A5003602911- Circadian rhythm and melatonin
- Spaceflight effects on biology
- Bat Biology and Ecology Studies
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- Neuroendocrine regulation and behavior
- Genetics, Aging, and Longevity in Model Organisms
- Wildlife Ecology and Conservation
- Physiological and biochemical adaptations
- Paranormal Experiences and Beliefs
- Photoreceptor and optogenetics research
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- Ecology, Conservation, and Geographical Studies
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- Isotope Analysis in Ecology
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Ludwig-Maximilians-Universität München
2018-2021
Institut des Neurosciences Cellulaires et Intégratives
2009-2021
Université de Strasbourg
2009-2021
Centre National de la Recherche Scientifique
2009-2021
LMU Klinikum
2019
Institut für Mikroökologie
2016
University of Stuttgart
2004-2014
ESR Endangered Species Research Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsSpecials 31:119-145 (2016) - DOI: https://doi.org/10.3354/esr00749 FEATURE ARTICLE: REVIEW Dramatic global decrease in range and reproduction rate of European hamster Cricetus cricetus Alexey Surov1, Agata Banaszek2, Pavel Bogomolov1, Natalia Feoktistova1, Stefanie Monecke3,* 1Severtsov Institute Ecology Evolution, Russian...
Women can synchronize their menstrual cycles with the Moon.
Adaptation of biological rhythms to a seasonal environment in circannual mammals is achieved via the synchronization intrinsic external year by photoperiod. In mammals, photoperiodic information integrated physiology pineal hormone melatonin regulation pars tuberalis (PT) TSHβ expression and its downstream control hypothalamic dio2 gene expression. European hamster, however, entrainment clock possible pinealectomized animals. The present study explores whether PT pathways are regulated...
This study investigated in male European hamsters (Cricetus cricetus ) whether entrainment of circannual rhythms follows the principles nonparametric model. In 2 experiments times year when long (LP) or short photoperiod (SP) are able to synchronize reproductive cycle were determined, by recording phase response curves (PRCs). A total 28 groups 10 synchronized SP, before being subjected converse experiments: a) 14 transferred constant LP, only interrupted SP for 1 month (SP-pulse), pulse...
In mammals, the pineal hormone melatonin is thought to be essential process environmental photoperiodic information. this study, we demonstrate in a circannual species, European hamster Cricetus cricetus, existence of melatonin-independent second pathway. 4 physiological parameters (reproduction, body weight, activity pattern, temperature), large majority pinealectomized hamsters were entrained an accelerated regime. It compressed natural variations photoperiod 6-month cycle, which allowed...
Three animals born to homozygous tau mutant (τ(ss), "super short") Syrian hamsters showed extremely short free-running periods of locomotor activity (τ(DD) approximately 17.8 hours). Inbreeding produced 33 such duper" animals, which had a τ(DD) 18.09 ± 0.05 hours, was shorter than that τ(ss) (20.66 0.07 p < 0.001). To test the hypothesis gene (Duper) is responsible for 2-hour shortening τ(DD), we backcrossed super duper unrelated animals. The F(1) pups uniformly similar (19.89 0.15 hours),...
Abstract In 2002 a pest biologist (LEIRS 2002) calculated the survival chances of European hamster (Cricetus cricetus) according to data provided by participants meeting International Hamster Workgroup in Tongeren. His model was based predominantly on demographic as birth rates and predicted that will be extinct Western Europe within next 50 years. Since then, mean number litters females raise year has diminished from 2-3 1-2. It is thus feared remaining time only half long extinction might...
Résumé. — Le Hérisson d’Algérie (Atelerix algirus) dans la vallée de Soummam (Algérie) : étude mortalité due au trafic routier. Les causes des populations d’animaux sauvages sont variées mais une plus importantes chez les espèces taille moyenne est à circulation routière. En Europe l’Ouest, en relation avec l’existence d’un réseau routier dense, le communes touchées par Dans pays d’Afrique du Nord, et particulier Algérie, parc automobile réseaux routiers se développés considérablement ces...
The European hamster (Cricetus cricetus) is a circannual species in which the synchronization of cycle to natural year occurs during 2 annual phases sensitivity. Around summer solstice, animals are sensitive shortening photoperiod. During this phase, pronounced changes circadian output parameters observed, indicating different functional state system. This special assumed be necessary develop extreme sensitivity short day length hamsters phase. In conditions, able recognize photoperiod...
This study documents the characteristics of a large series spontaneously occurring thymomas in laboratory colony European hamsters ( Cricetus cricetus). Thymomas are rare organotypic neoplasms originating from thymic epithelial compartment. Because hamster largely resembled their human counterparts, recent World Health Organization (WHO) classification tumors was used. Forty both sexes aged 3–29 months were examined macroscopically and histologically. In 22 (55%) 40 animals, necropsy...
Annual rhythms of body weight and reproduction in the European hamster (Cricetus cricetus) are result an interaction between seasonal changes day length (photoperiod) responsiveness animals to these photoperiods. The present study demonstrates that under natural conditions hamsters not able perceive long photoperiods (i.e., a 16L:8D cycle) before mid-November. This is important difference other species, which regrowth gonads can be stimulated by exposure at any stage gonadal regression....
Annual rhythms in humans have been described for a limited number of behavioral and physiological parameters. The aim this study was to investigate time-of-year variations late arrivals, sick leaves, dismissals from class (attendance), grades (performance). Data were collected Dutch high school students across 4 academic years (indicators attendance about 1700 students; 200 students). Absenteeism showed seasonal variation, with peak winter, which more strongly associated photoperiod (number...
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 recently were classified as critically endangered. Knowledge individual proportions this species is particular interest conservation, because it could contribute to better understand high plasticity overwintering strategies, overwinter mortality rates, variations reproductive output,...
Nächtliche Beleuchtung ist nicht mehr wegzudenken aus unserem Leben. Wir setzen uns ihr sogar freiwillig bis spät in der Nacht und unsere Straßen sind immer heller erleuchtet. empfinden das als angenehm. Ein negativer Effekt wird bemerkt. Auch die Folgen des Klimawandels kaum direkt spürbar unserer von Natur weitgehend abgeschotteten Welt, wir zunehmend indoor Aktivitäten nachgehen.