Search for dissertations about: "Cost of reproduction"

Showing result 1 - 5 of 45 swedish dissertations containing the words Cost of reproduction.

  1. 1. Physiological trade-offs in reproduction and condition dependence of a secondary sexual trait

    University dissertation from Uppsala : Acta Universitatis Upsaliensis

    Author : Måns S. Andersson; Victor Apanius; [2001]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Developmental biology; Trade-offs; life history; immune ecology; cost of reproduction; costs of immune response; sexual selection; migration; moult; Newcastle disease; HbA1C; Ficedula albicollis; Utvecklingsbiologi; NATURAL SCIENCES Biology Organism biology Developmental biology; NATURVETENSKAP Biologi Organismbiologi Utvecklingsbiologi; Animal Ecology; zooekologi;

    Abstract : This thesis examines parental condition, how it is traded off against reproduction and how it is displayed in a secondary sexual trait. The studies were performed on nest-box breeding collared flycatchers Ficedula albicollis on the island of Gotland, in the Baltic Sea. READ MORE

  2. 2. Experimental Evolution of Life-history Testing the Evolutionary Theories of Ageing

    University dissertation from Uppsala : Acta Universitatis Upsaliensis

    Author : Hwei-yen Chen; Alexei Maklakov; Tracey Chapman; [2014]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; senescence; ageing; longevity; mortality; experimental evolution; Caenorhabditis remanei; Biologi; Biology;

    Abstract : Ageing reduces fitness, but how ageing evolves is still unclear. Evolutionary theory of ageing hinges on the fundamental principal that the force of natural selection declines with age. READ MORE

  3. 3. On starlings and farming: population decline, foraging strategies, cost of reproduction and breeding success

    University dissertation from Måns Bruun, Departmen of Ecology, Animal Ecology, The Ecology Building S-223 62 Lund, Sweden

    Author : Måns Bruun; [2002]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; breeding success; foraging strategies; intensification; agricultural methods; population decline; farmland bird; cost of reproduction; Animal ecology; Djurekologi;

    Abstract : The European Starling Sturnus vulgaris as many other farmland bird species has been declining during the last decades. The cause of these declines is generally believed to be changes with in agricultural methods affecting breeding and survival of birds. READ MORE

  4. 4. Causes and consequences of blood parasite infections in birds

    University dissertation from Martin Stjernman, Ecology building, S-223 62, Lund, Sweden

    Author : Martin Stjernman; [2004]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Animal physiology; Djurfysiologi; Parasitologi människa och djur ; Parasitology human and animal ; maternal transfer; stabilising selection; parasite resistance; parasites; trade-off; cost of reproduction; Ficedula hypoleuca; pied flycatcher; Haemoproteus; blue tit; Parus caeruleus;

    Abstract : Parasites are ubiquitous and can cause significant fitness reductions to their hosts. Therefore, selection for the evolution of host resistance should be strong. However, resistance may be costly and should be traded-off against other fitness related traits. READ MORE

  5. 5. Priority setting strategies for regulatory testing of industrial chemicals

    University dissertation from Stockholm : KTH

    Author : Anna Nordberg; Christina Rudén; Sven Ove Hansson; Nils Gunnar Lindquist; [2007]
    Keywords : HUMANIORA; HUMANITIES; risk assessment; risk management; regulatory toxicology; test strategies; prioritisation; REACH; industrial chemicals; HUMANITIES and RELIGION History and philosophy subjects History subjects History of technology and industry; HUMANIORA och RELIGIONSVETENSKAP Historisk-filosofiska ämnen Historieämnen Teknik- och industrihistoria;

    Abstract : For the majority of the estimated 70,000 industrial chemical substances available on the European market today there is not enough information to enable a reasonably complete assessment of the risks that they might pose to man and the environment. Any strategy for the generation of additional data for these substances should aim at making testing as efficient as possible taking into account environmental and health protection, time, monetary cost and animal welfare. READ MORE