Sökning: "species reintroductions"
Hittade 4 avhandlingar innehållade orden species reintroductions.
1. Interaction strength and responses of ecological communities to disturbances
Sammanfattning : Ecological communities are continuously exposed to natural or anthropogenic disturbances of varied intensity and frequency. The way communities respond to disturbances can depend on various factors, such as number of species, structural characteristics of the community, stability properties, species characteristics and the nature of the disturbance. LÄS MER
2. Plant responses after drainage and restoration in rich fens
Sammanfattning : Rich fens are an important, but threatened, habitat type in the boreal landscape. In this thesis I have examined responses of rich fen vascular plants and bryophytes after drainage and restoration.The effects of drainage on the rich fen flora were observed in a long time study and the responses were rapid and drastic. LÄS MER
3. Behavioural aspects of conservation breeding : Red junglefowl (Gallus gallus) as a case study
Sammanfattning : Ett stort antal utrotningshotade djurarter ingår idag i bevarandeprogram världen över. Små populationer hålls då i skyddade miljöer, exempelvis i djurparker, och i många fall är målet att återintroducera djur till naturen. LÄS MER
4. Ecological and biogeochemical implications of the recovery of Eurasian beavers
Sammanfattning : In pre-industrial times beavers, ecosystem engineers, inhabited most of the Holarctic. Intensive exploitation over the last millennium, particularly in Europe during the 18th and 19th centuries, led to a dramatic decline in beaver populations. LÄS MER