Wyniki wyszukiwania - Biblioteka Nauki

1

Observations on the releasing of the European beaver

100%

Zurowski W. , Jaczewski Z.

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tom 19

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nr 14-25

2

Impact of beaver dams on surface channel capacity and phytocoenoses diversity of Łąki Soleckie (PLH140055)

100%

Oleszczuk R. , Urbański J. , Pawluśkiewicz B. , Bajkowski S. , Małuszyński M. J. , Małuszyńska I. , Jadczyszyn J. , Hewelke E.

Journal of Water and Land Development

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2024

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tom no. 61

96--105

EN

The aim of the study was to determine the extent to which created and functioning beaver dams contribute to increasing water retention in the Łąki Soleckie facility (Mała River valley). Changes in the plant cover of meadow habitats within the range of beaver dams were also determined. During the growing periods in 2020-2022, measurements of the periodic levels and water retention of the Mała River and the adjacent ditches (R-27, R-29) were closely related to the activity of beavers and precipitation. The maximum volume of water retained in the Mała riverbed in 2020-2022 was 1,300, 1,700, and 1,200 m3 ; the maximum retention of the R-29 ditch was 270, 210, and 200 m3, respectively. In 2021-2022, the R-27 ditch collected the most water - 270 m3 and 250 m3. Starting from June 2022, due to beaver dams D2 and D3, the water level in the river and water retention have stabilised at a high level, despite slight rainfall. The activity of beavers contributed to the transformation of communities of wet habitats located on organic soils (Calthion) into communities of periodically wet habitats (Caricetum gracilis). In places where natural habitat 6510 occurs, the coverage of species of the Festuca genus has increased, and the value of the biodiversity index has increased by an average of 9%. High stability in the community of expansive species (Deschampsia caespitosa and Veronica longifolia) and their increasing cover may make it difficult to maintain the proper condition of natural habitat 6510.

3

Inwentaryzacja populacji bobra europejskiego (Castor fiber) w zlewni rzeki Osownicy

100%

Miszczuk H. , Oglęcki P.

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tom Vol. 13, No. 2

179--190

EN

The investigations the beavers were carried out in 2003-2004 with original method worked out by authors on the bases of their own experiences and literature data. About 20 specimens were observed which influences for ecosystems were analyzed in details. The environmental changes corsed by beavers and greliminary suggestions for the sustainable human activity in the future were shown.

4

Wodni budowniczowie

100%

Nawrot R.

Zieleń Miejska

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2022

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tom Nr 3

32--33

PL

Jeśli gdzieś trzeba stawiać tamy, natychmiast tam się pojawiamy – śpiewają bobry w Tajemnicach wiklinowej zatoki. I rzeczywiście, pojawiają się licznie. W miastach można się o nie prawie potknąć.

5

Abnormal incisor growth in Eurasian beaver

100%

Rosell F. , Kile N. B.

Acta Theriologica

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1998

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tom 43

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nr 3

EN

An abnormally long incisor of an adult Eurasian beaver Castor fiber Linnaeus, 1758 is reported. The animal weighed about 20 kg and was in good condition when shot at 3 years of age. The tooth had grown at an angle in towards the beaver's left eye. Assuming the animal to be 35 months old and total tooth length to be 13.5 cm, then growth rate would have been 0.39 cm per month. This report indicates that beaver can survive despite abnormal growth of one incisor.

6

Subspecies of the European beaver Castor fiber Linnaeus, 1758

100%

Gabrys G. , Wazna A.

Acta Theriologica

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2003

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tom 48

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nr 4

EN

Subspecific relationships of the European beaver Castor fiber have been obscured by failure to follow the rules of the International Code of Zoological Nomenclature and remain an open issue. Inconsequence in the use of subspecies names caused a nomen- clatural as well as a taxonomic confusion. We discuss these controversial and incorrect nomenclatural decisions, and recognize 9 nominal subspecies of European beaver, bearing 9 available names: C. f. fiber Linnaeus, 1758, C. f. galliae Geoffroy, 1803, C. f. albicus Matschie, 1907, C. f. vistulanus Matschie, 1907, C. f. pohlei Serebrennikov, 1929, C. f. birulai Serebrennikov, 1929, C. f. tuvinicus Lavrov, 1969, C. f. belorussicus Lavrov, 1981, and C. f. orientoeuropaeus Lavrov, 1981.

7

Scent marking in Eurasian beaver Castor fiber during winter

100%

Rosell F. , Bergan F.

Acta Theriologica

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2000

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tom 45

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nr 2

EN

The Eurasian beaver Castor fiber Linnaeus, 1758 deposit castor fluid (castoreum) and/or anal gland secretion at scent mounds in their territory year round. We investigated the hypothesis that during winter Eurasian beavers may intensify use of scent, in year round ice-free water systems, during the breeding season. This study showed that the median number of scent marks in 7 territories increased significant ly in the breeding (January-March 1996}, compared to the nonbreeding portion of winter (October- -Decemher 1995), which is consistent with our prediction. The median number of scent marks was significantly higher during February, compared to January and March. This may be due to females approaching or being in oestrous in our study area during February. Further studies are, however, needed to clarify how information in scent marks are coded and transmitted during the breeding season.

8

Fatty acid profile of meat and reserve fatty tissue lipids of European beaver [Castor fiber]

100%

Kwiatkowska A. , Jankowska B. , Zmijewski T. , Korzeniowski W.

Polish Journal of Natural Sciences

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2003

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tom 14

9

The presence of lymphatic stomate in the ovarian bursa on the European beaver as shown by scanning electron microscopy study

100%

Dobroszynska T. , Janiszewska L.

Folia Morphologica

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1998

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tom 57

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nr 4

10

Nucleus olivaris in the beaver

100%

Szteyn S.

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tom 19

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nr 14-25

11

The dynamics of the population of beavers and the flora chewed by them in the Lezajsk Forest Inspectorate

84%

Wojcik M. , Dziedzic R. , Steliga L. , Olszak K. , Flis M. , Zwolski W.

Teka Komisji Ochrony i Kształtowania Środowiska Przyrodniczego

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2004

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tom 01

12

A simple conceptual model of the co-functioning of natural and cultural resources

84%

Schwerk A.

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2006

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tom 27

13

The impact of beaver ponds on tree stand in a river valley

84%

Boczon A. , Wrobel M. , Syniaiev V.

Journal of Water and Land Development

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2009

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nr 13a

14

The impact of beavers' (Castor fiber L.) lodges on vascular plant species diversity in forest landscape

84%

Obidzinski A. , Orczewska A. , Cieloszczyk P.

Polish Journal of Ecology

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2011

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tom 59

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nr 1

EN

Beavers lodges represent specific, zoogenic habitats. Their flora show some distinctive features differentiating them from the species composition of the areas surrounding the lodges. Studies were conducted in the Romincka Forest, in north-eastern Poland. Although lodges and their surroundings did not differ in the total number of vascular plants recorded in their area, the 40 beavers lodges studied had a significantly higher mean species richness, however half of the total species cover compared with the lodges’ surroundings. Species from the Lamiaceae, Polygonaceae and Asteraceae families were more often present in lodges rather than in their surroundings. Within the lodges there were more species tolerating disturbance (r strategy), more hemicryptophytes and therophytes, more species associated with eutrophic habitats and of neutral soil reaction. Aside from this, species from the Alnetea glutinosae, Bidentetea tripartiti, Scheutzerio- Caricetea, Artemisietea vulgaris, and Stellarietea mediae classes had a bigger share compared to lodges’ surroundings. Finally, there were also more euhemerobic species recorded in that habitat. By contrast, the communities which surround the lodges had a higher representation of stresstolerant species (s strategy), typical for mesotrophic habitats with acidic soils and more mesohemerobous and urbanophobous species. The above mentioned tendencies allowed to conclude that beavers’ lodges contribute to the increase in the diversity of habitats and subsequently may be regarded as an important factor influencing flora and vegetation biodiversity.

15

Motyw bobra w kulturze antycznej i średniowiecznej – między toposem literackim a rzeczywistością

84%

Rosa I.

Rocznik Antropologii Historii

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2017

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nr 10, Antropologia - folklor - historia

203–231

XX

The article concerns the motif of beaver in the medieval literature. The first part of this study is an attempt at genetic criticism of the antique roots of this motif; we demonstrate a plurality of approaches to describing this animal and a profound connection of early Christian writings and ancient pagan texts. Furthermore, it is impossible to trace, with all certainty, the origins of this topos, as we have shown through source criticism of Aesop's Fables and The Histories of Herodotus. Physiologus and Etymologies of Isidore of Seville, taking from a selection of antique texts, the transformed motif of beaver, so as to adapt it to new guidelines. Since Physiologus was written, until the turn of the 12th and 13th centuries, the ancient plurality of approaches to the description of this animal has been limited and adjusted to requirements of Christian writings. In addition, the analysis of the topos of beaver allowed the voicing an opinion on the subject of the still disputed origins of Physiologus. In the high Middle Ages, the discussion concerned the contradictions between marvellous early Christian literary tradition, the observations of Gerald of Wales and the rediscovered plurality of ancient approaches to zoology. The analysis of Itinerarium Cambriae and medieval encyclopedias along with iconographical material sheds a new light on the origins and functioning of the motif of beaver in medieval writing as well as medieval relations between human and nature in general.

16

Stichorchis subtriquetrus as a common parasite of beavers indigenous to the Lublin region

84%

Demkowska-Kutrzepa M. , Studzinska M. , Tomczuk K. , Rozanski P.

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tom 62

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nr Suppl.

17

Characteristics of the European beaver (Castor fiber L.) population in the Tuchola Forest

84%

Janiszewski P. , Gugolek A. , Nowacka D.

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nr 1

18

Cephalic arteries in the European beaver Castor fiber

84%

Frackowiak H. , Smielowski J.

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nr 2

EN

Cephalic arteries of 17 European beavers Castor fiber Linnaeus, 1758 were examined. After the common carotid arteries were injected with resin, the heads were biologically macerated. Differences between individual specimens as well as asymmetrical distribution of certain arteries were noted. It was found that in the European beaver the common carotid artery divided into external and internal carotid arteries. The internal carotid artery is well developed in C. fiber, whereas in some other rodents it may be obliterated. The examined beavers had no stapedial arteries.

19

Building activity of beavers

84%

Zurowski W.

Acta Theriologica

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1992

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tom 37

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nr 4

EN

Observations on the building activity of European beavers, Castor fi ber Linnaeus, 1758, were carried out in two dissimilar lakelands in Poland to which beavers were being reintroduced from 1974 to 1985. Reintroduced beavers occupied 62 sites, and lodges were built in 76% of the sites. Several sites contained two or more lodges. Most lodges had a circular or oval base (83%) and a conical side view (85%). The size of lodges differed significantly {p = 0.051) between the two lakelands, with larger lodges at sites characterized by water scarcity. Beavers built lodges immediately after their settlement in 50% of sites, while in the other sites lodges appeared 1-8 years later. Lodge construction is frequently related with the first appearance of kits. In the study area beavers built 27 dams in 17 sites, apparently to improve water conditions and to get safe access to new stores of winter food. Dams usually wore built without acoustic stimuli. Behaviour of reintroduced beavers suggest threat as their main motivation for any building activity.

20

Influence of beaver ponds on the macroinvertebrate benthic community in lowland brooks

67%

Arndt E. , Domdei J.

Polish Journal of Ecology

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2011

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tom 59

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nr 4

EN

Beavers (Castor fiber) alter stream ecosystems by dam building resulting in a lower stream velocity, retention of sediments and organic matter as well as modifying physical, chemical and geomorphological conditions in these streams. The effects of beaver dams on invertebrate benthic communities were examined in two semi-natural lowland brooks. For this purpose, beaver ponds and reference sections upstream and downstream of each pond were sampled. Mollusca, Crustacea and five orders of aquatic insects were analyzed according taxa richness, abundances, micro-habitat preferences and feeding types to characterize the macroinvertebrate communities. Detailed data in downstream sections and taxa-related parameters of insects (upstream and downstream sections) were analyzed first time. The abundance of Trichoptera, Plecoptera and Crustacea as well as taxa numbers of EPT taxa decreased significantly in the ponds compared to the free-flowing sections. Odonata and Ephemeroptera did not respond in abundance but in a change of the species composition, because lentic species replaced the lotic species in the impoundment section. Only the number of molluscs increased in the ponds. Regarding the microhabitat preferences, lithal dwellers dominated in all free-flowing sections, whereas its proportion decreased in the ponds. On the opposite, pelal dwellers increased in the impounded area. Significant differences were also found in proportions of shredders and passive filter feeders (decreasing in ponds), whereas predators increased in the ponds compared to the downstream section of the brooks.