Wyniki wyszukiwania

1

Relationship between prey availability and population dynamics of the Eurasian lynx and its diet in northern Belarus

100%

Sidorovich V. E.

Acta Theriologica

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2006

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tom 51

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nr 3

265-274

The diet and population dynamics of the Eurasian lynxLynx lynx Linnaeus, 1758 as well as an index of its main prey abundance were studied in transitional mixed forests of northern Belarus in 1985-2004. Monitoring of the lynx population and its main potential prey (the mountain hareLepus timidus, and the roe deerCapreolus capreolus) was done by snow-tracking. Also, abundance of tetraonids (Tetraonidae) was monitored by sight count. Hare numbers were fairly stable during the study period, whereas density of the roe deer population markedly increased, and tetraonids decreased. Composition of the lynx diet was stable seasonally. Lynx fed mostly on hares, roe deer and birds (usually tetraonids) year-round. However, the share of roe deer in lynx diet increased significantly during the period of its higher abundance and the share of tetraonids decreased with their decreasing numbers. There was also a remarkable increase of lynx population, which followed that of the roe deer, despite the pronounced decline of tetraonids. The results of the study emphasised the importance of roe deer as a prey of the Eurasian lynx.

2

Reproductive plasticidy of the American mink Mustela vison in Belarus

100%

Sidorovich V. E.

Acta Theriologica

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1993

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tom 38

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nr 2

Reproduction of the American mink Mustela vison Schreber, 1777 population introduced to Belarus was studied in 1983 — 1992. Material consisted of 52 male genitalia, carcasses of 45 pregnant females, and observations of 19 litters with blind cubs and 31 litters with larger cubs, The study was conducted in two areas in northern Belarus: Rossony, where the decrease of mink numbers due to excessive trapping was recorded, and Gorodok, where the expansion of American mink in the presence of the native European mink Mustela lutreola was observed. Mating period of American mink lasted from mid February to mid April. Young were born from April till mid June. Litter size was on average 4.2 (blind cubs) and 3.3 in older cubs (> 2 months old). Reproduction intensity on Drissa river and its tributaries was related to density. On average, 3.3 embryos per pregnanat female were found in 1-yr females and 4.3 in > 2-yr old females at the density of 13.3 mink/10 km of watercourse. In the low density population (2.8 mink/10 km due to overexploitation by hunters) reproduction intensity increased to an average of 4.2 embryos in 1-yr females and 6.0 in £ 2-yr females. During population decrease, percentage of young increased and the sex ratio became biased towards females. In an expanding population of American mink that had newly colonised Lovat river, the reproduction was very intense (7.3 - 7.6 embryos/female). The results show a great reproductive plasticity of American mink that obviously helped this species to successfully colonise new ranges after introduction.

3

Structure, reproductive status and dynamics of the otter population in Byelorussia

88%

Sidorovich V. E.

Acta Theriologica

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1991

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tom 36

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nr 1-2

4

Porównawcza morfometria allometryczna czaszki norki (Mustela vison Schreber, 1777) pochodzenia kanadyjckiego i białoruskiego; status taksonomiczny

63%

Kruska D. C. T., Sidorovich V. E.

Zwierzęta Futerkowe

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2014

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nr 2

5

Reproduction in otters in Belarus and north-western Russia

63%

Sidorovich V. E., Tumanov I. L.

Acta Theriologica

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1994

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tom 39

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nr 1

Between 1967 and 1991, otters Latra lutra (Linnaeus, 1758) were collected from Belarus and NW Russia (St. Petersburg, Pskov, and Novgorod regions). Reproductive status was assessed by histological study of the reproductive organs of 99 otters. Reproductive maturity was recorded in otters > 2 years old. No definite breeding period could be determined. The uteri of 10 females contained from 2 to 4 non-resorbing embryos, 2.6 on average. The sizes of 81 litters of blind cubs were counted; an average of 2.6 cubs per litter was recorded.

6

Toads Bufo spp. in the diets of mustelid predators in Belarus

63%

Sidorovich V. E., Pikulik M. M.

Acta Theriologica

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1997

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tom 42

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nr 1

Amphibians were important prey to the European mink Mustela lutreola, the American mink M. vison, polecat M. putorius, river otter Lutra lutra, and badger Meles meles, and formed a minor component of the food taken by stoat Mustela erminea, weasel M. nivalis, and pine marten Martes martes. Mink and otter strongly selected for frogs Rana spp. and avoided toads Bufo spp. However, the common toad can be an important prey for semiaquatic mustelids under unfavourable feeding conditions. Toads (mainly Bufo bufo, and rarely B. viridis) also occurred in significant numbers in the diets of polecats and badgers, which seemed to prey on frogs and toads with no clear selection.

7

Effect of felling on the distribution of rodents and their predators in a transitional mixed forest

51%

Sidorovich V. E., Solovej I. A., Sidorovich A. A., Rotenko I. I.

Polish Journal of Ecology

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2008

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tom 56

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nr 2

309-321

The influence of felling on the distribution of rodents and their predators in a transitional coniferous-deciduous forest in northern Belarus was investigated in relation to stand age, forest type, and soil richness. The study was conducted in two areas differing by top-grounds (clay and sand soils) and, in turn, having different habitat carrying capacities. Three forest parts were investigated: 1) 10%, 2) 20–30%, and 3) 40– 60% covered by recent clearcuts. Three age classes of the clearcuts, namely 1) less than 2 years old, 2) 2–5 years old and 3) 6–12 years old, were considered. In total, we obtained data on small rodent numbers in 84 clearcuts, and the data on predators – in 67 clearcuts and the woodland parts differed by logging rate. Eventually, we became convinced that felling generally led to an increase in the abundance and species richness of rodents and their predators and that was attributable in the clearcuts aged up to 12 years. First, logging led to higher densities of Apodemus mice, the red fox Vulpes vulpes L., weasel Mustela nivalis L., tawny owl Strix aluco L., common buzzard Buteo buteo L. and adder Vipera berus L. Also, with the increased felling rate Microtus voles and the longeared owl Asio otus L. penetrated in transitional woodlands. Too intensive forest harvesting (more than 40% of recent clearcuts) led to the decline in the populations of several predatory species such as the pine marten Martes martes L., Tengmalm’s owl Aegolius funereus L., Ural owl Strix uralensis Pall., and pygmy owl Glaucidium passerinum L. The decline in rodent predators found in the conditions of too intensive logging rate was different in the woodlands on sand and clay top-grounds. In the conditions of clay soil too intensive felling led to the pronounced decline of a marked part of the rodent predatory guild inhabiting woodlands, and the species densities decreased to the level that was lower than the initial one. Conversely, in initially poor habitats in the woodland on sandy deposits, logging of any rate led to the increase in numbers of rodents and their predators compared to undisturbed forest. But moderate logging was found to be the most favourable for the community there.

8

Seasonal and annual variation in the diet of the raccoon dog Nyctereutes procyonoides in northern Belarus: the role of habitat type and family group

51%

Sidorovich V. E., Solovej I. A., Sidorovich A. A., Dyman A. A.

Acta Theriologica

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2008

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tom 53

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nr 1

To study variation in the diet of the raccoon dogNyctereutes procyonoides Gray, 1834 in northern Belarus, 3299 scats were sampled from 18 localities differing in habitat quality. In one of the 18 localities, the dietary study was conducted for nine years. The data obtained was analysed according to seasonality, between-year difference, family specificity and habitat influence. In northern Belarus, the raccoon dog was found to be a generalist predator with omnivorous and opportunistic feeding habits. Their diet was highly variable, but a common trait was specialization on carrion in winter and on berries in late summer. Beside carrion and berries, the other seasonally important food items were frogs, insects, plant matter, mammals, and birds. The diet varied between seasons and habitats. In the warm season, habitat factors, such as type of soil (clay or sand), proportion of lakes and open grassy marshes, seemingly determine the food supply for raccoon dogs, and thereby influence the diet of individuals. The obtained results on dietary variation of raccoon dogs can be used in detailed analysis of the impact of this introduced species on native fauna and its role in functioning of vertebrate communities.

9

Winter distribution and abundance of mustelids and beavers in the river valleys of Bialowieza Primeval Forest

51%

Sidorovich V. E., Jedrzejewska B., Jedrzejewski W.

Acta Theriologica

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1996

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tom 41

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nr 2

Lutra lutra, Mustela vison, M. putorius, M. erminea, M. nivalis, and the settlements of Castor fiber were surveyed along 170 km of rivers in Białowieża Primeval Forest (Poland and Belarus), the best preserved temperate lowland forest in Europe. The censused rivers varied from very small (1-5 m wide, < 1 m deep) to medium-sized (11-15 m wide, up to 3 m deep). Mustelids were counted by tracks left in snow. Mean index of abundance of otters was 2.2 inds/10 km of the river bank (range 0-5) and that of mink 4.6 inds/10 km (range 0-7.5). On average, 1.4 polecats/10 km were recorded (range 0-5). Otters and mink were most abundant on the medium-sized rivers and least numerous on very small ones. Polecats lived predominantly on very small rivers. Species structure of a predator guild varied with river size. On average, 5.1 stoats and 4.0 weasels were counted per 10 km of river bank. Stoats were twice as common along rivers with open marshy flood-plain as along rivers with forested valleys. On average, 2.9 beaver settlements were recorded per 10 km of river bank (range 0-5). Habitat niche overlaps were highest between otter and mink, and stoat and mink. The smallest overlaps were between the polecat and all other predators. Densities of mustelid predators and beavers in Białowieża Primeval Forest were similar to those in other fairly well preserved woodlands in Europe,

10

Molecular biogeography of red deer Cervus elaphus from eastern Europe: insights from mitochondrial DNA sequences

27%

Niedzialkowska M., Jedrzejewska B., Honnen A.-C., Otto T., Sidorovich V. E., Perzanowski K., Skog A., Hartl G. B., Borowik T., Bunevich A. N., Lang J., Zachos F. E.

Acta Theriologica

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2011

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tom 56

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nr 1

European red deer are known to show a conspicuous phylogeographic pattern with three distinct mtDNA lineages (western, eastern and North-African/Sardinian). The western lineage, believed to be indicative of a southwestern glacial refuge in Iberia and southern France, nowadays covers large areas of the continent including the British Isles, Scandinavia and parts of central Europe, while the eastern lineage is primarily found in southeast-central Europe, the Carpathians and the Balkans. However, large parts of central Europe and the whole northeast of the continent were not covered by previous analyses. To close this gap, we produced mtDNA control region sequences from more than 500 red deer from Denmark, Germany, Poland, Lithuania, Belarus, Ukraine and western Russia and combined our data with sequences available from earlier studies to an overall sample size of almost 1,100. Our results show that the western lineage extends far into the European east and is prominent in all eastern countries except for the Polish Carpathians, Ukraine and Russia where only eastern haplotypes occurred. While the latter may actually reflect the natural northward expansion of the eastern lineage after the last ice age, the present distribution of the western lineage in eastern Europe may in large parts be artificial and a result of translocations and reintroduction of red deer into areas where the species became extinct in historical times.

Ograniczanie wyników

Relationship between prey availability and population dynamics of the Eurasian lynx and its diet in northern Belarus

Reproductive plasticidy of the American mink Mustela vison in Belarus

Structure, reproductive status and dynamics of the otter population in Byelorussia

Porównawcza morfometria allometryczna czaszki norki (Mustela vison Schreber, 1777) pochodzenia kanadyjckiego i białoruskiego; status taksonomiczny

Reproduction in otters in Belarus and north-western Russia

Toads Bufo spp. in the diets of mustelid predators in Belarus

Effect of felling on the distribution of rodents and their predators in a transitional mixed forest

Seasonal and annual variation in the diet of the raccoon dog Nyctereutes procyonoides in northern Belarus: the role of habitat type and family group

Winter distribution and abundance of mustelids and beavers in the river valleys of Bialowieza Primeval Forest

Molecular biogeography of red deer Cervus elaphus from eastern Europe: insights from mitochondrial DNA sequences