gulls were later recaptured and re-sampled. we found that salmonella infection in black-headed gulls was of short duration, and that infection in this bird species was predominantly expressed as carriage without ... | 2006 | 16238820 |
| prenatal androgen exposure modulates cellular and humoral immune function of black-headed gull chicks. | avian eggs contain considerable amounts of maternal yolk androgens, which have been shown to beneficially influence the physiology and behaviour of the chick. as androgens may suppress immune functions, they may also entail costs for the chick. this is particularly relevant for colonial species, such as the black-headed gull (larus ridibundus), in which the aggregation of large numbers of birds during the breeding season enhances the risk of infectious diseases for the hatching chick. to test th ... | 2005 | 16191605 |
| prenatal androgen exposure modulates cellular and humoral immune function of black-headed gull chicks. | avian eggs contain considerable amounts of maternal yolk androgens, which have been shown to beneficially influence the physiology and behaviour of the chick. as androgens may suppress immune functions, they may also entail costs for the chick. this is particularly relevant for colonial species, such as the black-headed gull (larus ridibundus), in which the aggregation of large numbers of birds during the breeding season enhances the risk of infectious diseases for the hatching chick. to test th ... | 2005 | 16191605 |
| the hormonal control of begging and early aggressive behavior: experiments in black-headed gull chicks. | the hormonal control of begging and sibling competition is largely unknown, but recent evidence suggests a role for steroid hormones. we tested the influence of the aromatizable androgen testosterone (t), the non-aromatizable androgen 5alpha-dihydrotestosterone (dht), and 17beta-estradiol (e) on both begging behavior and aggressive behavior in black-headed gull chicks (larus ridibundus). chicks of this species have a conspicuous begging display, while their frequently performed early aggressive ... | 2005 | 15878577 |
| the hormonal control of begging and early aggressive behavior: experiments in black-headed gull chicks. | the hormonal control of begging and sibling competition is largely unknown, but recent evidence suggests a role for steroid hormones. we tested the influence of the aromatizable androgen testosterone (t), the non-aromatizable androgen 5alpha-dihydrotestosterone (dht), and 17beta-estradiol (e) on both begging behavior and aggressive behavior in black-headed gull chicks (larus ridibundus). chicks of this species have a conspicuous begging display, while their frequently performed early aggressive ... | 2005 | 15878577 |
| within clutch co-variation of egg mass and sex in the black-headed gull. | female birds of several species have control over the production of daughters and sons. however, most studies failed to find a relationship between egg size and sex. this is intriguing as adjustment of egg size would constitute a powerful tool for the female to meet different resource demands of the sexes, particularly in size dimorphic species. our results show that, within clutches of black-headed gulls (larus ridibundus) the proportion of males was positively associated with egg mass. this ap ... | 2005 | 15842495 |
| within clutch co-variation of egg mass and sex in the black-headed gull. | female birds of several species have control over the production of daughters and sons. however, most studies failed to find a relationship between egg size and sex. this is intriguing as adjustment of egg size would constitute a powerful tool for the female to meet different resource demands of the sexes, particularly in size dimorphic species. our results show that, within clutches of black-headed gulls (larus ridibundus) the proportion of males was positively associated with egg mass. this ap ... | 2005 | 15842495 |
| characterization of a novel influenza a virus hemagglutinin subtype (h16) obtained from black-headed gulls. | in wild aquatic birds and poultry around the world, influenza a viruses carrying 15 antigenic subtypes of hemagglutinin (ha) and 9 antigenic subtypes of neuraminidase (na) have been described. here we describe a previously unidentified antigenic subtype of ha (h16), detected in viruses circulating in black-headed gulls in sweden. in agreement with established criteria for the definition of antigenic subtypes, hemagglutination inhibition assays and immunodiffusion assays failed to detect specific ... | 2005 | 15709000 |
| investigation of outbreaks of highly pathogenic h5n1 avian influenza in waterfowl and wild birds in hong kong in late 2002. | outbreaks of highly pathogenic h5n1 avian influenza have occurred in hong kong in chickens and other gallinaceous poultry in 1997, 2001, twice in 2002 and 2003. high mortality rates were seen in gallinaceous birds but not in domestic or wild waterfowl or other wild birds until late 2002 when highly pathogenic h5n1 avian influenza occurred in waterfowl (geese, ducks and swans), captive greater flamingo (phoenicopterus ruber) and other wild birds (little egret egretta garzetta) at two waterfowl pa ... | 2004 | 15545029 |
| investigation of outbreaks of highly pathogenic h5n1 avian influenza in waterfowl and wild birds in hong kong in late 2002. | outbreaks of highly pathogenic h5n1 avian influenza have occurred in hong kong in chickens and other gallinaceous poultry in 1997, 2001, twice in 2002 and 2003. high mortality rates were seen in gallinaceous birds but not in domestic or wild waterfowl or other wild birds until late 2002 when highly pathogenic h5n1 avian influenza occurred in waterfowl (geese, ducks and swans), captive greater flamingo (phoenicopterus ruber) and other wild birds (little egret egretta garzetta) at two waterfowl pa ... | 2004 | 15545029 |
| influence of a mine tailing accident near doñana national park (spain) on heavy metals and arsenic accumulation in 14 species of waterfowl (1998 to 2000). | this article presents the impact on waterbirds in doñana national park (spain) of an accidental release of 5 million m3 acid waste produced by the processing of pyrite ore. heavy metals (zinc, copper, cadmium, and lead) and arsenic were measured in several soft tissues (liver, kidney, and muscle) taken from 14 waterfowl species collected between april 1998 and may 2000. the main source of copper and zinc found in the waterfowl species examined was the spill waste, whereas cadmium, lead, and arse ... | 2004 | 15499503 |
| influence of a mine tailing accident near doñana national park (spain) on heavy metals and arsenic accumulation in 14 species of waterfowl (1998 to 2000). | this article presents the impact on waterbirds in doñana national park (spain) of an accidental release of 5 million m3 acid waste produced by the processing of pyrite ore. heavy metals (zinc, copper, cadmium, and lead) and arsenic were measured in several soft tissues (liver, kidney, and muscle) taken from 14 waterfowl species collected between april 1998 and may 2000. the main source of copper and zinc found in the waterfowl species examined was the spill waste, whereas cadmium, lead, and arse ... | 2004 | 15499503 |
| kinematic parameters of the walking of herons, ground-feeders, and waterfowl. | the kinematic gait characteristics of six species of birds in three groups were compared. the groups studied were herons (gray herons and little egrets), ground-feeders (domestic pigeons and gray starlings), and waterfowl (pintails and black-headed gulls). the results showed that the relative stride frequency was greater in the waterfowl than in the other species. complementary to this, the amplitude of the movements was smaller in the waterfowl than in the others. these differences between the ... | 2004 | 15471689 |
| european starling chicks benefit from high yolk testosterone levels during a drought year. | avian egg yolk contains androgenic hormones, such as testosterone, of maternal origin. experimental elevation of yolk testosterone levels enhances growth of canary chicks. success in sibling competition, due to increased begging, is presumed to underlie this growth enhancement, because canary hatchlings from testosterone-treated eggs beg longer in response to vibrational stimuli than controls. furthermore, experimental elevation of both yolk androstenedione and testosterone increased chick growt ... | 2004 | 15256308 |
| parent-offspring conflict and the coordination of siblings in gulls. | offspring solicit food from their parents by begging behaviours. studies on birds suggest that these displays are 'honest signals of need' and adults provide food according to the begging level. however, siblings may compete for parental resources and the begging intensity is expected to change with brood size. here, we show that in the black-headed gull (larus ridibundus) an increase of the numbers of siblings can result in a decrease of individual begging cost through nestlings' synchronized s ... | 2004 | 15252967 |
| parent-offspring conflict and the coordination of siblings in gulls. | offspring solicit food from their parents by begging behaviours. studies on birds suggest that these displays are 'honest signals of need' and adults provide food according to the begging level. however, siblings may compete for parental resources and the begging intensity is expected to change with brood size. here, we show that in the black-headed gull (larus ridibundus) an increase of the numbers of siblings can result in a decrease of individual begging cost through nestlings' synchronized s ... | 2004 | 15252967 |
| radionuclides and the birds at ravenglass. | since 1983, concern has been expressed about the apparent decline in numbers of birds in the ravenglass estuary in west cumbria, particularly of the black-headed gull colony on the drigg dunes, and suggestions have been made that this decline might be due to excessive radiation in the birds' food and their general environment. twelve species of marine invertebrates from ravenglass, most of them known to be important foods for birds, were analysed, and further samples were taken from sites along ... | 1991 | 15092143 |
| residues of chlorinated pesticides in the eggs of karelian birds, 1989-90. | eggs (n = 52) of four aquatic bird species (larus canus, larus argentatus, larus ridibundus, sterna hirundo) and crow (corvus cornix), collected in southern karelia in 1989 and 1990, contained dde and lindane. the highest mean levels of these pollutants were in herring gull eggs and in common tern eggs. the lowest mean levels of pesticides were in crow eggs. in all eggs, dde concentrations were lower than the critical threshold and it seems, cannot influence reproductive success. | 1995 | 15091609 |
| residues of chlorinated pesticides in the eggs of karelian birds, 1989-90. | eggs (n = 52) of four aquatic bird species (larus canus, larus argentatus, larus ridibundus, sterna hirundo) and crow (corvus cornix), collected in southern karelia in 1989 and 1990, contained dde and lindane. the highest mean levels of these pollutants were in herring gull eggs and in common tern eggs. the lowest mean levels of pesticides were in crow eggs. in all eggs, dde concentrations were lower than the critical threshold and it seems, cannot influence reproductive success. | 1995 | 15091609 |
| interspecies differences in mixed function oxidase activity in birds: relationship between feeding habits, detoxication activities and organochlorine accumulation. | the relationship between feeding habits and interspecies differences in the detoxication ability of the mixed function oxidase (mfo) system was investigated in birds. the role of mfo (particularly aldrin epoxidase activity) in the detoxication/bioaccumulation of organochlorines was also investigated. euriphagic (yellow-legged herring gull (larus cachinnans), black-headed gull (larus ridibundus), jackdaw (corvus monedula), magpie (pica pica) and stenophagic (cormorant (phalacrocorax carbo), coot ... | 1995 | 15091496 |
| interspecies differences in mixed function oxidase activity in birds: relationship between feeding habits, detoxication activities and organochlorine accumulation. | the relationship between feeding habits and interspecies differences in the detoxication ability of the mixed function oxidase (mfo) system was investigated in birds. the role of mfo (particularly aldrin epoxidase activity) in the detoxication/bioaccumulation of organochlorines was also investigated. euriphagic (yellow-legged herring gull (larus cachinnans), black-headed gull (larus ridibundus), jackdaw (corvus monedula), magpie (pica pica) and stenophagic (cormorant (phalacrocorax carbo), coot ... | 1995 | 15091496 |
| [observations on the development of the hypophysis in the black-headed gull]. | 1951 | 14826990 | |
| persistent organochlorine pollutants in liver of birds of different trophic levels from coastal areas of campania, italy. | liver samples of 12 species of birds of different trophic levels, collected during the period 1998-2000 from coastal areas of the campania region, southern italy, were analyzed for organochlorine pesticides (ocs), such as dichlorodiphenyltrichloroethane (ddt) and its metabolites, hexachlorobenzene (hcb), gamma-hexachlorocycloexane (gamma-hch), aldrin, dieldrin, endrin, and the seven pcb "target" congeners, iupac nos. 28, 52, 101, 118, 138, 153 and 180. p,p'-dde was present in all the samples ana ... | 2003 | 14674594 |
| persistent organochlorine pollutants in liver of birds of different trophic levels from coastal areas of campania, italy. | liver samples of 12 species of birds of different trophic levels, collected during the period 1998-2000 from coastal areas of the campania region, southern italy, were analyzed for organochlorine pesticides (ocs), such as dichlorodiphenyltrichloroethane (ddt) and its metabolites, hexachlorobenzene (hcb), gamma-hexachlorocycloexane (gamma-hch), aldrin, dieldrin, endrin, and the seven pcb "target" congeners, iupac nos. 28, 52, 101, 118, 138, 153 and 180. p,p'-dde was present in all the samples ana ... | 2003 | 14674594 |
| lymphoid distribution in the migratory gull larus ridibundus. | we studied the distribution of lymphocytes in the main lymphoid tissues (blood, spleen and thymus) of the gull larus ridibundus, searching for variations that might depend on the migratory cycle. we also looked for sex- and age-associated differences in lymphoid redistribution. in l. ridibundus, lymphocytes are the most commonly observed leukocyte subpopulation in blood. moreover, changes in the distribution of lymphocytes in the lymphoid tissue occur, depending on the migratory period. the prop ... | 2003 | 14613802 |
| [the organic nucleus of the mammilla in the early stages of formation of the eggshell of larus ridibundus]. | 1965 | 14268261 | |
| [comparative helminthological studies on the argentine gulls larus marinus dominicanus lichtenstein and larus ridibundus maculipennis lichtenstein with new observations on the species specificity of the parasites]. | 1964 | 14251217 | |
| [contribution to the topochemistry of carbohydrates in embryonal kidneys in the laughing gull (larus ridibundus l.)]. | 1959 | 13669952 | |
| the incidence of ornithosis and salmonellosis in the black-headed gull (larus ridibundus l.). ii. isolation and identification of the virus of ornithosis from the black-headed gull with simultaneous isolation of s. typhi murium. | 1957 | 13502550 | |
| the incidence of ornithosis and salmonellosis in the black-headed gull (larus ridibundus l.). ii. isolation and identification of the virus of ornithosis from the black-headed gull with simultaneous isolation of s. typhi murium. | 1957 | 13502550 | |
| the incidence of ornithosis and salmonellosis in the black-headed gull (larus ridibundus l.). | 1957 | 13475800 | |
| the incidence of ornithosis and salmonellosis in the black-headed gull (larus ridibundus l.). | 1957 | 13475800 | |
| [ornithosis and salmonella infections in larus ridibundus l. ii. isolation and identification of ornithosis virus in gull with simultaneous detection of salmonella typhimurium]. | 1957 | 13472744 | |
| [ornithosis and salmonella infections in larus ridibundus l. ii. isolation and identification of ornithosis virus in gull with simultaneous detection of salmonella typhimurium]. | 1957 | 13472744 | |
| [incidence of ornithosis and salmonellosis in the black-headed gull (larus ridibundus l.). i. epidemiological investigations]. | 1957 | 13437333 | |
| [incidence of ornithosis and salmonellosis in the black-headed gull (larus ridibundus l.). i. epidemiological investigations]. | 1957 | 13437333 | |
| steroids for free? no metabolic costs of elevated maternal androgen levels in the black-headed gull. | within- and between-clutch variation in yolk titres of hormones of maternal origin has been found in many avian species. so far, experiments have revealed mainly beneficial effects of maternal androgens. this would also apply to black-headed gulls (larus ridibundus). previous experiments have shown that chicks benefit from these higher levels since their competitive abilities are improved and growth and survival probabilities thus enhanced. however, not all females show the same increase in yolk ... | 2003 | 12909702 |
| steroids for free? no metabolic costs of elevated maternal androgen levels in the black-headed gull. | within- and between-clutch variation in yolk titres of hormones of maternal origin has been found in many avian species. so far, experiments have revealed mainly beneficial effects of maternal androgens. this would also apply to black-headed gulls (larus ridibundus). previous experiments have shown that chicks benefit from these higher levels since their competitive abilities are improved and growth and survival probabilities thus enhanced. however, not all females show the same increase in yolk ... | 2003 | 12909702 |
| spontaneous and benzo[a]pyrene-induced micronuclei in the embryos of the black-headed gull (larus ridibundus l.). | the spontaneous levels of micronuclei in erythrocytes were established in embryos of the black-headed gull of two natural populations. in total 216 blood samples from the same number of individuals were examined. a statistically significant decrease in the number of spontaneous micronucleated erythrocytes was found after 13 days of incubation. we found no statistically significant difference in the spontaneous frequencies of micronucleated erythrocytes in the embryos of the two colonies studied, ... | 2003 | 12834752 |
| spontaneous and benzo[a]pyrene-induced micronuclei in the embryos of the black-headed gull (larus ridibundus l.). | the spontaneous levels of micronuclei in erythrocytes were established in embryos of the black-headed gull of two natural populations. in total 216 blood samples from the same number of individuals were examined. a statistically significant decrease in the number of spontaneous micronucleated erythrocytes was found after 13 days of incubation. we found no statistically significant difference in the spontaneous frequencies of micronucleated erythrocytes in the embryos of the two colonies studied, ... | 2003 | 12834752 |
| potential for individual recognition in acoustic signals: a comparative study of two gulls with different nesting patterns. | we test relationships between structure of acoustic signal used for individual recognition and nesting ecology among two gulls: the black-headed gull (larus ridibundus), in which chicks remain in the nest, and the slender-billed gull (l. genei), in which chicks leave the nest after hatching to form crèches. a striking difference between both species is the presence of two fundamental frequencies in the slender-billed gull's call and only one in the black-headed gull's call. our study shows that ... | 2003 | 12806840 |
| potential for individual recognition in acoustic signals: a comparative study of two gulls with different nesting patterns. | we test relationships between structure of acoustic signal used for individual recognition and nesting ecology among two gulls: the black-headed gull (larus ridibundus), in which chicks remain in the nest, and the slender-billed gull (l. genei), in which chicks leave the nest after hatching to form crèches. a striking difference between both species is the presence of two fundamental frequencies in the slender-billed gull's call and only one in the black-headed gull's call. our study shows that ... | 2003 | 12806840 |
| effect of migratory cycle and 17beta-estradiol on splenic leukocyte functions in female black-headed gulls. | the immune function of wild birds is practically unknown. we have studied several functions of splenic leukocytes from the gull larus ridibundus. considering that avian physiology is strikingly affected by the seasonal migratory cycle, those functions were analyzed throughout the seasonal cycle. the functions assayed were: adherence to substrate, chemotaxis and lymphoproliferative response to mitogens. estrogens have been reported to modulate the immune response in mammals; therefore serum level ... | 2003 | 12632185 |
| occurrence of intermediate hosts and structure of digenean communities of the black-headed gull, larus ridibundus (l.). | the factors contributing to the similarity between digenean parasite assemblages parasitizing the black-headed gull were investigated. thirteen different digenean species from the digestive tract and the bursa of fabricus were found. we predicted that the structure of parasite communities is not random at either component community or infracommunity levels. we searched for nested patterns in the digenean community, and explored the possible factors contributing to nestedness. we found that digen ... | 2003 | 12613765 |
| occurrence of intermediate hosts and structure of digenean communities of the black-headed gull, larus ridibundus (l.). | the factors contributing to the similarity between digenean parasite assemblages parasitizing the black-headed gull were investigated. thirteen different digenean species from the digestive tract and the bursa of fabricus were found. we predicted that the structure of parasite communities is not random at either component community or infracommunity levels. we searched for nested patterns in the digenean community, and explored the possible factors contributing to nestedness. we found that digen ... | 2003 | 12613765 |
| campylobacter jejuni in black-headed gulls (larus ridibundus): prevalence, genotypes, and influence on c. jejuni epidemiology. | campylobacteriosis is a zoonotic disease in which birds have been suggested to play an important role as a reservoir. we investigated the prevalence of campylobacter jejuni subsp. jejuni in black-headed gulls (larus ridibundus) in southern sweden with the aim of examining the nature of c. jejuni infection in this bird species. birds were sampled in four sampling series each year during 1999 (n = 419) and 2000 (n = 365). longitudinally sampled c. jejuni isolates from individual gulls were subject ... | 2002 | 12454158 |
| campylobacter jejuni in black-headed gulls (larus ridibundus): prevalence, genotypes, and influence on c. jejuni epidemiology. | campylobacteriosis is a zoonotic disease in which birds have been suggested to play an important role as a reservoir. we investigated the prevalence of campylobacter jejuni subsp. jejuni in black-headed gulls (larus ridibundus) in southern sweden with the aim of examining the nature of c. jejuni infection in this bird species. birds were sampled in four sampling series each year during 1999 (n = 419) and 2000 (n = 365). longitudinally sampled c. jejuni isolates from individual gulls were subject ... | 2002 | 12454158 |
| china's war on waste and pollution. | the water level of one of the longest rivers in the world, the yangtze in china, fell 20 cm below sea level in february 1993 at shashi in hubei province, the lowest water level in 20 years. in 1993, black-headed gulls left for their annual migration 3 months early because the deteriorating water environment in dianchi lake in kunming, yunnan province, could not support them. china's total surface run-off is among the world's top 5. yet it suffers a water deficit due to its large population size ... | 1993 | 12287012 |
| social stimuli, testosterone, and aggression in gull chicks: support for the challenge hypothesis. | we tested the challenge hypothesis for the hormonal regulation of aggression in chicks of the black-headed gull, larus ridibundus. chicks of this species are highly aggressive toward conspecifics, but never to peers that hatched from the same clutch (modal clutch size is three). therefore, in the first experiment small families were housed together in large groups (challenged condition) and compared to families kept isolated (nonchallenged condition). as expected, in the challenged condition dur ... | 2002 | 11971668 |
| social stimuli, testosterone, and aggression in gull chicks: support for the challenge hypothesis. | we tested the challenge hypothesis for the hormonal regulation of aggression in chicks of the black-headed gull, larus ridibundus. chicks of this species are highly aggressive toward conspecifics, but never to peers that hatched from the same clutch (modal clutch size is three). therefore, in the first experiment small families were housed together in large groups (challenged condition) and compared to families kept isolated (nonchallenged condition). as expected, in the challenged condition dur ... | 2002 | 11971668 |
| accumulation profiles of persistent organochlorines in waterbirds from an estuary in korea. | persistent organochlorine pollutants (pops), such as polychlorinated dibenzo-p-dioxins (pcdds), polychlorinated dibenzofurans (pcdfs), polychlorinated biphenyls (pcbs), and organochlorine (oc) pesticides such as ddts (dichlorodiphenyltrichloroethane), hchs (hexachlorocyclohexane isomers), chls (chlordane compounds) and hcb (hexachlorobenzene), were measured in subcutaneous fat of resident and migratory birds collected from the nakdong river estuary (nre) in korea. black-tailed gull, a resident b ... | 2001 | 11503073 |
| maternal androgens in black-headed gull (larus ridibundus) eggs: consequences for chick development. | we tested the hypothesis that mother birds counterbalance the negative effects of hatching asynchrony for later-hatched chicks by increasing the yolk androgen concentrations in consecutive eggs of their clutch. in doing so, they may adaptively tune each offspring's competitive ability and, thus, growth and survival. however, evidence in support of this hypothesis is contradictory. the yolk concentrations of maternal androgens in the eggs of black-headed gulls increase significantly with the layi ... | 2001 | 11345330 |
| maternal androgens in black-headed gull (larus ridibundus) eggs: consequences for chick development. | we tested the hypothesis that mother birds counterbalance the negative effects of hatching asynchrony for later-hatched chicks by increasing the yolk androgen concentrations in consecutive eggs of their clutch. in doing so, they may adaptively tune each offspring's competitive ability and, thus, growth and survival. however, evidence in support of this hypothesis is contradictory. the yolk concentrations of maternal androgens in the eggs of black-headed gulls increase significantly with the layi ... | 2001 | 11345330 |
| [the development of the genital system in ichthyocotylurus variegatus (trematoda: strigeidae)]. | the development of ichthyocotylurus variegatus from metacercariae to ovigerous adults in the natural definitive host (larus ridibundus) was examined at 24 h intervals. the metacercariae develop to the adults through a somatic growth of hindbody; the gametogeny and vitellogenesis take 4-6 days. during the first day of development the pair of testes are separated from the genital anlage. the ovary differentiates one day later. genital ducts are completely differentiated on 4th day after the beginn ... | 2000 | 10862396 |
| [the development of the genital system in ichthyocotylurus variegatus (trematoda: strigeidae)]. | the development of ichthyocotylurus variegatus from metacercariae to ovigerous adults in the natural definitive host (larus ridibundus) was examined at 24 h intervals. the metacercariae develop to the adults through a somatic growth of hindbody; the gametogeny and vitellogenesis take 4-6 days. during the first day of development the pair of testes are separated from the genital anlage. the ovary differentiates one day later. genital ducts are completely differentiated on 4th day after the beginn ... | 2000 | 10862396 |
| keep the chicks moving: how sandwich terns can minimize kleptoparasitism by black-headed gulls. | sandwich terns, sterna sandvicensis, often nest in association with black-headed gulls, larus ridibundus. the gulls provide protection against predators, but can also adversely affect the terns' reproductive success through predation and piracy of fish. to test whether leading the chicks away from the nest site is an evasive strategy used by the parents to reduce the incidence of robbery by the gulls, we kept one group of sandwich tern chicks at their original breeding site, while, with a wire-n ... | 1999 | 10328801 |
| campylobacter spp. and salmonella spp. in black-headed gulls (larus ridibundus). | cloacal examination of 41 juvenile black-headed gulls (larus ridibundus) by cultivation demonstrated campylobacter jejuni in 26 (63%) and salmonella typhimurium in 21 (51%) of them. all the bird samples were collected in a breeding colony near the town hodonin, south moravia, czech republic in 1996. twenty six campylobacter isolates were tested for antibiotic and drug sensitivity: all were resistant to at least three agents (penicillin, tetracyclin and sulfomethoxazol-trimethoprim) while all wer ... | 1997 | 9151001 |
| campylobacter spp. and salmonella spp. in black-headed gulls (larus ridibundus). | cloacal examination of 41 juvenile black-headed gulls (larus ridibundus) by cultivation demonstrated campylobacter jejuni in 26 (63%) and salmonella typhimurium in 21 (51%) of them. all the bird samples were collected in a breeding colony near the town hodonin, south moravia, czech republic in 1996. twenty six campylobacter isolates were tested for antibiotic and drug sensitivity: all were resistant to at least three agents (penicillin, tetracyclin and sulfomethoxazol-trimethoprim) while all wer ... | 1997 | 9151001 |
| demographic models for subdivided populations: the renewal equation approach | le bras (theor. popul. biol. 2, 100-121, 1971) and rogers (demography 11, 473-481, 1974), in two neglected papers, have generalized to the multisite case the euler-lotka renewal equation and demographic characteristics such as age structure and reproductive value. the purpose of this paper is twofold: first, to restate the multisite renewal equation in the matrix context; second, to derive results on age structure, net reproduction rate, generation time, and sensitivities, as generalizations of ... | 1996 | 8813026 |
| demographic models for subdivided populations: the renewal equation approach | le bras (theor. popul. biol. 2, 100-121, 1971) and rogers (demography 11, 473-481, 1974), in two neglected papers, have generalized to the multisite case the euler-lotka renewal equation and demographic characteristics such as age structure and reproductive value. the purpose of this paper is twofold: first, to restate the multisite renewal equation in the matrix context; second, to derive results on age structure, net reproduction rate, generation time, and sensitivities, as generalizations of ... | 1996 | 8813026 |
| [the black-headed gull (larus ridibundus l.), a new host for cryptosporidium baileyi (apicomplexa: cryptosporidiidae)]. | black-headed full (l. ridibundus l.) represents a new host of c. baileyi current, upton and haynes, 1986. in 1991-1992 during the months of may-july six localities in three regions of the czech republic were studied by examining in total 264 not flying gull chicks (4-30 days of age), applying the methods after pavlásek (1987a, b, 1991). cryptosporidia were found in gulls in all localities and spontaneous infection during the period under study occurred in 27.5-100% of birds (tab. ii, fig. 1). th ... | 1993 | 8259642 |
| [the black-headed gull (larus ridibundus l.), a new host for cryptosporidium baileyi (apicomplexa: cryptosporidiidae)]. | black-headed full (l. ridibundus l.) represents a new host of c. baileyi current, upton and haynes, 1986. in 1991-1992 during the months of may-july six localities in three regions of the czech republic were studied by examining in total 264 not flying gull chicks (4-30 days of age), applying the methods after pavlásek (1987a, b, 1991). cryptosporidia were found in gulls in all localities and spontaneous infection during the period under study occurred in 27.5-100% of birds (tab. ii, fig. 1). th ... | 1993 | 8259642 |
| the estimation of age-specific breeding probabilities from recaptures or resightings in vertebrate populations: ii. longitudinal models. | we provide a statistical framework to estimate age-specific breeding probabilities in vertebrate populations, from recaptures or resightings of individuals marked as young. we consider data collected at one or possibly several points over time, when individual recapture histories are known, leading to models which we call longitudinal models. an example of resightings of black-headed gulls, larus ridibundus, is considered. | 1994 | 8068838 |
| differences in mercury contamination and elimination during feather development in gull and tern broods. | eggs, feathers (down, body feathers from side/shoulder and back) and some dead chicks (liver) from broods of three species, herring full (larus argentatus), black-headed gull (larus ridibundus), and common tern (sterna hirundo) from the german north sea coast were collected to study intersibling differences in mercury contamination and elimination into the growing feathers. the mercury contamination in eggs, feathers, and liver of the terns was about four times that of the gulls; black-headed gu ... | 1994 | 8060159 |
| differences in mercury contamination and elimination during feather development in gull and tern broods. | eggs, feathers (down, body feathers from side/shoulder and back) and some dead chicks (liver) from broods of three species, herring full (larus argentatus), black-headed gull (larus ridibundus), and common tern (sterna hirundo) from the german north sea coast were collected to study intersibling differences in mercury contamination and elimination into the growing feathers. the mercury contamination in eggs, feathers, and liver of the terns was about four times that of the gulls; black-headed gu ... | 1994 | 8060159 |
| [epizootiology and pathogenesis of avian mycobacteriosis in the laughing gull (larus ridibundus)]. | the occurrence of avian mycobacteriosis and sensitivity to m. avium were investigated in the laughing gull in this paper. the patho-morphological and culture examination of 35 individuals of the laughing gull caught at four different localities of the czech republic did not reveal any tuberculous lesions nor did it enable to isolate mycobacteria. after experimental intramuscular infection by suspension of m. avium macroscopic tuberculous lesions were found at the spot of puncture in 35 days, in ... | 1994 | 8009783 |
| [epizootiology and pathogenesis of avian mycobacteriosis in the laughing gull (larus ridibundus)]. | the occurrence of avian mycobacteriosis and sensitivity to m. avium were investigated in the laughing gull in this paper. the patho-morphological and culture examination of 35 individuals of the laughing gull caught at four different localities of the czech republic did not reveal any tuberculous lesions nor did it enable to isolate mycobacteria. after experimental intramuscular infection by suspension of m. avium macroscopic tuberculous lesions were found at the spot of puncture in 35 days, in ... | 1994 | 8009783 |
| salmonella contamination of the environment and its incidence in wild birds. | in 1984-1991, the incidence of salmonellas was studied in wild birds from various sites in the czech republic. on an agricultural farm with salmonellosis in calves, salmonellae were isolated from eight birds (seven passer domesticus, one serinus serinus) of 31 birds examined. on various agricultural farms with no salmonellosis in farm animals, salmonellae were found in two birds (columba livia f. domestica) of 2186 birds examined. of 35 birds caught at a municipal waste-dump site, salmonellae we ... | 1994 | 7839754 |
| salmonella contamination of the environment and its incidence in wild birds. | in 1984-1991, the incidence of salmonellas was studied in wild birds from various sites in the czech republic. on an agricultural farm with salmonellosis in calves, salmonellae were isolated from eight birds (seven passer domesticus, one serinus serinus) of 31 birds examined. on various agricultural farms with no salmonellosis in farm animals, salmonellae were found in two birds (columba livia f. domestica) of 2186 birds examined. of 35 birds caught at a municipal waste-dump site, salmonellae we ... | 1994 | 7839754 |
| salmonellae in gulls and other free-living birds in the czech republic. | cloacal swabs, collected from 756 wild synanthropic and exoanthropic birds of 57 species in the czech republic, yielded 32 strains of salmonella typhimurium [phage types (pt) 141, 104 and 41], six isolates of s. enteritidis (pt 8, 4 and 6e), and one each of s. panama and s. anatum. except for one s. enteritidis isolate from a grey-lag goose (anser anser) and one s. typhimurium isolate from a coot (fulica atra), all of the other strains were derived from black-headed gulls (larus ridibundus), of ... | 1995 | 7787820 |
| salmonellae in gulls and other free-living birds in the czech republic. | cloacal swabs, collected from 756 wild synanthropic and exoanthropic birds of 57 species in the czech republic, yielded 32 strains of salmonella typhimurium [phage types (pt) 141, 104 and 41], six isolates of s. enteritidis (pt 8, 4 and 6e), and one each of s. panama and s. anatum. except for one s. enteritidis isolate from a grey-lag goose (anser anser) and one s. typhimurium isolate from a coot (fulica atra), all of the other strains were derived from black-headed gulls (larus ridibundus), of ... | 1995 | 7787820 |
| [characteristics of the plasmid profile of inositol- and rhamnose- negative strains of salmonella typhimurium]. | s. typhimurium isolates obtained during a large outbreak of human salmonellosis associated with smoked mackerels in the czech republic as well as strains of s. typhimurium isolated from black headed gull (larus ridibundus) were examined following biotyping, phage typing, plasmid profiling and restriction endonuclease analysis (eco ri, hind iii and bam hi) of plasmid dna. the epidemic strain of s. typhimurium and two isolates from environment of nesting colony black-headed gull were meso-inositol ... | 1995 | 7716866 |
| [characteristics of the plasmid profile of inositol- and rhamnose- negative strains of salmonella typhimurium]. | s. typhimurium isolates obtained during a large outbreak of human salmonellosis associated with smoked mackerels in the czech republic as well as strains of s. typhimurium isolated from black headed gull (larus ridibundus) were examined following biotyping, phage typing, plasmid profiling and restriction endonuclease analysis (eco ri, hind iii and bam hi) of plasmid dna. the epidemic strain of s. typhimurium and two isolates from environment of nesting colony black-headed gull were meso-inositol ... | 1995 | 7716866 |
| heavy metals in some species of waterfowl of northern italy. | concentrations of heavy metals (zinc, copper, cadmium, and iron) were measured in several tissues (brain, gizzard, leg-muscle, heart, breast-muscle, intestine, liver and kidney) of moorhens (gallinula chloropus), black-headed gulls (larus ridibundus), and coots (fulica atra) collected between autumn 1985 and spring 1989 in northern italy. cadmium concentrations in the liver and kidney of water-rails (rallus aquaticus) and in five species of anatidae collected also were measured. high mean (+/- s ... | 1995 | 7563424 |
| heavy metals in some species of waterfowl of northern italy. | concentrations of heavy metals (zinc, copper, cadmium, and iron) were measured in several tissues (brain, gizzard, leg-muscle, heart, breast-muscle, intestine, liver and kidney) of moorhens (gallinula chloropus), black-headed gulls (larus ridibundus), and coots (fulica atra) collected between autumn 1985 and spring 1989 in northern italy. cadmium concentrations in the liver and kidney of water-rails (rallus aquaticus) and in five species of anatidae collected also were measured. high mean (+/- s ... | 1995 | 7563424 |
| [occurrence of salmonellae in the laughing gull (larus ridibundus)]. | in 1984-1994 black-headed gulls (larus ridibundus) from various localities in the czech republic were examined to assess the incidence of salmonellae. a total of 99 eggs from two nest colonies were examined. no salmonellae were detected. in examinations of 740 young birds from three colonies the total prevalence was 19.3%. in full grown gulls (number of examined birds 189) from five localities the total prevalence of salmonellae was 4.2%. in water specimens near the nest colonies, other habitats ... | 1995 | 7489134 |
| [occurrence of salmonellae in the laughing gull (larus ridibundus)]. | in 1984-1994 black-headed gulls (larus ridibundus) from various localities in the czech republic were examined to assess the incidence of salmonellae. a total of 99 eggs from two nest colonies were examined. no salmonellae were detected. in examinations of 740 young birds from three colonies the total prevalence was 19.3%. in full grown gulls (number of examined birds 189) from five localities the total prevalence of salmonellae was 4.2%. in water specimens near the nest colonies, other habitats ... | 1995 | 7489134 |
| suspected teratoma in a black headed gull (larus ridibundus). | 1981 | 7292926 | |
| suspected teratoma in a black headed gull (larus ridibundus). | 1981 | 7292926 | |
| [hygienic quality of lakes which are used as open-air bath. 2. communication: comparison of biochemical typed escherichia coli strains isolated from lake water and bird excrements (author's transl)]. | 368 strains of escherichia coli were isolated from lakewaters and bird excrements (mainly black-headed gulls) using mandatory methods for drinking water examination. all strains were further characterized by 43 biochemical physiological and 30 morphological features. besides the api 30 e enterobacteriaceae system and the roche enterotube system of biochemical testing were used comparatively. the analysis using numerical methods for taxonomy pointed out that a single biotop could be characterized ... | 1981 | 7029972 |
| a note on salmonella excretion in the black headed gull (larus ribibundus) feeding at sewage treatment works. | the range of salmonella serotypes found in sewage sludge and in the faeces of black headed gulls (larus ribibundus) feeding on the sludge was investigated. a close association was demonstrated between the serotypes found in both types of sample. salmonella takoradi (a serotype which is uncommon in scotland) appeared in the sludge for two short periods during the twelve week study and on both occasions it was later found in the gull faeces. it was shown that gulls become infected after feeding on ... | 1984 | 6746468 |
| [selection of antigenic variants of h1n1 influenza viruses by means of monoclonal antibodies]. | six different monoclonal antibodies to influenza a/brazil/11/78 virus hemagglutinin were used for selection of antigenic variants of h1n1 viruses: a/ussr/090/77 and a/black-headed gull/ kaz . ssr/470/79. the group-specific monoclonal antibody completely neutralized the infective activity of the parental viruses (dilutions 1:5 to 1:640). two antigenic variants of wild type viruses were obtained using cross-reactive antibody. a comparative study of the antigenic structure, biological properties, a ... | 1984 | 6730437 |
| [incidence of influenza virus infection in black-headed gulls]. | two strains of influenza a viruses were isolated in 1978 from tracheal washings of 18 nestlings of black-headed gulls examined for influenza. three strains of influenza a viruses were isolated in 1979 from 55 gull embryos collected in the same colony, the isolates being similar in their antigenic characteristics with the influenza virus isolated from a gull nestling in 1978. this confirms the possibility of simultaneous circulation of antigenically different variants of influenza a virus among b ... | 1984 | 6730433 |
| morphogenesis and evolutionary morphology of the nasal apparatus of the black-headed gull (larus ridibundus l.) morphogenesis of the nasal capsule, nasal epithelial tube and organ of jacobson in sauropsida. ix. | 1984 | 6519592 | |
| morphogenesis and evolutionary morphology of the nasal apparatus of the black-headed gull (larus ridibundus l.) morphogenesis of the nasal capsule, nasal epithelial tube and organ of jacobson in sauropsida. ix. | 1984 | 6519592 | |
| [isolation of influenza a viruses with a new antigenic formula from wild birds]. | three hemagglutinating agents were isolated from mixed pools of the viscera from black-headed gulls (larus ridibundus) and robin (erithacus rubecula) collected in the byelorussian ssa and the kaliningrad region of the rsfsr. typing of the viruses by double immunodiffusion technique revealed antigenic relationships of the viruses with swine hemagglutinin (hsw1) and human hemagglutinin h0. one of the strains had neuraminidase n2 the other two nav2. an analysis of the polypeptide composition of the ... | 1981 | 6455856 |
| [isolation of influenza a viruses with a new antigenic formula from wild birds]. | three hemagglutinating agents were isolated from mixed pools of the viscera from black-headed gulls (larus ridibundus) and robin (erithacus rubecula) collected in the byelorussian ssa and the kaliningrad region of the rsfsr. typing of the viruses by double immunodiffusion technique revealed antigenic relationships of the viruses with swine hemagglutinin (hsw1) and human hemagglutinin h0. one of the strains had neuraminidase n2 the other two nav2. an analysis of the polypeptide composition of the ... | 1981 | 6455856 |
| [properties of hav6neq2 and hswl(h0)hav2 influenza viruses isolated from waterfowl in southern turkmenia]. | three influenza a virus strains were isolated from shorebirds in october, 1977, in southern turkmenia, in the vicinities of tedzhen water reservoir. from a common tern, a/sterna hirundo/turkmenia/45/77 strain was isolated with the antigenic formula hav6neq2, from a teal and a black-headed gull influenza a/anas crecca/turkmenia/4/77 and a/larus ridibundus/turkmenia/13/77 strains with previously unknown combination of surface antigens hswl(h0)nav2 were recovered. by the molecular weight of the hea ... | 1980 | 6448515 |
| [properties of hav6neq2 and hswl(h0)hav2 influenza viruses isolated from waterfowl in southern turkmenia]. | three influenza a virus strains were isolated from shorebirds in october, 1977, in southern turkmenia, in the vicinities of tedzhen water reservoir. from a common tern, a/sterna hirundo/turkmenia/45/77 strain was isolated with the antigenic formula hav6neq2, from a teal and a black-headed gull influenza a/anas crecca/turkmenia/4/77 and a/larus ridibundus/turkmenia/13/77 strains with previously unknown combination of surface antigens hswl(h0)nav2 were recovered. by the molecular weight of the hea ... | 1980 | 6448515 |
| [botulism of aquatic birds at the starý u pohorelic pond (breclav district)]. | in the years 1981 and 1982 when a mass mortality of wild and domestic water birds was observed on the starý pond, eleven diseases or just died birds were examined by the neutralization test for botulotoxin and four sludge samples for the presence of clostridium botulinum. c. botulinum toxin of c type was detected in four wild ducks (anas platyrhynchos) from september 1981 and july 1982 and in one gull (larus ridibundus) and july 1982. the highest titres (of mice i. p. ld50/g) of botulotoxin in d ... | 1984 | 6441338 |
| [botulism of aquatic birds at the starý u pohorelic pond (breclav district)]. | in the years 1981 and 1982 when a mass mortality of wild and domestic water birds was observed on the starý pond, eleven diseases or just died birds were examined by the neutralization test for botulotoxin and four sludge samples for the presence of clostridium botulinum. c. botulinum toxin of c type was detected in four wild ducks (anas platyrhynchos) from september 1981 and july 1982 and in one gull (larus ridibundus) and july 1982. the highest titres (of mice i. p. ld50/g) of botulotoxin in d ... | 1984 | 6441338 |
| avian wildlife reservoir of campylobacter fetus subsp. jejuni, yersinia spp., and salmonella spp. in norway. | cloacal swabs from 540 wild-living birds were cultured for campylobacter fetus subsp. jejuni, yersinia spp., and salmonella spp. the carrier rates detected were as follows: c. fetus subsp. jejuni, 28.4%; yersinia spp., 1.2%; and salmonella spp., 0.8%. all birds were apparently healthy when captured. c. fetus subsp. jejuni was isolated from 11 of the 40 bird species examined. among birds inhabiting the city of oslo, the highest isolation rate was found in crows (corvus corone cornix) (89.8%), fol ... | 1983 | 6338824 |
| avian wildlife reservoir of campylobacter fetus subsp. jejuni, yersinia spp., and salmonella spp. in norway. | cloacal swabs from 540 wild-living birds were cultured for campylobacter fetus subsp. jejuni, yersinia spp., and salmonella spp. the carrier rates detected were as follows: c. fetus subsp. jejuni, 28.4%; yersinia spp., 1.2%; and salmonella spp., 0.8%. all birds were apparently healthy when captured. c. fetus subsp. jejuni was isolated from 11 of the 40 bird species examined. among birds inhabiting the city of oslo, the highest isolation rate was found in crows (corvus corone cornix) (89.8%), fol ... | 1983 | 6338824 |
| elimination of some enteroviruses in the excrements of experimentally infected rats (rattus norvegicus) and gulls (larus ridibundus). | young rats of both sexes, weight 150-170 g, the first laboratory progeny of captured wild parent pairs, were used throughout this experiment. rats in two experimental groups comprising a total of 34 animals were infected orally with type 2 poliovirus vaccine strain given in each group at doses of 500, 5000 or 50,000 tcd50. in the first experiment, the presence of poliovirus in rat excrements was detectable irregularly till day 13, in the second experiment till day 2 after infection. small quanti ... | 1984 | 6092458 |
| elimination of some enteroviruses in the excrements of experimentally infected rats (rattus norvegicus) and gulls (larus ridibundus). | young rats of both sexes, weight 150-170 g, the first laboratory progeny of captured wild parent pairs, were used throughout this experiment. rats in two experimental groups comprising a total of 34 animals were infected orally with type 2 poliovirus vaccine strain given in each group at doses of 500, 5000 or 50,000 tcd50. in the first experiment, the presence of poliovirus in rat excrements was detectable irregularly till day 13, in the second experiment till day 2 after infection. small quanti ... | 1984 | 6092458 |
| [on comparative osteogenesis of gallus domesticus l., larus ridibundus l. and larus canus l. iv. growth of bones of larus canus l. (conclusion)]. | 1968 | 5705506 | |
| [on comparative osteogenesis of gallus domesticus l., larus ridibundus l. and larus canus l. iv. growth of bones of larus canus l. (conclusion)]. | 1968 | 5705506 | |
| [on the comparative osteogenesis in gallus domesticuls l., larus ridibundus l. and larus canus l. 3. bone development of gallus domesticus l. and larus ridibundus l]. | 1968 | 5671978 | |
| [on the comparative osteogenesis in gallus domesticuls l., larus ridibundus l. and larus canus l. 3. bone development of gallus domesticus l. and larus ridibundus l]. | 1968 | 5671978 | |
| [on comparative osteogenesis of gallus domesticus l., larus ridibundus l. and larus canus l. ii. timely appearance of ossifications in larus ridibundus l. and larus canus l]. | 1967 | 5597019 |