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Environmental correlates of nest site selection by wild boar Sus scrofa

100%

Fernandez-Llario P.

Acta Theriologica

2004

tom 49

nr 3

Location of nests, built by free-living wild boars Sus scrofa Linnaeus, 1758, was analysed in order to assess the importance of environmental and social conditions in piglets' survival during the first days after birth. The research was carried in a Mediterranean forest with different habitats and high density of natural predators. The results indicate that most nests were already constructed before the beginning of March, being located preferentially in areas with: (1) abundant plant cover, (2) water nearby and (3) a warmer temperature than in other places. These results suggest that female wild boar try to diminish mortality caused by natural predators by constructing their nests in places with dense cover. Water is very important because of the females' new necessities derived from milk production. Warm nesting places might diminish deaths after birth in a species with important thermoregulation deficiencies. The distance between nests is also important because in this period the wild boar develops a territorial behaviour, possibly with the objective of establishing bonds between the mother and her offspring before returning to the familiar units made up of several females and their piglets, all of them of a similar age.

Growth rate and development in infant Natterer's bat (Myotis nattereri) reared in a flight room

84%

Swift S. M.

Acta Chiropterologica

2001

tom 03

nr 2

Myotis nattereri born and reared by their mothers in a flight room had a mean birth body mass of 3.4 g and forearm length of 17.00 mm. Infants opened their eyes at 6 days old, and they were no longer always found roosting attached to their mothers after this age. They were fully furred at 7-8 days and began to flap their wings at days. Growth was initially rapid and linear until 20 days of age and then slowed. At 58-60 days, mean body mass was 8.8 g (89% of adult mass) and mean forearm length was 40.55 mm (98% of adult length). Juveniles began to fly at 20 days, at which age their forearm length was 93.4% of mean adult value. Forearm data were best fitted by the logistic growth model (k = 0.18; asymptotic length = 40.79 mm for males) and body mass data by the von Bertalanffy equation (k = 0.10; asymptotic mass = 8.42 g for males). Pre-flight growth and development rates were similar to those in other British vespertilionid bats, but M. nattereri showed very rapid development of foraging ability after they began to fly. Mothers suckled only their own infants and transported flightless young between roost boxes, on average every 5.3 days.

Ograniczanie wyników

1 Acta Chiropterologica

1 Acta Theriologica

1 Fernandez-Llario P.

1 Swift S. M.

1 2004

1 2001

Wyniki wyszukiwania

Environmental correlates of nest site selection by wild boar Sus scrofa

Growth rate and development in infant Natterer's bat (Myotis nattereri) reared in a flight room