Preferencje help
Widoczny [Schowaj] Abstrakt
Liczba wyników

Znaleziono wyników: 19

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

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
Two family-groups of wood mice Apodemus sylvaticus (Linnaeus, 1758) were ob­served: one in the laboratory (terrarium 100 x 60 x 60 cm) and the other under enclosure conditions (outdoor enclosure 200 x 100 x 100 cm). Three consecutive periods in the social relations of the family-groups were described: the linear hierarchy, the multidirectional social relations, and the variable dominance-subordination relations. The linear social hierarchy was reflected in the subordination behaviour of family members in relation to the dominant male, the father of the family. During the period of coexistence of a pair of parents with two litters of juveniles, both in the laboratory and under enclosure conditions, amicable relations between individuals occurred. Advanced forms of social care (paternal care, allomaternal lactation, transportation and licking by relatives) were also observed. In the laboratory, agonistic interactions were lacking during the linear hierarchy period, but the attainment of sexual maturity by individuals of the first two litters, accompanied by an increase in the number of mice, resulted in aggression between mature males and competition for dominance. Further, under increasingly crowded conditions, agonistic behaviour prevailed over other types of social interaction, and the survival rate of juveniles decreased. Under enclosure conditions a seasonal variation in agonistic interaction between mature individuals was recorded, similar to that observed in the wild. Despite the systematic increase in population density, no attacks by mature males on juveniles were observed.
We assess if survey of containers discarded by people (and collected within environmental cleanup actions) may be an useful method in detection of small mammal species and how different parameters of containers affect mammal mortality. The discarded containers without stoppers were collected from two sites (one forest and one agricultural) in western Poland. In 13 bottles (out of 288 collected containers), 58 specimens belonging to 10 species were found. Remains were found mostly in color glass bottles with mouth diameter 18–31 mm and 0.5–5.0 l capacity. We detected only six small mammal species during four short-term live-trapping sessions performed in the same sites. Thus, we suggest that the survey of discarded bottles may be an efficient complement to traditional scientific methods (as live-trapping), which can be performed by both specialists and amateurs, who, at the same time, would clean the environment of the ecological traps.
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.