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Academic literature on the topic 'Ridibundus'

Author: Grafiati
Published: 30 May 2022
Last updated: 31 May 2022

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Journal articles on the topic "Ridibundus"

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Kolenda, Krzysztof, Agnieszka Pietras-Lebioda, Sebastian Hofman, Maria Ogielska, and Maciej Pabijan. "Preliminary genetic data suggest the occurrence of the Balkan water frog, Pelophylax kurtmuelleri, in southwestern Poland." Amphibia-Reptilia 38, no. 2 (2017): 187–96. http://dx.doi.org/10.1163/15685381-00003103.

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Recent molecular studies have detected the occurrence of exotic water frog species (Pelophylaxsp.) in central and western European populations. Here, we report genetic evidence for the occurrence of the Balkan water frog,Pelophylax kurtmuelleri, in southwestern Poland. We found a high frequency of an allele of serum albumin intron-1 and a mitochondrial cytochromebhaplotype specific for this southern taxon in frogs from the Barycz river drainage system. We interpret this finding as evidence of admixture betweenP. kurtmuelleriand the localridibundus-esculentuswater frog population. The origin of the exoticP. kurtmuellerimitochondrial and nuclear alleles in southwestern Poland could be due to (i) hybridization after a human-mediated introduction ofP. kurtmuelleri, (ii) the persistence of ancestral polymorphism in central EuropeanP. ridibundus, or (iii) hybridization betweenP. kurtmuelleriandP. ridibundusin the Balkans followed by the northward expansion of admixedP. ridibundus. Identical mtDNA haplotypes found in southwestern Poland and localities on the borders between Greece, Albania and Macedonia suggest that this region harboured the source population ofP. kurtmuelleriat the studied site.
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Socha, Małgorzata, and Maria Ogielska. "Age structure, size and growth rate of water frogs from central European natural Pelophylax ridibundus-Pelophylax esculentus mixed populations estimated by skeletochronology." Amphibia-Reptilia 31, no. 2 (2010): 239–50. http://dx.doi.org/10.1163/156853810791069119.

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AbstractCentral European water frog Pelophylax esculentus (formerly known as Rana esculenta) is a natural hybrid between P. lessonae and P. ridibundus. The hybrids reproduce by hybridogenesis and usually share populations with one of the parental species. Natural ridibundus-esculentus (R-E) mixed populations are rare. The population described herein is composed of 80% P. ridibundus and 20% P. esculentus represented by both sexes. We analyzed 159 adults and 228 juveniles. Age of adults collected from breeding sites ranged from 2 to 6 years in males and from 3 to 7 years in females of both taxa. The percentage of individuals older than 5 years was low. Average age of P. ridibundus was higher than that of P. esculentus. In P. ridibundus the average age of females was higher than that of males. In P. esculentus the difference between ages of females and males was not significant. Measurements of yearly radial growth of long bones revealed that the frogs grew intensively before reaching sexual maturity (3 years for females and 2 years for males). In the group of juveniles before I hibernation, P. esculentus were significantly bigger than P. ridibundus, however, there was no difference in body size between both taxa after I hibernation i.e., before the start of a new growth season. Mean LAG-1 diameters were significantly greater in adults P. ridibundus than in juveniles after I hibernation, but not in P. esculentus.
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Düşen, S., and M. Öz. "Helminth fauna of the Eurasian marsh frog, Pelophylax ridibundus (Pallas, 1771) (Anura: Ranidae), collected from Denizli Province, Inner-West Anatolia Region, Turkey." Helminthologia 50, no. 1 (May 1, 2013): 57–66. http://dx.doi.org/10.2478/s11687-013-0108-4.

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AbstractIn this research, a total of 298 Eurasian marsh frogs, Pelophylax ridibundus (Pallas, 1771) were collected from different localities in Denizli province (Inner-west Anatolia Region, the eastern part of Aegean Region) Turkey between 2006 and 2009 and examined for helminths. Of 262 (87.91 %) Pelophylax ridibundus samples were infected with one or more helminths. Pelophylax ridibundus harbored eight species of digeneans (Diplodiscus subclavatus, Gorgoderina vitelliloba, Gorgodera cygnoides, Pleurogenoides medians, Prosotocus confusus, Skrjabinoeces breviansa, Encyclometra colubrimurorum and Ophistoglyhe ranae), one species of cestode (Nematotaenia dispar), two species of acanthocephalans (Acanthocephalus ranae and Pomphorhynchus laevis), and six species of nematodes (Rhabdias bufonis, Oswaldocruzia filiformis, Cosmocerca ornata, Oxysomatium brevicaudatum, Eustrongylides sp. and Abbreviata sp.). P. ridibundus represents a host record for Nematotaenia dispar in Turkey.
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Kramshøj., Eric. "LARUS RIDIBUNDUS IN SPITSBERGEN." Ibis 110, no. 1 (June 28, 2008): 106. http://dx.doi.org/10.1111/j.1474-919x.1968.tb07986.x.

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Zhelev, Zhivko, Georgi Popgeorgiev, Atanas Arnaudov, Katerina Georgieva, and Nikolay Mehterov. "Fluctuating asymmetry in Pelophylax ridibundus (Amphibia: Ranidae) as a response to anthropogenic pollution in south Bulgaria." Archives of Biological Sciences 67, no. 3 (2015): 1009–23. http://dx.doi.org/10.2298/abs141210064z.

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The aim of this study was to investigate the integral indicator for developmental stability, the fluctuating asymmetry (FA), in the marsh frog Pelophylax ridibundus populations that inhabit biotopes of different types (running rivers and still, dam lakes), when exposed to different types of anthropogenic pollution (domestic sewage pollution and heavy metal pollution) in south Bulgaria. A total of 920 P. ridibundus individuals were used for FA analyses over three years (2009-2011). Fluctuating asymmetry was defined by 10 morphological traits, using the index frequency of asymmetric manifestation of an individual (FAMI). In closed water basins, regardless of the nature of toxicants, the FA values in P. ridibundus populations were statistically lower than those in river populations. The FA values were constantly the highest under conditions of sustained anthropogenic pollution, with high concentrations of toxicants in rivers with domestic sewage pollution and heavy-metal pollution. The results provide better opportunities to use FA in P. ridibundus populations for bioindication and biomonitoring, and for parallel and independent analyses of the physicochemical assessment of the environmental condition.
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Jośko, Paulina, and Maciej Pabijan. "Recent shifts in taxonomic compositions of water frog populations (Anura: Pelophylax) inhabiting fish ponds in southern Poland." Amphibia-Reptilia 42, no. 1 (September 29, 2020): 59–72. http://dx.doi.org/10.1163/15685381-bja10031.

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Abstract In Central Europe, water frog species coexist in assemblages consisting of Pelophylax lessonae, P. ridibundus and their hybridogenetic hybrid, P. esculentus. Population compositions are poorly understood, partly because of difficulties in distinguishing hybrids from parentals by means of morphology alone. Environmental change and human-mediated, cryptic introductions of non-native water frog species have modified local assemblages. In this contribution we examined the structure of nine water frog populations inhabiting mostly large fish ponds in the Upper Vistula river valley of southern Poland using morphology and PCR-based genotyping of single loci in the nuclear and mitochondrial genomes. We found four different water frog population compositions: two with only P. ridibundus, one composed of P. lessonae and P. esculentus, three with P. ridibundus and P. esculentus, and three containing all three water frog taxa. Historical data show that the area was previously inhabited by lessonae-esculentus populations. We propose that both ecological and genetic replacement by expanding P. ridibundus may have contributed to the decline of the former. Overall, 18% of P. ridibundus frogs contained introgressed P. lessonae mtDNA, however, the frequency of introgressants was most pronounced in populations with a high proportion of P. esculentus. Exotic water frogs were not detected in the study area. Our results bear significance for water frog population dynamics and conservation in Central Europe and highlight the importance of long-term monitoring for the detection of changes in population composition in these amphibians.
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Berger, Leszek, Maciej Pabijan, Mariusz Rybacki, and Elzbieta Czarniewska. "Large eggs and ploidy of green frog populations in Central Europe." Amphibia-Reptilia 32, no. 2 (2011): 149–58. http://dx.doi.org/10.1163/017353710x546495.

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AbstractGreen frogs of Central Europe consist of three taxa: Pelophylax ridibundus, P. lessonae and their natural hybridogenetic hybrid, P. esculentus, which forms as a rule mixed populations with its parental species. We examined 659 095 eggs from P. ridibundus (48 females), P. lessonae (133 females) and P. esculentus (170 females) originating from 39 populations in Austria, Denmark, Germany and Poland. Some females of each taxon laid eggs that fell into discrete size classes (small, medium and large). Large eggs were mostly diploid gametes from which triploids developed. They were found in P. esculentus (25 233 large eggs in 152 spawns), P. lessonae (81 in 10 spawns) and P. ridibundus (7 in 3 spawns). The main purpose of the paper was to demonstrate that the numbers of large eggs were clearly associated with triploid P. esculentus frogs. In pure hybrid (esculentus) populations large eggs comprised between 2.44-40.96% of all ova, while triploid adult frogs constituted between 13.9-73.2% of all individuals, in mixed ridibundus-esculentus populations the large eggs and triploid frogs ranged between 0.85-36.6% and 9.2-56.2%, respectively. However, in mixed lessonae-esculentus populations large eggs comprised only 1.74% of the spawns, whereas triploid frogs represented 2.1% of the adults in the population.
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Paunescu, Alina, Irina Fierascu, Radu Claudiu Fierascu, Cristina Maria Ponepal, Cristina Mihaescu, and Liliana Cristina Soare. "Histopathological Alteration on Marsh Frog Skin Induced by the Action of Dual Gold 960EC Herbicide." Proceedings 29, no. 1 (October 21, 2019): 124. http://dx.doi.org/10.3390/proceedings2019029124.

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Lukanov, Simeon, Georgi Popgeorgiev, and Nikolay Tzankov. "First bioacoustic and morphological data for the presence of Pelophylax bedriagae in Bulgaria." Acta Scientifica Naturalis 5, no. 1 (March 1, 2018): 54–63. http://dx.doi.org/10.2478/asn-2018-0008.

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AbstractWater frog mating calls from two localities were studied and analyzed. Recordings were made in the summer of 2010 at the Arkutino swamp near the town of Primorsko and at the Vurbitza River near the town of Momchilgrad. A total of 154 calls were analyzed and the results suggested the presence of both the Marsh frog (Pelophylax ridibundus) and the Levant frog (Pelophylax bedriagae) in both sites, with the former being more frequent in Vurbitza River, and the latter – in Arkutino. At Vurbitza, we also captured and measured 2 specimens, which morphological characteristics differed from P. ridibundus and matched those of P. bedriagae. These are the first localities for P. bedriagae in Bulgaria.
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Suriadna, N. M., G. I. Mykytynets, M. Pupiņš, and V. Y. Gasso. "Population systems of Eurasian water frogs (Pelophylax) in the south of Ukraine." Biosystems Diversity 28, no. 2 (May 30, 2020): 154–62. http://dx.doi.org/10.15421/012021.

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Ecological and evolutionary consequences of population-genetic processes that occur because of natural cross-species hybridization can show mechanisms of overcoming the reproductive barrier and obtaining the species status by a hybrid taxon. This is clearly seen in the population systems of Eurasian water frogs – Pelophylax esculentus complex. The P. esculentus (E) hybrid usually discards one of the parental genomes of P. lessonae (L) or P. ridibundus (R) and reproduces semi-clonally. The genetic structure and direction of gene flows precisely depend on the type and distribution of mixed or pure population systems of water frogs. Three population systems in the south of Ukraine were identified and confirmed as RR, RE and REL. The populations of P. ridibundus are most common (76.2%). A mixed population systems of P. ridibundus and P. esculentus (20.0%) are concentrated in the floodplains of large rivers where triploids were found and the unisexual hybrids (1.0♂ : 0.1♀) were proved. Parent species populations having different ploidy of P. esculentus such as 3n and for the first time 4n were found. A mixed system of three taxa (REL) is rare (3.8%) and locally concentrated in the lower Danube and Dnieper with the smallest proportion of P. lessonae. We did not find populations of P. lessonae (LL), P. esculentus (EE, very rare system of hybrids only), and two mixed populations of parental species RL and semi-clonal LE in the south of Ukraine, but they are known for northern areas. The high number of P. ridibundus tends to decrease; the scarce P. esculentus and the extremely rare P. lessonae require special conservation measures. P. ridibundus (RR) occupies a wide range of diverse natural, permanent, temporary, coastal, continental, and artificial freshwater bodies, including synanthropic ecosystems. Mixed population systems inhabit willow and poplar forests in the floodplains of large rivers. In the south of Ukraine rare and isolated populations of the water frogs occurring outside the main range can be relict. Biotopic preferences, ratio and number of constituent taxa are crucial for an adequate assessment of biological (taxonomic) diversity and development of an appropriate strategy for the population systems’ conservation. Such characteristics as unisexuality of hybrids, their spreading patterns, specific sex structure and ploidy in different population systems of the P. esculentus complex contribute to the understanding of the hybridogenetic dynamics; produce new tendencies of becoming independent hybridogenous taxa and emergence of new evolutionary relationships.
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Dissertations / Theses on the topic "Ridibundus"

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Hesp, Lee. "Age-related foraging behaviour in the black-headed gull (Larus ridibundus)." Thesis, University of Nottingham, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.238231.

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Pickard, Kirsty. "Heavy metal pollution and blackheaded gull (Larus ridibundus L.) breeding ecology." Thesis, University of Southampton, 2010. https://eprints.soton.ac.uk/196435/.

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Heavy metals in air, soil and water are a global problem and present a growing threat to the environment. These metals may have profound consequences for birds and can cause a number of sub-lethal effects, such as decreased reproductive success. The concentrations of selected heavy metals (As, Cd. Co, Cu, Fe, Pb, Mn, Ni, V, Zn) and Se in eggs and feathers from populations of black-headed gulls (Larus ridibundus L.) located on different colonies in the UK, which have different characteristics and are subject to different sources, types and degrees of pollution, were examined. Concentrations of As, Cu, Pb, Ni, Se and V measured in black-headed gull eggs were consistently high relative to those reported in previous field studies with other gull species. However, no significant effect was observed on the egg characteristics in terms of egg size and dimensions, shell thickness and index as a result of concentrations of metals measured in this study. Concentrations of Co, Fe and Ni were significantly negatively correlated with yolk:albumen ratio in the egg. The usefulness of sampling eggs to provide a reflection of local contamination has been demonstrated, with concentrations related to local sources of metal pollution and site differences reflected in sediment concentrations from previous studies. The importance of taking into account diffuse and historical pollution in addition to point source discharges has also been highlighted. As, Fe, Mn, Pb, Se, V and Zn were found at significantly higher concentrations in egg contents than egg shell, and Cd, Co and Ni concentrations were higher in shell than contents. Cu was distributed approximately equally. Within the egg contents, concentrations of As, Cu, Se and V were higher in the albumen than in the yolk, and Co, Fe, Mn, Ni, Pb and Zn concentrations were higher in the yolk than the albumen. Cd was found mainly in the shell and concentrations in egg contents were largely undetectable. Comparisons were made between a colony subject to high-level commercial egg harvesting and an un-harvested site, and between pre- and post-harvesting eggs on the harvested site. Postcollection eggs were found to be of significantly lower quality than the pre-collection eggs and the eggs from the uncollected site, as indicated by yolk:albumen ratio. Concentration of metals in eggs as a result of relaying forced by commercial harvesting has been demonstrated, with concentrations of Co, Fe and Ni significantly higher in post-collection eggs compared to precollection eggs. Average nesting density was significantly lower on the collected colony than the uncollected colony. No effect on egg size was found as a result of changes in nesting density. Concentrations of metals in black-headed gull chick down were measured and compared to egg data in order to assess the usefulness of feathers as a tool for non-destructive monitoring of metal pollution. The results suggest that feathers may be good indicators for As and Zn, and possibly also for Mn and Ni. However, the sample masses were very small and for a number of metals concentrations were largely undetectable using the analytical equipment available in this study. Future work with larger samples of down would be prudent to further examine the use of chick down to provide an indication of the level of pollution to which birds are exposed. The importance of using appropriate washing procedures to remove exogenous contamination of feathers to assess internal concentrations has been demonstrated
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McCulloch, Fiona M. "Reproductive behaviour in a small inland colony of black-headed gulls (Larus ridibundus)." Thesis, University of St Andrews, 1990. http://hdl.handle.net/10023/15061.

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This study was carried out over three breeding seasons at a small marsh-nesting black-headed gull (Larus ridibundus) colony. Two of the years proved to be atypically hot and dry, resulting in the drying out of parts of the colony. This facilitated predation by foxes and resulted in almost complete breeding failure in these two years. Synchronisation of breeding was evident but the average clutch size was smaller than generally recorded for black-headed gulls. There was a tendency for third laid eggs and third hatched chicks to have the highest mortality rate, and third hatched chicks put on less weight during their first three days of life than all other chicks. Pairs of gulls that did not successfully retain their territories and lay eggs spent less time on the territory than those that were successful. The unsuccessful males were also more restless and more aggressive than successful males. In general, the gulls spent most time on the territory during the incubation stage, although partners spent the most time together on the territory during the pre-egg stage. The territory was never left unattended during the incubation stage, but it was occasionally deserted during the pre-egg stage, and increasingly deserted as the chick stage proceeded. In one year, but not another, males spent most time on the territory and incubating during the egg stage, while females spent most time on the territory and brooding during the chick stage. The gulls were most aggressive during the pre-egg stage and least aggressive during the incubation stage, and the males played the greater role in defence during the pre-egg and egg stages. The sexes shared equally the feeding of the chicks and became less eager to feed the chicks as they grew. The number of feeds given per hour per chick decreased with increasing brood size.
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Francesiaz, Charlotte. "Sélection d'habitat et dynamique spatio-temporelle des colonies chez deux espèces de laridés : la mouette rieuse et le goéland railleur." Thesis, Montpellier, 2016. http://www.theses.fr/2016MONTT129/document.

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La dynamique des populations vise à étudier les processus qui déterminent les fluctuations spatio-temporelles des effectifs d’organismes vivants. Ma thèse vise à caractériser les relations entre trois niveaux d’organisation des populations d’oiseaux coloniaux, l’individu, la colonie et la méta-colonie, et à étudier l’influence de l’environnement physique et social sur cette organisation. A cette fin, je me suis concentrée sur deux espèces de laridés coloniaux aux dynamiques de populations contrastées: la mouette rieuse, Chroicocephalus ridibundus, et le goéland railleur, Chroicocephalus genei. J’ai décrit, dans un premier temps, la dynamique spatio-temporelle des colonies de goélands railleurs en France, dont la répartition tend à s’étendre le long de la côte Méditerranéenne. Malgré cette expansion, les individus nés en France restent fidèles à leur région natale, mais leur âge et leur sexe modulent leur recrutement et leur comportement de dispersion. J’ai affiné ce premier travail en montrant que la condition corporelle des poussins, paramètre majeur du recrutement, est modulée par la taille des colonies, sa date d’installation et la stratégie d’alimentation des parents. Mes travaux ont de plus permis de montrer l’existence de groupes sociaux chez le goéland railleur, dont la stabilité est modulée par le succès de reproduction de la colonie. Ainsi, le degré de relations entre les individus d’une colonie est modulé par les caractéristiques intrinsèques de la colonie et son contexte environnemental. J’ai en particulier montré, chez la mouette rieuse, que la persistance des colonies dépend du succès de reproduction local, mais que la colonisation de nouveaux sites dépend plutôt du succès de reproduction dans les colonies avoisinantes. Mes travaux montrent ainsi que l’ensemble des niveaux d’organisation des populations d’oiseaux coloniaux, de l’individu à la méta-colonie, doivent être étudiés à travers de nouvelles approches intégratives qui représentent des challenges conceptuels, méthodologiques et techniques à l’interface entre dynamique des populations et étude des réseaux sociaux
Population dynamics addresses the processes that underpin the spatio-temporal fluctuations of organism counts. My PhD dissertation aims at characterizing the connections between three organization levels in colonial bird populations, the individual, the colony, and the meta-colony, and at investigating the influence of the physical and social environments on this organization. To this aim, I focused on two colonial larid species that exhibit contrasted population dynamics: the black headed gull, Chroicocephalus ridibundus, and the slender-billed gull, Chroicocephalus genei. I first described the population dynamics of french slender-billed gull colonies, which are currently spreading along the Mediterranean coast. In spite of this expansion, individuals born in France return to their natal area to breed, but their age and sex modulate their recruitment and dispersal behaviours. I added-up to this first results by showing that nestling body condition, a major factor for recruitment, is affected by colony size, arrival date and parental foraging strategy. I further showed that slender-billed gulls gather into social groups whose stability is modulated by colony breeding success. The strength of inter-individual relationships within a colony is thus modulated by its intrinsic properties and its environmental context. Furthermore, I showed that, in black-headed gulls, colony persistance varies with local breeding success while colonization of new sites is mainly related to breeding success in neighbouring colonies. I conclude overall that the multiple organization levels of colonial bird populations, from the individual to the meta-colony, should be studied within integrative frameworks that represent novel conceptual, methodological and technical challenges at the crossroad between population dynamics and the study of social networks
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Jones, M. J. "Aspects of the ecology and behaviour of black-headed (Larus ridibundus) and common gulls (Larus canus) on urban grassland." Thesis, University of Manchester, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.356108.

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MacKinnon, Gabriela Elisabeth. "Aspects of the ecology of the black-headed gull (Larus ridibundus) with comparative data on the common gull (L. canus)." Thesis, Durham University, 1987. http://etheses.dur.ac.uk/6857/.

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Between 1982 and 1984, 893 Black-headed and 117 Common Gulls were trapped outside the breeding season in northeast England, and individually marked with wingtags or colour-rings. About 40% of marked adult Black-headed and Common Gulls returned to the study area in subsequent years, although adult Black-headed Gulls marked at the coast in the 1982-83 season returned in considerably higher proportions. Proportionately fewer second-year and first-year birds returned than adults. These percentages are considerably lower than the estimated annual survival rate for Black-headed Gulls, showing that some of the birds probably spent subsequent winters outside the study area. Some of the birds which did not return to the study area were recovered or seen elsewhere, mainly in eastern parts of Britain: few moved to the west coast. Foreign Black-headed Gulls which overwintered in the British Isles were most numerous compared to British birds in the south and east of the British Isles. A small proportion of Continental Black-headed Gulls remained in Britain during the breeding season: the consequences of these birds joining the British breeding population are discussed. Overwintering Black-headed Gulls in the study area were observed feeding inland on fields and refuse tips, and at the coast. First-years were uncommon compared to adults at the coast, less so on tips, and were relatively most common on fields. Females made up similar proportions of flocks at the coast and on inland fields, but were excluded to some extent from tips. Neither the survival rates of adult and ■ first-year British Black-headed Gulls, nor the weights of adult Black-headed Gulls caught in northeast England, were usually affected by the severity of weather in winter. The migrations and movements of Black-headed Gulls are discussed and compared to those of other species.
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Grosbois, Vladimir. "La dispersion : trait d'histoire de vie et paramètre démographique : étude empirique dans une population de mouette rieuse Larus Ridibundus L." Montpellier 2, 2001. http://www.theses.fr/2001MON20151.

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Allaine, Dominique. "Le Rôle de la structure de colonie dans la biologie des populations d'oiseaux exemple de la mouette rieuse (Larus ridibundus) en Forez /." Grenoble 2 : ANRT, 1988. http://catalogue.bnf.fr/ark:/12148/cb376112429.

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Allainé, Dominique. "Le rôle de la structure de colonie dans la biologie des populations d'oiseaux : exemple de la mouette rieuse (Larus ridibundus) en Forez." Lyon 1, 1988. http://www.theses.fr/1988LYO10177.

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Péron, Guillaume. "Dynamique des populations : apport de la modélisation intégrée à l’échelle du paysage et de la prise en compte de l’hétérogénéité individuelle dans les modèles de capture-recapture." Montpellier 2, 2009. http://www.theses.fr/2009MON20076.

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Entre l’échelle locale et l’échelle du paysage (plusieurs populations connectées) la dynamique de population peut varier d’un extrême à l’autre. Au cours de cette thèse je me suis intéressé à deux méthodes permettant de mieux détailler les dynamiques locales et régionales d’une population multi-colonie de mouettes rieuses Chroicocephalus ridibundus où l’on suit le devenir d’individus marqués. Les modèles intégrés de population combinent les informations issues des comptages à l’échelle régionale, et les données issues de capture(recapture d’individus marqués, pour obtenir des estimations précises des paramètres démographiques, notamment les taux de transferts entre différents sites. Cette méthode a permis de mettre en évidence l’effet de la taille des colonies sur la démographie : émigration des jeunes, âge de première reproduction, attraction des adultes. Ce patron de variation indique que la compétition entre individus est non négligeable sur les colonies les plus grandes. Dès lors, on pouvait attendre une hétérogénéité entre individus, liée à la capacité compétitrice, qui s’ajoute aux autres sources de variations connues. Les modèles multiévènement permettent d’accommoder cette hétérogénéité de source multiple dans le double but d’obtenir des modèles bien ajustés aux données, pouvant servir de base à des tests fiables d’hypothèses biologiques, et de corriger les biais liés à l’hétérogénéité individuelle. Je me suis intéressé à l’étude de la sénescence, le déclin du taux de survie avec l’âge, qui a donné lieu à une application des modèles multiévènement et à une analyse comparative incluant 72 espèces d’oiseaux et de mammifères
Between the local and the landscape scales (several connected populations), population dynamics can vary from one extreme to the other. During this thesis work I was interested in two methods that provide more insight into the local and regional dynamics of a population of black-headed gull Chroicocephalus ridibundus studied by capture-recapture of marked individuals. Integrated population models combine the information from population surveys at the landscape scale and information from capture-recapture data, in order to obtain precise estimates for the demographic parameters, in particular the transfer rates between different sites. This method made it possible to prove the effect of the colony size on demography: emigration of young individuals, age at first reproduction, and attraction of adults. This pattern indicates that intra-specific competition is non-negligible on the largest colonies. From then on, one could expect individual heterogeneity, due to competitive ability, which adds to the sex-biased dispersal effect. It is possible to accommodate this heterogeneity of multiple origin using multievent models, in order to obtain well-fitted models, which can be used as a basis for further hypothesis testing, and to simultaneously correct for the bias induced by individual heterogeneity. I worked on senescence, the decline in survival with age, with an application of multievent models and a comparative analysis across 72 species of birds and mammals
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Book chapters on the topic "Ridibundus"

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"Black-headed Gull. Chroicocephalus ridibundus." In Gulls of Europe, North Africa, and the Middle East, 50–53. Princeton University Press, 2022. http://dx.doi.org/10.1515/9780691230498-010.

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Conference papers on the topic "Ridibundus"

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Gherasim, Elena, Dumitru Erhan, Stefan Rusu, Ion Gologan, Liubovi Lebedenco, Anastasia Ivanova, Andrei Cebotari, and Dmitri Vatavu. "Diversitatea faunei helmintice a speciei Pelophylax Ridibundus (Amphibia, Ranidae) în funcție de factorii sezonieri." In International symposium ”Functional ecology of animals” dedicated to the 70th anniversary from the birth of academician Ion Toderas. Institute of Zoology, Republic of Moldova, 2019. http://dx.doi.org/10.53937/9789975315975.41.

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Snegin, Eduard, Anatoliy Barkhatov, and Elena Snegina. "Analysis of the Genetic Structure of the Populations of Marsh Frog (Pelophylax Ridibundus) in the Impact Territories of the City of Belgorod on the Basis of Microsatellite Markers of DNA." In Proceedings of the 1st International Symposium Innovations in Life Sciences (ISILS 2019). Paris, France: Atlantis Press, 2019. http://dx.doi.org/10.2991/isils-19.2019.72.

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Cozari, Tudor, and Elena Gherasim. "Complexul ranidelor verzi – model de formare a unor specii de amfibieni pe cale hibridogena." In Impactul antropic asupra calitatii mediului. Institute of Ecology and Geography, Republic of Moldova, 2019. http://dx.doi.org/10.53380/9789975330800.18.

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This article reflects a theoretical - synthetic analysis with systematic, morphological and ecological aspects of frogs (Amphibia: Ranadae): Rana ridibunda Pallas, 1771, Rana lessonae Camerano, 1882 and Rana kl. Esculenta Linnaeus 1785, as well as the representation of a training model for the formation of new hybridized amphibian species. These mentioned species form a complex of frogs (Rana kl.esculenta complex), consisting of the parent species Rana lessonae Cam. and Rana ridibunda Pal. and species resulting from the hybridization process - Rana kl. esculenta L. The hybrid R. kl. esculenta, presents not only a result of the parental species, but its existence is also ensured, by the subsequent hybridization with one of the parental species.
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Cozari, Tudor, and Elena Gherasim. "Structura dimensională a reproducătorilor speciei Rana Ridibunda din ecosistemele Codrilor centrali." In International symposium ”Functional ecology of animals” dedicated to the 70th anniversary from the birth of academician Ion Toderas. Institute of Zoology, Republic of Moldova, 2019. http://dx.doi.org/10.53937/9789975315975.07.

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Gherasim, Elena, Dumitru Erhan, and Stefan Rusu. "Establishing the role of amphibians (Anura) in the prophylaxis of helminths specific to domestic, wild and pet animals." In Xth International Conference of Zoologists. Institute of Zoology, Republic of Moldova, 2021. http://dx.doi.org/10.53937/icz10.2021.33.

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This work is based on helminthological data of amphibians, collected since 2013 until 2020, in the Republic of Moldova. The investigations on anura amphibians were conducted in the laboratory of Parazitology and Helminthology of the Institute of Zoology. One of the most common parasitic diseases in ruminants is fasciolosis, caused by the trematode Fasciola hepatica species. The results of parasitological research showed that adult cattle were infected with fascioles in 66.4% of cases, and young cattle - in 46.1% of cases. This is largely due to the grazing of animals of different species and ages in limited areas.The presence of the trematode species Haplometra cylindracea was established in 78% of cases in the amphibians in the Ranidae and Bufonidae families (Rana ridibunda, Rana lessonae, Rana temporaria, Bufo viridis). The results of laboratory helminthological investigations have shown that the relationships between the Fasciola hepatica miracidium and the Haplometra cylindracea miracidium are antagonistic. Amphibians of the Ranidae and Bufonidae families (Rana ridibunda, Rana lessonae, Rana temporaria, Bufo viridis) infested with Haplometra cylindracea tremateda may play an important role in the prophylaxis of fasciolosis.
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Bislimi, Kemajl. "THE SERUM BIOCHEMICAL PARAMETERS CHANGES IN THE FROG RANA RIDIBUNDA PALL. AT DIFFERENT WATER TEMPERATURE REGIMES." In 14th SGEM GeoConference on NANO, BIO AND GREEN � TECHNOLOGIES FOR A SUSTAINABLE FUTURE. Stef92 Technology, 2014. http://dx.doi.org/10.5593/sgem2014/b61/s25.078.

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