Wyniki wyszukiwania

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Changements recents des comportements demographiques et residentiels dans les aires industrialisees de Toscane

100%

Formentini U.

Geographia Polonica

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1995

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tom 64

2

Territorial differentiation of demographic development level of the city, the case of Cracow

88%

Zborowski A.

Geographia Polonica

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1993

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tom 61

3

Urban demographic transition

75%

Dumont G.-F.

Urban Development Issues

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2017

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tom 56

4

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From the region attracting to the region pushing out the population (on the example of the Silesian voivodeship)

75%

Rakowski W.

Economic and Regional Studies

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2022

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tom 15

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nr 2

5

The demographic status of and perspectives for the Russian Federation

75%

Eberhardt P.

Geographia Polonica

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2000

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tom 73

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nr 1

6

Demography of woodland rodents in fragmented habitat

75%

Rajska-Jurgiel E.

Acta Theriologica

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1992

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tom 37

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nr 1-2

Populations of two species of woodland rodents were studied: Apodemus flavicollis (A. f.) and Clethrionomys glareolus (C. g.)t inhabiting a set of small wood patches, isolated from large, continuous forest. The species composition, density and population dynamics differed from those in the forest. The rodents used the entire area as a patchy habitat, moving between the woodlots. In the breeding season high mobility caused higher mortality among males, especially in C. g. Sex ratio in C. g. was female biased. In A. f. females prevailed in spring whereas there was a prevalence of males in autumn. Seasonal changes in age structure followed different patterns in females and males. Males prevailed in first spring litters in both species. Males also prevailed among numerous immigrants of A. f. but females prevailed among immigrants of C. g. The demographic processes in these species resulted from habitat fragmentation and different life strategies.

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Demography, density, and survival of an endemic and near threatened cottontail Sylvilagus cunicularius in Central Mexico

75%

Gonzales J., Lara C., Vazquez J., Martinez-Gomez M.

Acta Theriologica

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2007

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tom 52

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nr 3

A 3-year live trapping investigation was carried out in a temperate forest in central Tlaxcala, México from 2002 to 2004. During a total of 504 trap nights, 87Silvilagus cunicularius Waterhouse, 1848 individuals were captured and marked, and age-specific survival models using demographic parameters were tested using the JOLLYAGE program. We evaluated population density of this species over a 1-year period. The age structure of the population varied among years, and the proportion of adults was relatively constant among years, whereas the proportion of juvenile showed high fluctuations. The sex ratio of juveniles that were recaptured as adults, did not differ from unity neither did the sex ratio for adults. We found no sex bias among cottontails during all 3 years of the study. When data for both sexes were combined, mean survival probability of juveniles was lower than that of adults. Although our line transect counts showed a mean density of 27 ± 5.4 individuals per km2, the obtained results from trapping suggests that this species is low in abundance at La Malinche. Further studies are needed to evaluate demographical aspects of this species at different protected and unprotected areas to obtain robust information about their status.

8

Changes in the life strategy of Carex digitata [ Cyperaceae ] in disturbed woodland communities: II. Demography

75%

Laska G.

Fragmenta Floristica et Geobotanica

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1996

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tom 41

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nr 1

9

Demography of fluctuating prairie vole populations: comparison of demographic variables among phases of fluctuations

75%

Getz L. L., Oli M. K., Hofmann J. E., McGuire B.

Acta Theriologica

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2007

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tom 52

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nr 3

We tested for differences in the proportion of reproductively active males and females, proportion of the population composed of young and immigrants, and monthly survival (total, adult, young) among phases (trough, increase, and decline) and among habitats (alfalfa, bluegrass, and tallgrass) of 30 population fluctuations ofMicrotus ochrogaster Wagner, 1842 over 25 years in east-central Illinois USA. Total population survival and survival of adults and young were greatest during the increase phase, among fluctuations, irrespective of habitat. The proportion of reproductively active adult males and females was lowest during the decline phase, an effect of lower reproduction during the winter. These results suggest that phase-specific changes in survival were the primary demographic factor driving population fluctuations ofM. ochrogaster in our study sites. We conclude that small-scale spatially different population fluctuations may be explained by the same mechanisms that explain fluctuations within a population.

10

Intra-urban migration and declared migration preference movements in Prague

75%

Drbohlav D.

Geographia Polonica

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1993

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tom 61

11

Factors influencing the distribution of the bank vole in forest habitats

75%

Mazurkiewicz M.

Acta Theriologica

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1994

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tom 39

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nr 2

In mosaics of forest environment the bank vole Clethrionomys glareolus {Schreber, 1780) prefers patches with dense vegetal cover like understorey or tail herbaceous plants, like ferns or sedges. The size and intensity of the space use, the rate of colonization of free space with population increases and mean home range size are highest in habitats, or their parts, covered uniformly by this type of vegetation. Habitats with dense and uniform understorey characteristically support high vole densities, high numbers of sexually active individuals, high survival rates of individuals entering the population at the beginning of the reproductive season, a high emigration during the second half of the season and a low immigration. Voie populations in habitats of poor and clumped understorey are characterized by low densities, high immigration of individuals entering to the population during the second half of the season and a high turnover of individuals. It has been suggested that vole distribution in a mosaic of forest habitats depends upon the abundance of structural elements of the habitat that may serve as defensive structures against predators.

12

A reanalysis of apparent survival rates of Indiana myotis (Myotis sodalis)

63%

Boyles J. G., Walters B. L., Whitaker,Jr. J. O., Cope J. B.

Acta Chiropterologica

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2007

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tom 09

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nr 1

The estimation of demographic rates is important for conservation and management of species. However, with the exception of an estimate for adult survival by Humphrey and Cope in 1977, there are no estimates of any demographic rates for the endangered Indiana myotis (Myotis sodalis). Their estimate is based on techniques that have been replaced by newer, more flexible, and less biased techniques. Therefore, we reanalyzed a subset of the data first analyzed by Humphrey and Cope using a Cormack-Jolly-Seber model. Two models [φ(year)p(year) and φ(year)p(sex*year)] are equally parsimonious, so we used model averaging to estimate apparent survival. We used this estimate to calculate the average cumulative survival each year after banding for four un-aged cohorts. Our estimate suggests that apparent survival is considerably higher than estimated by Humphrey and Cope the first year after banding and lower the second year after banding. Subsequent to the first two years after banding, our estimates are similar, but slightly lower than those reported by Humphrey and Cope. These results, while useful, cannot be taken as true survival rates for Indiana myotis because of limitations in the data and we suggest this estimate be used appropriately when making management decisions. We discuss limitations in this type of data and make suggestions for experimental design of future studies to collect data more appropriate for estimation of demographic rates in bats.

13

Relationships among ecology, demography and diseases of European bison (Bison bonasus)

63%

Kita J., Anusz K., Zaleska M., Malicka E., Bielecki W., Osinska B., Kowalski B., Krasinski Z., Demiaszkiewicz A., Rhyan J., Kolipinski M.

Polish Journal of Veterinary Sciences

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2003

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tom 06

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nr 4

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Population dynamics and demography of deermice [Peromyscus maniculatus] in heterogeneous habitat: role of coarse woody debris

63%

Lee S. D.

Polish Journal of Ecology

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2004

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tom 52

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nr 1

I tested the hypothesis that habitat heterogeneity increases with increasing amounts of coarse woody debris (CWD) by comparing Peromyscus maniculatus populations in sites with high and low amounts of CWD. Sherman live-trapping technique was applied to monitor population fluctuation and to measure demographic parameters. In sites with high amount of CWD density was higher, populations fluctuated less, survivorship was better and residency time was longer. These results were in accordance with predictions of habitat heterogeneity and CWD played an important role for demography of P. maniculatus in managed coniferous forests.

15

The bank vole population in Crabapple Island

63%

Bujalska G.

Polish Journal of Ecology

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2000

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tom 48

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nr Suppl.

16

Population demography of Oxymycterus rufus [Rodentia: Cricetidae] inhabiting a patchy environment of the delta of the Parana River, Argentina

63%

Cueto V. R., Piantanida M. J., Cagnoni M.

Acta Theriologica

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1995

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tom 40

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nr 2

We employed a live-trapping grid encompassing several discrete vegetation patches to analyze spatial differences in the demographic structure of an Oxymycterus rufus (Fischer, 1814) population living on the delta of the Parana River, Argentina. Abundance, residence and reproduction of both females and males have been associated with microhabitats where food (measured through the availability of arthropods) was more abundant, and were not associated with the plant cover of those microhabitats. Our results emphasize the importance of food availability in the spatial distribution of resident and reproductive individuals, and hence in the survival and breeding success of their populations in the Parana delta area.

17

Shrinking East German cities?

63%

Lotscher L.

Geographia Polonica

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2005

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tom 78

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nr 1

18

Some effects of demographic and socio-economic changes on the internal population structure of the city. The example of Bonn [FRG]

63%

Kemper F. J.

Geographia Polonica

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1993

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tom 61

19

The decline of the Bullfinch Pyrrhula pyrrhula in Britain: is the mechanism known?

63%

Siriwardena G. M., Freeman S. N., Crick H. Q. P.

Acta Ornithologica

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2001

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tom 36

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nr 2

The Bullfinch has declined in Britain and elsewhere in Europe, but definitive evidence about the cause and demographic mechanism has yet to be published. We review current knowledge, concentrating on analyses of demography, and present new integrated population modelling analyses designed to reveal the demographic changes most important in the decline. It is likely that changes in brood size and clutch size have not been important and our models suggest that the decline can be explained without invoking variation in numbers of breeding attempts or post-fledging survival rates. However, although changes in the egg period daily nest failure rate provide the best explanation for population change during the years of steepest decline, nestling period failures, adult survival and first-year survival could all have been equally important. Egg period nest failure rates have been higher in the preferred habitat, woodland, than in farmland and have fallen over time in farmland, where a larger decline has occurred (65% versus 28%), arguing against a causal link with abundance. Despite evidence for a negative effect of agricultural intensification on Bullfinch presence, little evidence exists clearly linking any demographic rate to environmental change and agricultural land-use has had little effect on nest failure rates. Predation appears to have had no significant impact. Future work should focus on contemporary investigations of the importance of hedgerow structure and woodland understorey vegetation.

20

Urban dynamics and life cycle of Madrid's population

63%

Ballesteros A. G.

Geographia Polonica

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1993

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tom 61

Ograniczanie wyników

Changements recents des comportements demographiques et residentiels dans les aires industrialisees de Toscane

Territorial differentiation of demographic development level of the city, the case of Cracow

Urban demographic transition

From the region attracting to the region pushing out the population (on the example of the Silesian voivodeship)

The demographic status of and perspectives for the Russian Federation

Demography of woodland rodents in fragmented habitat

Demography, density, and survival of an endemic and near threatened cottontail Sylvilagus cunicularius in Central Mexico

Changes in the life strategy of Carex digitata [ Cyperaceae ] in disturbed woodland communities: II. Demography