Avancerad sökning

Visar resultat 1 - 5 av 25 avhandlingar som matchar ovanstående sökkriterier.

1. 1. Behavioural differences and genetic relationships between four captive populations of red junglefowl (Gallus gallus) : possible implications for conservation

   Författare :Jennie Håkansson; Linköpings universitet; []
   Nyckelord :Red junglefowl; behavioural differences; genetic relationships; captive populations; NATURAL SCIENCES; NATURVETENSKAP;

   Sammanfattning : Conservation of species is to a large extent carried out by zoos where animals are kept in small populations under protected conditions. The ultimate goal of such ex situ conservation programs is to eventually reintroduce the animals into natural habitats to provide support for the survival of the species. LÄS MER

3. 2. Habitat composition and restocking for conservation of the white-backed woodpecker in Sweden

   Författare :Kristoffer Stighäll; Per-Erik Olsson; Grzegorz Mikusinski; Örebro universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; White-backed woodpecker; Dendrocopos leucotos; Sweden; deciduous forest; suitable habitat; fragmentation; saproxylic insects; captive breeding; restocking; Biology; Biologi;

   Sammanfattning : In Sweden, intense human land use, especially forestry, has led to profound changes in the landscape over time, especially within the forest ecosystems. A consequence of this is that several specialist species have become endangered. One group of specialists is the woodpeckers. LÄS MER

4. 3. Behavioural aspects of conservation breeding : Red junglefowl (Gallus gallus) as a case study

   Författare :Jennie Håkansson; Per Jensen; Elsbeth McPhee; Linköpings universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Behaviour; Conservation; Red junglefowl; Gallus gallus; Captivity; Ethology and behavioural ecology; Etologi och beteendeekologi;

   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

5. 4. Role of oxidative stress and antioxidants in domestic and non-domestic cat spermatozoa : with special reference to cryopreservation

   Författare :Paweena Thuwanut; Sveriges lantbruksuniversitet; Sveriges lantbruksuniversitet; []
   Nyckelord :LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES;

   Sammanfattning : Living cells, including spermatozoa, stored under aerobic conditions require oxygen to support their normal metabolism. Excessive levels of metabolites (reactive oxygen species; ROS) can cause cell damage or lipid peroxidation. The ROS and lipid peroxidation can be detected during preparation and cryopreservation of mammalian spermatozoa. LÄS MER

7. 5. Fish coping with stress-Physiology and behaviour in salmonids with focus on stress coping styles, rearing conditions and smolt migration

   Författare :Malin Rosengren; Göteborgs universitet; []
   Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Behaviour; Conservation; Cortisol; Intestinal barrier function; Metabolism; Salmonids; Stress; Stress coping styles;

   Sammanfattning : When animals are reared for conservational releases it is paramount to avoid reducing genetic and phenotypic variation over time. Therefore, an understanding of how behavioural and physiological traits affect the performance of an individual both within the captive and the wild environment is required. LÄS MER