| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| hatching date influences age at first reproduction in the black-headed gull. | in long-lived colonial birds, age at recruitment is an important life-history character. variation in this parameter may reflect differences in several factors, including competitive ability and breeding strategies. further, these differences may be due to timing of hatching (for instance through differences in competitive ability). we investigated the age of first-time breeders in relation to hatching date in a black-headed gull larus ridibundus colony situated in central france, from 1979 to 1 ... | 2001 | 28547170 |
| 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 |
| 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 |
| 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 |
| 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 |
| the radiation exposure of black-headed gulls (larus ridibundus) in the ravenglass estuary, cumbria, u.k.: a preliminary assessment. | a variety of fission-product and transuranic radionuclides originating from the marine discharges from the fuel reprocessing plant at sellafield, cumbria are detectable in the bodies of black-headed gulls and their environment in the ravenglass estuary approximately 10 km to the south-west of the plant. the maximum concentrations of 95nb, 137cs and 239/240pu detected in body tissues lie in the range 2 x 10(-3) to 1.5 x 10(-2) bqg-1 wet weight. many more radionuclides are detected in the regurgit ... | 1986 | 3823858 |
| flock-feeding on fish schools increases individual success in gulls. | flock-foraging and the role of white plumage in gulls and other seabirds have been the subject of much debate. at first sight it seems that competition within the flock would render flock formation against the interest of the bird who finds the fish school, as the fish must then be shared with birds joining the flock. however, it is also possible that flock formation is neutral or even beneficial to the individual members, including the bird that found the fish (the 'first finder'). here we show ... | 2006 | 3945345 |
| on the occurrence of argyrophil and fluorescent cells in the ultimobranchial body of larus ridibundus (l.). | | 1977 | 409050 |
| mucopolysaccharide histochemistry of the avian tongue. histochemical features of the lingual glands in larus ridibundus (l). | from the histochemical analysis carried out on the tongue of larus ridibundus (l.), it has been possible to establish that it is covered by thick stratum corneum on the dorsal surface and shows both in the anterior and posterior portions lingual glands, which histologically consist of aggregates of branched tubules. these glands exhibit identical histochemical reactions which show the presence of neutral mucopolysaccharides, sulfated and unsulfated acid mucosubstances and hyaluronidase-resistant ... | 1977 | 145782 |
| [morphogenesis of the osteocranium of larus ridibundus l.: comparative study based on reconstruction models and elucidation preparations]. | | 1972 | 4658034 |
| [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 |
| factors affecting element concentrations in eggshells of three sympatrically nesting waterbirds in northern poland. | avian eggshells are convenient samples in biomonitoring studies, because they are easily accessible, especially from colonially or semicolonially breeding birds. in the present study, concentrations of 17 elements, including heavy metals and essential elements in post-hatch eggshells, were compared among three species of waterbirds of differing strategies for gaining reserves for egg production and diet: mallard, anas platyrhynchos (ml, a capital breeder, mainly herbivorous), common tern, sterna ... | 2018 | 29170796 |
| avian influenza virus surveillance in south-central spain using fecal samples of aquatic birds foraging at landfills. | aquatic wild birds have been intensively studied to better understand their role in avian influenza virus (aiv) maintenance and spread. to date, aiv surveillance has primarily focused on natural aquatic environments where different bird species aggregate and viral survival is enhanced. however, artificial habitats such as landfills are attracting substantial numbers of wild birds, aiv reservoir species included. the use of landfills as a predictable food source has significantly influenced popul ... | 2017 | 29124060 |
| human noroviruses attach to intestinal tissue of a broad range of animal species. | human noroviruses are the most common non-bacterial cause of gastroenteritis outbreaks with new variants and genotypes frequently emerging. the origin of these new viruses is unknown; however, animals have been proposed as a potential source as human noroviruses have been detected in animal species. here we investigated the potential of animals to serve as reservoir of human noroviruses, by testing noroviruses attachment to formalin-fixed intestinal tissues of a range of potential reservoir anim ... | 2020 | 33115870 |
| carriage and potential long distance transmission of listeria monocytogenes by migratory black-headed gulls in dianchi lake, kunming. | listeria monocytogenes is a high risk pathogen which can cause invasive diseases in humans. we previously reported that black-headed gulls from dianchi lake of kunming carrying l. monocytogenes, while the characteristics of these isolates and the relationship with habitats of migratory gulls have not been explored. in this study, we investigated the prevalence and molecular characteristics of listeria monocytogenes from black-headed gulls in dianchi lake, and phylogenetic analysis based on core ... | 2019 | 31393224 |
| characteristics of microbial communities and intestinal pathogenic bacteria for migrated larus ridibundus in southwest china. | larus ridibundus, a migratory wild bird, has become one of the most popular gull species in southwest china in recent years. there has been no information on the gut microbiota and intestinal pathogenic bacteria configuration in wild l. ridibundus, even though the public are in close contact with this bird. in this study, 16s rrna amplicon-sequencing methods were used to describe the microbial community structure and intestinal pathogenic bacteria were isolated to identify their characteristics. ... | 2019 | 29978594 |
| mercury exposure in birds linked to marine ecosystems in the western mediterranean. | mercury (hg), particularly as methylmercury (mehg), is a nonessential, persistent, and bioaccumulative toxic element with high biomagnification capacity and is considered a threat to marine environments. we evaluated total hg concentrations in liver, kidney, and brain in 62 individuals of 9 bird species linked to marine ecosystems from western mediterranean admitted in a wildlife rehabilitation center (wrc) (alicante, spain, 2005-2020). age- and sex-related differences in hg levels, as well as t ... | 2020 | 33106911 |
| the effects of migration on the immunity of black-headed gulls (chroicocephalus ridibundus: laridae). | in order to elucidate the relationship between migration period and immunity related to susceptibility, we conducted research on black-headed gulls (chroicocephalus ridibundus). we captured 260 gulls and collected their peripheral blood. their leukocyte (wbc) count, percentages of heterophils (het) and lymphocytes (lym), heterophil and lymphocyte ratio (h/l ratio), and cd4 and cd8α expression levels (cd4 and cd8α, respectively) were quantitatively analyzed over three migration periods (autumn mi ... | 2020 | 32963148 |
| postnatal ossification sequences in acrocephalus scirpaceus and chroicocephalus ridibundus (aves: neognathae): the precocial-altricial spectrum and evolution of compound bones in birds. | although the development of the avian skeleton has attracted considerable attention, most of the studies have been concentrated on the embryonic period, while studies on the postnatal period are rare. we studied the postnatal development of the skeleton in two phylogenetically distant birds, an altricial passerine acrocephalus scirpaceus and a semiprecocial charadriiform chroicocephalus ridibundus. the neonates of the former, despite being altricial, have well-ossified skeleton-the degree of dev ... | 2020 | 32875600 |
| intercolony variation in foraging flight characteristics of black-headed gulls chroicocephalus ridibundus during the incubation period. | using gps loggers, we examined the influence of colony, sex, and bird identity on foraging flight characteristics of black-headed gulls chroicocephalus ridibundus during the incubation period. we studied tracks of 36 individuals breeding in one urban and two rural colonies in poland. birds from both rural colonies performed the furthest flights (mean max distance 8-12 km, up to 27 km) foraging mainly in agricultural areas. gulls from the urban colony performed shorter flights (mean 5 km, up to 1 ... | 2020 | 32607169 |
| relationship between blood test values and blood lead (pb) levels in black-headed gull (chroicocephalus ridibundus: laridae). | few studies have evaluated immunosuppression due to lead accumulation below the overt toxicity threshold. if low levels of lead accumulation cause immunosuppression in birds, those birds could become more susceptible to pathogens. we aimed to determine if low levels of lead accumulation lead to immunosuppression in black-headed gulls (chroicocephalus ridibundus). gulls were captured in tokyo-bay and mikawa-bay from january to april 2019. their blood samples were analyzed for eight items. the dat ... | 2020 | 32565496 |
| low occurrence of acinetobacter baumannii in gulls and songbirds. | acinetobacter baumannii is a worldwide occurring nosocomial pathogen, the natural habitats of which remain to be defined. recently, white stork nestlings have been described as a recurring source of a. baumannii. here, we challenged the hypothesis of a general preference of a. baumannii for avian hosts. taking advantage of campaigns to ring free-living birds, we collected cloacal swab samples from 741 black-headed gulls (chroicocephalus ridibundus) in poland, tracheal and cloacal swabs from 285 ... | 2020 | 32162853 |
| systemic collapse of a host-parasite trematode network associated with wetland birds in europe. | as host community diversity decreases, parasite diversity may also decline. the life cycles of trematodes involve multiple hosts from different orders, with many trematodes displaying narrow host specialization. in the 1960s and 2010s, we performed full-body necropsies of juvenile or first-year birds of four wetland bird species, anas platyrhynchos, aythya fuligula, fulica atra, and chroicocephalus ridibundus which originated from the southern czech republic, and examined them for the presence o ... | 2020 | 32088756 |
| relaxation of selective constraints shapes variation of toll-like receptors in a colonial waterbird, the black-headed gull. | nonspecific innate immune response is activated by toll-like receptors (tlrs), which recognize conserved molecular motifs characteristic for a broad spectrum of pathogens. in this study, we examined nucleotide substitution patterns and allelic diversity at five tlr genes in a wild nonpasserine bird, the black-headed gull chroicocephalus ridibundus. we hypothesized that balancing selection can maintain high allelic diversity of tlr genes in the black-headed gull because of its ecological characte ... | 2020 | 31996941 |
| comparative analysis of intestine microbiota of four wild waterbird species. | waterbirds are ubiquitous and globally distributed. yet, studies on wild waterbirds' gut microbiota are still rare. our aim was to explore and compare the gut microbial community composition of wild waterbird species. four wild waterbird species that are either wintering or all-year residents in israel were studied: great cormorants, little egrets, black-crowned night herons and black-headed gulls. for each bird, three intestinal sections were sampled; anterior, middle and posterior. no signific ... | 2019 | 31481943 |
| new evidence for the east-west spread of the highly pathogenic avian influenza h5n1 virus between central asian and east asian-australasian flyways in china. | the spread of highly pathogenic avian influenza (hpai) h5n1 virus is associated with wild fowl migration in east asian-australasian (ea) and central asian (ca) flyways. however, the spread of h5n1 virus between the two flyways is still unclear. here, the movements of wild waterfowl were obtained from satellite tracking data covering seven bar-headed geese and three great black-headed gulls breeding in the qinghai lake area (along the ea flyway), and 20 whooper swans wintering in the sanmenxia re ... | 2019 | 31164049 |
| [molecular-genetic characterization of avian avulavirus 20 strains isolated from wild birds.] | previously unknown paramyxovirus strains were isolated from wild birds in 2013-2014 in kazakhstan and subsequently identified as representatives of the novel avian avulavirus 20 species. the aims and tasks were molecular genetic characterization of novel avulaviruses and investigation of their phylogenetic relationships. | 2019 | 32163685 |
| black-headed gulls synchronise their activity with their nearest neighbours. | animals in groups can benefit from synchronising their behaviour, where multiple individuals conduct similar activities at the same moment in time. previous studies have demonstrated that some species show synchronisation of vigilance behaviour, but have not explored the mechanism driving this behaviour. synchronisation could be driven by animals copying their closest neighbours, which would mean that close proximity should lead to increased synchronisation. we simultaneously observed the behavi ... | 2018 | 29967446 |
| wild waterfowl as potential vectors of vibrio cholerae and aeromonas species. | to study the hypothesis that migratory waterfowl are possible disseminators of vibrio cholerae and aeromonas. | 2018 | 29733476 |
| pathogen presence in wild birds inhabiting landfills in central iran. | wild birds are important in the transmission of many zoonotic pathogens such as salmonella and avian influenza virus (aiv). the current study investigated the presence of bacterial and viral pathogens in birds foraging at an open landfill located in central iran. we collected blood and intestinal samples from five abundant species, including rook (corvus frugilegus), european starling (sturnus vulgaris), house sparrow (passer domesticus), black-headed gull (chroicocephalus ridibundus) and slende ... | 2021 | 33783651 |