Publications
| Title | Abstract | Year Filter | PMID(sorted ascending) Filter |
|---|
| 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 |
| [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 | |
| [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 | |
| 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 | |
| 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 | |
| [contribution to the topochemistry of carbohydrates in embryonal kidneys in the laughing gull (larus ridibundus l.)]. | 1959 | 13669952 | |
| [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 | |
| [the organic nucleus of the mammilla in the early stages of formation of the eggshell of larus ridibundus]. | 1965 | 14268261 | |
| 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 |
| 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 |
| [observations on the development of the hypophysis in the black-headed gull]. | 1951 | 14826990 | |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| head-bobbing and non-bobbing walking of black-headed gulls (larus ridibundus). | head-bobbing walking (hbw) and non-bobbing walking (nbw) of black-headed gulls were compared from kinematic and behavioral/environmental viewpoints. the birds walked with a longer stride length and lower stride frequency during the hbw than during the nbw. with respect to these two parameters, the hbw of black-headed gulls was similar to that of other head-bobbers, and the nbw was similar to that of other non-bobbers. the stride length and the amplitude of head bobbing were correlated. these res ... | 2006 | 16432727 |
| multiple pathways of maternal effects in black-headed gull eggs: constraint and adaptive compensatory adjustment. | we investigated in the black-headed gull whether female deposition of antioxidants and immunoglobulins (enhancing early immune function), and testosterone (suppressing immune function and increasing early competitive skills) correlate suggesting that evolution has favoured the mutual adjustment of different pathways for maternal effects. we also took egg mass, the position of the egg in the laying sequence and offspring sex into account, as these affect offspring survival. yolk antioxidant and i ... | 2006 | 16780531 |
| energetic influence on gull flight strategy selection. | during non-migratory flight, gulls (larids) use a wide variety of flight strategies. we investigate the extent to which the energy balance of a bird explains flight strategy selection. we develop a model based on optimal foraging and aerodynamic theories, to calculate the ground speeds and airspeeds at which a gull is expected to flap or soar during foraging flight. the model results are compared with observed flight speeds, directions, and flight strategies of two species of gulls, the black-he ... | 2006 | 16943489 |
| energetic influence on gull flight strategy selection. | during non-migratory flight, gulls (larids) use a wide variety of flight strategies. we investigate the extent to which the energy balance of a bird explains flight strategy selection. we develop a model based on optimal foraging and aerodynamic theories, to calculate the ground speeds and airspeeds at which a gull is expected to flap or soar during foraging flight. the model results are compared with observed flight speeds, directions, and flight strategies of two species of gulls, the black-he ... | 2006 | 16943489 |
| balancing between costs and benefits of maternal hormone deposition in avian eggs. | avian eggs contain substantial amounts of maternal androgens, and several studies have indicated that these are beneficial for the chick. nevertheless, there is a large and systematic variation in maternal hormone concentrations both within and between clutches. if maternal androgens also involve costs, this might explain why not all mothers put high levels of androgens in their clutches. however, the simultaneous occurrence of both benefits and costs has not yet been convincingly demonstrated. ... | 2005 | 17148133 |
| avian mothers create different phenotypes by hormone deposition in their eggs. | an increasing number of studies in a variety of taxa demonstrate the role of maternal sex steroids on offspring development. in avian species, mothers deposit substantial amounts of androgens in their eggs, and experimental evidence indicates that these maternal androgens influence the chick's early development. despite the well-known organizing role of sex steroids on brain and behaviour, studies on avian maternal egg hormones almost exclusively focus on the chick phase. here, we show experimen ... | 2006 | 17148315 |
| bioaccumulation, temporal trend, and geographical distribution of synthetic musks in the marine environment. | bioaccumulation of synthetic musks in a marine food chain was investigated by analyzing marine organisms at various trophic levels, including lugworm, clam, crustacean, fish, marine mammal, and bird samples collected from tidal flat and shallow water areas of the ariake sea, japan. two of the polycyclic musks, hhcb and ahtn, were the dominant compounds found in most of the samples analyzed, whereas nitro musks were not detected in any of the organisms, suggesting greater usage of polycyclic musk ... | 2007 | 17438766 |
| high prevalence of antimicrobial-resistant genes and integrons in escherichia coli isolates from black-headed gulls in the czech republic. | to carry out an assessment of the occurrence of resistance to antimicrobials in escherichia coli that has been isolated from young black-headed gulls in three nesting colonies. | 2007 | 17584448 |
| nereidid polychaetes as the major diet of migratory shorebirds on the estuarine tidal flats at fujimae-higata in japan. | the dietary items of five migratory shorebirds, dunlin (calidris alpina), red-necked stint (c. ruficollis), grey plover (pluvialis squatarola), whimbrel (numenius phaeopus) and black-headed gull (larus ridibundus), were examined by analyses of fecal droppings during the birds' migration or wintering and by surveys of macrobenthic fauna around their foraging sites on the tidal flats of fujimae-higata, nagoya, central japan. body parts of nereidid, capitellid, and spionid polychaetes and crustacea ... | 2007 | 17824775 |
| nereidid polychaetes as the major diet of migratory shorebirds on the estuarine tidal flats at fujimae-higata in japan. | the dietary items of five migratory shorebirds, dunlin (calidris alpina), red-necked stint (c. ruficollis), grey plover (pluvialis squatarola), whimbrel (numenius phaeopus) and black-headed gull (larus ridibundus), were examined by analyses of fecal droppings during the birds' migration or wintering and by surveys of macrobenthic fauna around their foraging sites on the tidal flats of fujimae-higata, nagoya, central japan. body parts of nereidid, capitellid, and spionid polychaetes and crustacea ... | 2007 | 17824775 |
| an evaluation of techniques to control problem bird species on landfill sites. | birds feeding on landfill sites cause problems in terms of nuisance to neighbors, flight safety, a threat to public health, and affecting the day to day site operation. a number of control measures exist to deter problem species; however, research into their effectiveness across sites and for multiple species has been limited. we use a modeling approach in order to assess the effectiveness of nine techniques--pyrotechnics, hand-held distress calls, static distress calls, blank ammunition, a comb ... | 2008 | 18256779 |
| an evaluation of techniques to control problem bird species on landfill sites. | birds feeding on landfill sites cause problems in terms of nuisance to neighbors, flight safety, a threat to public health, and affecting the day to day site operation. a number of control measures exist to deter problem species; however, research into their effectiveness across sites and for multiple species has been limited. we use a modeling approach in order to assess the effectiveness of nine techniques--pyrotechnics, hand-held distress calls, static distress calls, blank ammunition, a comb ... | 2008 | 18256779 |
| serologic survey of potential vertebrate hosts for west nile virus in poland. | a survey for antibodies to west nile virus (wnv; genus ,flavivirus) was carried out by plaque-re-duction neutralization microtesting in 78 horses, 20 domestic chickens, and 97 wild birds belonging to 10 species from different areas in poland. specific antibodies were detected in five juvenile (hatching-year) birds collected in 2006: three white storks (ciconia ciconia) in a wildlife rehabilitation center (5.4% of all examined storks; the antibody titers in each bird were 1:320, 1:160, and 1:20), ... | 2008 | 18433332 |
| serologic survey of potential vertebrate hosts for west nile virus in poland. | a survey for antibodies to west nile virus (wnv; genus ,flavivirus) was carried out by plaque-re-duction neutralization microtesting in 78 horses, 20 domestic chickens, and 97 wild birds belonging to 10 species from different areas in poland. specific antibodies were detected in five juvenile (hatching-year) birds collected in 2006: three white storks (ciconia ciconia) in a wildlife rehabilitation center (5.4% of all examined storks; the antibody titers in each bird were 1:320, 1:160, and 1:20), ... | 2008 | 18433332 |
| phenotypic characteristics of riemerella anatipestifer and similar micro-organisms from various hosts. | a total of 199 riemerella anatipestifer (ra) and ra-like field strains isolated culturally from birds of 12 different species and from pigs were characterized using classical phenotypic and chemotaxonomic tests. the ra reference strain atcc 11845 was included in the study. on the basis of the classical phenotypic characteristics studied and the numerical analysis of the whole-cell fatty acid patterns, the ra reference strain and 123 field isolates were assigned to the indole negative (in) varian ... | 1998 | 18483963 |
| the relation among gonadal steroids, immunocompetence, body mass, and behavior in young black-headed gulls (larus ridibundus). | we experimentally examined the effect of testosterone on the antibody response to a single immunization with sheep red blood cells in young black-headed gulls. this species performs a number of testosterone-mediated elaborate postural displays in social interactions and breeds in dense colonies in which there is a high likelihood of infectious diseases. in young chicks, only one-third were capable of responding to immunization. in the responding chicks, testosterone enhanced antibody titers. eve ... | 1997 | 18811282 |
| the relation among gonadal steroids, immunocompetence, body mass, and behavior in young black-headed gulls (larus ridibundus). | we experimentally examined the effect of testosterone on the antibody response to a single immunization with sheep red blood cells in young black-headed gulls. this species performs a number of testosterone-mediated elaborate postural displays in social interactions and breeds in dense colonies in which there is a high likelihood of infectious diseases. in young chicks, only one-third were capable of responding to immunization. in the responding chicks, testosterone enhanced antibody titers. eve ... | 1997 | 18811282 |
| metastatic hepatocellular carcinoma and subcutaneous fibrosarcoma in a black-headed gull (larus ridibundus). | 2009 | 19202174 | |
| metastatic hepatocellular carcinoma and subcutaneous fibrosarcoma in a black-headed gull (larus ridibundus). | 2009 | 19202174 | |
| antibiotic-resistant salmonella and escherichia coli isolates with integrons and extended-spectrum beta-lactamases in surface water and sympatric black-headed gulls. | to examine surface water from a pond in the northeastern part of the czech republic and young black-headed gulls (larus ridibundus) nesting on the same pond for the presence of antibiotic-resistant salmonella and escherichia coli. | 2009 | 19245407 |
| antibiotic-resistant salmonella and escherichia coli isolates with integrons and extended-spectrum beta-lactamases in surface water and sympatric black-headed gulls. | to examine surface water from a pond in the northeastern part of the czech republic and young black-headed gulls (larus ridibundus) nesting on the same pond for the presence of antibiotic-resistant salmonella and escherichia coli. | 2009 | 19245407 |
| experience modulates both aromatase activity and the sensitivity of agonistic behaviour to testosterone in black-headed gulls. | in young black-headed gulls (larus ridibundus), exposure to testosterone increases the sensitivity of agonistic behaviour to a subsequent exposure to this hormone. the aim of this paper is twofold: to analyze whether social experience, gained during testosterone exposure, mediates this increase in hormonal sensitivity (priming), and whether this in turn is mediated by an increase in central aromatase activity. to this end, we performed three experiments. in the first juvenile gulls were exposed ... | 2009 | 19419676 |
| maternal yolk androgens stimulate territorial behaviour in black-headed gull chicks. | avian eggs contain substantial amounts of maternal androgens. the concentrations of these yolk androgens are affected by the maternal environment, such as the level of social competition, parasite exposure or food conditions. since yolk androgens have been shown to affect a wide array of offspring traits, they may adjust the chicks to the expected post-hatching environment, but experimental evidence is still scarce. we investigate in colonial breeding black-headed gulls whether high concentratio ... | 2009 | 19515649 |
| campylobacter volucris sp. nov., isolated from black-headed gulls (larus ridibundus). | during a study of the prevalence of campylobacter jejuni in black-headed gulls (larus ridibundus) in sweden, three isolates, strains lmg 24379, lmg 24380t and lmg 24381, were initially identified as campylobacter lari. further characterization by both aflp and whole-cell protein sds-page analyses revealed that they formed a distinct group in the genus campylobacter. this unique position was confirmed by phenotypic characterization, 16s rrna and hsp60 gene sequence analysis and dna-dna hybridizat ... | 2010 | 19767353 |
| campylobacter volucris sp. nov., isolated from black-headed gulls (larus ridibundus). | during a study of the prevalence of campylobacter jejuni in black-headed gulls (larus ridibundus) in sweden, three isolates, strains lmg 24379, lmg 24380t and lmg 24381, were initially identified as campylobacter lari. further characterization by both aflp and whole-cell protein sds-page analyses revealed that they formed a distinct group in the genus campylobacter. this unique position was confirmed by phenotypic characterization, 16s rrna and hsp60 gene sequence analysis and dna-dna hybridizat ... | 2010 | 19767353 |
| breeding dispersal in black-headed gull: the value of familiarity in a contrasted environment. | 1. some species (e.g. migratory species with high movement ability) are unlikely to experience any physical cost when dispersing, at least at the landscape scale. in these species dispersal is nevertheless behaviourally constrained to avoid non-physical costs such as the loss of familiarity with the breeding environment, and these constraints can be maladaptive in a fast-changing environment. 2. we evaluated such constraints using multievent modelling of a 20-year capture-mark-recapture data set ... | 2010 | 19891713 |
| characterization of low pathogenicity avian influenza viruses isolated from wild birds in mongolia 2005 through 2007. | since the emergence of h5n1 high pathogenicity (hp) avian influenza virus (aiv) in asia, numerous efforts worldwide have focused on elucidating the relative roles of wild birds and domestic poultry movement in virus dissemination. in accordance with this a surveillance program for aiv in wild birds was conducted in mongolia from 2005-2007. an important feature of mongolia is that there is little domestic poultry production in the country, therefore aiv detection in wild birds would not likely be ... | 2009 | 19891786 |
| characterization of low pathogenicity avian influenza viruses isolated from wild birds in mongolia 2005 through 2007. | since the emergence of h5n1 high pathogenicity (hp) avian influenza virus (aiv) in asia, numerous efforts worldwide have focused on elucidating the relative roles of wild birds and domestic poultry movement in virus dissemination. in accordance with this a surveillance program for aiv in wild birds was conducted in mongolia from 2005-2007. an important feature of mongolia is that there is little domestic poultry production in the country, therefore aiv detection in wild birds would not likely be ... | 2009 | 19891786 |
| multiple introduction of asian h5n1 avian influenza virus in croatia by wild birds during 2005-2006 and isolation of the virus from apparently healthy black-headed gulls (larus ridibundus). | this study describes the introduction and spread of avian influenza a (h5n1) subtype in croatia. seventeen isolates were identified during the period from october 2005 to march 2006, all originating from wild birds. the full-length nucleotide sequence analysis of the hemagglutinin (ha) gene of seven representative isolates revealed that three distinct genetic strains involved in the outbreaks, implicating at least three independent introductions of the virus into croatia during a relatively shor ... | 2010 | 20370426 |
| multiple introduction of asian h5n1 avian influenza virus in croatia by wild birds during 2005-2006 and isolation of the virus from apparently healthy black-headed gulls (larus ridibundus). | this study describes the introduction and spread of avian influenza a (h5n1) subtype in croatia. seventeen isolates were identified during the period from october 2005 to march 2006, all originating from wild birds. the full-length nucleotide sequence analysis of the hemagglutinin (ha) gene of seven representative isolates revealed that three distinct genetic strains involved in the outbreaks, implicating at least three independent introductions of the virus into croatia during a relatively shor ... | 2010 | 20370426 |
| mercury concentration in 3 species of gulls, larus ridibundus, larus minutus, larus canus, from south coast of the caspian sea, iran. | in this study, the mercury concentrations of liver, breast feathers and tail feathers in three species of gull; black-headed gull (larus ridibundus), common gull (larus canus) and little gull (larus minutus) from the south coast of the caspian sea in iran were assayed. mercury accumulation in liver, breast feathers and tail feathers of species were 1.69-3.16, 2.88-7.18 and 2.09-5.66 mg/kg, respectively. mercury concentration hierarchy in tissues we tested was as follows: breast feather > tail fe ... | 2010 | 20424818 |
| mercury concentration in 3 species of gulls, larus ridibundus, larus minutus, larus canus, from south coast of the caspian sea, iran. | in this study, the mercury concentrations of liver, breast feathers and tail feathers in three species of gull; black-headed gull (larus ridibundus), common gull (larus canus) and little gull (larus minutus) from the south coast of the caspian sea in iran were assayed. mercury accumulation in liver, breast feathers and tail feathers of species were 1.69-3.16, 2.88-7.18 and 2.09-5.66 mg/kg, respectively. mercury concentration hierarchy in tissues we tested was as follows: breast feather > tail fe ... | 2010 | 20424818 |
| prevalence and subtypes of influenza a viruses in wild waterfowl in norway 2006-2007. | the prevalence of influenza a virus infection, and the distribution of different subtypes of the virus, were studied in 1529 ducks and 1213 gulls shot during ordinary hunting from august to december in two consecutive years, 2006 and 2007, in norway. the study was based on molecular screening of cloacal and tracheal swabs, using a pan-influenza a rt-pcr. samples found to be positive for influenza a virus were screened for the h5 subtype, using a h5 specific rt-pcr, and, if negative, further subt ... | 2010 | 20426812 |
| complete genome analysis of an avian paramyxovirus type 1 strain isolated in 1994 from an asymptomatic black-headed gull (larus ridibundus) in southern sweden. | the complete genome sequence of an avian paramyxovirus serotype 1 (apmv-1) isolated from a black-headed gull (larus ridibundus) in sweden was determined and compared with other apmv-1 sequences. sequence analyses showed that this isolate consists of six genes in the order 3'-np-p-m-f-hn-l-5', is 15,186 nucleotides long, and contains a typical, avirulent fusion protein cleavage site. it was also shown to have a hemagglutinin-neuraminidase protein with a length of 585 amino acids (aa) instead of t ... | 2010 | 20608541 |
| complete genome analysis of an avian paramyxovirus type 1 strain isolated in 1994 from an asymptomatic black-headed gull (larus ridibundus) in southern sweden. | the complete genome sequence of an avian paramyxovirus serotype 1 (apmv-1) isolated from a black-headed gull (larus ridibundus) in sweden was determined and compared with other apmv-1 sequences. sequence analyses showed that this isolate consists of six genes in the order 3'-np-p-m-f-hn-l-5', is 15,186 nucleotides long, and contains a typical, avirulent fusion protein cleavage site. it was also shown to have a hemagglutinin-neuraminidase protein with a length of 585 amino acids (aa) instead of t ... | 2010 | 20608541 |
| characterization, and comparison, of human clinical and black-headed gull (larus ridibundus) extended-spectrum beta-lactamase-producing bacterial isolates from kalmar, on the southeast coast of sweden. | antibiotic resistance is one of the great challenges for modern healthcare. in gram-negative bacteria, ctx-m-type extended-spectrum beta-lactamases (esbls) have been rapidly spreading through europe since the early 2000s. in sweden, esbl-producing escherichia coli are still rare, but a 3-fold increase has been seen from 2004 to 2007. enterobacteria and normal flora of wild animals, with or without antibiotic resistance traits, constitute a potential source of human infection and colonization. we ... | 2010 | 20615928 |
| characterization, and comparison, of human clinical and black-headed gull (larus ridibundus) extended-spectrum beta-lactamase-producing bacterial isolates from kalmar, on the southeast coast of sweden. | antibiotic resistance is one of the great challenges for modern healthcare. in gram-negative bacteria, ctx-m-type extended-spectrum beta-lactamases (esbls) have been rapidly spreading through europe since the early 2000s. in sweden, esbl-producing escherichia coli are still rare, but a 3-fold increase has been seen from 2004 to 2007. enterobacteria and normal flora of wild animals, with or without antibiotic resistance traits, constitute a potential source of human infection and colonization. we ... | 2010 | 20615928 |
| begging coordination between siblings in black-headed gulls. | communication behaviours are now considered from a signallers-receivers network perspective. this concept seems well suited to the study of interactions between parents and offspring in birds, so far mainly treated as a dyadic signalling system involving the brood or a single chick as a signaller and the parent as a receiver. family conflicts over resource allocation drive parent-offspring and sib-sib communication. in the black-headed gull larus ridibundus, parents respond to the whole-brood be ... | 2010 | 20816649 |
| begging coordination between siblings in black-headed gulls. | communication behaviours are now considered from a signallers-receivers network perspective. this concept seems well suited to the study of interactions between parents and offspring in birds, so far mainly treated as a dyadic signalling system involving the brood or a single chick as a signaller and the parent as a receiver. family conflicts over resource allocation drive parent-offspring and sib-sib communication. in the black-headed gull larus ridibundus, parents respond to the whole-brood be ... | 2010 | 20816649 |
| eggshell permeability: a standard technique for determining interspecific rates of water vapor conductance. | typically, eggshell water vapor conductance is measured on whole eggs, freshly collected at the commencement of a study. at times, however, it may not be possible to obtain whole fresh eggs but rather egg fragments or previously blown eggs. here we evaluate and describe in detail a technique for modern laboratory analysis of eggshell conductance that uses fragments from fresh and museum eggs to determine eggshell water vapor conductance. we used fresh unincubated eggs of domesticated chickens (g ... | 2010 | 20939733 |
| eggshell permeability: a standard technique for determining interspecific rates of water vapor conductance. | typically, eggshell water vapor conductance is measured on whole eggs, freshly collected at the commencement of a study. at times, however, it may not be possible to obtain whole fresh eggs but rather egg fragments or previously blown eggs. here we evaluate and describe in detail a technique for modern laboratory analysis of eggshell conductance that uses fragments from fresh and museum eggs to determine eggshell water vapor conductance. we used fresh unincubated eggs of domesticated chickens (g ... | 2010 | 20939733 |
| studying dispersal at the landscape scale: efficient combination of population surveys and capture-recapture data. | researchers often rely on capture-mark-recapture (cmr) data to study animal dispersal in the wild. yet their spatial coverage often does not encompass the entire dispersal range of the study individuals, sometimes producing misleading results. information contained in population surveys and variation in population spatial structure can be used to overcome this issue. we build an integrated model in a multisite context in which cmr data are only collected at a subset of sites, but numbers of bree ... | 2010 | 21141197 |
| avian embryonic development does not change the stable isotope composition of the calcite eggshell. | the avian embryo resorbs most of the calcium for bone formation from the calcite eggshell but the exact mechanisms of the resorption are unknown. the present study tested whether this process results in variable fractionation of the oxygen and carbon isotopes in shell calcium carbonate, which could provide a detailed insight into the temporal and spatial use of the eggshell by the developing embryo. despite the uncertainty regarding changes in stable isotope composition of the eggshell across de ... | 2011 | 21211467 |
| avian embryonic development does not change the stable isotope composition of the calcite eggshell. | the avian embryo resorbs most of the calcium for bone formation from the calcite eggshell but the exact mechanisms of the resorption are unknown. the present study tested whether this process results in variable fractionation of the oxygen and carbon isotopes in shell calcium carbonate, which could provide a detailed insight into the temporal and spatial use of the eggshell by the developing embryo. despite the uncertainty regarding changes in stable isotope composition of the eggshell across de ... | 2011 | 21211467 |
| first report of (homo)anatoxin-a and dog neurotoxicosis after ingestion of benthic cyanobacteria in the netherlands. | in april and may 2011, three dogs died and one dog became ill after swimming in lake ijmeer (the netherlands). at the time, the lake was infested with the benthic cyanobacterial species phormidium. a eurasian coot (fulica atra) and a black-headed gull (chroicocephalus ridibundus) also died near lake ijmeer in the same period. one of the dogs and both birds were subjected to a pathological investigation. furthermore, the phormidium mat; algal samples from the dikes; contents of the animals' diges ... | 2012 | 22534073 |
| development of an improved method for trace analysis of quinolones in eggs of laying hens and wildlife species using molecularly imprinted polymers. | a sensitive, selective, and efficient method was developed for simultaneous determination of 11 fluoroquinolones (fqs), ciprofloxacin, danofloxacin, difloxacin, enrofloxacin, flumequine, marbofloxacin, norfloxacin, ofloxacin, oxolinic acid, pipemidic acid, and sarafloxacin, in eggs by molecularly imprinted polymer (mip) and column liquid chromatography-electrospray ionization-tandem mass spectrometry (lc-esi-ms/ms). samples were diluted with 50 mm sodium dihydrogen phosphate at ph 7.4, followed ... | 2012 | 23009602 |
| tissue tropism and pathology of natural influenza virus infection in black-headed gulls (chroicocephalus ridibundus). | black-headed gulls (chroicocephalus ridibundus) are a suitable host species to study the epidemiology of low-pathogenic avian influenza virus (lpaiv) infection in wild waterbirds because they are a common colony-breeding species in which lpaiv infection is detected frequently, limited mainly to the h13 and h16 subtypes. however, the sites of virus replication and associated lesions are poorly understood. we therefore performed virological and pathological analyses on tissues of black-headed gull ... | 2012 | 23237367 |
| avian influenza virus surveillance in wild birds in georgia: 2009-2011. | the caucasus, at the border of europe and asia, is important for migration and over-wintering of wild waterbirds. three flyways, the central asian, east africa-west asia, and mediterranean/black sea flyways, converge in the caucasus region. thus, the caucasus region might act as a migratory bridge for influenza virus transmission when birds aggregate in high concentrations in the post-breeding, migrating and overwintering periods. since august 2009, we have established a surveillance network for ... | 2013 | 23516501 |
| effect of rapid modulation of circulating plasma testosterone concentration on begging, aggressive behavior and competition for food in black-headed gull (larus ridibundus) chicks. | sibling competition mediated by begging behavior is extremely common in avian species and recent studies have highlighted the role of endogenous testosterone in regulating such phenomenon. however, current literature depicts an inconsistent pattern in altricial vs. semi-precocial species, with stimulating versus inhibitory effects of the hormone respectively. this is possibly due to a difference in the methodology of hormone treatment (short-term moderate dose versus a long-term stronger elevati ... | 2013 | 23962563 |
| effect of rapid modulation of circulating plasma testosterone concentration on begging, aggressive behavior and competition for food in black-headed gull (larus ridibundus) chicks. | sibling competition mediated by begging behavior is extremely common in avian species and recent studies have highlighted the role of endogenous testosterone in regulating such phenomenon. however, current literature depicts an inconsistent pattern in altricial vs. semi-precocial species, with stimulating versus inhibitory effects of the hormone respectively. this is possibly due to a difference in the methodology of hormone treatment (short-term moderate dose versus a long-term stronger elevati ... | 2013 | 23962563 |
| the value of chick feathers to assess spatial and interspecific variation in the mercury contamination of seabirds. | in 1991 we compared eggs, down and body feathers of chicks of common terns, herring gulls and black-headed gulls in their utility to assess contamination with mercury. like eggs feathers distinctly show interspecific and intersite differences in contamination. highest levels were found in common terns, lowest in black-headed gulls. chicks hatched at the elbe had much higher mercury levels than those in other areas of the german north sea coast. conversion ratios between tissues have to be used w ... | 1993 | 24221187 |
| epidemiology of influenza a virus among black-headed gulls, the netherlands, 2006-2010. | we sampled 7,511 black-headed gulls for influenza virus in the netherlands during 2006-2010 and found that subtypes h13 and h16 caused annual epidemics in fledglings on colony sites. our findings validate targeted surveillance of wild waterbirds and clarify underlying factors for influenza virus emergence in other species. | 2014 | 24377955 |
| trophic transfer of dechloranes in the marine food web of liaodong bay, north china. | dechloranes are of particular concern because of their ubiquity in environmental matrices, but little is known about their trophic transfer in aquatic food web. this study investigated the trophic transfer of seven dechloranes in a marine food web from liaodong bay, china. dechloranes were determined in sediments and 15 marine species including benthic invertebrates, fish and gulls collected from liaodong bay. biomagnification factors (bmftl) of dechloranes in black-headed gulls were calculated ... | 2014 | 24702310 |
| prevalence of antibody to toxoplasma gondii in black-headed gulls (chroicocephalus ridibundus), dianchi lake, china. | sera from 659 black-headed gulls (chroicocephalus ridibundus) in dianchi lake, china were assayed for toxoplasma gondii antibodies using the modified agglutination test (mat). specific t. gondii antibodies were detected in 131 (19.9%) black-headed gulls (mat titer ≥ 1 ∶ 5). these results indicate that t. gondii infection is common in black-headed gulls. | 2014 | 24807354 |
| experimental infection of highly pathogenic avian influenza virus h5n1 in black-headed gulls (chroicocephalus ridibundus). | historically, highly pathogenic avian influenza viruses (hpaiv) rarely resulted in infection or clinical disease in wild birds. however, since 2002, disease and mortality from natural hpaiv h5n1 infection have been observed in wild birds including gulls. we performed an experimental hpaiv h5n1 infection of black-headed gulls (chroicocephalus ridibundus) to determine their susceptibility to infection and disease from this virus, pattern of viral shedding, clinical signs, pathological changes and ... | 2014 | 25135340 |
| molecular identification of cryptosporidium spp. in seagulls, pigeons, dogs, and cats in thailand. | zoonotic cryptosporidium spp., particularly c. meleagridis, c. canis, and c. felis, are enteric protozoa responsible for major public health concerns around the world. to determine the spread of this parasite in thailand, we conducted molecular identification of cryptosporidium spp. from animal samples around the country, by collecting and investigating the feces of seagulls (chroicocephalus brunnicephalus and chroicocephalus ridibundus), domestic pigeons (columba livia domestica), dogs, and cat ... | 2014 | 25297887 |
| the complete mitochondrial genome of the black-headed gull chroicocephalus ridibundus (charadriiformes: laridae). | the black-headed gull chroicocephalus ridibundus is a waterbird, which breeds from north-east north america and across much of europe and asia. in this study, we determined its complete mitochondrial dna sequence by pcr-based approach. the complete mtdna sequence is 16,807 bp in size. the overall-based composition was 30.8% a, 31.1% t, 14.2% c, 24.0% g, with an a + t content (54.8%) rich feature. the mitochondrial genome consists of 13 protein-coding genes, 22 trna genes, 2 rrna genes, and 1 con ... | 2016 | 25350738 |
| antimicrobial resistance in wildlife: implications for public health. | the emergence and spread of antimicrobial-resistant (amr) bacteria in natural environments is a major concern with serious implications for human and animal health. the aim of this study was to determine the prevalence of amr escherichia coli (e. coli) in wild birds and mammalian species. thirty faecal samples were collected from each of the following wildlife species: herring gulls (larus argentatus), black-headed gulls (larus ridibundus), lesser black-back gulls (larus fuscus), hybrid deer spe ... | 2015 | 25639901 |
| antimicrobial resistance in wildlife: implications for public health. | the emergence and spread of antimicrobial-resistant (amr) bacteria in natural environments is a major concern with serious implications for human and animal health. the aim of this study was to determine the prevalence of amr escherichia coli (e. coli) in wild birds and mammalian species. thirty faecal samples were collected from each of the following wildlife species: herring gulls (larus argentatus), black-headed gulls (larus ridibundus), lesser black-back gulls (larus fuscus), hybrid deer spe ... | 2015 | 25639901 |
| long-term effect of serial infections with h13 and h16 low-pathogenic avian influenza viruses in black-headed gulls. | infections of domestic and wild birds with low-pathogenic avian influenza viruses (lpaivs) have been associated with protective immunity to subsequent infection. however, the degree and duration of immunity in wild birds from previous lpaiv infection, by the same or a different subtype, are poorly understood. therefore, we inoculated h13n2 (a/black-headed gull/netherlands/7/2009) and h16n3 (a/black-headed gull/netherlands/26/2009) lpaivs into black-headed gulls (chroicocephalus ridibundus), thei ... | 2015 | 26339062 |
| sequencing and analysis of the complete mitochondrial genome of brown shrike, lanius cristatus (passeriformes, laniidae). | the complete mitochondrial genome of the brown shrike (lanius cristatus) was 16 821 bp in length. the accession number was kt004451 and the contents of a, t, c, and g were 31.10%(5237 bp), 25.60%(4309 bp), 28.60%(4814 bp), and 14.60%(2461 bp), respectively. gene organization and length was similar to other species of birds. it comprises of 13 protein-coding genes, 2 rrna genes, 22 trna genes and 1 control region. all protein-coding genes use the typical initiation codon atg, except for cox1 whic ... | 2016 | 26457491 |
| sequencing and analysis of the complete mitochondrial genome of rufous-tailed shrike, lanius isabellinus (passeriformes, laniidae). | the complete mitochondrial genome of the rufous-tailed shrike (lanius isabellinus) was 16 819 bp in length. the genbank accession number is kp995437 and the contents of a, t, c, and g are 31.1% (5234 bp), 25.5% (4293 bp), 28.7% (4826 bp), and 14.7% (2466 bp), respectively. gene organization and length are similar to other species of birds. it comprises 13 protein-coding genes, 2 rrna genes, 22 trna genes and a control region. all protein-coding genes use the typical initiation codon atg, except ... | 2016 | 26457722 |