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Letteratura scientifica selezionata sul tema "Hamster commun – Conservation"

Autore: Grafiati

Pubblicato: 22 febbraio 2025

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Articoli di riviste sul tema "Hamster commun – Conservation"

Banaszek, Agata, Joanna Ziomek e Katarzyna Jadwiszczak. "Morphometric Differences Between the Phylogeographic Lineages of the Common Hamster Cricetus Cricetus in Poland". Zoologica Poloniae 54-55, n. 1-4 (1 gennaio 2009): 13–20. http://dx.doi.org/10.2478/v10049-010-0002-2.

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Morphometric Differences Between the Phylogeographic Lineages of the Common Hamster Cricetus Cricetus in Poland As the common hamster is endangered in the European part of its range, it is necessary to define the conservation units for successful management of natural populations. Here we describe the case of clear morphometric differentiation between phylogeographic lineages of the common hamster. The standard external measurements were taken from 209 common hamsters collected during the period 2005-2007 from the present species range in Poland. The studied populations belong to different phylogeographic lineages P3 (Polish Pannonia) and E1, and the hamsters of P3 lineage are smaller with longer feet and tails than the hamsters of E1 lineage. The phylogeographic lineages of the common hamster can be defined as evolutionary significant units (ESU) due to the significant genetic differentiation and as management units (MU) with the evidence for ecological differentiation.

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Feoktistova, Natalia Yu, Alexey V. Surov, Nikolay N. Tovpinetz, M. V. Kropotkina, Pavel L. Bogomolov, Carina Siutz, Werner Haberl e Ilse E. Hoffmann. "The common hamster as a synurbist: a history of settlement in european cities". Zoologica Poloniae 58, n. 3-4 (1 dicembre 2013): 116–29. http://dx.doi.org/10.2478/zoop-2013-0009.

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Abstract Following the expansion of agriculture in the Neolithic period, the common hamster has spread throughout Europe, and occurred abundantly until the recent past. However, in the last 45 years, populations declined markedly, partly attributable to urbanization and to major changes in agricultural practices. As a result, the species has been considered endangered at international levels as well as in most European countries. At the same time, the species has established populations in large Central and Eastern-European cities such as Vienna (Austria), Simferopol (Ukraine) and Nalchik (Russia), where it inhabits green spaces such as parks, gardens, embankments and buffer strips. In an attempt to reveal factors enabling hamsters to cope with urban environments, we reviewed historical data and habitat conditions of several urban hamster populations. We suggest that supplemental food resources and reduced predation pressure were the main factors promoting urban occurrence of common hamsters in the last 30 years. Its notable adaptability may be associated with higher stress resilience, ecological opportunism, polyphagy and higher fertility compared to species relying on non-urban habitats. The phenomenon of synurbization implies coexistence of wildlife and our urban civilization, but at the same time conflicting interests in conservation and urban development. Thus, the common hamster might serve as a model species for efficient mitigation and compensation concepts in urbanism and spatial planning.

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Tissier, Mathilde Louise, Florian Kletty, Jean-Patrice Robin e Caroline Habold. "Sustainable Agriculture: Nutritional Benefits of Wheat–Soybean and Maize–Sunflower Associations for Hibernation and Reproduction of Endangered Common Hamsters". Sustainability 13, n. 24 (7 dicembre 2021): 13521. http://dx.doi.org/10.3390/su132413521.

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Farmland species face many threats, including habitat loss and malnutrition during key periods of their life cycle. This is aggravated in conventionally managed monocultures, leading to nutrient deficiencies that impair the survival and reproduction of farmland wildlife. For instance, protein deficiencies in wheat or vitamin B3 deficiency in maize reduce by up to 87% the reproductive success of the critically endangered common hamster (Cricetus cricetus), a flagship species of European farmlands. It is urgent to identify and implement agricultural practices that can overcome these deficiencies and help restoring hamsters’ reproductive success. As part of a conservation program to diversify farming habitats in collaboration with farmers, we tested whether associations between wheat or maize and three supplemental crops (soybean, sunflower and fodder radish) supported hamsters’ performance during hibernation and reproduction. We observed that maize–sunflower, maize–radish and wheat–soybean associations minimized hamsters’ body mass loss during hibernation. The wheat–soybean association led to the highest reproductive success (N = 2 litters of 4.5 ± 0.7 pups with a 100% survival rate to weaning), followed by maize–sunflower and maize–radish. These crop associations offer promising opportunities to overcome nutritional deficiencies caused by cereal monocultures. Their agronomic potential should promote their implementation on a large scale and benefit farmland biodiversity beyond the common hamster.

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Zaytseva, E. A., A. Yu Tsellarius, P. L. Bogomolov, A. V. Kuptsov e A. V. Surov. "Common hamster (Cricetus cricetus, Cricetidae, Rodentia) in the Simferopol city: Population dynamics and survival outlook". Povolzhskiy Journal of Ecology, n. 3 (8 ottobre 2024): 364–71. http://dx.doi.org/10.35885/1684-7318-2024-3-364-371.

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In the Simferopol city, the numbers of Common hamsters began to grow since the early 1970s and reached a peak in the mid-1990s. The abundance was kept at a high level until 2014–2015 and then began to decline. In multi-storey residential development areas, steady settlements of hamsters have now virtually disappeared, and even in large green areas (the City Park and Botanical Garden), the numbers dropped almost tenfold. One of the possible causes for this decline was cutting down shrubs and hedges, which began since 2016–2017. However, the population has also severe declined in areas with no such activities. Thus, the fate of the Simferopol hamster population is worrisome. Obviously, we are dealing with a multi-factor process which requires special studying, without which no estimating of population viability or developing of conservation measures are possible.

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Purger, Jenő J., Kornélia Kurucz, Dávid Szép, Dragica Purger, Boris Kryštufek, Danijel Ivajnšič, Tina Klenovšek e Franc Janžekovič. "European Hamster at the edge: declining in nature and rare in owl pellets". Ornis Hungarica 28, n. 2 (1 dicembre 2020): 66–73. http://dx.doi.org/10.2478/orhu-2020-0017.

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AbstractOver the last decades, the European Hamster (Cricetus cricetus) has been declining in many parts of its European range. Due to the lack of recent information on the occurrence and status of the European Hamster in the south-western Carpathian Basin west of the Danube, we used information gathered from prey remains in Common Barn-owl (Tyto alba) pellets. In spite of considerable sampling effort, we retrieved only few hamster remnants. Two skulls were found in Podolje (Croatia) in 2007 and 2016, respectively. Further five hamsters were retrieved from pellets collected in 2017, 11 km to the northwest in Udvar (Hungary). In Sátorhely, 5 km north from Udvar, one roadkill male was found on 27.07.2019. Testimonies from local inhabitants confirmed the current presence of the European Hamster in the area. Our results suggest the presence of a small isolated population in the border area of Croatia (UTM 10 km grid square CR27) and Hungary (CR18, CR19). This small isolated population is on the south-western limit of the range of the species. We presume that the population requires conservation attention because of its isolated position at the edge of the species’ range, its small size and low abundance. We call for a transboundary action by nature conservation authorities in Croatia and Hungary.

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McKune, K., e N. A. Woychik. "Functional substitution of an essential yeast RNA polymerase subunit by a highly conserved mammalian counterpart". Molecular and Cellular Biology 14, n. 6 (giugno 1994): 4155–59. http://dx.doi.org/10.1128/mcb.14.6.4155-4159.1994.

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We isolated the cDNA encoding the homolog of the Saccharomyces cerevisiae nuclear RNA polymerase common subunit RPB6 from hamster CHO cells. Alignment of yeast RPB6 with its mammalian counterpart revealed that the subunits have nearly identical carboxy-terminal halves and a short acidic region at the amino terminus. Remarkably, the length and amino acid sequence of the hamster RPB6 are identical to those of the human RPB6 subunit. The conservation in sequence from lower to higher eukaryotes also reflects conservation of function in vivo, since hamster RPB6 supports normal wild-type yeast cell growth in the absence of the essential gene encoding RPB6.

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McKune, K., e N. A. Woychik. "Functional substitution of an essential yeast RNA polymerase subunit by a highly conserved mammalian counterpart." Molecular and Cellular Biology 14, n. 6 (giugno 1994): 4155–59. http://dx.doi.org/10.1128/mcb.14.6.4155.

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Siutz, Carina, Thomas Ruf, Stefanie Monecke e Eva Millesi. "Morphometric parameters predict body fat proportions in common hamsters". Journal of Mammalogy 103, n. 2 (25 novembre 2021): 471–80. http://dx.doi.org/10.1093/jmammal/gyab137.

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Abstract Common hamsters (Cricetus cricetus) are hibernators that rely both on body fat reserves and food stores for the winter period. They face an ongoing population decline in most parts of their distribution and recently were classified as critically endangered. Knowledge on individual body fat proportions in this species is of particular interest for conservation, because it could contribute to better understand the high plasticity in overwintering strategies, overwinter mortality rates, individual variations in reproductive output, and give information on the animals’ health state. To calculate body fat proportions, we validated a method that can be applied in the field without the use of anesthesia. To develop this method, we first analyzed the body fat in carcasses of common hamsters using Soxhlet extractions and measured four morphometric parameters (body mass, head length, tibia length, foot length). The morphometric measurements were then integrated in a linear regression model to predict body fat proportions based on the measured values. The morphometric variables yielded an explained variance (adjusted R2) of 96.42% and body fat proportions were predicted with a mean absolute error of 1.27 ± 0.11% from measured values. We applied the model to predict body fat for available field data, which consistently produced reliable values. By measuring the four morphometric parameters and following the provided instructions, body fat proportions can be reliably and noninvasively estimated in captive or free-ranging common hamsters. Furthermore, the method could be applicable to other rodents after species-specific validation.

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Ulbrich, Karin, e Anja Kayser. "A risk analysis for the common hamster (Cricetus cricetus)". Biological Conservation 117, n. 3 (maggio 2004): 263–70. http://dx.doi.org/10.1016/j.biocon.2003.12.006.

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Conan, Antonin, Julie Fleitz, Lorène Garnier, Meven Le Brishoual, Yves Handrich e Jonathan Jumeau. "Effectiveness of wire netting fences to prevent animal access to road infrastructures: an experimental study on small mammals and amphibians". Nature Conservation 47 (25 marzo 2022): 271–81. http://dx.doi.org/10.3897/natureconservation.47.71472.

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Transport infrastructures, such as highways, disrupt animal migrations and cause roadkill. To mitigate the latter problem, fences have been built but their effectiveness has rarely been tested under controlled conditions. Here, we tested the effectiveness of the most commonly used fence in France and probably in Europe (wire netting fence) to block animals. We tested the wire netting fence, with and without a structural modification (i.e. an overhang), with three small mammalian species (the European hamster: Cricetus cricetus Linnaeus, 1758; the common vole: Microtus arvalis Pallas, 1778 & the wood mouse: Apodemus sylvaticus Linnaeus, 1758) and two amphibian species (the marsh frog: Pelophylax ridibundus Pallas, 1771 & the European green toad: Bufotes viridis Laurenti, 1768). During testing, all small vertebrate species tested were placed into an arena, from which they could only escape by crossing the wire netting fence. Without an overhang, almost all adult individuals of all tested species were able to climb over a 30 to 40 cm high wire netting fence. Furthermore, the addition of an 8 cm long overhang at the top of the fence stopped the amphibian species tested but not the most agile mammalian species, such as the hamster and the wood mouse. Based on these results, we do not support the construction of wire netting fences along roads as a measure to stop small animals from crossing. We recommend the use of more effective and durable fences, which, in addition, can be associated with wildlife passages to reconnect isolated populations.

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Più fonti

Tesi sul tema "Hamster commun – Conservation"

Gérard, Timothée. "Restauration de l’agrosystème de la plaine alsacienne à travers la protection d’une espèce emblématique ; le hamster commun". Electronic Thesis or Diss., Strasbourg, 2024. http://www.theses.fr/2024STRAJ065.

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L’intensification de l’agriculture a profondément altéré l’habitat du hamster commun, une espèce menacée d’extinction. Dans ma thèse, j’étudie comment le choix des cultures est susceptible de restaurer un habitat agricole favorable. Nos suivis de hamster ont été conduit en laboratoire et en enclos semi-naturel, et complétés de tests agronomiques en plein champs. Nous avons identifié que la diversité de l’environnement des hamsters est clé pour éviter les carences nutritionnelles. La présence de cultures oléagineuses, riches en énergie, est particulièrement bénéfique. Ces résultats sont prometteurs pour protéger le hamster et les autres espèces agricoles, et favoriser une agriculture durable
Agricultural intensification has profoundly altered the habitat of the endangered common hamster. In my thesis, I'm studying how crop selection can restore a favorable agricultural habitat. Hamster monitoring was conducted in laboratory and semi-natural conditions, and completed by agronomic field tests. We have identified that the diversity of the hamster's environment is key to prevent nutritional deficiencies. The presence of energy-rich oilseed crops is particularly beneficial. These results are promising for protecting hamsters and other agricultural species, and for promoting sustainable agriculture

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Tissier, Mathilde. "Conservation biology of the European hamster (Cricetus cricetus) : nutritional effects of crops on hamsters fitness and evaluation of their antipredatory behavior to upgrade wildlife underpasses". Thesis, Strasbourg, 2017. http://www.theses.fr/2017STRAJ022/document.

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Le Grand hamster (Cricetus cricetus), l’un des mammifères les plus menacés d’Europe, est en voie d’extinction en France. Toutefois, nous manquons d’information sur les causes de son déclin et sur comment améliorer sa conservation. Durant ma thèse, je me suis intéressée à l’effet des cultures sur la reproduction du hamster. Les principaux résultats indiquent qu’une consommation importante de maïs conduit à une diminution drastique du succès reproducteur en raison d’une carence en vitamine B3. Une autre étude démontre que des associations de cultures (blé-soja ou maïs-tournesol) sont favorables au hamster et devraient être mises en place en Alsace. En parallèle, j’ai développé un tube anti-prédation (TAP) pour améliorer les passages à faune et reconnecter les populations sauvages. Des tests comportementaux ont révélé que les hamsters présentent des comportements audacieux face au prédateur, mais utilisent tout de même le TAP comme refuge, validant sa fonction anti-prédation. Le TAP sera maintenant mis en place dans plusieurs passages à faune en Alsace. Les résultats de cette thèse vont maintenant bénéficier à la conservation du hamster en France et en Europe
The European hamster (Cricetus cricetus), one of the most endangered mammal in Europe, is on the verge of extinction in France. However, we are still lacking information on the causes of its decline and on how to improve its conservation. During my PhD, I therefore investigated for the nutritional effects of crops on hamsters’ fitness. The main results highlight that elevated maize consumption is severely reducing hamsters’ reproduction because of a major deficiency in vitamin B3. Then, I found that crop associations such as wheat-soybean and maize-sunflower are favorable to the species and should be implemented in the Alsace. I also developed an anti-predation tube (APT) that will serve to upgrade wildlife underpasses and ultimately allow to reconnect wild populations. Moreover, behavioral tests presented in this thesis reveal that hamsters display bold behaviors when facing a predator. Nonetheless, they use the APT as a refuge in such cases, which validated its anti-predatory function. Therefore, the APT will now be implemented in wildlife underpasses in the Alsace. Results of this PhD will now benefit the conservation of the species in France and in Europe

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Libri sul tema "Hamster commun – Conservation"

Eva, Millesi, Winkler Hans 1945-, Hengsberger Renate e Österreichische Akademie der Wissenschaften, a cura di. The common hamster (Cricetus cricetus): Perspectives on an endangered species. Vienna: Austrian Academy of Sciences Press, 2008.

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Atti di convegni sul tema "Hamster commun – Conservation"

Battiston, S., J. Maxant e P. de Fraipont. "Pleiades HR, a tool for biodiversity conservation: Case of common hamster on the Alsace Plain". In IGARSS 2012 - 2012 IEEE International Geoscience and Remote Sensing Symposium. IEEE, 2012. http://dx.doi.org/10.1109/igarss.2012.6352023.

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