Preferencje help
Widoczny [Schowaj] Abstrakt
Liczba wyników

Znaleziono wyników: 12

Liczba wyników na stronie
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 1 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych:  Pipistrellus pygmaeus
help Sortuj według:

help Ogranicz wyniki do:
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 1 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników
The number of orientation, feeding and social calls emitted by pipistrelle batsPipistrellus pipistrellus Schreber, 1774 andP. pygmaeus Leach, 1825 was recorded throughout the night at eight different sites. Social calls were unaffected by weather variables, whereas orientation calls and feeding buzzes were both significantly affected by cloud and temperature conditions. The number of emissions of each call type was significantly different between sites, indicating that the bats used different sites for different activities. Significant positive correlations between all three combinations of call types occurred only during the middle of the night, corresponding with the nadir of flying insects. This suggests that bats were engaged in activities other than feeding at this time, such as territory protection or mate attraction.
The identification of two cryptic bat species of the genus Pipistrellus using a non-destructive and quick method of multiplex PCR and agarose gel electrophoresis is described. Two primer combinations were able to produce species-specific bands that identified reliably individuals that were previously identified by mtDNA sequencing. Robustness of the method was subsequently successfully tested on 16 randomly selected free-living animals from central Europe (tissue samples obtained from a 3 mm punch of wing-membrane) identified to species on the basis of echolocation calls. Nine out of 15 museum specimens and 100% of fresh faecal samples from seven individuals were also successfully identified by this method. The described method thus provides a good way to routinely distinguish two Pipistrellus species by using non-destructive sampling of living individuals or droppings, and will be used in field studies of their ecology.
The changes in echolocation behaviour and the structure of calls ofPipistrellus pygmaeus (Leach, 1825) were studied in different habitats of a floodplain forest in south-eastern Moravia (Czech Republic) in 2001–2002. Calls (403 observations) were recorded in different sites between April and mid June (before weaning) using a time expansion bat-detector. Three signals per individual were analysed and descriptive statistics of variables of calls were presented. Association of signal types with habitat structure (cluttered, side-cluttered, semi-cluttered and uncluttered space) was found in echolocation sequences of the search phase of flight.P. pygmaeus used mainly narrowband signals (bandwidths less than 15 kHz) in uncluttered space and wideband signals (more than 15 kHz) in cluttered space. Almost 6% of the inter pulse intervals of signals were twice (or more) longer than usual inter pulse intervals (mainly in uncluttered space). In general, temporal variables of signals reached higher values in uncluttered spaces (except for inter pulse interval) than in cluttered ones. On the contrary, spectral variables of signals reached lower values in uncluttered habitats in comparison with cluttered ones. In addition, the signals were less variable in open spaces while in cluttered and partly-cluttered habitats different and higher variability was found. We also studied the accuracy of identification of pipistrelles by call parameters and possible misidentifications in relation to habitat structure. Multivariate discriminant analyses were carried out on the time and frequency parameters of calls produced by pipistrelles.
W lasach, w drzewostanach młodych i monokulturach, stosuje się sztuczne skrzynki dla nietoperzy wykonane z drewna lub trocinobetonu. Łącznie w 2001 i 2005 r. na terenie Szczecińskiego Parku Krajobrazowego „Puszcza Bukowa” powieszono 60 budek drewnianych i 154 budek trocinobetonowych dla nietoperzy.W wyniku kontroli w 2007 r. stwierdzono wysoki stopień (ca 90%) zasiedlenia skrzynek trocinobetonowych.W zinwentaryzowanych sztucznych kryjówkach stwierdzono obecność 5 gatunków nietoperzy.
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 1 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.