Wyniki wyszukiwania - AGRO

1

Dlugi i skuteczny poscig w konflikcie dwoch ryjowek aksamitnych Sorex araneus

100%

Zwolak R.

Przegląd Przyrodniczy

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2006

|

tom 17

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nr 1-2

137-138

2

Genetic differentiation between west and east european karyotypic groups of Sorex araneus (Soricomorpha) in Poland

86%

Moska M., Wierzbicki H., Strzala T., Mucha A., Jonkisz A.

Electronic Journal of Polish Agricultural Universities. Series Veterinary Medicine

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2014

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tom 17

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nr 2

3

Craniometric study of the common shrew (Sorex araneus L. 1758) from different localities and chromosomal races across Germany and Europe

86%

Stefen C.

Acta Theriologica

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2013

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tom 58

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nr 3

A total of 440 skulls of common shrews, Sorex araneus, from Germany and Europe (Croatia, Hungary, Austria, and Norway) were studied. The material represented six chromosomal races (Ulm, Laska, Drnholec, Mooswald, Jütland, and Abisko) assignable to the Western European and Northern European karyotypic groups. The race of a few samples was not determined. Twenty-one linear measurements were taken on skulls and mandibles and used in this study. Pearson correlations and multiple linear regressions were used to see the relationship of the cranial variables to altitude, latitude, the chromosomal race, and the geographic location. The results from the tested samples differed; the most negative correlations to latitude were found in the samples assigned to the Western European karyotypic group (WEK), the least negative ones in the samples of the Ulm race. These results indicate the converse of Bergmann's rule. But taking into consideration all the samples of the different karyotypic groups across Europe, the correlations to latitude included positive ones, which would indicate that Sorex follows Bergmann's rule in some of the variables. The studied material of different karyotypic groups could not be differentiated in discriminant analyses. The separation of the studied races within the WEK alone was slightly better, but about 30 % of ungrouped cases remained. Only the separation of the regional samples within one chromosomal race revealed better results but was still very different between the races. This indicates that within the races, regional differences might be strong enough for a separation of the samples and that within a karyotypic group, and even more so across karyotypic groups, regional differences conceal racial differences.

4

Non-disjunction frequency in male complex Robertsonian heterozygotes of the common shrew

86%

Fedyk S., Chetnicki W.

Acta Theriologica

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2010

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tom 55

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nr 1

1-8

Common shrews display two types of Robertsonian (Rb) heterozygosity: simple (where CIII configurations are formed at meiosis I) and complex (which have longer meiotic chains or rings). Based on an analysis of large sample sizes (over 100) of MII cells per specimen, we estimated the non-disjunction frequency in seven Rb homozygotes and 21 complex Rb heterozygotes (CIV and CV) of Sorex araneus Linnaeus, 1758. The analysis showed high betweenindividual variability. The mean level of non-disjunction in homozygotes (2.01%) was significantly lower than in CIV and CV heterozygotes (4.27% and 5.78%, respectively). The study demonstrated that non-disjunction frequency in male CIV and CV heterozygotes was similar to that in simple heterozygotes in the common shrew.

5

New Sorex araneus karyotypes from Germany and the postglacial recolonization of Central Europe

86%

Brunner H., Turni H., Kapischke H. J., Stubbe M., Vogel P.

Acta Theriologica

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2002

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tom 47

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nr 3

New G-banded karyotypes from populations of the common shrew Sorex araneus Linnaeus, 1758 provide a clearer picture of the distribution of chromosome races in central Europe. As expected according to their occurrence in neighbouring countries, the Jutland (kq, no), Laska (k/o) and Drnholec (ko, nr) races are also found in Germany. A new chromosome race "Rügen" (kq) is described from this Baltic Island. Together with the previously recorded races Ulm and Mooswald (kr), six chromosome races are now known from Germany. The resulting distribution pattern is characterized by high frequencies of different race-specific metacentrics at the periphery of the country and clines with decreasing frequencies towards the centre which is occupied by the Ulm race. This race is acrocentric for all chromosome arms involved in the observed race-specific fusions and represents a buffer between the surrounding, more metacentric races. According to the present distribution of these metacentrics, a scenario for the postglacial recolonization of central Europe by S. araneus populations on three different routes is proposed: from the east along the northern slopes of the Carpathian Arc, from the south-east along the Danube Valley and from the south-west through the Upper Rhine Valley.

6

Cases of coat colour anomalies in the common shrew, Sorex araneus L.

86%

Chetnicki W., Fedyk S., Bajkowska U.

Folia Biologica

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2007

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tom 55

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nr 1-2

7

Invalidation of Stobnica chromosome race of the common shrew Sorex araneus

86%

Fedyk S., Wojcik J. M., Chetnicki W., Maczewski S.

Acta Theriologica

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2008

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tom 53

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nr 4

In Central Poland, two similar chromosome races of the common shrewSorex araneus Linnaeus, 1758 were earlier described: Drnholec race (arm combinationsgm, hi, ko, nr) and Stobnica race (gm, hi, ko, np). Great similarity in size and G-banding patterns between thenr andnp metacentrics leave open to doubt the actual existence of both races in Poland. The present study, which is based on good quality karyotypes of common shrews from 18 sites, showed the presence of thenr arm combination. There is therefore strong evidence that thenp arm combination was wrongly described and thus the Stobnica race should not be considered valid.

8

Phenotypic diversity and population dynamics: another look (with particular reference to the common shrew Sorex araneus)

86%

Zakharov V. M., Pankakoski E., Sheftel B. I.

Acta Theriologica. Supplement

|

1997

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nr 04

We studied temporal changes in the level of phenotypic diversity, measured by the total phenotypic variance for several characters of skull morphology, in two populations of the common shrew Sore:e araneus Linnaeus, 1758. We compared a population from central Siberia having a high-amplitude four-year cycle with a population from southern Finland having noncyclic dynamics. The level of total phenotypic diversity varied significantly among years in both populations, but was correlated neither with density nor with breeding success in either of them. We did, however, find differences between the two populations. When we compared changes in the level of phenotypic diversity with changes in the level of developmental stability, as measured by chance developmental variance (fluctuating asymmetry), the cyclic Siberian population exhibited increased developmental variability in the peak year, which was associated with relatively small proportion of other sources of variation (and genetic variation in particular). In other years, the role of chance variation was less and the proportion of other sources of variance was higher. On the other hand, in the noncyclic Finnish population, oscillations in the level of phenotypic diversity were mainly caused by changes in developmental stability. These results illustrate that not only dynamics of genotype variety, but also the alterations in the level of developmental stability can be of great importance for changes in phenotypic diversity.

9

Note on the systematic status of shrews of the Sorex araneus group in NW Anatolia

86%

Macholan M., Filippucci M. G., Slivkova L., Simson S.

Acta Theriologica

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1999

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tom 44

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nr 1

Macholan M., Filippucci M. G., Slivkova L. and Simson S. 1999. Note on the systematic status of shrews of the Sorex araneus group in NW Anatolia. Acta Theriologica 44: 101-106. Although it was assumed that the northern parts of Asia Minor were occupied by the Caucasian shrew, Sorex satunini, some recent findings have cast doubts on the specific status of shrew populations in NW Anatolia. Here, a single shrew from Uludag was studied using enzyme electrophoresis. It was compared to S. araneus from Europe and S. satunini from NE Turkey as well. The results unequivocally classify the animal under study with S. satunini and it is suggested that the common shrew, S. araneus, does not occur either in NW Anatolia or in Asia Minor in general.

10

Comparative genome mapping in mammals: the shrew map

86%

Larkin D. M., Serov O. L., Borodin P. M., Zhdanova N. S., Searle J. B.

Acta Theriologica. Supplement

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2000

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tom 45

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nr 1

11

The Sorex araneus group in the northern Iberian System Spain: a contact zone between S.coronatus and S.granarius?

86%

Lopez-Fuster M. J., Ventura J., Garcia-Perea R., Gisbert J.

Acta Theriologica

|

1999

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tom 44

|

nr 2

Available information on the distribution of the European species of the Sorex arañéis group in the Iberian Peninsula suggests that the Iberian System (north-central Spain might be a sympatric area between S. coronatus Millet, 1828 and S. granarius Miller, 1910. With the aim to assess this hypothesis, multivariate analyses based on 16 skull and mandible parameters were carried out on 78 shrews from the Iberian System. A preliminary specific determination was performed on 57 specimens using a discriminant function established in a previous study. Two further discriminant functions based on skull and mandible variables respectively were constructed from the sample analysed and both provided an identical classification of the specimens, although slight.y different from that of the preliminary determination. In order to summarize the n.orphometric interspecific relationships a principal components analysis was performed. Results obtained confirm the presence of S. coronatus and strongly suggest that of S. granarius and of a contact zone between both species in the Iberian System. In this area both species share the same general habitats, occupying oro- and supramedi- terrarean bioclimatic levels. Taking into account the distributional pattern reported for S. araneus and S. coronatus in sympatric areas, and considering the convergence in size observed between S. granarius and S. coronatus in the Iberian System, we suggest that in this contact zone both species might have a parapatric distribution, due most probably to microhabitat segregation.

12

Tissue metabolism in the common shrew and the bank vole

72%

Malzahn E.

Acta Theriologica

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1974

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tom 19

|

nr 14-25

13

Variations in the hematological parameters of shrews

72%

Wolk E.

Acta Theriologica

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1974

|

tom 19

|

nr 14-25

14

Cytogenetyczne aspekty specjacji zwierząt

72%

Fedyk S.

Kosmos

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1987

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tom 36

|

nr 3

15

The neuronal structure of the dorsal nucleus of the lateral geniculate body in the common shrew [Sorex araneus] and the bank vole [Clethrionomys glareolus] : Golgi and Nissl studies

72%

Najdzion J., Wasilewska B., Szteyn S., Robak A., Bogus-Nowakowska K., Rowniak M.

Folia Morphologica

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2006

|

tom 65

|

nr 4

352-358

The topography and neuronal structure of the dorsal nucleus of the lateral geniculate body (GLd) of the common shrew and the bank vole are similar. The lateral geniculate body of both the species examined has a homogeneous structure and no observable cytoarchitectonic lamination. On the basis of the shape of the dendritic arbours as well as the pattern of dendritic arborisations the following two types of neurons were distinguished. Type I “bushy” neurons that have multipolar or round perikarya (common shrew perikarya 9–12 µm, bank vole perikarya 10–13 µm), with 4–6 short thick dendritic trunks that subdivide into many bush-like branches. The dendritic trunks are smooth, in contrast to the distal branches, which are covered with numerous spine-like protrusions of different lengths and forms. An axon emerges from the soma, sometimes very close to one of the primary dendrites. The type I neurons are typically projection cells that send their axons to the primary visual cortex. These neurons predominate in the GLd of both species. Type II neurons, which have an elongated soma with primary dendrites arising from opposite poles of the perikaryon (common shrew perikarya 8–10 µm, bank vole perikarya 9–11 µm). The dendritic arbours of these cells are less extensive and their dendrites have fewer spines than those of the type I neurons. Axons were seldom observed. The type II neurons are presumably interneurons and are definitely less numerous than the type I neurons.

16

Niektore dane na temat kreta Talpa europaea i ryjowki aksamitnej Sorex araneus - ssakow zywiacych sie dzdzownicami

72%

Gorz A.

Zeszyty Naukowe Akademii Rolniczej w Krakowie. Sesja Naukowa

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1996

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tom 47

55-58

17

Chromosome races of the common shrew Sorex araneus in Poland: a model of karyotype evolution

72%

Wojcik J. M.

Acta Theriologica

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1993

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tom 38

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nr 3

Five distinct chromosome races of the common shrew Sorex araneus Linnaeus, 1758 including different metacentrics with monobrachiat homology have been found in Poland. Their karyotypes include polymorphic arm combinations, and chromosomal forms differing in numbers of acrocentrics can be distinguished among them. The relationship between Polish and other European races of the common shrew has been examined by phylogenetic analysis using parsimony. Five phylogenetic groups of the common shrew, two of them consist only of one race, can be recognized in Europe. The Polish races belong to two groups: the West European and East European phylogenetic groups. A model of chromosomal evolution in the common shrew consisting of two components, an allopatric one and a parapatric or stasipatric one, has been proposed. This model is based on the distribution of different races and different metacentrics in karyotypes of shrews in Poland and in central Europe.

18

Developmental stability and population dynamics of shrews Sorex in Central Siberia

72%

Zakharov V. M., Demin D. V., Baranov A. S., Borisov V. I., Valetsky A. V., Sheftel B. I.

Acta Theriologica. Supplement

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1997

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nr 04

We examined temporal variation in developmental stability measured by fluctuating asymmetry of 10 skull characters in sympatric populations of three shrew species: Sorex araneus Linnaeus, 1758, S. caecutiens Laxmann, 1788 and S. tundrensis Merriam, 1900 from one locality in central Siberia with a high four-year-cycle of small mammals. Simultaneous significant changes in developmental stability have been revealed during a population cycle 1986-1989 for all three, most abundant shrew species in the locality. The highest asymmetry for all these species occurred in the year of maximal density. Similar high asymmetry was found for the separate samples of two other species: S. roboratus Hollister, 1913 and S. isodon Turov, 1924, collected in a peak year 1989 only. The maximal density in 1989 corresponded to the lowest level of breeding success and developmental stability and, vice versa, minimal density in 1986 was accompanied by the highest level of breeding success and developmental stability. These data suggest that overpopulation caused by high density of various small mammals adversely affects an organism's condition. Thus, developmental stability may be used to monitor possible changes in a population even in cases where direct estimation of fitness is difficult.

19

Sex chromosome meiotic drive in hybrid males of the common shrew [Sorex araneus]

72%

Fedyk S., Bajkowska U., Chetnicki W.

Folia Biologica

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2005

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tom 53

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nr 3-4

20

Morphometric difference between the Novosibirsk and Tomsk chromosome races of Sorex araneus in a zone of parapatry

72%

Polyakov A. V., Onischenko S. S., Ilyashenko V. B., Searle J. B., Borodin P. M.

Acta Theriologica

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2002

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tom 47

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nr 4

A hybrid zone between the Novosibirsk and Tomsk chromosome races of the common shrew Sorex araneus Linnaeus, 1758 was found near Novosibirsk city (West Siberia, Russia) in an area unimpeded by geographic barriers. In this zone, the shrews of both races and their hybrids were trapped and karyotyped and 22 features of their cranial and postcranial skeleton were measured. Canonical discriminant analysis revealed 3 distinct groups of individuals, which corresponded to the 3 karyotypic categories involved in the analysis. The first discriminant function reflected the differences in the size of skeletal elements. The Novosibirsk shrews and the hybrids were significantly smaller than the Tomsk shrews. The second discriminant function was interpreted as a parameter of skeletal proportionality. The hybrids were significantly less proportional than the parental races. This study revealed one of the clearest examples of morphological differentiation between chromosome races of the common shrew.

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