Results
repositories = "University of Oulu Repository - Jultika"
> : "Oulun yliopisto, Luonnontieteellinen tiedekunta, Biologian laitos"
(x)
Nutritional and genetic adaptation of galliform birds: implications for hand-rearing and restocking
Author(s) :
Liukkonen-Anttila, Tuija
Description :
Abstract
The impact of hand-rearing on the morphology and physiology of captive and wild grey partridges (Perdix perdix) and capercaillies (Tetrao urogallus) was studied in three feeding trials conducted under laboratory conditions, and two comparative studies between wild and captive birds. Finall...
Repository :
University of Oulu Repository - Jultika
Language(s) :
Undetermined
Restorative mowing on semi-natural grasslands: community-level changes and species-level responses
Author(s) :
Huhta, Ari-Pekka
Description :
Abstract
This thesis operates at two levels of ecological research, describing the effects of withdrawal and
re-introduction of management on grasslands. The aim of the community-level survey was to explore the effects of
abandonment, mowing and grazing on semi-natural meadows in northern Finland...
Repository :
University of Oulu Repository - Jultika
Language(s) :
Undetermined
Endophytes in the buds of Scots pine (Pinus sylvestris L.)
Author(s) :
Mattila née Pirttilä, Anna Maria
Description :
Abstract
Although microbes are generally found as endophytes in many plant tissues,
the plant shoot meristems have been considered virtually sterile. Plant tissue
culture, which utilizes mostly the meristems, has nevertheless given numerous
references to microbial existence in these tissues. Sin...
Repository :
University of Oulu Repository - Jultika
Language(s) :
Undetermined
Landscape responses of the Siberian flying squirrel (Pteromys volans) in northern Finland : the effect of scale on habitat patterns and species incidence
Author(s) :
Reunanen, Pasi
Description :
Abstract
Spatial structure of habitats has been found to affect the species
abundance and distribution patterns in heterogeneous environments. In this
thesis, I studied landscape responses of the Siberian flying squirrel in a
boreal forest context in northern Finland. Studies were conducted at
...
Repository :
University of Oulu Repository - Jultika
Language(s) :
Undetermined
Thermogenic mechanisms during the development of endothermy in juvenile birds
Author(s) :
Marjoniemi, Kyösti
Description :
Abstract
The use of regulatory and obligatory heat production mechanisms were
studied in
juvenile birds during the development of endothermy.
The development of shivering thermogenesis was studied in the pectoral and
gastrocnemius muscles of the altricial domestic pigeon and in three precocial ...
Repository :
University of Oulu Repository - Jultika
Language(s) :
Undetermined
Productivity of the semi-domesticated reindeer (Rangifer t. tarandus L.) stock and carrying capacity of pastures in Finland during 1960-1990's
Author(s) :
Kumpula, Jouko
Description :
Abstract
Although the present day management of semi-domesticated reindeer
(Rangifer t. tarandus L.) and its operational environment
have changed from the past, knowledge of the ecological mechanisms typical of
traditional herding is still important. The main objective of this study was to
exam...
Repository :
University of Oulu Repository - Jultika
Language(s) :
Undetermined
Contribution of X chromosomal and autosomal genes to species differences in male courtship songs of the Drosophila virilis group species
Author(s) :
Päällysaho, Seliina
Description :
Abstract
In sympatric Drosophila species, songs produced by male wing
vibration during courtship are an effective mechanism preventing interspecific
matings and maintaining sexual isolation between different species. These songs
can vary greatly even between closely related species. The aim of ...
Repository :
University of Oulu Repository - Jultika
Language(s) :
Undetermined
Reindeer grazing and soil nutrient cycling in boreal and tundra ecosystems
Author(s) :
Stark, Sari
Description :
Abstract
In northernmost Fennoscandia, grazing by reindeer
(Rangifer tarandus L.) has a substantial impact on
the vegetation of boreal forests and arctic-alpine tundra heaths, which
are reflected in below-ground processes, such as nutrient mineralization
and soil organic matter decomposition. I...
Repository :
University of Oulu Repository - Jultika
Language(s) :
Undetermined
Tree - cover crop interactions: birch growth, competition and soil properties
Author(s) :
Hänninen, Kaarina
Description :
Abstract
The main objective of this thesis was to investigate tree - cover crop interactions and soil response in an intercropping system, in which leguminous and grass cover crops were used with birch (red-leaved Downy birch Betula pubescens L.). The investigation was conducted in two field experi...
Repository :
University of Oulu Repository - Jultika
Language(s) :
Undetermined
Regeneration by seeds and vegetation structure in alpine plant communities, subarctic Finland
Author(s) :
Welling, Pirjo
Description :
Abstract
The aims were to examine the importance of regeneration by seeds, the
influence of plant traits and disturbances, and the role of seed-seedling
conflicts in regeneration and in the determination of vegetation structure.
The study was carried out at in a subarctic alpine area (Kilpisjärv...
Repository :
University of Oulu Repository - Jultika
Language(s) :
Undetermined