Wyniki wyszukiwania - Biblioteka Nauki

1

Consequences of human overpopulation and strategies of its prevention

100%

Ferdynus M.

Studia Ełckie

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2018

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tom 20

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nr 4

415-

EN

The sense of threat resulting from the potential overpopulation of our globe is not a new phenomenon. As early as in ancient times, philosophers raised concerns over the excessive number of people that could disturb the stability of the state. Looking at the current demographic situation in the world, the author of the paper focuses on potential consequences of human overpopulation as well as various strategies of preventing the negative consequences of this phenomenon. The conducted analyses show that the reduction of poverty is a morally uncontroversial method of overcoming difficulties related to the growing number of inhabitants of our planet.

2

Characteristics of populations of narrow-clawed crayfish Pontastacus leptodactylus in three Belarusian lakes of the Baltic sea catchment area

63%

Alekhnovich A.

Baltic Coastal Zone. Journal of Ecology and Protection of the Coastline

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2021

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tom 25

3

Relative roles of density and rainfall on the short-term regulation of Mediterranean wood mouse Apodemus sylvaticus populations

63%

Diaz M. , Torre I. , Arrizabalaga A.

Acta Theriologica

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2010

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tom 55

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nr 3

251-260

EN

This study aims to quantify the relative effects of density-dependent (feedback structure) and density-independent climatic factors (rainfall) in regulating the short-term population dynamics of wood mice Apodemus sylvaticus Linnaeus, 1758 in three Mediterranean forest plots. Rainfall and density explained additively 62% of variation in population growth rates (38 and 24%, respectively), with no differences among study plots. Population growth rate was positive during autumn–winter and negative during spring–summer during a 2.5-year period. Population rate of change was negatively affected by wood mouse density during the normal breeding season of Mediterranean mice (autumn–winter) but not outside it. Growth rate was positively affected by the cumulative amount of rainfall three months before the normal breeding season, but not during it. Female breeding activity and recruitment did not differ among plots, and was not affected by density or rainfall. However, recruitment was positively affected by density and, marginally, by rainfall. Our results suggest that intraspecific competition (density-dependence) and food availability (rainfall) are equally important factors driving wood mouse population dynamics in Mediterranean forests. Mechanisms underlying density-dependence during the breeding season seemed to be based on food-mediated survival rather than on behaviourally-mediated reproduction. Taken together, these results indicate a high sensitivity of marginal Mediterranean wood mouse populations to the expected climate changes in the Mediterranean region.

4

Application of matrix population models to anadromous coregonid life cycles

63%

Morin R. , Doidge D. W.

Polskie Archiwum Hydrobiologii

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1992

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tom 39

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nr 3-4

5

Porównanie wskaźników wzrostu populacji Glycyphagus destructor (Schr.) i Glycophagus domesticus (De Geer) (Glycyphagidae, Acarina) w podobnych warunkach otoczenia

51%

Chmielewski W.

Zeszyty Problemowe Postępów Nauk Rolniczych

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1990

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tom 373

RU

Благоприятные жизненные условия для Glycyphagus destructor ( Scbr.) обеспечиваются температурой 20-25°С и относительной влажностью воздуха 75-85%, а для G. domesticus ( De Geer) температурой 15-25°С и относительной влажностью воздуха сходной с представленной для первого вида. Цикл развития G. destructor продолжается 13 дней в температуре 25°С и влажности воздуха 85%. Самко сносит в среднем 140,2 яичек. Показатели развития популяции последнего вида сравнительно высокие, в частности; Rₒ - темпы репродукции нетто 69,54, rₘ - врожденные темпы увеличения популяции (в течение дня) 0,126; R - конечные темпы умножения численности популяции (самок на самку и день) 1,134. Показатели для G. domesticus в тех же условиях несколько ниже и составляют: Rₒ = 53,74, rₘ - 0,116, R - 1,123. Развитие особей G. domesticus происходит в среднем в период от 15,2 дней в температуре 25°С и влажности воздуха 85% до 33,5 дней в 15°С и влажности воздуха 85%. Самая высокая плодовитость указанного вида составляет в среднем 118,5 яичек в период всей жизни самки в оптимальных условиях т - средняя продолжительность жизни одной генерации (дней) у обоих указанных видов, особенно в низких температурах (5°С) для G. destructor составляет 123,67, а для G. domesticus 101,75.

EN

Favourable life conditions for Glycyphagus destructor (Schr.) are: temperature of 20 to 25°С and relative humidity of 75 to 85 per cent, and for Glycyphagus domesticus (De Geer) - temperature 15-25°С and relative humidity - 75-85%. The life cycle of G. destructor was completed in 13,0 days at 25°С and relative humidity of 85%. The female lays on the average 140.2 eggs. Factors of increase of population of this species are relatively high under these conditions: Rₒ - net reproduction rate = 69,54, rₘ - innate capacities for increase (per day) = 0,126, λ - finite rates of increase (females per female a day) = 1.134. These factors for G. domesticus under the same conditions are a little lower than in G. destructor: Rₒ = 53,74, rₘ = 0,116, λ = 1,123. The life history of G. domesticus takes, on the average, from 15.2 days at the temperature of 25°C and relative humidity 85%, to 33,5 days at 15°С and 85% R. H. The highest fecundity of this species amounts, on the average 118,5 eggs per female in its whole life under optimum conditions. T - mean length of generations (in days) of both the species are long, especially at a low temperature (5°С): for. G. destructor T = 123,67, for G. domesticus T = 101.75.

6

Numbers, distribution and population changes of the Tatra chamois Rupicarpa rupicarpa tatrica Blahout, 1971

51%

Jamrozy G. , Peksa L.

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tom 60

63-73

7

Population parameters for almond moth (Cadra cautella Wlk.) (Lepidoptera: Phycitidae) reared on natural products

44%

Nawrot J.

Prace Naukowe Instytutu Ochrony Roślin

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1979

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tom 21

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nr 2