Preferencje help
Widoczny [Schowaj] Abstrakt
Liczba wyników

Znaleziono wyników: 23

Liczba wyników na stronie
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 2 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników

Wyniki wyszukiwania

help Sortuj według:

help Ogranicz wyniki do:
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 2 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników
Communications routes and other anthropogenic barriersfor animals populations functioning. Each species requires certain amount of suitable habitat to fulfill its life needs. There are natural barriers for spreading the animals populations. For last 200 years anthropogenic changes of environment create another serious barriers. The main results of man activities can be degradation and habitat loss, creation of linear structures as roads and railways that divide animal populations. The lack of gene flow may lead to changes within isolated populations ending even with extinction. Transport infrastructure influences on the animals ability of migration. Directly it can cause deaths on road, habitat changes and indirectly lack of population connectivity, habitat fragmentation, pollution, increased human pressure. To avoid above the proper passages according to size and behavior of animal should be created. Next important anthropogenic factor changing animals environment is agriculture intensification. It causes serious threats for biodiversity: landscape homoge-nization, habitat destruction, land abandonment. Among others, the main other factors influencing animals population are: urbanization, land reclamation, alien species. Poland's environment is much better preserved comparing to Western Europe and there is still chance not to destroy it.
‘Water Framework Directive’ stresses the maintaining of good ecological status of water ecosystems as well as holistic approach to water resources management. The aim of the study was to determine the possibilities of joint management measures of ecological and hydrological management of two small lowland river catchments: Zagożdżonka and Zwoleńka rivers, located in central Poland. Both are natural rivers, with lots of meanders and abounding biodiversity of extensive agriculture and forest areas. The field investigations were carried out to describe the habitat preferences of amphibians in two analyzed river catchments and to record the hydrological values of the catchments. During considered period the hydrological condition were above average (more wet) in a sense of rainfall and runoff. During the whole observation period nine amphibian species were recorded: Rana esculenta complex, R. temporaria, R. arvalis, Bufo bufo, Hyla arborea, Pelobates fuscus, Triturus vulgaris, Bombina bombina and Triturus cristatus. The most important species occurring in investigated catchments, listed in II Annex to Habitat Directive that require protection inside Natura 2000 sites are Triturus cristatus and Bombina bombina.
The habitat preferences of amphibians in the catchment area of the Zagożdżonka River. The habitat preferences of amphibians in the catch­ment area of the Zagożdżonka River. The aim of the study was to describe habitats of amhibians in the small river Zagożdżonka catchment, situated in Central Poland, in the area of Kozienicki Land­scape Park. The occurrence of amphibians was recorded in relation to water and terrestrial habitat features. The observations were carried out at 16 transects. The presence of 7 species of amphi­bians, common to lowlands was recorded. Higher number of species was stated in ponds or reservo­irs without running water, with rather small size. The most common species were Rana esculenta complex and Rana temporaria. The breeding of Triturus cristatus, the endangered species within Europe territory, was recorded at four transects. Authors suggest to continue research on amphibians in this area to find what is the influence of human activities on this group of animals.
Characteristic of population and working of earthdogs in Poland in 2001-2007. The aim of this paper is to describe the population and working abilities of earthdogs in Poland during 7 years period: from 2001 to 2007. In Poland 15 breeds are considered as earthdogs: 9 Dachshunds and 6 Terriers. Data concerning number of registered dogs of each breed, reproductive characteristics and the results of field trials for earthdogs were analyzed. The most popular breed among all earthdogs is Dachshund wire hair standard and among all Terriers: German Terrier. The population of all Dachshunds breeds was de­creasing from year to year. Terrier population was increasing slightly, mainly due to huge interest in Jack Russell Terrier. Both trends are significant. Other Terriers seem to have stable populations. The most numerous breeds have also the highest reproductive characteristics. The highest number of litters and puppies born was observed for Ger­man Terrier and Dachshund wire hair standard. Each year more Dachshunds than Terriers participated in earthdogs field trials and obtained better grades. The use of earthdogs should be promoted as a useful tool to reduce the fox population in Poland.
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 2 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników
JavaScript jest wyłączony w Twojej przeglądarce internetowej. Włącz go, a następnie odśwież stronę, aby móc w pełni z niej korzystać.