This study describes the male and female role in parental care in a Norwegian population of reed buntings (Emberiza schoeniclus). The population has an extensive level of extra-pair young (EPY), with 30% of the offspring ...

ABSTRACT Small, isolated and fragmented bird populations are more vulnerable to extinction and studies have shown that they can have a high proportion of unpaired males. Female-biased natal dispersal could be an explanation ...

According to the differential allocation hypothesis, an individual will invest more in an offspring when mated to a high than low qality mate. The blue/green eggshell coluration of pied flycatcher (Ficedula hypoleuca), has ...

I dette studiet har jeg undersøkt i hvilken grad lengdefordelingen for 0+ ørret Salmo trutta ved vekstsesongens slutt kan forklares med variasjon i tetthet ( 0+, eller eldre ørret) og ulike miljøvariabler som varierer ...

Altricial nestlings hatch at an early stage of development, and depend on their parents to feed them. The quality of the parental care is of great significance to the nestlings fitness and future survival. In the early ...

The Red Queen hypothesis states that biological entities rather than abiotic factors constitute the larger part of the selective environment experienced by individual organisms, and that species as a consequence undergo ...

We studied a willow warbler (Phylloscopus trochilus) population breeding in Øvre Heimdalen, in Valdres, Norway. Several previous studies have found large differences in the amount of EPY (extra- pair young) in the broods ...

There is considerable controversy regarding the effect of sheep grazing on reindeer populations in Norway. Sheep grazing during summer may affect the critical fall, winter and spring range conditions for reindeer either ...

The presence of gastrointestinal nematodes is considered to be a problem in domestic cattle, and various studies have tried to present reasons for and solutions to this problem. A study was conducted in Southern Norway in ...

Recent advances in molecular genetic techniques have made it possible to genotype DNA extracts from non-invasive samples such as hair, faeces, and urine. Subsequent identification of individuals from such material has ...

The feeding behavior is favored by natural selection in the past and is based on getting a high fitness by maximizing net energy intake. Reproductive success among altricial birds is closely related to feeding strategies ...