Peter Fritzsche

Peter Fritzsche
Martin Luther University Halle-Wittenberg | MLU · Institute of Biology

Dr.

About

26
Publications
9,802
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520
Citations
Citations since 2016
5 Research Items
199 Citations
2016201720182019202020212022010203040
2016201720182019202020212022010203040
2016201720182019202020212022010203040
2016201720182019202020212022010203040
Additional affiliations
September 1994 - present
Martin Luther University Halle-Wittenberg
Position
  • Professor (Assistant)

Publications

Publications (26)
Article
Full-text available
Knowledge about species’ distributions is central to diverse applications in ecology, biogeography, and conservation science. Hot-spring snakes of the genus Thermophis share a distribution restricted to geothermal sites at the Tibetan Plateau (T. baileyi) and in the Hengduan Mountains (T. zhaoermii, T. shangrila). Although the suture zones of these...
Article
Full-text available
We examined the natural population structure of the Turkish hamster (Mesocricetus brandti) by analysing partial mitochondrial sequences of the control region and the cytochrome b gene. Evolutionary lineages were defined on haplotype clusters in genetic trees and a median-joining network. Most significant divergence events in M. brandti nested in th...
Article
Full-text available
Between 2009-2016, we investigated a population of smooth newts found in a 4 m 2 pond in the Eastern courtyard (Osthof) of the Zoological Institute of the Martin Luther University, Halle/Saale, Germany. We tested all individuals biometrically for the period of their presence and recognized individuals by taking photographs of their belly side. We f...
Article
Full-text available
Monitoring daily activity patterns of animals in the field and in captivity often revealed different results. For example, Syrian hamsters Mesocricetus auratus showed diurnal surface activity in the field, but nocturnal patterns in the laboratory. The aim of our study was to monitor the field activity of a close relative of this species, the Ciscau...
Article
Full-text available
The genus Phodopus consists of three species-P. campbelli (Pc), P. sungorus (Ps), and P. roborovskii (Pr). They inhabit steppes, semi-deserts, and deserts in continental Asia with a climate changing from a moderate to a hard Continental one with extreme daily and seasonal variations. These different environmental challenges are likely to have conse...
Article
Full-text available
Circadian rhythms have been shown to influence learning and memory. In this study, cognitive functions of Djungarian hamsters revealing different circadian phenotypes were evaluated using a novel object recognition (NOR) task. Wild type (WT) animals show a clear and well-synchronized daily activity rhythm, whereas DAO hamsters are characterized by...
Article
AimOur aims were to investigate the geographical distribution, population history and demographics of the hot-spring snake Thermophis baileyi, and to examine how the Pleistocene glacial stages and geomorphological configurations resulting from the uplift of the Tibetan–Himalayan orogen shaped the genetic diversity and evolutionary history of the sp...
Article
Dispersal is a key factor in shaping the genetic structure and population dynamics of species; thus, its understanding is a fundamental requirement in formulating appropriate conservation strategies. Higher rates of dispersal in one sex than the other are widespread in vertebrate species and often attributed to the genetic advantages of reduced inb...
Article
Isolated juvenile golden hamsters produce ultrasonic and audible vocalizations, so-called isolation calls, as a reaction to being separated from their mother and nest and their cooling down. Their aim is to stimulate mothers to search and retrieve the pups. In this work, the vocalization of juvenile laboratory (Zoh:GOHA; Institute of Zoology, Marti...
Article
Full-text available
Foraging theory posits that animals should maximize energy gains while minimizing risks, the largest of which is usually predation. For small burrowing mammals the best measure of risk avoidance may be the time spent in the burrow, although this measure is rarely examined. During the spring of 2005 and 2006 we recorded the foraging behavior of fema...
Article
Full-text available
The hamsters of the genus Phodopus (P. campbelli, P. sungorus, P. roborovskii) inhabit different ecosystems facing them with different environmental challenges. This should have behavioural and physiological consequences, manifested genetically. Therefore, the present paper compares the daily activity rhythm of the three Phodopus species under vari...
Article
Full-text available
Daily activity rhythms are nearly universal among animals and their specific pattern is an adaptation of each species to its ecological niche. Owing to the extremely consistent nocturnal patterns of activity shown by golden hamsters (Mesocricetus auratus) in the laboratory, this species is a prime model for studying the mechanisms controlling circa...
Article
All laboratory golden hamsters (Mesocricetus auratus) originated from a sibling pairing back in 1930. Due to this extreme founder event, domestic golden hamsters are presumed to be one of the most bottlenecked animal populations. Nevertheless, domestic hamsters show no obvious signs of inbreeding depression in commonly used breeding stocks. To expl...
Article
Full-text available
Currently, 4 species, Mesocricetus auratus, Mesocricetus raddei, Mesocricetus newtoni, and Mesocricetus brandti of the genus Mesocricetus are accepted as the valid taxa based on karyotype and morphologic features. A potential fifth species, Mesocricetus nigriculus, is under dispute and is currently listed as a subspecies of M. raddei, along with Me...
Article
Full-text available
Abstract: Currently, 4 species, Mesocricetus auratus , Mesocricetus raddei , Mesocricetus newtoni , and Mesocricetus brandti of the genus Mesocricetus are accepted as the valid taxa based on karyotype and morphologic features. A potential fifth species, M e s o c ric e t u s nig ric ulu s , is under dispute and is currently listed as a subspecies o...
Article
Ten polymorphic microsatellites were developed for the golden hamster (Mesocricetus auratus), a widely used model organism in biological and medical researches. All loci were used to analyse the microsatellite variability in wild golden hamsters from Syria and in a sample of domestic animals comprising different strains. Average mean expected heter...
Article
Full-text available
Telemetric investigations of various parameters are widely used to estimate an animal's state. However, the implantation of the transmitters includes anaesthesia and surgery and has short and longer lasting impacts on the studied object. The aim of the present paper was to evaluate these effects in Mongolian gerbils, namely the hypothermia caused b...
Article
Running wheels are frequently used in behavioural and physiological experiments. The function of wheel-running activity in laboratory animals is controversial. In the present long-term study, the influence of this activity was evaluated in male golden hamsters over a period of 52 weeks. Four months after the start of the experiment, hamsters with a...
Article
Full-text available
All laboratory golden hamsters originate from a sibling pairing back in 1930. To investigate possible differences between domesticated and wild conspecifics, descendants of both strains were maintained under standardized laboratory conditions individually and in unisexual groups. Body mass and food consumption were monitored from birth to 22 weeks...
Article
The golden hamster (Mesocricetus auratus) is one of the most frequently used laboratory animals, particularly in chronobiological studies. One reason is its very robust and predictable rhythms, although the question arises whether this is an inbreeding effect or rather is typical for the species. We compared the daily (circadian) activity rhythms o...
Article
Full-text available
Two expeditions were carried out during September 1997 and March 1999 to confirm the current existence of Mesocricetus auratus in northern Syria. Six females and seven males were caught at different sites near Aleppo. One female was pregnant and gave birth to six pups. Altogether, 30 burrows were mapped and the structures of 23 golden hamster burro...
Article
The consequences of group-keeping as a social stressor on the solitary-living golden hamster were studied. Two females at the same stage of the estrous cycle were kept together for 5 weeks. Behavioral observations showed that the dominance structures within groups were unstable. Intensity of aggression was highest at metestrous, whereas the greates...
Article
Glucose-6-phosphate-dehydrogenase activity in the liver of female golden hamsters being in various stages of the estrous cycle were investigated. Animals of the pro- and diestrous stage showed a significantly higher activity than those of the met- and estrous stage. The interpretation of the results in test series has to consider this fact. Possibi...

Questions

Question (1)
Question
When we talk about animal welfare my question is what kind (species, class, phylum) of animals we are dealing with? E.g. only vertebrates or also invertebrates? If invertebrates all of them or only certain ones?

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